Method

GioPollableInputStreamread_nonblocking

Declaration

gssize
g_pollable_input_stream_read_nonblocking (
  GPollableInputStream* stream,
  void* buffer,
  gsize count,
  GCancellable* cancellable,
  GError** error
)

Description

Attempts to read up to count bytes from stream into buffer, as with g_input_stream_read(). If stream is not currently readable, this will immediately return G_IO_ERROR_WOULD_BLOCK, and you can use g_pollable_input_stream_create_source() to create a GSource that will be triggered when stream is readable.

Note that since this method never blocks, you cannot actually use cancellable to cancel it. However, it will return an error if cancellable has already been cancelled when you call, which may happen if you call this method after a source triggers due to having been cancelled.

Parameters

buffer An array of guint8
 

A buffer to read data into (which should be at least count bytes long).

 The argument will be set by the function.
 The length of the array is specified in the count argument.
 The data is owned by the caller of the function.
count gsize
 

The number of bytes you want to read.

cancellable GCancellable
 

A GCancellable, or NULL.

 The argument can be NULL.
 The data is owned by the caller of the function.
error GError **
  The return location for a GError*, or NULL.

Return value

Returns: gssize
 

The number of bytes read, or -1 on error (including G_IO_ERROR_WOULD_BLOCK).