* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
- * Public License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
- * Boston, MA 02111-1307, USA.
+ * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Author: Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
+#include <string.h>
#include "goutputstream.h"
#include "gcancellable.h"
#include "gasyncresult.h"
*
* Virtual: write_fn
*
- * Return value: Number of bytes written, or -1 on error
+ * Returns: Number of bytes written, or -1 on error
**/
gssize
g_output_stream_write (GOutputStream *stream,
* is set to @count.
*
* If there is an error during the operation %FALSE is returned and @error
- * is set to indicate the error status, @bytes_written is updated to contain
- * the number of bytes written into the stream before the error occurred.
+ * is set to indicate the error status.
*
- * Return value: %TRUE on success, %FALSE if there was an error
+ * As a special exception to the normal conventions for functions that
+ * use #GError, if this function returns %FALSE (and sets @error) then
+ * @bytes_written will be set to the number of bytes that were
+ * successfully written before the error was encountered. This
+ * functionality is only available from C. If you need it from another
+ * language then you must write your own loop around
+ * g_output_stream_write().
+ *
+ * Returns: %TRUE on success, %FALSE if there was an error
**/
gboolean
g_output_stream_write_all (GOutputStream *stream,
}
/**
- * g_output_stream_write_bytes:
+ * g_output_stream_printf:
* @stream: a #GOutputStream.
- * @bytes: the #GBytes to write
- * @cancellable: (allow-none): optional cancellable object
+ * @bytes_written: (out): location to store the number of bytes that was
+ * written to the stream
+ * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
* @error: location to store the error occurring, or %NULL to ignore
+ * @format: the format string. See the printf() documentation
+ * @...: the parameters to insert into the format string
*
- * Tries to write the data from @bytes into the stream. Will block
- * during the operation.
+ * This is a utility function around g_output_stream_write_all(). It
+ * uses g_strdup_vprintf() to turn @format and @... into a string that
+ * is then written to @stream.
*
- * If @bytes is 0-length, returns 0 and does nothing. A #GBytes larger
- * than %G_MAXSSIZE will cause a %G_IO_ERROR_INVALID_ARGUMENT error.
+ * See the documentation of g_output_stream_write_all() about the
+ * behavior of the actual write operation.
*
- * 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
- * the size of @bytes is 0).
+ * Note that partial writes cannot be properly checked with this
+ * function due to the variable length of the written string, if you
+ * need precise control over partial write failures, you need to
+ * create you own printf()-like wrapper around g_output_stream_write()
+ * or g_output_stream_write_all().
*
- * 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.
+ * Since: 2.40
*
- * On error -1 is returned and @error is set accordingly.
+ * Returns: %TRUE on success, %FALSE if there was an error
+ **/
+gboolean
+g_output_stream_printf (GOutputStream *stream,
+ gsize *bytes_written,
+ GCancellable *cancellable,
+ GError **error,
+ const gchar *format,
+ ...)
+{
+ va_list args;
+ gboolean success;
+
+ va_start (args, format);
+ success = g_output_stream_vprintf (stream, bytes_written, cancellable,
+ error, format, args);
+ va_end (args);
+
+ return success;
+}
+
+/**
+ * g_output_stream_vprintf:
+ * @stream: a #GOutputStream.
+ * @bytes_written: (out): location to store the number of bytes that was
+ * written to the stream
+ * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @error: location to store the error occurring, or %NULL to ignore
+ * @format: the format string. See the printf() documentation
+ * @args: the parameters to insert into the format string
+ *
+ * This is a utility function around g_output_stream_write_all(). It
+ * uses g_strdup_vprintf() to turn @format and @args into a string that
+ * is then written to @stream.
+ *
+ * See the documentation of g_output_stream_write_all() about the
+ * behavior of the actual write operation.
+ *
+ * Note that partial writes cannot be properly checked with this
+ * function due to the variable length of the written string, if you
+ * need precise control over partial write failures, you need to
+ * create you own printf()-like wrapper around g_output_stream_write()
+ * or g_output_stream_write_all().
+ *
+ * Since: 2.40
+ *
+ * Returns: %TRUE on success, %FALSE if there was an error
+ **/
+gboolean
+g_output_stream_vprintf (GOutputStream *stream,
+ gsize *bytes_written,
+ GCancellable *cancellable,
+ GError **error,
+ const gchar *format,
+ va_list args)
+{
+ gchar *text;
+ gboolean success;
+
+ g_return_val_if_fail (G_IS_OUTPUT_STREAM (stream), FALSE);
+ g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (stream), FALSE);
+ g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+ g_return_val_if_fail (format != NULL, FALSE);
+
+ text = g_strdup_vprintf (format, args);
+ success = g_output_stream_write_all (stream,
+ text, strlen (text),
+ bytes_written, cancellable, error);
+ g_free (text);
+
+ return success;
+}
+
+/**
+ * g_output_stream_write_bytes:
+ * @stream: a #GOutputStream.
+ * @bytes: the #GBytes to write
+ * @cancellable: (allow-none): optional cancellable object
+ * @error: location to store the error occurring, or %NULL to ignore
+ *
+ * A wrapper function for g_output_stream_write() which takes a
+ * #GBytes as input. This can be more convenient for use by language
+ * bindings or in other cases where the refcounted nature of #GBytes
+ * is helpful over a bare pointer interface.
+ *
+ * However, note that this function may still perform partial writes,
+ * just like g_output_stream_write(). If that occurs, to continue
+ * writing, you will need to create a new #GBytes containing just the
+ * remaining bytes, using g_bytes_new_from_bytes(). Passing the same
+ * #GBytes instance multiple times potentially can result in duplicated
+ * data in the output stream.
*
- * Return value: Number of bytes written, or -1 on error
+ * Returns: Number of bytes written, or -1 on error
**/
gssize
g_output_stream_write_bytes (GOutputStream *stream,
* triggering the cancellable object from another thread. If the operation
* was cancelled, the error %G_IO_ERROR_CANCELLED will be returned.
*
- * Return value: %TRUE on success, %FALSE on error
+ * Returns: %TRUE on success, %FALSE on error
**/
gboolean
g_output_stream_flush (GOutputStream *stream,
* cancellation (as with any error) there is no guarantee that all written
* data will reach the target.
*
- * Return value: %TRUE on success, %FALSE on failure
+ * Returns: %TRUE on success, %FALSE on failure
**/
gboolean
g_output_stream_close (GOutputStream *stream,
*
* For the synchronous, blocking version of this function, see
* g_output_stream_write().
- **/
+ *
+ * Note that no copy of @buffer will be made, so it must stay valid
+ * until @callback is called. See g_output_stream_write_bytes_async()
+ * for a #GBytes version that will automatically hold a reference to
+ * the contents (without copying) for the duration of the call.
+ */
void
g_output_stream_write_async (GOutputStream *stream,
const void *buffer,
return g_task_propagate_int (G_TASK (result), error);
}
+typedef struct
+{
+ const guint8 *buffer;
+ gsize to_write;
+ gsize bytes_written;
+} AsyncWriteAll;
+
+static void
+free_async_write_all (gpointer data)
+{
+ g_slice_free (AsyncWriteAll, data);
+}
+
+static void
+write_all_callback (GObject *stream,
+ GAsyncResult *result,
+ gpointer user_data)
+{
+ GTask *task = user_data;
+ AsyncWriteAll *data = g_task_get_task_data (task);
+
+ if (result)
+ {
+ GError *error = NULL;
+ gssize nwritten;
+
+ nwritten = g_output_stream_write_finish (G_OUTPUT_STREAM (stream), result, &error);
+
+ if (nwritten == -1)
+ {
+ g_task_return_error (task, error);
+ g_object_unref (task);
+ return;
+ }
+
+ g_assert_cmpint (nwritten, <=, data->to_write);
+ g_warn_if_fail (nwritten > 0);
+
+ data->to_write -= nwritten;
+ data->bytes_written += nwritten;
+ }
+
+ if (data->to_write == 0)
+ {
+ g_task_return_boolean (task, TRUE);
+ g_object_unref (task);
+ }
+
+ else
+ g_output_stream_write_async (G_OUTPUT_STREAM (stream),
+ data->buffer + data->bytes_written,
+ data->to_write,
+ g_task_get_priority (task),
+ g_task_get_cancellable (task),
+ write_all_callback, task);
+}
+
+static void
+write_all_async_thread (GTask *task,
+ gpointer source_object,
+ gpointer task_data,
+ GCancellable *cancellable)
+{
+ GOutputStream *stream = source_object;
+ AsyncWriteAll *data = task_data;
+ GError *error = NULL;
+
+ if (g_output_stream_write_all (stream, data->buffer, data->to_write, &data->bytes_written,
+ g_task_get_cancellable (task), &error))
+ g_task_return_boolean (task, TRUE);
+ else
+ g_task_return_error (task, error);
+}
+
+/**
+ * g_output_stream_write_all_async:
+ * @stream: A #GOutputStream
+ * @buffer: (array length=count) (element-type guint8): the buffer containing the data to write
+ * @count: the number of bytes to write
+ * @io_priority: the io priority of the request
+ * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
+ * @callback: (scope async): callback to call when the request is satisfied
+ * @user_data: (closure): the data to pass to callback function
+ *
+ * Request an asynchronous write of @count bytes from @buffer into
+ * the stream. When the operation is finished @callback will be called.
+ * You can then call g_output_stream_write_all_finish() to get the result of the
+ * operation.
+ *
+ * This is the asynchronous version of g_output_stream_write_all().
+ *
+ * Call g_output_stream_write_all_finish() to collect the result.
+ *
+ * Any outstanding I/O request with higher priority (lower numerical
+ * value) will be executed before an outstanding request with lower
+ * priority. Default priority is %G_PRIORITY_DEFAULT.
+ *
+ * Note that no copy of @buffer will be made, so it must stay valid
+ * until @callback is called.
+ *
+ * Since: 2.44
+ */
+void
+g_output_stream_write_all_async (GOutputStream *stream,
+ const void *buffer,
+ gsize count,
+ int io_priority,
+ GCancellable *cancellable,
+ GAsyncReadyCallback callback,
+ gpointer user_data)
+{
+ AsyncWriteAll *data;
+ GTask *task;
+
+ g_return_if_fail (G_IS_OUTPUT_STREAM (stream));
+ g_return_if_fail (buffer != NULL || count == 0);
+
+ task = g_task_new (stream, cancellable, callback, user_data);
+ data = g_slice_new0 (AsyncWriteAll);
+ data->buffer = buffer;
+ data->to_write = count;
+
+ g_task_set_task_data (task, data, free_async_write_all);
+ g_task_set_priority (task, io_priority);
+
+ /* If async writes are going to be handled via the threadpool anyway
+ * then we may as well do it with a single dispatch instead of
+ * bouncing in and out.
+ */
+ if (g_output_stream_async_write_is_via_threads (stream))
+ {
+ g_task_run_in_thread (task, write_all_async_thread);
+ g_object_unref (task);
+ }
+ else
+ write_all_callback (G_OBJECT (stream), NULL, task);
+}
+
+/**
+ * g_output_stream_write_all_finish:
+ * @stream: a #GOutputStream
+ * @result: a #GAsyncResult
+ * @bytes_written: (out): location to store the number of bytes that was written to the stream
+ * @error: a #GError location to store the error occurring, or %NULL to ignore.
+ *
+ * Finishes an asynchronous stream write operation started with
+ * g_output_stream_write_all_async().
+ *
+ * As a special exception to the normal conventions for functions that
+ * use #GError, if this function returns %FALSE (and sets @error) then
+ * @bytes_written will be set to the number of bytes that were
+ * successfully written before the error was encountered. This
+ * functionality is only available from C. If you need it from another
+ * language then you must write your own loop around
+ * g_output_stream_write_async().
+ *
+ * Returns: %TRUE on success, %FALSE if there was an error
+ *
+ * Since: 2.44
+ **/
+gboolean
+g_output_stream_write_all_finish (GOutputStream *stream,
+ GAsyncResult *result,
+ gsize *bytes_written,
+ GError **error)
+{
+ GTask *task;
+
+ g_return_val_if_fail (G_IS_OUTPUT_STREAM (stream), FALSE);
+ g_return_val_if_fail (g_task_is_valid (result, stream), FALSE);
+
+ task = G_TASK (result);
+
+ if (bytes_written)
+ {
+ AsyncWriteAll *data = (AsyncWriteAll *)g_task_get_task_data (task);
+
+ *bytes_written = data->bytes_written;
+ }
+
+ return g_task_propagate_boolean (task, error);
+}
+
static void
write_bytes_callback (GObject *stream,
GAsyncResult *result,
* @callback: (scope async): callback to call when the request is satisfied
* @user_data: (closure): the data to pass to callback function
*
- * Request an asynchronous write of the data in @bytes to the stream.
- * When the operation is finished @callback will be called. You can
- * then call g_output_stream_write_bytes_finish() to get the result of
- * the operation.
- *
- * During an async request no other sync and async calls are allowed,
- * and will result in %G_IO_ERROR_PENDING errors.
- *
- * A #GBytes larger than %G_MAXSSIZE will cause a
- * %G_IO_ERROR_INVALID_ARGUMENT error.
- *
- * On success, the number of bytes written will be passed to the
- * @callback. 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,
- * but generally we try to write as many bytes as requested.
- *
- * You are guaranteed that this method will never fail with
- * %G_IO_ERROR_WOULD_BLOCK - if @stream can't accept more data, the
- * method will just wait until this changes.
+ * This function is similar to g_output_stream_write_async(), but
+ * takes a #GBytes as input. Due to the refcounted nature of #GBytes,
+ * this allows the stream to avoid taking a copy of the data.
*
- * Any outstanding I/O request with higher priority (lower numerical
- * value) will be executed before an outstanding request with lower
- * priority. Default priority is %G_PRIORITY_DEFAULT.
+ * However, note that this function may still perform partial writes,
+ * just like g_output_stream_write_async(). If that occurs, to continue
+ * writing, you will need to create a new #GBytes containing just the
+ * remaining bytes, using g_bytes_new_from_bytes(). Passing the same
+ * #GBytes instance multiple times potentially can result in duplicated
+ * data in the output stream.
*
* For the synchronous, blocking version of this function, see
* g_output_stream_write_bytes().
* already set or @stream is closed, it will return %FALSE and set
* @error.
*
- * Return value: %TRUE if pending was previously unset and is now set.
+ * Returns: %TRUE if pending was previously unset and is now set.
**/
gboolean
g_output_stream_set_pending (GOutputStream *stream,
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