since: 2.60


g_pollable_output_stream_writev_nonblocking (
  GPollableOutputStream* stream,
  const GOutputVector* vectors,
  gsize n_vectors,
  gsize* bytes_written,
  GCancellable* cancellable,
  GError** error


Attempts to write the bytes contained in the n_vectors vectors to stream, as with g_output_stream_writev(). If stream is not currently writable, this will immediately return %G_POLLABLE_RETURN_WOULD_BLOCK, and you can use g_pollable_output_stream_create_source() to create a GSource that will be triggered when stream is writable. error will not be set in that case.

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_POLLABLE_RETURN_WOULD_BLOCK is returned some underlying transports like D/TLS require that you re-send the same vectors and n_vectors in the next write call.

The behaviour of this method is undefined if g_pollable_output_stream_can_poll() returns FALSE for stream.

Available since: 2.60



Type: An array of GOutputVector

The buffer containing the GOutputVectors to write.

The length of the array is specified in the n_vectors argument.
The data is owned by the caller of the function.

Type: gsize

The number of vectors to write.


Type: gsize*

Location to store the number of bytes that were written to the stream.

The argument will be set by the function.
The argument can be NULL.

Type: GCancellable

A GCancellable, or NULL.

The argument can be NULL.
The data is owned by the caller of the function.

Type: GError **

The return location for a recoverable error.

The argument can be NULL.
If the return location is not NULL, then you must initialize it to a NULL GError*.
The argument will left initialized to NULL by the method if there are no errors.
In case of error, the argument will be set to a newly allocated GError; the caller will take ownership of the data, and be responsible for freeing it.

Return value

Type: GPollableReturn

%G_POLLABLE_RETURN_OK on success, G_POLLABLE_RETURN_WOULD_BLOCK if the stream is not currently writable (and error is not set), or G_POLLABLE_RETURN_FAILED if there was an error in which case error will be set.