GLib – 2.0

deprecated: 2.10 

Contains the public fields of a GArray.

An opaque data structure which represents an asynchronous queue.

GBookmarkFile lets you parse, edit or create files containing bookmarks.

since: 2.12

Contains the public fields of a GByteArray.

A simple reference counted data type representing an immutable sequence of zero or more bytes from an unspecified origin.

since: 2.32

A GCache allows sharing of complex data structures, in order to save system resources.

deprecated: 2.32 

GLib provides a generic API for computing checksums (or ‘digests’) for a sequence of arbitrary bytes, using various hashing algorithms like MD5, SHA-1 and SHA-256. Checksums are commonly used in various environments and specifications.

since: 2.16

GCompletion provides support for automatic completion of a string using any group of target strings. It is typically used for file name completion as is common in many UNIX shells.

deprecated: 2.26 

The GCond struct is an opaque data structure that represents a condition. Threads can block on a GCond if they find a certain condition to be false. If other threads change the state of this condition they signal the GCond, and that causes the waiting threads to be woken up.

An opaque data structure that represents a keyed data list.

GDate is a struct for calendrical calculations.

GDateTime is a structure that combines a Gregorian date and time into a single structure.

since: 2.26

Associates a string with a bit flag. Used in g_parse_debug_string().

An opaque structure representing an opened directory.

The GError structure contains information about an error that has occurred.

The GHashTable struct is an opaque data structure to represent a Hash Table. It should only be accessed via the following functions.

A GHashTableIter structure represents an iterator that can be used to iterate over the elements of a GHashTable. GHashTableIter structures are typically allocated on the stack and then initialized with g_hash_table_iter_init().

HMACs should be used when producing a cookie or hash based on data and a key. Simple mechanisms for using SHA1 and other algorithms to digest a key and data together are vulnerable to various security issues. HMAC uses algorithms like SHA1 in a secure way to produce a digest of a key and data.

since: 2.30

The GHook struct represents a single hook function in a GHookList.

The GHookList struct represents a list of hook functions.

The GIConv struct wraps an iconv() conversion descriptor. It contains private data and should only be accessed using the following functions.

The GIOChannel data type aims to provide a portable method for using file descriptors, pipes, and sockets, and integrating them into the main event loop (see GMainContext). Currently, full support is available on UNIX platforms; support for Windows is only partially complete.

A table of functions used to handle different types of GIOChannel in a generic way.

GKeyFile parses .ini-like config files.

The GList struct is used for each element in a doubly-linked list.

Structure representing a single field in a structured log entry. See g_log_structured() for details.

since: 2.50

The GMainContext struct is an opaque data type representing a set of sources to be handled in a main loop.

The GMainLoop struct is an opaque data type representing the main event loop of a GLib or GTK application.

The GMappedFile represents a file mapping created with g_mapped_file_new(). It has only private members and should not be accessed directly.

A parse context is used to parse a stream of bytes that you expect to contain marked-up text.

Any of the fields in GMarkupParser can be NULL, in which case they will be ignored. Except for the error function, any of these callbacks can set an error; in particular the G_MARKUP_ERROR_UNKNOWN_ELEMENT, G_MARKUP_ERROR_UNKNOWN_ATTRIBUTE, and G_MARKUP_ERROR_INVALID_CONTENT errors are intended to be set from these callbacks. If you set an error from a callback, g_markup_parse_context_parse() will report that error back to its caller.

A GMatchInfo is an opaque struct used to return information about matches.

deprecated: 2.10 

A set of functions used to perform memory allocation. The same GMemVTable must be used for all allocations in the same program; a call to g_mem_set_vtable(), if it exists, should be prior to any use of GLib.

The GNode struct represents one node in a n-ary tree.

A GOnce struct controls a one-time initialization function. Any one-time initialization function must have its own unique GOnce struct.

since: 2.4

A GOptionContext struct defines which options are accepted by the commandline option parser. The struct has only private fields and should not be directly accessed.

• G_OPTION_ARG_NONE: %gboolean
  • G_OPTION_ARG_STRING: %gchar*
  • G_OPTION_ARG_INT: %gint
  • G_OPTION_ARG_FILENAME: %gchar*
  • G_OPTION_ARG_STRING_ARRAY: %gchar**
  • G_OPTION_ARG_FILENAME_ARRAY: %gchar**
  • G_OPTION_ARG_DOUBLE: %gdouble.

A GOptionGroup struct defines the options in a single group. The struct has only private fields and should not be directly accessed.

GPathBuf is a helper type that allows you to easily build paths from individual elements, using the platform specific conventions for path separators.

since: 2.76

A GPatternSpec struct is the ‘compiled’ form of a glob-style pattern.

Represents a file descriptor, which events to poll for, and which events occurred.

The GPrivate struct is an opaque data structure to represent a thread-local data key. It is approximately equivalent to the pthread_setspecific()/pthread_getspecific() APIs on POSIX and to TlsSetValue()/TlsGetValue() on Windows.

Contains the public fields of a pointer array.

Contains the public fields of a Queue.

The GRand struct is an opaque data structure. It should only be accessed through the g_rand_* functions.

The GRecMutex struct is an opaque data structure to represent a recursive mutex. It is similar to a GMutex with the difference that it is possible to lock a GRecMutex multiple times in the same thread without deadlock. When doing so, care has to be taken to unlock the recursive mutex as often as it has been locked.

since: 2.32

A GRegex is the “compiled” form of a regular expression pattern.

since: 2.14

A GRelation is a table of data which can be indexed on any number of fields, rather like simple database tables. A GRelation contains a number of records, called tuples. Each record contains a number of fields. Records are not ordered, so it is not possible to find the record at a particular index.

deprecated: 2.26 

The GRWLock struct is an opaque data structure to represent a reader-writer lock. It is similar to a GMutex in that it allows multiple threads to coordinate access to a shared resource.

since: 2.32

GScanner provides a general-purpose lexical scanner.

Specifies the GScanner parser configuration. Most settings can be changed during the parsing phase and will affect the lexical parsing of the next unpeeked token.

The GSequence struct is an opaque data type representing a sequence data type.

The GSequenceIter struct is an opaque data type representing an iterator pointing into a GSequence.

The GSList struct is used for each element in the singly-linked list.

The GSource struct is an opaque data type representing an event source.

The GSourceCallbackFuncs struct contains functions for managing callback objects.

The GSourceFuncs struct contains a table of functions used to handle event sources in a generic manner.

A type corresponding to the appropriate struct type for the stat() system call, depending on the platform and/or compiler being used.

A GStaticMutex works like a GMutex.

A GStaticPrivate works almost like a GPrivate, but it has one significant advantage. It doesn’t need to be created at run-time like a GPrivate, but can be defined at compile-time. This is similar to the difference between GMutex and GStaticMutex.

A GStaticRecMutex works like a GStaticMutex, but it can be locked multiple times by one thread. If you enter it n times, you have to unlock it n times again to let other threads lock it. An exception is the function g_static_rec_mutex_unlock_full(): that allows you to unlock a GStaticRecMutex completely returning the depth, (i.e. the number of times this mutex was locked). The depth can later be used to restore the state of the GStaticRecMutex by calling g_static_rec_mutex_lock_full(). In GLib 2.32, GStaticRecMutex has been deprecated in favor of GRecMutex.

The GStaticRWLock struct represents a read-write lock. A read-write lock can be used for protecting data that some portions of code only read from, while others also write. In such situations it is desirable that several readers can read at once, whereas of course only one writer may write at a time.

deprecated: 2.32 

A GString is an object that handles the memory management of a C string.

GStringChunk provides efficient storage of groups of strings.

GStrvBuilder is a helper object to build a NULL-terminated string arrays.

since: 2.68

An opaque structure representing a test case.

An opaque structure representing a test suite.

The GThread struct represents a running thread. This struct is returned by g_thread_new() or g_thread_try_new(). You can obtain the GThread struct representing the current thread by calling g_thread_self().

This function table is no longer used by g_thread_init() to initialize the thread system.

The GThreadPool struct represents a thread pool.

GTimer records a start time, and counts microseconds elapsed since that time.

Represents a precise time, with seconds and microseconds.

deprecated: 2.62 

A GTimeZone represents a time zone, at no particular point in time.

since: 2.26

A GTrashStack is an efficient way to keep a stack of unused allocated memory chunks. Each memory chunk is required to be large enough to hold a gpointer. This allows the stack to be maintained without any space overhead, since the stack pointers can be stored inside the memory chunks.

deprecated: 2.48 

The GTree struct is an opaque data structure representing a balanced binary tree. It should be accessed only by using the following functions.

An opaque type which identifies a specific node in a GTree.

since: 2.68

The GTuples struct is used to return records (or tuples) from the GRelation by g_relation_select(). It only contains one public member - the number of records that matched. To access the matched records, you must use g_tuples_index().

deprecated: 2.26 

The GUri type and related functions can be used to parse URIs into their components, and build valid URIs from individual components.

since: 2.66

Many URI schemes include one or more attribute/value pairs as part of the URI value. For example scheme://server/path?query=string&is=there has two attributes – query=string and is=there – in its query part.

since: 2.66

GVariant is a variant datatype; it can contain one or more values along with information about the type of the values.

since: 2.24

A utility type for constructing container-type GVariant instances.

GVariantDict is a mutable interface to GVariant dictionaries.

since: 2.40

GVariantIter is an opaque data structure and can only be accessed using the following functions.

A type in the GVariant type system.

since: 2.24

The GFloatIEEE754 and GDoubleIEEE754 unions are used to access the sign, mantissa and exponent of IEEE floats and doubles. These unions are defined as appropriate for a given platform. IEEE floats and doubles are supported (used for storage) by at least Intel, PPC and Sparc.

The GFloatIEEE754 and GDoubleIEEE754 unions are used to access the sign, mantissa and exponent of IEEE floats and doubles. These unions are defined as appropriate for a given platform. IEEE floats and doubles are supported (used for storage) by at least Intel, PPC and Sparc.

The GMutex struct is an opaque data structure to represent a mutex (mutual exclusion). It can be used to protect data against shared access.

A union holding the value of the token.

Integer representing a day of the month; between 1 and 31.

Integer type representing a year.

Opaque type. See g_main_context_pusher_new() for details.

Opaque type. See g_mutex_locker_new() for details.

A type which is used to hold a process identification.

A GQuark is a non-zero integer which uniquely identifies a particular string.

Opaque type. See g_rec_mutex_locker_new() for details.

A typedef for a reference-counted string. A pointer to a GRefString can be treated like a standard char* array by all code, but can additionally have g_ref_string_*() methods called on it. g_ref_string_*() methods cannot be called on char* arrays not allocated using g_ref_string_new().

Opaque type. See g_rw_lock_reader_locker_new() for details.

Opaque type. See g_rw_lock_writer_locker_new() for details.

A typedef alias for gchar**. This is mostly useful when used together with g_auto().

Simply a replacement for time_t. It has been deprecated since it is not equivalent to time_t on 64-bit platforms with a 64-bit time_t.

deprecated: 2.62 

A value representing an interval of time, in microseconds.

The hashing algorithm to be used by GChecksum when performing the digest of some data.

since: 2.16

This enumeration isn’t used in the API, but may be useful if you need to mark a number as a day, month, or year.

Enumeration representing a month; values are G_DATE_JANUARY, G_DATE_FEBRUARY, etc. G_DATE_BAD_MONTH is the invalid value.

Enumeration representing a day of the week; G_DATE_MONDAY, G_DATE_TUESDAY, etc. G_DATE_BAD_WEEKDAY is an invalid weekday.

The possible errors, used in the v_error field of GTokenValue, when the token is a G_TOKEN_ERROR.

GIOError is only used by the deprecated functions g_io_channel_read(), g_io_channel_write(), and g_io_channel_seek().

Statuses returned by most of the GIOFuncs functions.

Return values from GLogWriterFuncs to indicate whether the given log entry was successfully handled by the writer, or whether there was an error in handling it (and hence a fallback writer should be used).

since: 2.50

Defines how a Unicode string is transformed in a canonical form, standardizing such issues as whether a character with an accent is represented as a base character and combining accent or as a single precomposed character. Unicode strings should generally be normalized before comparing them.

The possible statuses of a one-time initialization function controlled by a GOnce struct.

since: 2.4

The GOptionArg enum values determine which type of extra argument the options expect to find. If an option expects an extra argument, it can be specified in several ways; with a short option: -x arg, with a long option: --name arg or combined in a single argument: --name=arg.

An enumeration specifying the base position for a g_io_channel_seek_position() operation.

The type of file to return the filename for, when used with g_test_build_filename().

since: 2.38

Thread priorities.

deprecated: 2.32 

Disambiguates a given time in two ways.

The possible types of token returned from each g_scanner_get_next_token() call.

Specifies the type of traversal performed by g_tree_traverse(), g_node_traverse() and g_node_find().

These are the possible line break classifications.

The GUnicodeScript enumeration identifies different writing systems. The values correspond to the names as defined in the Unicode standard. The enumeration has been added in GLib 2.14, and is interchangeable with PangoScript.

These are the possible character classifications from the Unicode specification. See Unicode Character Database.

These are logical ids for special directories which are defined depending on the platform used. You should use g_get_user_special_dir() to retrieve the full path associated to the logical id.

since: 2.14

The range of possible top-level types of GVariant instances.

since: 2.24

Flags to pass to g_file_set_contents_full() to affect its safety and performance.

since: 2.66

A test to perform on a file using g_file_test().

Flags to modify the format of the string returned by g_format_size_full().

Flags used internally in the GHook implementation.

A bitwise combination representing a condition to watch for on an event source.

Specifies properties of a GIOChannel. Some of the flags can only be read with g_io_channel_get_flags(), but not changed with g_io_channel_set_flags().

Flags which influence the parsing.

Flags specifying the level of log messages.

Flags to pass to g_main_context_new_with_flags() which affect the behaviour of a GMainContext.

since: 2.72

A mixed enumerated type and flags field. You must specify one type (string, strdup, boolean, tristate). Additionally, you may optionally bitwise OR the type with the flag G_MARKUP_COLLECT_OPTIONAL.

Flags that affect the behaviour of the parser.

Flags which modify individual options.

Flags specifying compile-time options.

since: 2.14

Flags specifying match-time options.

since: 2.14

Flags passed to g_spawn_sync(), g_spawn_async() and g_spawn_async_with_pipes().

Flags to pass to g_test_trap_subprocess() to control input and output.

Flags to pass to g_test_trap_fork() to control input and output.

deprecated: 2.38 

Specifies which nodes are visited during several of the tree functions, including g_node_traverse() and g_node_find().

Flags that describe a URI.

since: 2.66

Flags describing what parts of the URI to hide in g_uri_to_string_partial(). Note that G_URI_HIDE_PASSWORD and G_URI_HIDE_AUTH_PARAMS will only work if the GUri was parsed with the corresponding flags.

since: 2.66

Flags modifying the way parameters are handled by g_uri_parse_params() and GUriParamsIter.

since: 2.66

Error codes returned by bookmark file parsing.

Error codes returned by character set conversion routines.

Values corresponding to errno codes returned from file operations on UNIX. Unlike errno codes, GFileError values are available on all systems, even Windows. The exact meaning of each code depends on what sort of file operation you were performing; the UNIX documentation gives more details. The following error code descriptions come from the GNU C Library manual, and are under the copyright of that manual.

Error codes returned by GIOChannel operations.

Error codes returned by key file parsing.

Error codes returned by markup parsing.

Error codes returned by functions converting a string to a number.

since: 2.54

Error codes returned by option parsing.

Error codes returned by regular expressions functions.

since: 2.14

Error codes returned by shell functions.

Error codes returned by spawning processes.

Possible errors of thread related functions.

Error codes returned by GUri methods.

since: 2.66

Error codes returned by parsing text-format GVariants.

Specifies the type of the value_destroy_func and key_destroy_func functions passed to g_cache_new(). The functions are passed a pointer to the GCache key or GCache value and should free any memory and other resources associated with it.

deprecated: 2.32 

Specifies the type of the key_dup_func function passed to g_cache_new(). The function is passed a key (not a value as the prototype implies) and should return a duplicate of the key.

deprecated: 2.32 

Specifies the type of the value_new_func function passed to g_cache_new(). It is passed a GCache key and should create the value corresponding to the key.

deprecated: 2.32 

Prototype of a GChildWatchSource callback, called when a child process has exited.

Specifies the type of function passed to g_clear_handle_id() The implementation is expected to free the resource identified by handle_id; for instance, if handle_id is a GSource ID, g_source_remove() can be used.

since: 2.56

Specifies the type of a comparison function used to compare two values. The function should return a negative integer if the first value comes before the second, 0 if they are equal, or a positive integer if the first value comes after the second.

Specifies the type of a comparison function used to compare two values. The function should return a negative integer if the first value comes before the second, 0 if they are equal, or a positive integer if the first value comes after the second.

Specifies the type of the function passed to g_completion_new(). It should return the string corresponding to the given target item. This is used when you use data structures as GCompletion items.

deprecated: 2.26 

Specifies the type of the function passed to g_completion_set_compare(). This is used when you use strings as GCompletion items.

deprecated: 2.26 

A function of this signature is used to copy the node data when doing a deep-copy of a tree.

since: 2.4

Specifies the type of function passed to g_dataset_foreach(). It is called with each GQuark id and associated data element, together with the user_data parameter supplied to g_dataset_foreach().

Specifies the type of function which is called when a data element is destroyed. It is passed the pointer to the data element and should free any memory and resources allocated for it.

The type of functions that are used to ‘duplicate’ an object. What this means depends on the context, it could just be incrementing the reference count, if data is a ref-counted object.

Specifies the type of a function used to test two values for equality. The function should return TRUE if both values are equal and FALSE otherwise.

Specifies the type of a function used to test two values for equality. The function should return TRUE if both values are equal and FALSE otherwise.

since: 2.74

Specifies the type of function which is called when an extended error instance is freed. It is passed the error pointer about to be freed, and should free the error’s private data fields.

since: 2.68

Specifies the type of function which is called when an extended error instance is copied. It is passed the pointer to the destination error and source error, and should copy only the fields of the private data from src_error to dest_error.

since: 2.68

Specifies the type of function which is called just after an extended error instance is created and its fields filled. It should only initialize the fields in the private data, which can be received with the generated *_get_private() function.

since: 2.68

Declares a type of function which takes an arbitrary data pointer argument and has no return value. It is not currently used in GLib or GTK.

Specifies the type of functions passed to g_list_foreach() and g_slist_foreach().

Specifies the type of the hash function which is passed to g_hash_table_new() when a GHashTable is created.

Specifies the type of the function passed to g_hash_table_foreach(). It is called with each key/value pair, together with the user_data parameter which is passed to g_hash_table_foreach().

Defines the type of a hook function that can be invoked by g_hook_list_invoke_check().

Defines the type of function used by g_hook_list_marshal_check().

Defines the type of function used to compare GHook elements in g_hook_insert_sorted().

Defines the type of function to be called when a hook in a list of hooks gets finalized.

Defines the type of the function passed to g_hook_find().

Defines the type of a hook function that can be invoked by g_hook_list_invoke().

Defines the type of function used by g_hook_list_marshal().

Specifies the type of the function passed to g_hash_table_find(), g_hash_table_foreach_remove(), and g_hash_table_foreach_steal().

Specifies the type of function passed to g_io_add_watch() or g_io_add_watch_full(), which is called when the requested condition on a GIOChannel is satisfied.

Specifies the prototype of log handler functions.

Writer function for log entries. A log entry is a collection of one or more GLogFields, using the standard field names from journal specification. See g_log_structured() for more information.

since: 2.50

Specifies the type of function passed to g_node_children_foreach(). The function is called with each child node, together with the user data passed to g_node_children_foreach().

Specifies the type of function passed to g_node_traverse(). The function is called with each of the nodes visited, together with the user data passed to g_node_traverse(). If the function returns TRUE, then the traversal is stopped.

The type of function to be passed as callback for G_OPTION_ARG_CALLBACK options.

The type of function to be used as callback when a parse error occurs.

The type of function that can be called before and after parsing.

Specifies the type of function passed to g_main_context_set_poll_func(). The semantics of the function should match those of the poll() system call.

Specifies the type of the print handler functions. These are called with the complete formatted string to output.

Specifies the type of the function passed to g_regex_replace_eval(). It is called for each occurrence of the pattern in the string passed to g_regex_replace_eval(), and it should append the replacement to result.

since: 2.14

Specifies the type of the message handler function.

A GSequenceIterCompareFunc is a function used to compare iterators. It must return zero if the iterators compare equal, a negative value if a comes before b, and a positive value if b comes before a.

Dispose function for source. See g_source_set_dispose_function() for details.

since: 2.64

This is just a placeholder for GClosureMarshal, which cannot be used here for dependency reasons.

Specifies the type of function passed to g_timeout_add(), g_timeout_add_full(), g_idle_add(), and g_idle_add_full().

Checks if the source is ready to be dispatched.

since: 2.82

Dispatches the source callback.

since: 2.82

Finalizes the source.

since: 2.82

Checks the source for readiness.

since: 2.82

A source function that is only called once before being removed from the main context automatically.

since: 2.74

Specifies the type of the setup function passed to g_spawn_async(), g_spawn_sync() and g_spawn_async_with_pipes(), which can, in very limited ways, be used to affect the child’s execution.

The type used for test case functions that take an extra pointer argument.

since: 2.28

The type used for functions that operate on test fixtures.

since: 2.28

The type used for test case functions.

since: 2.28

Specifies the prototype of fatal log handler functions.

since: 2.22

Specifies the type of the func functions passed to g_thread_new() or g_thread_try_new().

The type of functions which are used to translate user-visible strings, for —help output.

Specifies the type of function passed to g_tree_traverse(). It is passed the key and value of each node, together with the user_data parameter passed to g_tree_traverse(). If the function returns TRUE, the traversal is stopped.

Specifies the type of function passed to g_tree_foreach_node(). It is passed each node, together with the user_data parameter passed to g_tree_foreach_node(). If the function returns TRUE, the traversal is stopped.

since: 2.68

Declares a type of function which takes no arguments and has no return value. It is used to specify the type function passed to g_atexit().

A wrapper for the POSIX access() function. This function is used to test a pathname for one or several of read, write or execute permissions, or just existence.

since: 2.8

This function is similar to g_malloc(), allocating (n_blocks * n_block_bytes) bytes, but care is taken to align the allocated memory to with the given alignment value. Additionally, it will detect possible overflow during multiplication.

since: 2.72

This function is similar to g_aligned_alloc(), but it will also clear the allocated memory before returning it.

since: 2.72

Frees the memory allocated by g_aligned_alloc().

since: 2.72

Frees the memory pointed to by mem, assuming it is has the given size and alignment.

since: 2.76

Determines the numeric value of a character as a decimal digit. If the character is not a decimal digit according to g_ascii_isdigit(), -1 is returned.

Converts a gdouble to a string, using the ‘.’ as decimal point.

Converts a gdouble to a string, using the ‘.’ as decimal point. To format the number you pass in a printf()-style format string. Allowed conversion specifiers are ‘e’, ‘E’, ‘f’, ‘F’, ‘g’ and ‘G’.

Compare two strings, ignoring the case of ASCII characters.

Converts all upper case ASCII letters to lower case ASCII letters, with semantics that exactly match g_ascii_tolower().

A convenience function for converting a string to a signed number.

since: 2.54

A convenience function for converting a string to an unsigned number.

since: 2.54

Compare s1 and s2, ignoring the case of ASCII characters and any characters after the first n in each string. If either string is less than n bytes long, comparison will stop at the first nul byte encountered.

Converts a string to a floating point value.

Converts a string to a gint64 value.

since: 2.12

Converts a string to a guint64 value.

since: 2.2

Converts all lower case ASCII letters to upper case ASCII letters, with semantics that exactly match g_ascii_toupper().

Convert a character to ASCII lower case. If the character is not an ASCII upper case letter, it is returned unchanged.

Convert a character to ASCII upper case. If the character is not an ASCII lower case letter, it is returned unchanged.

Determines the numeric value of a character as a hexadecimal digit. If the character is not a hex digit according to g_ascii_isxdigit(), -1 is returned.

Internal function used to print messages from the public g_assert() and g_assert_not_reached() macros.

Specifies a function to be called at normal program termination.

deprecated: 2.32 

Atomically adds val to the value of atomic.

since: 2.4

Performs an atomic bitwise ‘and’ of the value of atomic and val, storing the result back in atomic.

since: 2.30

Compares atomic to oldval and, if equal, sets it to newval. If atomic was not equal to oldval then no change occurs.

since: 2.4

Compares atomic to oldval and, if equal, sets it to newval. If atomic was not equal to oldval then no change occurs. In any case the value of atomic before this operation is stored in preval.

since: 2.74

Decrements the value of atomic by 1.

since: 2.4

Sets the atomic to newval and returns the old value from atomic.

since: 2.74

This function existed before g_atomic_int_add() returned the prior value of the integer (which it now does). It is retained only for compatibility reasons. Don’t use this function in new code.

deprecated: 2.30 since: 2.4

Gets the current value of atomic.

since: 2.4

Increments the value of atomic by 1.

since: 2.4

Performs an atomic bitwise ‘or’ of the value of atomic and val, storing the result back in atomic.

since: 2.30

Sets the value of atomic to newval.

since: 2.4

Performs an atomic bitwise ‘xor’ of the value of atomic and val, storing the result back in atomic.

since: 2.30

Atomically adds val to the value of atomic.

since: 2.30

Performs an atomic bitwise ‘and’ of the value of atomic and val, storing the result back in atomic.

since: 2.30

Compares atomic to oldval and, if equal, sets it to newval. If atomic was not equal to oldval then no change occurs.

since: 2.4

Compares atomic to oldval and, if equal, sets it to newval. If atomic was not equal to oldval then no change occurs. In any case the value of atomic before this operation is stored in preval.

since: 2.74

Sets the atomic to newval and returns the old value from atomic.

since: 2.74

Gets the current value of atomic.

since: 2.4

Performs an atomic bitwise ‘or’ of the value of atomic and val, storing the result back in atomic.

since: 2.30

Sets the value of atomic to newval.

since: 2.4

Performs an atomic bitwise ‘xor’ of the value of atomic and val, storing the result back in atomic.

since: 2.30

Atomically acquires a reference on the data pointed by mem_block.

since: 2.58

Allocates block_size bytes of memory, and adds atomic reference counting semantics to it.

since: 2.58

Allocates block_size bytes of memory, and adds atomic reference counting semantics to it.

since: 2.58

Allocates a new block of data with atomic reference counting semantics, and copies block_size bytes of mem_block into it.

since: 2.58

Retrieves the size of the reference counted data pointed by mem_block.

since: 2.58

Atomically releases a reference on the data pointed by mem_block.

since: 2.58

Atomically releases a reference on the data pointed by mem_block.

since: 2.58

Atomically compares the current value of arc with val.

since: 2.58

Atomically decreases the reference count.

since: 2.58

Atomically increases the reference count.

since: 2.58

Initializes a reference count variable to 1.

since: 2.58

Decode a sequence of Base-64 encoded text into binary data. Note that the returned binary data is not necessarily zero-terminated, so it should not be used as a character string.

since: 2.12

Decode a sequence of Base-64 encoded text into binary data by overwriting the input data.

since: 2.20

Incrementally decode a sequence of binary data from its Base-64 stringified representation. By calling this function multiple times you can convert data in chunks to avoid having to have the full encoded data in memory.

since: 2.12

Encode a sequence of binary data into its Base-64 stringified representation.

since: 2.12

Flush the status from a sequence of calls to g_base64_encode_step().

since: 2.12

Incrementally encode a sequence of binary data into its Base-64 stringified representation. By calling this function multiple times you can convert data in chunks to avoid having to have the full encoded data in memory.

since: 2.12

Gets the name of the file without any leading directory components. It returns a pointer into the given file name string.

deprecated: 2.2 

Sets the indicated lock_bit in address. If the bit is already set, this call will block until g_bit_unlock() unsets the corresponding bit.

since: 2.24

Sets the indicated lock_bit in address and atomically returns the new value.

unstable since: 2.86

Find the position of the first bit set in mask, searching from (but not including) nth_bit upwards. Bits are numbered from 0 (least significant) to sizeof(#gulong) * 8 - 1 (31 or 63, usually). To start searching from the 0th bit, set nth_bit to -1.

Find the position of the first bit set in mask, searching from (but not including) nth_bit downwards. Bits are numbered from 0 (least significant) to sizeof(#gulong) * 8 - 1 (31 or 63, usually). To start searching from the last bit, set nth_bit to -1 or GLIB_SIZEOF_LONG * 8.

Gets the number of bits used to hold number, e.g. if number is 4, 3 bits are needed.

Sets the indicated lock_bit in address, returning TRUE if successful. If the bit is already set, returns FALSE immediately.

since: 2.24

Clears the indicated lock_bit in address. If another thread is currently blocked in g_bit_lock() on this same bit then it will be woken up.

since: 2.24

This is like g_bit_unlock()() but also atomically sets address to val.

unstable since: 2.86

deprecated: 2.10 

Creates a filename from a series of elements using the correct separator for the current platform.

Creates a filename from a list of elements using the correct separator for the current platform.

since: 2.56

Creates a filename from a vector of elements using the correct separator for the current platform.

since: 2.8

Creates a path from a series of elements using separator as the separator between elements.

Behaves exactly like g_build_path(), but takes the path elements as a string array, instead of variadic arguments.

since: 2.8

Gets the canonical file name from filename. All triple slashes are turned into single slashes, and all .. and .s resolved against relative_to.

since: 2.58

A wrapper for the POSIX chdir() function. The function changes the current directory of the process to path.

since: 2.8

Checks that the GLib library in use is compatible with the given version.

since: 2.6

Sets a function to be called when the child indicated by pid exits, at a default priority, G_PRIORITY_DEFAULT.

since: 2.4

Sets a function to be called when the child indicated by pid exits, at the priority priority.

since: 2.4

Creates a new child_watch source.

since: 2.4

A wrapper for the POSIX chmod() function. The chmod() function is used to set the permissions of a file system object.

since: 2.8

If err or *err is NULL, does nothing. Otherwise, calls g_error_free() on *err and sets *err to NULL.

If fd_ptr points to a file descriptor, close it and return whether closing it was successful, like g_close(). If fd_ptr points to a negative number, return TRUE without closing anything. In both cases, set fd_ptr to -1 before returning.

since: 2.76

Clears a numeric handler, such as a GSource ID.

since: 2.56

Clears a pointer to a GList, freeing it and, optionally, freeing its elements using destroy.

since: 2.64

Clears a reference to a variable.

since: 2.34

Clears a pointer to a GSList, freeing it and, optionally, freeing its elements using destroy.

since: 2.64

This wraps the close() call. In case of error, %errno will be preserved, but the error will also be stored as a GError in error. In case of success, %errno is undefined.

since: 2.36

Close every file descriptor equal to or greater than lowfd.

since: 2.80

Computes the checksum for a binary data. This is a convenience wrapper for g_checksum_new(), g_checksum_get_string() and g_checksum_free().

since: 2.34

Computes the checksum for a binary data of length. This is a convenience wrapper for g_checksum_new(), g_checksum_get_string() and g_checksum_free().

since: 2.16

Computes the checksum of a string.

since: 2.16

Computes the HMAC for a binary data. This is a convenience wrapper for g_hmac_new(), g_hmac_get_string() and g_hmac_unref().

since: 2.50

Computes the HMAC for a binary data of length. This is a convenience wrapper for g_hmac_new(), g_hmac_get_string() and g_hmac_unref().

since: 2.30

Computes the HMAC for a string.

since: 2.30

Converts a string from one character set to another.

Converts a string from one character set to another, possibly including fallback sequences for characters not representable in the output. Note that it is not guaranteed that the specification for the fallback sequences in fallback will be honored. Some systems may do an approximate conversion from from_codeset to to_codeset in their iconv() functions, in which case GLib will simply return that approximate conversion.

Converts a string from one character set to another.

A wrapper for the POSIX creat() function. The creat() function is used to convert a pathname into a file descriptor, creating a file if necessary.

since: 2.8

Frees all the data elements of the datalist. The data elements’ destroy functions are called if they have been set.

Calls the given function for each data element of the datalist. The function is called with each data element’s GQuark id and data, together with the given user_data parameter. Note that this function is NOT thread-safe. So unless datalist can be protected from any modifications during invocation of this function, it should not be called.

Gets a data element, using its string identifier. This is slower than g_datalist_id_get_data() because it compares strings.

Gets flags values packed in together with the datalist. See g_datalist_set_flags().

since: 2.8

This is a variant of g_datalist_id_get_data() which returns a ‘duplicate’ of the value. dup_func defines the meaning of ‘duplicate’ in this context, it could e.g. take a reference on a ref-counted object.

since: 2.34

Retrieves the data element corresponding to key_id.

Removes multiple keys from a datalist.

since: 2.74

Removes an element, without calling its destroy notification function.

Compares the member that is associated with key_id in datalist to oldval, and if they are the same, replace oldval with newval.

since: 2.34

Sets the data corresponding to the given GQuark id, and the function to be called when the element is removed from the datalist. Any previous data with the same key is removed, and its destroy function is called.

Resets the datalist to NULL. It does not free any memory or call any destroy functions.

Turns on flag values for a data list. This function is used to keep a small number of boolean flags in an object with a data list without using any additional space. It is not generally useful except in circumstances where space is very tight. (It is used in the base GObject type, for example.).

since: 2.8

Turns off flag values for a data list. See g_datalist_unset_flags().

since: 2.8

Destroys the dataset, freeing all memory allocated, and calling any destroy functions set for data elements.

Calls the given function for each data element which is associated with the given location. Note that this function is NOT thread-safe. So unless dataset_location can be protected from any modifications during invocation of this function, it should not be called.

Gets the data element corresponding to a GQuark.

Removes an element, without calling its destroy notification function.

Sets the data element associated with the given GQuark id, and also the function to call when the data element is destroyed. Any previous data with the same key is removed, and its destroy function is called.

This is a variant of g_dgettext() that allows specifying a locale category instead of always using LC_MESSAGES. See g_dgettext() for more information about how this functions differs from calling dcgettext() directly.

since: 2.26

This function is a wrapper of dgettext() which does not translate the message if the default domain as set with textdomain() has no translations for the current locale.

since: 2.18

Compares two #gpointer arguments and returns TRUE if they are equal. It can be passed to g_hash_table_new() as the key_equal_func parameter, when using opaque pointers compared by pointer value as keys in a GHashTable.

Converts a gpointer to a hash value. It can be passed to g_hash_table_new() as the hash_func parameter, when using opaque pointers compared by pointer value as keys in a GHashTable.

This function is a wrapper of dngettext() which does not translate the message if the default domain as set with textdomain() has no translations for the current locale.

since: 2.18

Compares the two #gdouble values being pointed to and returns TRUE if they are equal. It can be passed to g_hash_table_new() as the key_equal_func parameter, when using non-NULL pointers to doubles as keys in a GHashTable.

since: 2.22

Converts a pointer to a #gdouble to a hash value. It can be passed to g_hash_table_new() as the hash_func parameter, It can be passed to g_hash_table_new() as the hash_func parameter, when using non-NULL pointers to doubles as keys in a GHashTable.

since: 2.22

This function is a variant of g_dgettext() which supports a disambiguating message context. GNU gettext uses the ‘\004’ character to separate the message context and message id in msgctxtid. If 0 is passed as msgidoffset, this function will fall back to trying to use the deprecated convention of using “|” as a separation character.

since: 2.16

This function is a variant of g_dgettext() which supports a disambiguating message context. GNU gettext uses the ‘\004’ character to separate the message context and message id in msgctxtid.

since: 2.18

Returns the value of the environment variable variable in the provided list envp.

since: 2.32

Sets the environment variable variable in the provided list envp to value.

since: 2.32

Removes the environment variable variable from the provided environment envp.

since: 2.32

Mark every file descriptor equal to or greater than lowfd to be closed at the next execve() or similar, as if via the FD_CLOEXEC flag.

since: 2.80

Gets a GFileError constant based on the passed-in err_no.

Reads an entire file into allocated memory, with good error checking.

Opens a file for writing in the preferred directory for temporary files (as returned by g_get_tmp_dir()).

Reads the contents of the symbolic link filename like the POSIX readlink() function.

since: 2.4

Writes all of contents to a file named filename. This is a convenience wrapper around calling g_file_set_contents_full() with flags set to G_FILE_SET_CONTENTS_CONSISTENT | G_FILE_SET_CONTENTS_ONLY_EXISTING and mode set to 0666.

since: 2.8

Writes all of contents to a file named filename, with good error checking. If a file called filename already exists it will be overwritten.

since: 2.66

Returns TRUE if any of the tests in the bitfield test are TRUE. For example, (G_FILE_TEST_EXISTS | G_FILE_TEST_IS_DIR) will return TRUE if the file exists; the check whether it’s a directory doesn’t matter since the existence test is TRUE. With the current set of available tests, there’s no point passing in more than one test at a time.

Returns the display basename for the particular filename, guaranteed to be valid UTF-8. The display name might not be identical to the filename, for instance there might be problems converting it to UTF-8, and some files can be translated in the display.

since: 2.6

Converts a filename into a valid UTF-8 string. The conversion is not necessarily reversible, so you should keep the original around and use the return value of this function only for display purposes. Unlike g_filename_to_utf8(), the result is guaranteed to be non-NULL even if the filename actually isn’t in the GLib file name encoding.

since: 2.6

Converts an escaped ASCII-encoded URI to a local filename in the encoding used for filenames.

Converts a string from UTF-8 to the encoding GLib uses for filenames. Note that on Windows GLib uses UTF-8 for filenames; on other platforms, this function indirectly depends on the current locale.

Converts an absolute filename to an escaped ASCII-encoded URI, with the path component following Section 3.3. of RFC 2396.

Converts a string which is in the encoding used by GLib for filenames into a UTF-8 string. Note that on Windows GLib uses UTF-8 for filenames; on other platforms, this function indirectly depends on the current locale.

Locates the first executable named program in the user’s path, in the same way that execvp() would locate it. Returns an allocated string with the absolute path name, or NULL if the program is not found in the path. If program is already an absolute path, returns a copy of program if program exists and is executable, and NULL otherwise.

On Windows, if program does not have a file type suffix, tries with the suffixes .exe, .cmd, .bat and .com, and the suffixes in the PATHEXT environment variable.

A wrapper for the stdio fopen() function. The fopen() function opens a file and associates a new stream with it.

since: 2.6

Formats a size (for example the size of a file) into a human readable string. Sizes are rounded to the nearest size prefix (kB, MB, GB) and are displayed rounded to the nearest tenth. E.g. the file size 3292528 bytes will be converted into the string “3.2 MB”. The returned string is UTF-8, and may use a non-breaking space to separate the number and units, to ensure they aren’t separated when line wrapped.

since: 2.30

Formats a size (for example the size of a file) into a human readable string. Sizes are rounded to the nearest size prefix (KB, MB, GB) and are displayed rounded to the nearest tenth. E.g. the file size 3292528 bytes will be converted into the string “3.1 MB”.

deprecated: 2.30 since: 2.16

Formats a size.

since: 2.30

An implementation of the standard fprintf() function which supports positional parameters, as specified in the Single Unix Specification.

since: 2.2

Frees the memory pointed to by mem.

Frees the memory pointed to by mem, assuming it is has the given size.

since: 2.76

A wrapper for the POSIX freopen() function. The freopen() function opens a file and associates it with an existing stream.

since: 2.6

A wrapper for the POSIX fsync() function. On Windows, _commit() will be used. On macOS, fcntl(F_FULLFSYNC) will be used. The fsync() function is used to synchronize a file’s in-core state with that of the disk.

since: 2.64

Gets a human-readable name for the application, as set by g_set_application_name(). This name should be localized if possible, and is intended for display to the user. Contrast with g_get_prgname(), which gets a non-localized name. If g_set_application_name() has not been called, returns the result of g_get_prgname() (which may be NULL if g_set_prgname() has also not been called).

since: 2.2

Obtains the character set for the current locale; you might use this character set as an argument to g_convert(), to convert from the current locale’s encoding to some other encoding. (Frequently g_locale_to_utf8() and g_locale_from_utf8() are nice shortcuts, though.).

Gets the character set for the current locale.

Obtains the character set used by the console attached to the process, which is suitable for printing output to the terminal.

since: 2.62

Gets the current directory.

Equivalent to the UNIX gettimeofday() function, but portable.

deprecated: 2.62 

Gets the list of environment variables for the current process.

since: 2.28

Determines the preferred character sets used for filenames. The first character set from the charsets is the filename encoding, the subsequent character sets are used when trying to generate a displayable representation of a filename, see g_filename_display_name().

since: 2.6

Gets the current user’s home directory.

Return a name for the machine.

since: 2.8

Computes a list of applicable locale names, which can be used to e.g. construct locale-dependent filenames or search paths. The returned list is sorted from most desirable to least desirable and always contains the default locale “C”.

since: 2.6

Computes a list of applicable locale names with a locale category name, which can be used to construct the fallback locale-dependent filenames or search paths. The returned list is sorted from most desirable to least desirable and always contains the default locale “C”.

since: 2.58

Returns a list of derived variants of locale, which can be used to e.g. construct locale-dependent filenames or search paths. The returned list is sorted from most desirable to least desirable. This function handles territory, charset and extra locale modifiers. See setlocale(3) for information about locales and their format.

since: 2.28

Queries the system monotonic time.

since: 2.28

Determine the approximate number of threads that the system will schedule simultaneously for this process. This is intended to be used as a parameter to g_thread_pool_new() for CPU bound tasks and similar cases.

since: 2.36

Get information about the operating system.

since: 2.64

Gets the name of the program. This name should not be localized, in contrast to g_get_application_name().

Gets the real name of the user. This usually comes from the user’s entry in the passwd file. The encoding of the returned string is system-defined. (On Windows, it is, however, always UTF-8.) If the real user name cannot be determined, the string “Unknown” is returned.

Queries the system wall-clock time.

since: 2.28

Returns an ordered list of base directories in which to access system-wide configuration information.

since: 2.6

Returns an ordered list of base directories in which to access system-wide application data.

since: 2.6

Gets the directory to use for temporary files.

Returns a base directory in which to store non-essential, cached data specific to particular user.

since: 2.6

Returns a base directory in which to store user-specific application configuration information such as user preferences and settings.

since: 2.6

Returns a base directory in which to access application data such as icons that is customized for a particular user.

since: 2.6

Gets the user name of the current user. The encoding of the returned string is system-defined. On UNIX, it might be the preferred file name encoding, or something else, and there is no guarantee that it is even consistent on a machine. On Windows, it is always UTF-8.

Returns a directory that is unique to the current user on the local system.

since: 2.28

Returns the full path of a special directory using its logical id.

since: 2.14

Returns a base directory in which to store state files specific to particular user.

since: 2.72

Returns the value of an environment variable.

Tests if hostname contains segments with an ASCII-compatible encoding of an Internationalized Domain Name. If this returns TRUE, you should decode the hostname with g_hostname_to_unicode() before displaying it to the user.

since: 2.22

Tests if hostname is the string form of an IPv4 or IPv6 address. (Eg, “192.168.0.1”.).

since: 2.22

Tests if hostname contains Unicode characters. If this returns TRUE, you need to encode the hostname with g_hostname_to_ascii() before using it in non-IDN-aware contexts.

since: 2.22

Converts hostname to its canonical ASCII form; an ASCII-only string containing no uppercase letters and not ending with a trailing dot.

since: 2.22

Converts hostname to its canonical presentation form; a UTF-8 string in Unicode normalization form C, containing no uppercase letters, no forbidden characters, and no ASCII-encoded segments, and not ending with a trailing dot.

since: 2.22

Same as the standard UNIX routine iconv(), but may be implemented via libiconv on UNIX flavors that lack a native implementation.

Adds a function to be called whenever there are no higher priority events pending to the default main loop. The function is given the default idle priority, G_PRIORITY_DEFAULT_IDLE. If the function returns FALSE it is automatically removed from the list of event sources and will not be called again.

Adds a function to be called whenever there are no higher priority events pending.

Adds a function to be called whenever there are no higher priority events pending to the default main loop. The function is given the default idle priority, G_PRIORITY_DEFAULT_IDLE.

since: 2.74

Removes the idle function with the given data.

Creates a new idle source.

Compares the two #gint64 values being pointed to and returns TRUE if they are equal. It can be passed to g_hash_table_new() as the key_equal_func parameter, when using non-NULL pointers to 64-bit integers as keys in a GHashTable.

since: 2.22

Converts a pointer to a #gint64 to a hash value.

since: 2.22

Compares the two #gint values being pointed to and returns TRUE if they are equal. It can be passed to g_hash_table_new() as the key_equal_func parameter, when using non-NULL pointers to integers as keys in a GHashTable.

Converts a pointer to a #gint to a hash value. It can be passed to g_hash_table_new() as the hash_func parameter, when using non-NULL pointers to integer values as keys in a GHashTable.

Returns a canonical representation for string. Interned strings can be compared for equality by comparing the pointers, instead of using strcmp(). g_intern_static_string() does not copy the string, therefore string must not be freed or modified.

since: 2.10

Returns a canonical representation for string. Interned strings can be compared for equality by comparing the pointers, instead of using strcmp().

since: 2.10

Adds the GIOChannel into the default main loop context with the default priority.

Adds the GIOChannel into the default main loop context with the given priority.

Creates a GSource that’s dispatched when condition is met for the given channel. For example, if condition is G_IO_IN, the source will be dispatched when there’s data available for reading.

Gets the names of all variables set in the environment.

since: 2.8

Converts a string from UTF-8 to the encoding used for strings by the C runtime (usually the same as that used by the operating system) in the current locale. On Windows this means the system codepage.

Converts a string which is in the encoding used for strings by the C runtime (usually the same as that used by the operating system) in the current locale into a UTF-8 string.

Logs an error or debugging message.

The default log handler set up by GLib; g_log_set_default_handler() allows to install an alternate default log handler.

Gets the current fatal mask.

unstable since: 2.86

Return whether debug output from the GLib logging system is enabled.

since: 2.72

Removes the log handler.

Sets the message levels which are always fatal, in any log domain.

Enable or disable debug output from the GLib logging system for all domains.

since: 2.72

Installs a default log handler which is used if no log handler has been set for the particular log domain and log level combination.

since: 2.6

Sets the log levels which are fatal in the given domain.

Sets the log handler for a domain and a set of log levels.

Like g_log_set_handler(), but takes a destroy notify for the user_data.

since: 2.46

Set a writer function which will be called to format and write out each log message.

since: 2.50

Log a message with structured data.

since: 2.50

Log a message with structured data.

since: 2.50

Log a message with structured data, accepting the data within a GVariant.

since: 2.50

Format a structured log message and output it to the default log destination for the platform.

since: 2.50

Reset the list of domains to be logged, that might be initially set by the G_MESSAGES_DEBUG or DEBUG_INVOCATION environment variables.

since: 2.80

Configure whether the built-in log functions will output all log messages to stderr.

since: 2.68

Check whether g_log_writer_default() and g_log_default_handler() would ignore a message with the given domain and level.

since: 2.68

Format a structured log message as a string suitable for outputting to the terminal (or elsewhere).

since: 2.50

Check whether the given output_fd file descriptor is a connection to the systemd journal, or something else (like a log file or stdout or stderr).

since: 2.50

Format a structured log message and send it to the systemd journal as a set of key–value pairs.

since: 2.50

Format a structured log message and print it to either stdout or stderr, depending on its log level.

since: 2.50

Check whether the given output_fd file descriptor supports ANSI color escape sequences.

since: 2.50

Format a structured log message and send it to the syslog daemon. Only fields which are understood by this function are included in the formatted string which is printed.

since: 2.80

Logs an error or debugging message.

A wrapper for the POSIX lstat() function. The lstat() function is like stat() except that in the case of symbolic links, it returns information about the symbolic link itself and not the file that it refers to. If the system does not support symbolic links g_lstat() is identical to g_stat().

since: 2.6

Returns the currently firing source for this thread.

since: 2.12

Returns the depth of the stack of calls to g_main_context_dispatch() on any GMainContext in the current thread. That is, when called from the toplevel, it gives 0. When called from within a callback from g_main_context_iteration() (or g_main_loop_run(), etc.) it returns 1. When called from within a callback to a recursive call to g_main_context_iteration(), it returns 2. And so forth.

Allocates n_bytes bytes of memory. If n_bytes is 0 it returns NULL.

Allocates n_bytes bytes of memory, initialized to 0’s. If n_bytes is 0 it returns NULL.

This function is similar to g_malloc0(), allocating (n_blocks * n_block_bytes) bytes, but care is taken to detect possible overflow during multiplication.

since: 2.24

This function is similar to g_malloc(), allocating (n_blocks * n_block_bytes) bytes, but care is taken to detect possible overflow during multiplication.

since: 2.24

Collects the attributes of the element from the data passed to the GMarkupParser start_element function, dealing with common error conditions and supporting boolean values.

since: 2.16

Escapes text so that the markup parser will parse it verbatim. Less than, greater than, ampersand, etc. are replaced with the corresponding entities. This function would typically be used when writing out a file to be parsed with the markup parser.

Formats arguments according to format, escaping all string and character arguments in the fashion of g_markup_escape_text(). This is useful when you want to insert literal strings into XML-style markup output, without having to worry that the strings might themselves contain markup.

since: 2.4

Formats the data in args according to format, escaping all string and character arguments in the fashion of g_markup_escape_text(). See g_markup_printf_escaped().

since: 2.4

Checks whether the allocator used by g_malloc() is the system’s malloc implementation. If it returns TRUE memory allocated with malloc() can be used interchangeably with memory allocated using g_malloc(). This function is useful for avoiding an extra copy of allocated memory returned by a non-GLib-based API.

deprecated: 2.46 

GLib used to support some tools for memory profiling, but this no longer works. There are many other useful tools for memory profiling these days which can be used instead.

deprecated: 2.46 

This function used to let you override the memory allocation function. However, its use was incompatible with the use of global constructors in GLib and GIO, because those use the GLib allocators before main is reached. Therefore this function is now deprecated and is just a stub.

deprecated: 2.46 

Allocates byte_size bytes of memory, and copies byte_size bytes into it from mem. If mem is NULL it returns NULL.

deprecated: 2.68 

Allocates byte_size bytes of memory, and copies byte_size bytes into it from mem. If mem is NULL it returns NULL.

since: 2.68

A wrapper for the POSIX mkdir() function. The mkdir() function attempts to create a directory with the given name and permissions. The mode argument is ignored on Windows.

since: 2.6

Create a directory if it doesn’t already exist. Create intermediate parent directories as needed, too.

since: 2.8

Creates a temporary directory in the current directory.

since: 2.30

Creates a temporary directory in the current directory.

since: 2.30

Opens a temporary file in the current directory.

Opens a temporary file in the current directory.

since: 2.22

Set the pointer at the specified location to NULL.

Prompts the user with [E]xit, [H]alt, show [S]tack trace or [P]roceed. This function is intended to be used for debugging use only. The following example shows how it can be used together with the g_log() functions.

Invokes gdb, which attaches to the current process and shows a stack trace. Called by g_on_error_query() when the “[S]tack trace” option is selected. You can get the current process’s program name with g_get_prgname(), assuming that you have called gtk_init() or gdk_init().

A wrapper for the POSIX open() function. The open() function is used to convert a pathname into a file descriptor.

since: 2.6

Parses a string containing debugging options into a %guint containing bit flags. This is used within GDK and GTK to parse the debug options passed on the command line or through environment variables.

Gets the last component of the filename.

Gets the directory components of a file name. For example, the directory component of /usr/bin/test is /usr/bin. The directory component of / is /.

Returns TRUE if the given file_name is an absolute file name. Note that this is a somewhat vague concept on Windows.

Returns a pointer into file_name after the root component, i.e. after the “/” in UNIX or “C:" under Windows. If file_name is not an absolute path it returns NULL.

Matches a string against a compiled pattern.

deprecated: 2.70 

Matches a string against a pattern given as a string.

Matches a string against a compiled pattern.

deprecated: 2.70 

This is equivalent to g_bit_lock, but working on pointers (or other pointer-sized values).

since: 2.30

This is equivalent to g_bit_lock, but working on pointers (or other pointer-sized values).

since: 2.80

This mangles ptr as g_pointer_bit_lock() and g_pointer_bit_unlock() do.

since: 2.80

This is equivalent to g_bit_trylock(), but working on pointers (or other pointer-sized values).

since: 2.30

This is equivalent to g_bit_unlock, but working on pointers (or other pointer-sized values).

since: 2.30

This is equivalent to g_pointer_bit_unlock() and atomically setting the pointer value.

since: 2.80

Polls fds, as with the poll() system call, but portably. (On systems that don’t have poll(), it is emulated using select().) This is used internally by GMainContext, but it can be called directly if you need to block until a file descriptor is ready, but don’t want to run the full main loop.

since: 2.20

Formats a string according to format and prefix it to an existing error message. If err is NULL (ie: no error variable) then do nothing.

since: 2.16

Prefixes prefix to an existing error message. If err or *err is NULL (i.e.: no error variable) then do nothing.

since: 2.70

Outputs a formatted message via the print handler.

Outputs a formatted message via the error message handler.

An implementation of the standard printf() function which supports positional parameters, as specified in the Single Unix Specification.

since: 2.2

Calculates the maximum space needed to store the output of the sprintf() function.

If dest is NULL, free src; otherwise, moves src into *dest. The error variable dest points to must be NULL.

If dest is NULL, free src; otherwise, moves src into *dest. *dest must be NULL. After the move, add a prefix as with g_prefix_error().

since: 2.16

This is just like the standard C qsort() function, but the comparison routine accepts a user data argument (like qsort_r()).

deprecated: 2.82 

Gets the GQuark identifying the given (static) string. If the string does not currently have an associated GQuark, a new GQuark is created, linked to the given string.

Gets the GQuark identifying the given string. If the string does not currently have an associated GQuark, a new GQuark is created, using a copy of the string.

Gets the string associated with the given GQuark.

Gets the GQuark associated with the given string, or 0 if string is NULL or it has no associated GQuark.

Returns a random #gdouble equally distributed over the range [0..1).

Returns a random #gdouble equally distributed over the range [begin..end).

Return a random #guint32 equally distributed over the range [0..2^32-1].

Returns a random #gint32 equally distributed over the range [begin..end-1].

Sets the seed for the global random number generator, which is used by the g_random_* functions, to seed.

Acquires a reference on the data pointed by mem_block.

since: 2.58

Allocates block_size bytes of memory, and adds reference counting semantics to it.

since: 2.58

Allocates block_size bytes of memory, and adds reference counting semantics to it.

since: 2.58

Allocates a new block of data with reference counting semantics, and copies block_size bytes of mem_block into it.

since: 2.58

Retrieves the size of the reference counted data pointed by mem_block.

since: 2.58

Releases a reference on the data pointed by mem_block.

since: 2.58

Releases a reference on the data pointed by mem_block.

since: 2.58

Reallocates the memory pointed to by mem, so that it now has space for n_bytes bytes of memory. It returns the new address of the memory, which may have been moved. mem may be NULL, in which case it’s considered to have zero-length. n_bytes may be 0, in which case NULL will be returned and mem will be freed unless it is NULL.

This function is similar to g_realloc(), allocating (n_blocks * n_block_bytes) bytes, but care is taken to detect possible overflow during multiplication.

since: 2.24

Compares the current value of rc with val.

since: 2.58

Decreases the reference count.

since: 2.58

Increases the reference count.

since: 2.58

Initializes a reference count variable to 1.

since: 2.58

Acquires a reference on a string.

since: 2.58

Compares two ref-counted strings for byte-by-byte equality.

since: 2.84

Retrieves the length of str.

since: 2.58

Creates a new reference counted string and copies the contents of str into it.

since: 2.58

Creates a new reference counted string and copies the content of str into it.

since: 2.58

Creates a new reference counted string and copies the contents of str into it, up to len bytes.

since: 2.58

Releases a reference on a string; if it was the last reference, the resources allocated by the string are freed as well.

since: 2.58

Resets the cache used for g_get_user_special_dir(), so that the latest on-disk version is used. Call this only if you just changed the data on disk yourself.

since: 2.22

A wrapper for the POSIX remove() function. The remove() function deletes a name from the filesystem.

since: 2.6

A wrapper for the POSIX rename() function. The rename() function renames a file, moving it between directories if required.

since: 2.6

Internal function used to print messages from the public g_return_if_fail() and g_return_val_if_fail() macros.

A wrapper for the POSIX rmdir() function. The rmdir() function deletes a directory from the filesystem.

since: 2.6

Sets a human-readable name for the application. This name should be localized if possible, and is intended for display to the user. Contrast with g_set_prgname(), which sets a non-localized name. g_set_prgname() will be called automatically by gtk_init(), but g_set_application_name() will not.

since: 2.2

Does nothing if err is NULL; if err is non-NULL, then *err must be NULL. A new GError is created and assigned to *err.

Does nothing if err is NULL; if err is non-NULL, then *err must be NULL. A new GError is created and assigned to *err. Unlike g_set_error(), message is not a printf()-style format string. Use this function if message contains text you don’t have control over, that could include printf() escape sequences.

since: 2.18

Sets the name of the program. This name should not be localized, in contrast to g_set_application_name().

Sets the print handler to func, or resets it to the default GLib handler if NULL.

Sets the handler for printing error messages to func, or resets it to the default GLib handler if NULL.

Updates a pointer to a string to a copy of new_str and returns whether the string was changed.

since: 2.76

Sets an environment variable. On UNIX, both the variable’s name and value can be arbitrary byte strings, except that the variable’s name cannot contain ‘=’. On Windows, they should be in UTF-8.

since: 2.4

Parses a command line into an argument vector, in much the same way the shell would, but without many of the expansions the shell would perform (variable expansion, globs, operators, filename expansion, etc. are not supported).

Quotes a string so that the shell (/bin/sh) will interpret the quoted string to mean unquoted_string.

Unquotes a string as the shell (/bin/sh) would.

Allocates a block of memory from the libc allocator.

since: 2.10

Allocates a block of memory via g_slice_alloc() and initializes the returned memory to 0.

since: 2.10

Allocates a block of memory from the slice allocator and copies block_size bytes into it from mem_block.

since: 2.14

Frees a block of memory.

since: 2.10

Frees a linked list of memory blocks of structure type type.

since: 2.10

A safer form of the standard sprintf() function. The output is guaranteed to not exceed n characters (including the terminating nul character), so it is easy to ensure that a buffer overflow cannot occur.

This is just like the standard C qsort() function, but the comparison routine accepts a user data argument (like qsort_r()).

since: 2.82

Gets the smallest prime number from a built-in array of primes which is larger than num. This is used within GLib to calculate the optimum size of a GHashTable.

Executes a child program asynchronously.

Executes a child program asynchronously.

since: 2.58

Identical to g_spawn_async_with_pipes_and_fds() but with n_fds set to zero, so no FD assignments are used.

Executes a child program asynchronously (your program will not block waiting for the child to exit).

since: 2.68

An old name for g_spawn_check_wait_status(), deprecated because its name is misleading.

deprecated: 2.70 since: 2.34

Set error if wait_status indicates the child exited abnormally (e.g. with a nonzero exit code, or via a fatal signal).

since: 2.70

On some platforms, notably Windows, the GPid type represents a resource which must be closed to prevent resource leaking. g_spawn_close_pid() is provided for this purpose. It should be used on all platforms, even though it doesn’t do anything under UNIX.

A simple version of g_spawn_async() that parses a command line with g_shell_parse_argv() and passes it to g_spawn_async().

A simple version of g_spawn_sync() with little-used parameters removed, taking a command line instead of an argument vector.

Executes a child synchronously (waits for the child to exit before returning).

An implementation of the standard sprintf() function which supports positional parameters, as specified in the Single Unix Specification.

since: 2.2

A wrapper for the POSIX stat() function. The stat() function returns information about a file. On Windows the stat() function in the C library checks only the FAT-style READONLY attribute and does not look at the ACL at all. Thus on Windows the protection bits in the st_mode field are a fabrication of little use.

since: 2.6

Sets fd_ptr to -1, returning the value that was there before.

since: 2.70

Sets handle_pointer to 0, returning the value that was there before.

since: 2.84

Sets pp to NULL, returning the value that was there before.

since: 2.44

Copies a nul-terminated string into the destination buffer, including the trailing nul byte, and returns a pointer to the trailing nul byte in dest. The return value is useful for concatenating multiple strings without having to repeatedly scan for the end.

Compares two strings for byte-by-byte equality and returns TRUE if they are equal. It can be passed to g_hash_table_new() as the key_equal_func parameter, when using non-NULL strings as keys in a GHashTable.

Looks whether the string str begins with prefix.

since: 2.2

Looks whether a string ends with suffix.

since: 2.2

Converts a string to a hash value.

Determines if a string is pure ASCII. A string is pure ASCII if it contains no bytes with the high bit set.

since: 2.40

Checks if a search conducted for search_term should match potential_hit.

since: 2.40

Transliterate str to plain ASCII.

since: 2.40

Tokenizes string and performs folding on each token.

since: 2.40

For each character in string, if the character is not in valid_chars, replaces the character with substitutor.

A case-insensitive string comparison, corresponding to the standard strcasecmp() function on platforms which support it.

deprecated: 2.2 

Removes trailing whitespace from a string.

Removes leading whitespace from a string, by moving the rest of the characters forward.

Compares str1 and str2 like strcmp().

since: 2.16

Makes a copy of a string replacing C string-style escape sequences with their one byte equivalent:.

Concatenates all of the given strings into one long string.

Converts any delimiter characters in string to new_delimiter.

Converts a string to lower case.

deprecated: 2.2 

Duplicates a string. If str is NULL it returns NULL.

Similar to the standard C sprintf() function but safer, since it calculates the maximum space required and allocates memory to hold the result.

Similar to the standard C vsprintf() function but safer, since it calculates the maximum space required and allocates memory to hold the result.

Copies an array of strings. The copy is a deep copy; each string is also copied.

Returns a string corresponding to the given error code, e.g. “no such process”.

It replaces the following special characters in the string source with their corresponding C escape sequence:.

Frees an array of strings, as well as each string it contains.

An auxiliary function for gettext() support (see Q_()).

since: 2.4

Joins a number of strings together to form one long string, with the optional separator inserted between each of them.

Joins an array of strings together to form one long string, with the optional separator inserted between each of them.

Portability wrapper that calls strlcat() on systems which have it, and emulates it otherwise. Appends nul-terminated src string to dest, guaranteeing nul-termination for dest. The total size of dest won’t exceed dest_size.

Portability wrapper that calls strlcpy() on systems which have it, and emulates strlcpy() otherwise. Copies src to dest; dest is guaranteed to be nul-terminated; src must be nul-terminated; dest_size is the buffer size, not the number of bytes to copy.

A case-insensitive string comparison, corresponding to the standard strncasecmp() function on platforms which support it. It is similar to g_strcasecmp() except it only compares the first n characters of the strings.

deprecated: 2.2 

Duplicates the first n bytes of a string, returning a newly-allocated buffer n + 1 bytes long which will always be nul-terminated. If str is less than n bytes long the buffer is padded with nuls. If str is NULL it returns NULL.

Creates a new string length bytes long filled with fill_char.

Reverses all of the bytes in a string. For example, g_strreverse ("abcdef") will result in “fedcba”.

Searches the string haystack for the last occurrence of the string needle.

Searches the string haystack for the last occurrence of the string needle, limiting the length of the search to haystack_len.

Returns a string describing the given signal, e.g. “Segmentation fault”. If the signal is unknown, it returns “unknown signal (<signum>)”.

Splits a string into a maximum of max_tokens pieces, using the given delimiter. If max_tokens is reached, the remainder of string is appended to the last token.

Splits string into a number of tokens not containing any of the characters in delimiters. A token is the (possibly empty) longest string that does not contain any of the characters in delimiters. If max_tokens is reached, the remainder is appended to the last token.

since: 2.4

Searches the string haystack for the first occurrence of the string needle, limiting the length of the search to haystack_len or a nul terminator byte (whichever is reached first).

Converts a string to a floating point value.

Converts a string to upper case.

deprecated: 2.2 

Checks if an array of strings contains the string str according to g_str_equal(). strv must not be NULL.

since: 2.44

Checks if two arrays of strings contain exactly the same elements in exactly the same order.

since: 2.60

Returns the length of an array of strings. str_array must not be NULL.

since: 2.6

Creates a new test case.

since: 2.16

Creates a new test case.

since: 2.34

Creates a new test case.

since: 2.16

Adds a message to test reports that associates a bug URI with a test case.

since: 2.16

Specifies the base URI for bug reports.

since: 2.16

Creates the pathname to a data file that is required for a test.

since: 2.38

Creates a new GTestCase.

since: 2.16

Creates a new test suite with the name suite_name.

since: 2.16

Attempts to disable system crash reporting infrastructure.

since: 2.78

Indicates that a message with the given log_domain and log_level, with text matching pattern, is expected to be logged.

since: 2.34

Indicates that a test failed.

since: 2.30

Indicates that a test failed and records a message.

since: 2.70

Returns whether a test has already failed.

since: 2.38

Gets the pathname of the directory containing test files of the type specified by file_type.

since: 2.38

Gets the pathname to a data file that is required for a test.

since: 2.38

Gets the test path for the test currently being run.

since: 2.68

Gets the toplevel test suite for the test path API.

since: 2.16

Indicates that a test failed because of some incomplete functionality.

since: 2.38

Indicates that a test failed because of some incomplete functionality.

since: 2.70

Initializes the GLib testing framework.

since: 2.16

Installs a non-error fatal log handler which can be used to decide whether log messages which are counted as fatal abort the program.

since: 2.22

Reports the result of a performance or measurement test.

since: 2.16

Adds a message to the test report.

since: 2.16

Reports the result of a performance or measurement test.

since: 2.16

Enqueues a callback destroy_func to be executed during the next test case teardown phase.

since: 2.16

Enqueues a pointer to be released with g_free() during the next teardown phase.

since: 2.16

Gets a reproducible random floating point number.

since: 2.16

Gets a reproducible random floating point number out of a specified range.

since: 2.16

Gets a reproducible random integer number.

since: 2.16

Gets a reproducible random integer number out of a specified range.

since: 2.16

Runs all tests under the toplevel suite.

since: 2.16

Executes the tests within suite and all nested test suites.

since: 2.16

Changes the behaviour of the various assertion macros.

since: 2.38

Indicates that a test was skipped.

since: 2.38

Indicates that a test was skipped.

since: 2.70

Returns true if the test program is running under g_test_trap_subprocess().

since: 2.38

Sets the summary for a test.

since: 2.62

Gets the number of seconds since the last start of the timer with g_test_timer_start().

since: 2.16

Reports the last result of g_test_timer_elapsed().

since: 2.16

Starts a timing test.

since: 2.16

Forks the current test program to execute a test case that might not return or that might abort.

deprecated: Unknown since: 2.16

Checks the result of the last g_test_trap_subprocess() call.

since: 2.16

Checks the result of the last g_test_trap_subprocess() call.

since: 2.16

Respawns the test program to run only test_path in a subprocess.

since: 2.38

Respawns the test program to run only test_path in a subprocess with a given environment.

since: 2.80

Sets a function to be called at regular intervals, with the default priority, G_PRIORITY_DEFAULT.

Sets a function to be called at regular intervals, with the given priority. The function is called repeatedly until it returns FALSE, at which point the timeout is automatically destroyed and the function will not be called again. The notify function is called when the timeout is destroyed. The first call to the function will be at the end of the first interval.

Sets a function to be called after interval milliseconds have elapsed, with the default priority, G_PRIORITY_DEFAULT.

since: 2.74

Sets a function to be called at regular intervals with the default priority, G_PRIORITY_DEFAULT.

since: 2.14

Sets a function to be called at regular intervals, with priority.

since: 2.14

This function behaves like g_timeout_add_once() but with a range in seconds.

since: 2.78

Creates a new timeout source.

Creates a new timeout source.

since: 2.14

Attempts to allocate n_bytes, and returns NULL on failure. Contrast with g_malloc(), which aborts the program on failure.

Attempts to allocate n_bytes, initialized to 0’s, and returns NULL on failure. Contrast with g_malloc0(), which aborts the program on failure.

since: 2.8

This function is similar to g_try_malloc0(), allocating (n_blocks * n_block_bytes) bytes, but care is taken to detect possible overflow during multiplication.

since: 2.24

This function is similar to g_try_malloc(), allocating (n_blocks * n_block_bytes) bytes, but care is taken to detect possible overflow during multiplication.

since: 2.24

Attempts to realloc mem to a new size, n_bytes, and returns NULL on failure. Contrast with g_realloc(), which aborts the program on failure.

This function is similar to g_try_realloc(), allocating (n_blocks * n_block_bytes) bytes, but care is taken to detect possible overflow during multiplication.

since: 2.24

Convert a string from UCS-4 to UTF-16.

Convert a string from a 32-bit fixed width representation as UCS-4. to UTF-8.

Determines the break type of c. c should be a Unicode character (to derive a character from UTF-8 encoded text, use g_utf8_get_char()). The break type is used to find word and line breaks (“text boundaries”), Pango implements the Unicode boundary resolution algorithms and normally you would use a function such as pango_break() instead of caring about break types yourself.

Determines the canonical combining class of a Unicode character.

since: 2.14

Performs a single composition step of the Unicode canonical composition algorithm.

since: 2.30

Performs a single decomposition step of the Unicode canonical decomposition algorithm.

since: 2.30

Determines the numeric value of a character as a decimal digit.

Computes the canonical or compatibility decomposition of a Unicode character. For compatibility decomposition, pass TRUE for compat; for canonical decomposition pass FALSE for compat.

since: 2.30

In Unicode, some characters are “mirrored”. This means that their images are mirrored horizontally in text that is laid out from right to left. For instance, “(” would become its mirror image, “)”, in right-to-left text.

since: 2.4

Looks up the GUnicodeScript for a particular character (as defined by Unicode Standard Annex #24). No check is made for ch being a valid Unicode character; if you pass in invalid character, the result is undefined.

since: 2.14

Determines whether a character is alphanumeric. Given some UTF-8 text, obtain a character value with g_utf8_get_char().

Determines whether a character is alphabetic (i.e. a letter). Given some UTF-8 text, obtain a character value with g_utf8_get_char().

Determines whether a character is a control character. Given some UTF-8 text, obtain a character value with g_utf8_get_char().

Determines if a given character is assigned in the Unicode standard.

Determines whether a character is numeric (i.e. a digit). This covers ASCII 0-9 and also digits in other languages/scripts. Given some UTF-8 text, obtain a character value with g_utf8_get_char().

Determines whether a character is printable and not a space (returns FALSE for control characters, format characters, and spaces). g_unichar_isprint() is similar, but returns TRUE for spaces. Given some UTF-8 text, obtain a character value with g_utf8_get_char().

Determines whether a character is a lowercase letter. Given some UTF-8 text, obtain a character value with g_utf8_get_char().

Determines whether a character is a mark (non-spacing mark, combining mark, or enclosing mark in Unicode speak). Given some UTF-8 text, obtain a character value with g_utf8_get_char().

since: 2.14

Determines whether a character is printable. Unlike g_unichar_isgraph(), returns TRUE for spaces. Given some UTF-8 text, obtain a character value with g_utf8_get_char().

Determines whether a character is punctuation or a symbol. Given some UTF-8 text, obtain a character value with g_utf8_get_char().

Determines whether a character is a space, tab, or line separator (newline, carriage return, etc.). Given some UTF-8 text, obtain a character value with g_utf8_get_char().

Determines if a character is titlecase. Some characters in Unicode which are composites, such as the DZ digraph have three case variants instead of just two. The titlecase form is used at the beginning of a word where only the first letter is capitalized. The titlecase form of the DZ digraph is U+01F2 LATIN CAPITAL LETTTER D WITH SMALL LETTER Z.

Determines if a character is uppercase.

Determines if a character is typically rendered in a double-width cell.

Determines if a character is typically rendered in a double-width cell under legacy East Asian locales. If a character is wide according to g_unichar_iswide(), then it is also reported wide with this function, but the converse is not necessarily true. See the Unicode Standard Annex #11 for details.

since: 2.12

Determines if a character is a hexadecimal digit.

Determines if a given character typically takes zero width when rendered. The return value is TRUE for all non-spacing and enclosing marks (e.g., combining accents), format characters, zero-width space, but not U+00AD SOFT HYPHEN.

since: 2.14

Converts a single character to UTF-8.

Converts a character to lower case.

Converts a character to the titlecase.

Converts a character to uppercase.

Classifies a Unicode character by type.

Checks whether ch is a valid Unicode character.

Determines the numeric value of a character as a hexadecimal digit.

Computes the canonical decomposition of a Unicode character.

deprecated: 2.30 

Computes the canonical ordering of a string in-place. This rearranges decomposed characters in the string according to their combining classes. See the Unicode manual for more information.

A wrapper for the POSIX unlink() function. The unlink() function deletes a name from the filesystem. If this was the last link to the file and no processes have it opened, the diskspace occupied by the file is freed.

since: 2.6

Removes an environment variable from the environment.

since: 2.4

Pauses the current thread for the given number of microseconds.

Convert a string from UTF-16 to UCS-4.

Convert a string from UTF-16 to UTF-8.

Converts a string into a form that is independent of case. The result will not correspond to any particular case, but can be compared for equality or ordered with the results of calling g_utf8_casefold() on other strings.

Compares two strings for ordering using the linguistically correct rules for the current locale. When sorting a large number of strings, it will be significantly faster to obtain collation keys with g_utf8_collate_key() and compare the keys with strcmp() when sorting instead of sorting the original strings.

Converts a string into a collation key that can be compared with other collation keys produced by the same function using strcmp().

Converts a string into a collation key that can be compared with other collation keys produced by the same function using strcmp().

since: 2.8

Finds the start of the next UTF-8 character in the string after p.

Given a position p with a UTF-8 encoded string str, find the start of the previous UTF-8 character starting before p. Returns NULL if no UTF-8 characters are present in str before p.

Converts a sequence of bytes encoded as UTF-8 to a Unicode character.

Convert a sequence of bytes encoded as UTF-8 to a Unicode character.

If the provided string is valid UTF-8, return a copy of it. If not, return a copy in which bytes that could not be interpreted as valid Unicode are replaced with the Unicode replacement character (U+FFFD).

since: 2.52

Converts a string into canonical form, standardizing such issues as whether a character with an accent is represented as a base character and combining accent or as a single precomposed character. The string has to be valid UTF-8, otherwise NULL is returned. You should generally call g_utf8_normalize() before comparing two Unicode strings.

Converts from an integer character offset to a pointer to a position within the string.

Converts from a pointer to position within a string to an integer character offset.

Finds the previous UTF-8 character in the string before p.

Finds the leftmost occurrence of the given Unicode character in a UTF-8 encoded string, while limiting the search to len bytes.

Converts all Unicode characters in the string that have a case to lowercase. The exact manner that this is done depends on the current locale, and may result in the number of characters in the string changing.

Computes the length of the string in characters, not including the terminating nul character. If the max’th byte falls in the middle of a character, the last (partial) character is not counted.

Like the standard C strncpy() function, but copies a given number of characters instead of a given number of bytes.

Find the rightmost occurrence of the given Unicode character in a UTF-8 encoded string, while limiting the search to len bytes.

Reverses a UTF-8 string.

since: 2.2

Converts all Unicode characters in the string that have a case to uppercase. The exact manner that this is done depends on the current locale, and may result in the number of characters in the string increasing. (For instance, the German ess-zet will be changed to SS.).

Copies a substring out of a UTF-8 encoded string. The substring will contain end_pos - start_pos characters.

since: 2.30

Convert a string from UTF-8 to a 32-bit fixed width representation as UCS-4.

Convert a string from UTF-8 to a 32-bit fixed width representation as UCS-4, assuming valid UTF-8 input.

Convert a string from UTF-8 to UTF-16.

Cuts off the middle of the string, preserving half of truncate_length characters at the beginning and half at the end.

since: 2.78

Validates UTF-8 encoded text.

Validates UTF-8 encoded text.

since: 2.60

A wrapper for the POSIX utime() function. The utime() function sets the access and modification timestamps of a file.

since: 2.18

Parses the string str and verify if it is a UUID.

since: 2.52

Generates a random UUID (RFC 4122 version 4) as a string. It has the same randomness guarantees as GRand, so must not be used for cryptographic purposes such as key generation, nonces, salts or one-time pads.

since: 2.52

An implementation of the GNU vasprintf() function which supports positional parameters, as specified in the Single Unix Specification. This function is similar to g_vsprintf(), except that it allocates a string to hold the output, instead of putting the output in a buffer you allocate in advance.

since: 2.4

An implementation of the standard fprintf() function which supports positional parameters, as specified in the Single Unix Specification.

since: 2.2

An implementation of the standard vprintf() function which supports positional parameters, as specified in the Single Unix Specification.

since: 2.2

A safer form of the standard vsprintf() function. The output is guaranteed to not exceed n characters (including the terminating nul character), so it is easy to ensure that a buffer overflow cannot occur.

An implementation of the standard vsprintf() function which supports positional parameters, as specified in the Single Unix Specification.

since: 2.2

Internal function used to print messages from the public g_warn_if_reached() and g_warn_if_fail() macros.

A wrapper for the POSIX abort() function.

since: 2.50

Return the minimal alignment required by the platform ABI for values of the given type. The address of a variable or struct member of the given type must always be a multiple of this alignment. For example, most platforms require int variables to be aligned at a 4-byte boundary, so G_ALIGNOF (int) is 4 on most platforms.

since: 2.60

Allocates size bytes on the stack; these bytes will be freed when the current stack frame is cleaned up. This macro essentially just wraps the alloca() function present on most UNIX variants. Thus it provides the same advantages and pitfalls as alloca():.

Wraps g_alloca() and initializes allocated memory to zeroes. If size is 0 it returns NULL.

since: 2.72

Evaluates to a truth value if the absolute difference between a and b is smaller than epsilon, and to a false value otherwise.

since: 2.58

Adds the value on to the end of the array. The array will grow in size automatically if necessary.

Returns the element of a GArray at the given index. The return value is cast to the given type. This is the main way to read or write an element in a GArray.

Inserts an element into an array at the given index.

Adds the value on to the start of the array. The array will grow in size automatically if necessary.

Determines whether a character is alphanumeric.

Determines whether a character is alphabetic (i.e. a letter).

Determines whether a character is a control character.

Determines whether a character is digit (0-9).

Determines whether a character is a printing character and not a space.

Determines whether a character is an ASCII lower case letter.

Determines whether a character is a printing character.

Determines whether a character is a punctuation character.

Determines whether a character is a white-space character.

Determines whether a character is an ASCII upper case letter.

Determines whether a character is a hexadecimal-digit character.

Debugging macro to terminate the application if the assertion fails.

Debugging macro to compare two floating point numbers.

since: 2.16

Debugging macro to compare two floating point numbers within an epsilon.

since: 2.58

Debugging macro to compare to unsigned integers.

since: 2.16

Debugging macro to compare two integers.

since: 2.16

Debugging macro to compare memory regions.

since: 2.46

Debugging macro to compare two strings.

since: 2.16

Debugging macro to check if two NULL-terminated string arrays (i.e. 2 GStrv) are equal.

since: 2.68

Debugging macro to compare two unsigned integers.

since: 2.16

Debugging macro to compare two GVariant values.

since: 2.60

Debugging macro to check that a method has returned the correct GError.

since: 2.20

Debugging macro to check an expression is false.

since: 2.38

Debugging macro to check that an expression has a non-negative return value, as used by traditional POSIX functions (such as rmdir()) to indicate success.

since: 2.66

Debugging macro to check that a GError is not set.

since: 2.20

Debugging macro to check an expression is not NULL.

since: 2.40

Debugging macro to terminate the application if it is ever reached.

Debugging macro to check an expression is NULL.

since: 2.38

Debugging macro to check that an expression is true.

since: 2.38

A convenience macro to allocate atomically reference counted data with the size of the given type.

since: 2.58

A convenience macro to allocate atomically reference counted data with the size of the given type, and set its contents to zero.

since: 2.58

Works like G_MUTEX_AUTO_LOCK(), but for a lock defined with G_LOCK_DEFINE().

since: 2.80

Inserts a breakpoint instruction into the code.

Macro to check if the current compiler supports a specified version of the C standard. Such value must be numeric and can be provided both in the short form for the well-known versions (e.g. 90, 99…) or in the complete form otherwise (e.g. 199000L, 199901L, 205503L…).

since: 2.76

Checks whether the version of the GLib library that is being compiled against is greater than or equal to the given one.

deprecated: 2.10 

deprecated: 2.10 

deprecated: 2.10 

Logs a ‘critical warning’ (G_LOG_LEVEL_CRITICAL).

Macro to check if the current compiler supports a specified version of the C++ standard. Such value must be numeric and can be provided both in the short form for the well-known versions (e.g. 11, 17…) or in the complete form otherwise (e.g. 201103L, 201703L, 205503L…).

since: 2.76

Removes an element, using its GQuark identifier.

Sets the data corresponding to the given GQuark id. Any previous data with the same key is removed, and its destroy function is called.

Removes an element using its string identifier. The data element’s destroy function is called if it has been set.

Removes an element, without calling its destroy notifier.

Sets the data element corresponding to the given string identifier.

Sets the data element corresponding to the given string identifier, and the function to be called when the data element is removed.

Gets the data element corresponding to a string.

Removes a data element from a dataset. The data element’s destroy function is called if it has been set.

Sets the data element associated with the given GQuark id. Any previous data with the same key is removed, and its destroy function is called.

Removes a data element corresponding to a string. Its destroy function is called if it has been set.

Removes an element, without calling its destroy notifier.

Sets the data corresponding to the given string identifier.

Sets the data corresponding to the given string identifier, and the function to call when the data element is destroyed.

A convenience function/macro to log a debug message.

since: 2.6

A convenience form of g_log_structured(), recommended to be added to functions when debugging. It prints the current monotonic time and the code location using G_STRLOC.

since: 2.50

Defines the appropriate cleanup function for a type.

since: 2.44

Defines the appropriate cleanup function for a type.

since: 2.44

Defines the appropriate cleanup function for a pointer type.

since: 2.44

A convenience macro which defines two functions. First, returning the GQuark for the extended error type ErrorType; it is called error_type_quark(). Second, returning the private data from a passed GError; it is called error_type_get_private().

since: 2.68

A convenience macro which defines a function returning the GQuark for the name QN. The function will be named q_n_quark().

since: 2.34

A convenience function/macro to log an error message.

Expands to the GNU C alloc_size function attribute if the compiler is a new enough gcc. This attribute tells the compiler that the function returns a pointer to memory of a size that is specified by the xth function parameter.

since: 2.18

Expands to the GNU C alloc_size function attribute if the compiler is a new enough gcc. This attribute tells the compiler that the function returns a pointer to memory of a size that is specified by the product of two function parameters.

since: 2.18

Expands to a check for a compiler with GNUC defined and a version greater than or equal to the major and minor numbers provided. For example, the following would only match on compilers such as GCC 4.8 or newer.

since: 2.42

Like G_GNUC_DEPRECATED, but names the intended replacement for the deprecated symbol if the version of gcc in use is new enough to support custom deprecation messages.

since: 2.26

Expands to the GNU C format_arg function attribute if the compiler is gcc. This function attribute specifies that a function takes a format string for a printf(), scanf(), strftime() or strfmon() style function and modifies it, so that the result can be passed to a printf(), scanf(), strftime() or strfmon() style function (with the remaining arguments to the format function the same as they would have been for the unmodified string).

Expands to the GNU C format function attribute if the compiler is gcc. This is used for declaring functions which take a variable number of arguments, with the same syntax as printf(). It allows the compiler to type-check the arguments passed to the function.

Expands to the GNU C format function attribute if the compiler is gcc. This is used for declaring functions which take a variable number of arguments, with the same syntax as scanf(). It allows the compiler to type-check the arguments passed to the function.

Expands to the GNU C strftime format function attribute if the compiler is gcc. This is used for declaring functions which take a format argument which is passed to strftime() or an API implementing its formats. It allows the compiler check the format passed to the function.

since: 2.60

This function is deprecated and will be removed in the next major release of GLib. It does nothing.

This function is deprecated and will be removed in the next major release of GLib. It does nothing.

Returns TRUE if the GHook is active, which is normally the case until the GHook is destroyed.

Appends a GHook onto the end of a GHookList.

Gets the flags of a hook.

Returns TRUE if the GHook function is currently executing.

Converts a 32-bit integer value from host to network byte order.

Converts a 16-bit integer value from host to network byte order.

A convenience function/macro to log an informational message.

since: 2.40

Hints the compiler that the expression is likely to evaluate to a true value. The compiler may use this information for optimizations.

since: 2.2

A convenience macro to get the next element in a GList. Note that it is considered perfectly acceptable to access list->next directly.

A convenience macro to get the previous element in a GList. Note that it is considered perfectly acceptable to access list->prev directly.

Works like g_mutex_lock(), but for a lock defined with G_LOCK_DEFINE.

The G_LOCK_ macros provide a convenient interface to GMutex. G_LOCK_DEFINE defines a lock. It can appear in any place where variable definitions may appear in programs, i.e. in the first block of a function or outside of functions. The name parameter will be mangled to get the name of the GMutex. This means that you can use names of existing variables as the parameter - e.g. the name of the variable you intend to protect with the lock. Look at our give_me_next_number() example using the G_LOCK macros:.

This works like G_LOCK_DEFINE, but it creates a static object.

This declares a lock, that is defined with G_LOCK_DEFINE in another module.

Frees the memory allocated for the GMainLoop.

deprecated: 2.2 

Checks if the main loop is running.

deprecated: 2.2 

Runs a single iteration for the default GMainContext.

deprecated: 2.2 

Creates a new GMainLoop for th default main context.

deprecated: 2.2 

Checks if any events are pending for the default GMainContext (i.e. ready to be processed).

deprecated: 2.2 

Stops the GMainLoop. If g_main_run() was called to run the GMainLoop, it will now return.

deprecated: 2.2 

Runs a main loop until it stops running.

deprecated: 2.2 

Sets the function to use for the handle polling of file descriptors for the default main context.

deprecated: 2.2 

deprecated: 2.10 

Copies a block of memory len bytes long, from src to dest. The source and destination areas may overlap.

deprecated: 2.40 

A convenience function/macro to log a normal message.

Declare a GMutexLocker variable with g_autoptr() and lock the mutex. The mutex will be unlocked automatically when leaving the scope. The variable is declared with G_GNUC_UNUSED to avoid compiler warning if it is not used in the scope.

since: 2.80.0

Determines the number of elements in an array. The array must be declared so the compiler knows its size at compile-time; this macro will not work on an array allocated on the heap, only static arrays or arrays on the stack.

Allocates n_structs elements of type struct_type. The returned pointer is cast to a pointer to the given type. If n_structs is 0 it returns NULL. Care is taken to avoid overflow when calculating the size of the allocated block.

Allocates n_structs elements of type struct_type, initialized to 0’s. The returned pointer is cast to a pointer to the given type. If n_structs is 0 it returns NULL. Care is taken to avoid overflow when calculating the size of the allocated block.

Wraps g_alloca() in a more typesafe manner.

Wraps g_alloca0() in a more typesafe manner.

since: 2.72

Inserts a GNode as the last child of the given parent.

Inserts a new GNode as the last child of the given parent.

Gets the first child of a GNode.

Inserts a new GNode at the given position.

Inserts a new GNode after the given sibling.

Inserts a new GNode before the given sibling.

Gets the next sibling of a GNode.

Inserts a new GNode as the first child of the given parent.

Gets the previous sibling of a GNode.

Converts a 32-bit integer value from network to host byte order.

Converts a 16-bit integer value from network to host byte order.

The first call to this routine by a process with a given GOnce struct calls func with the given argument. Thereafter, subsequent calls to g_once() with the same GOnce struct do not call func again, but return the stored result of the first call. On return from g_once(), the status of once will be G_ONCE_STATUS_READY.

since: 2.4

Yields a new preprocessor pasted identifier identifier1identifier2 from its expanded arguments identifier1 and identifier2. For example, the following code:

#define GET(traveller,method) G_PASTE(traveller_get_, method) (traveller)
const gchar *name = GET (traveller, name);
const gchar *quest = GET (traveller, quest);
GdkColor *favourite = GET (traveller, favourite_colour);

since: 2.20

A macro to assist with the static initialisation of a GPrivate.

since: 2.32

Returns the pointer at the given index of the pointer array.

Returns a random #gboolean from rand_. This corresponds to an unbiased coin toss.

Returns a random #gboolean. This corresponds to an unbiased coin toss.

A convenience macro to allocate reference counted data with the size of the given type.

since: 2.58

A convenience macro to allocate reference counted data with the size of the given type, and set its contents to zero.

since: 2.58

Declare a GRecMutexLocker variable with g_autoptr() and lock the mutex. The mutex will be unlocked automatically when leaving the scope. The variable is declared with G_GNUC_UNUSED to avoid compiler warning if it is not used in the scope.

since: 2.80.0

Reallocates the memory pointed to by mem, so that it now has space for n_structs elements of type struct_type. It returns the new address of the memory, which may have been moved. Care is taken to avoid overflow when calculating the size of the allocated block.

Declare a GRWLockReaderLocker variable with g_autoptr() and lock for reading. The mutex will be unlocked automatically when leaving the scope. The variable is declared with G_GNUC_UNUSED to avoid compiler warning if it is not used in the scope.

since: 2.80.0

Declare a GRWLockWriterLocker variable with g_autoptr() and lock for writing. The mutex will be unlocked automatically when leaving the scope. The variable is declared with G_GNUC_UNUSED to avoid compiler warning if it is not used in the scope.

since: 2.80.0

Adds a symbol to the default scope.

deprecated: 2.2 

Calls a function for each symbol in the default scope.

deprecated: 2.2 

There is no reason to use this macro, since it does nothing.

deprecated: 2.2 

Removes a symbol from the default scope.

deprecated: 2.2 

There is no reason to use this macro, since it does nothing.

deprecated: 2.2 

Performs a checked addition of a and b, storing the result in dest.

since: 2.48

Performs a checked multiplication of a and b, storing the result in dest.

since: 2.48

Returns the size of member in the struct definition without having a declared instance of struct_type.

since: 2.64

A convenience macro to duplicate a block of memory using the slice allocator.

since: 2.14

A convenience macro to free a block of memory that has been allocated from the slice allocator.

since: 2.10

Frees a linked list of memory blocks of structure type type.

since: 2.10

A convenience macro to allocate a block of memory from the slice allocator.

since: 2.10

A convenience macro to allocate a block of memory from the slice allocator and set the memory to 0.

since: 2.10

A convenience macro to get the next element in a GSList. Note that it is considered perfectly acceptable to access slist->next directly.

Cast a function pointer to a GSourceFunc, suppressing warnings from GCC 8 onwards with -Wextra or -Wcast-function-type enabled about the function types being incompatible.

since: 2.58

The G_STATIC_ASSERT() macro lets the programmer check a condition at compile time, the condition needs to be compile time computable. The macro can be used in any place where a typedef is valid.

since: 2.20

The G_STATIC_ASSERT_EXPR() macro lets the programmer check a condition at compile time. The condition needs to be compile time computable.

since: 2.30

Works like g_mutex_lock(), but for a GStaticMutex.

deprecated: 2.32 

Works like g_mutex_trylock(), but for a GStaticMutex.

deprecated: 2.32 

Works like g_mutex_unlock(), but for a GStaticMutex.

deprecated: 2.32 

Accepts a macro or a string and converts it into a string after preprocessor argument expansion. For example, the following code:.

Removes leading and trailing whitespace from a string.

Returns a member of a structure at a given offset, using the given type.

Returns an untyped pointer to a given offset of a struct.

Returns the offset, in bytes, of a member of a struct.

Hooks up a new test case at testpath.

since: 2.16

Asserts that all messages previously indicated via g_test_expect_message() have been seen and suppressed.

since: 2.34

Returns true if g_test_init() has been called.

since: 2.36

Returns true if tests are run in performance mode.

Enqueue an object to be released with g_object_unref() during the next teardown phase.

since: 2.16

Returns true if tests are run in quick mode.

Returns true if tests are run in quiet mode.

Get a reproducible random bit (0 or 1).

since: 2.16

Returns true if tests are run in slow mode.

Returns true if tests are run in thorough mode.

Assert that the last test subprocess failed.

since: 2.16

Assert that the last test subprocess passed.

since: 2.16

Assert that the stderr output of the last test subprocess matches serrpattern.

since: 2.16

Assert that the stderr output of the last test subprocess does not match serrpattern.

since: 2.16

Assert that the stdout output of the last test subprocess matches soutpattern.

since: 2.16

Assert that the stdout output of the last test subprocess does not match soutpattern.

since: 2.16

Returns true if tests may provoke assertions and other formally-undefined behaviour, to verify that appropriate warnings are given.

Returns true if tests are run in verbose mode.

This macro returns TRUE if the thread system is initialized, and FALSE if it is not.

Attempts to allocate n_structs elements of type struct_type, and returns NULL on failure. Contrast with g_new(), which aborts the program on failure. The returned pointer is cast to a pointer to the given type. The function returns NULL when n_structs is 0 of if an overflow occurs.

since: 2.8

Attempts to allocate n_structs elements of type struct_type, initialized to 0’s, and returns NULL on failure. Contrast with g_new0(), which aborts the program on failure. The returned pointer is cast to a pointer to the given type. The function returns NULL when n_structs is 0 or if an overflow occurs.

since: 2.8

Attempts to reallocate the memory pointed to by mem, so that it now has space for n_structs elements of type struct_type, and returns NULL on failure. Contrast with g_renew(), which aborts the program on failure. It returns the new address of the memory, which may have been moved. The function returns NULL if an overflow occurs.

since: 2.8

Works like g_mutex_trylock(), but for a lock defined with G_LOCK_DEFINE.

Performs a checked addition of a and b, storing the result in dest.

since: 2.48

Performs a checked multiplication of a and b, storing the result in dest.

since: 2.48

Performs a checked addition of a and b, storing the result in dest.

since: 2.48