g_pollable_output_stream_write_nonblocking (
  GPollableOutputStream* stream,
  void* buffer,
  gsize count,
  GCancellable* cancellable,
  GError** error


Attempts to write up to count bytes from buffer to stream, as with g_output_stream_write(). If stream is not currently writable, this will immediately return G_IO_ERROR_WOULD_BLOCK, and you can use g_pollable_output_stream_create_source() to create a GSource that will be triggered when stream is writable.

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.

Also note that if G_IO_ERROR_WOULD_BLOCK is returned some underlying transports like D/TLS require that you re-send the same buffer and count in the next write call.


buffer An array of guint8

A buffer to write data from.

 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 write.

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 written, or -1 on error (including G_IO_ERROR_WOULD_BLOCK).