g_mapped_file_new (
  const gchar* filename,
  gboolean writable,
  GError** error


Maps a file into memory. On UNIX, this is using the mmap() function.

If writable is TRUE, the mapped buffer may be modified, otherwise it is an error to modify the mapped buffer. Modifications to the buffer are not visible to other processes mapping the same file, and are not written back to the file.

Note that modifications of the underlying file might affect the contents of the GMappedFile. Therefore, mapping should only be used if the file will not be modified, or if all modifications of the file are done atomically (e.g. using g_file_set_contents()).

If filename is the name of an empty, regular file, the function will successfully return an empty GMappedFile. In other cases of size 0 (e.g. device files such as /dev/null), error will be set to the GFileError value G_FILE_ERROR_INVAL.

Available since:2.8


filename const gchar*

The path of the file to load, in the GLib filename encoding.

 The data is owned by the caller of the function.
 The value is a file system path, using the OS encoding.
writable gboolean

Whether the mapping should be writable.

error GError **
  The return location for a GError*, or NULL.

Return value

Returns: GMappedFile

A newly allocated GMappedFile which must be unref’d with g_mapped_file_unref(), or NULL if the mapping failed.

 The caller of the function takes ownership of the data, and is responsible for freeing it.