Virtual Method


since: 2.60


writev_fn (
  GOutputStream* stream,
  const GOutputVector* vectors,
  gsize n_vectors,
  gsize* bytes_written,
  GCancellable* cancellable,
  GError** error


Tries to write the bytes contained in the n_vectors vectors into the stream. Will block during the operation.

If n_vectors is 0 or the sum of all bytes in vectors is 0, returns 0 and does nothing.

On success, the number of bytes written to the stream is returned. It is not an error if this is not the same as the requested size, as it can happen e.g. on a partial I/O error, or if there is not enough storage in the stream. All writes block until at least one byte is written or an error occurs; 0 is never returned (unless n_vectors is 0 or the sum of all bytes in vectors is 0).

If cancellable is not NULL, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error G_IO_ERROR_CANCELLED will be returned. If an operation was partially finished when the operation was cancelled the partial result will be returned, without an error.

Some implementations of g_output_stream_writev() may have limitations on the aggregate buffer size, and will return G_IO_ERROR_INVALID_ARGUMENT if these are exceeded. For example, when writing to a local file on UNIX platforms, the aggregate buffer size must not exceed G_MAXSSIZE bytes.

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

Optional cancellable object.

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 virtual function 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: gboolean

TRUE on success, FALSE if there was an error.