1 /* GIO - GLib Input, Output and Streaming Library
2 *
3 * Copyright (C) 2006-2007 Red Hat, Inc.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General
16 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
17 *
18 * Author: Alexander Larsson <alexl@redhat.com>
19 */
20
21 #include "config.h"
22
23 #include <sys/types.h>
24 #include <sys/stat.h>
25 #include <unistd.h>
26 #include <errno.h>
27 #include <stdio.h>
28 #include <fcntl.h>
29 #include <sys/uio.h>
30
31 #include <glib.h>
32 #include <glib/gstdio.h>
33 #include <glib/glib-unix.h>
34 #include "gioerror.h"
35 #include "gunixoutputstream.h"
36 #include "gcancellable.h"
37 #include "gasynchelper.h"
38 #include "gfiledescriptorbased.h"
39 #include "glibintl.h"
40 #include "gioprivate.h"
41
42
43 /**
44 * SECTION:gunixoutputstream
45 * @short_description: Streaming output operations for UNIX file descriptors
46 * @include: gio/gunixoutputstream.h
47 * @see_also: #GOutputStream
48 *
49 * #GUnixOutputStream implements #GOutputStream for writing to a UNIX
50 * file descriptor, including asynchronous operations. (If the file
51 * descriptor refers to a socket or pipe, this will use poll() to do
52 * asynchronous I/O. If it refers to a regular file, it will fall back
53 * to doing asynchronous I/O in another thread.)
54 *
55 * Note that `<gio/gunixoutputstream.h>` belongs to the UNIX-specific GIO
56 * interfaces, thus you have to use the `gio-unix-2.0.pc` pkg-config file
57 * when using it.
58 */
59
60 enum {
61 PROP_0,
62 PROP_FD,
63 PROP_CLOSE_FD
64 };
65
66 struct _GUnixOutputStreamPrivate {
67 int fd;
68 guint close_fd : 1;
69 guint is_pipe_or_socket : 1;
70 };
71
72 static void g_unix_output_stream_pollable_iface_init (GPollableOutputStreamInterface *iface);
73 static void g_unix_output_stream_file_descriptor_based_iface_init (GFileDescriptorBasedIface *iface);
74
75 G_DEFINE_TYPE_WITH_CODE (GUnixOutputStream, g_unix_output_stream, G_TYPE_OUTPUT_STREAM,
76 G_ADD_PRIVATE (GUnixOutputStream)
77 G_IMPLEMENT_INTERFACE (G_TYPE_POLLABLE_OUTPUT_STREAM,
78 g_unix_output_stream_pollable_iface_init)
79 G_IMPLEMENT_INTERFACE (G_TYPE_FILE_DESCRIPTOR_BASED,
80 g_unix_output_stream_file_descriptor_based_iface_init)
81 )
82
83 static void g_unix_output_stream_set_property (GObject *object,
84 guint prop_id,
85 const GValue *value,
86 GParamSpec *pspec);
87 static void g_unix_output_stream_get_property (GObject *object,
88 guint prop_id,
89 GValue *value,
90 GParamSpec *pspec);
91 static gssize g_unix_output_stream_write (GOutputStream *stream,
92 const void *buffer,
93 gsize count,
94 GCancellable *cancellable,
95 GError **error);
96 static gboolean g_unix_output_stream_writev (GOutputStream *stream,
97 const GOutputVector *vectors,
98 gsize n_vectors,
99 gsize *bytes_written,
100 GCancellable *cancellable,
101 GError **error);
102 static gboolean g_unix_output_stream_close (GOutputStream *stream,
103 GCancellable *cancellable,
104 GError **error);
105 static void g_unix_output_stream_close_async (GOutputStream *stream,
106 int io_priority,
107 GCancellable *cancellable,
108 GAsyncReadyCallback callback,
109 gpointer data);
110 static gboolean g_unix_output_stream_close_finish (GOutputStream *stream,
111 GAsyncResult *result,
112 GError **error);
113
114 static gboolean g_unix_output_stream_pollable_can_poll (GPollableOutputStream *stream);
115 static gboolean g_unix_output_stream_pollable_is_writable (GPollableOutputStream *stream);
116 static GSource *g_unix_output_stream_pollable_create_source (GPollableOutputStream *stream,
117 GCancellable *cancellable);
118 static GPollableReturn g_unix_output_stream_pollable_writev_nonblocking (GPollableOutputStream *stream,
119 const GOutputVector *vectors,
120 gsize n_vectors,
121 gsize *bytes_written,
122 GError **error);
123
124 static void
g_unix_output_stream_class_init(GUnixOutputStreamClass * klass)125 g_unix_output_stream_class_init (GUnixOutputStreamClass *klass)
126 {
127 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
128 GOutputStreamClass *stream_class = G_OUTPUT_STREAM_CLASS (klass);
129
130 gobject_class->get_property = g_unix_output_stream_get_property;
131 gobject_class->set_property = g_unix_output_stream_set_property;
132
133 stream_class->write_fn = g_unix_output_stream_write;
134 stream_class->writev_fn = g_unix_output_stream_writev;
135 stream_class->close_fn = g_unix_output_stream_close;
136 stream_class->close_async = g_unix_output_stream_close_async;
137 stream_class->close_finish = g_unix_output_stream_close_finish;
138
139 /**
140 * GUnixOutputStream:fd:
141 *
142 * The file descriptor that the stream writes to.
143 *
144 * Since: 2.20
145 */
146 g_object_class_install_property (gobject_class,
147 PROP_FD,
148 g_param_spec_int ("fd",
149 P_("File descriptor"),
150 P_("The file descriptor to write to"),
151 G_MININT, G_MAXINT, -1,
152 G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK | G_PARAM_STATIC_BLURB));
153
154 /**
155 * GUnixOutputStream:close-fd:
156 *
157 * Whether to close the file descriptor when the stream is closed.
158 *
159 * Since: 2.20
160 */
161 g_object_class_install_property (gobject_class,
162 PROP_CLOSE_FD,
163 g_param_spec_boolean ("close-fd",
164 P_("Close file descriptor"),
165 P_("Whether to close the file descriptor when the stream is closed"),
166 TRUE,
167 G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK | G_PARAM_STATIC_BLURB));
168 }
169
170 static void
g_unix_output_stream_pollable_iface_init(GPollableOutputStreamInterface * iface)171 g_unix_output_stream_pollable_iface_init (GPollableOutputStreamInterface *iface)
172 {
173 iface->can_poll = g_unix_output_stream_pollable_can_poll;
174 iface->is_writable = g_unix_output_stream_pollable_is_writable;
175 iface->create_source = g_unix_output_stream_pollable_create_source;
176 iface->writev_nonblocking = g_unix_output_stream_pollable_writev_nonblocking;
177 }
178
179 static void
g_unix_output_stream_file_descriptor_based_iface_init(GFileDescriptorBasedIface * iface)180 g_unix_output_stream_file_descriptor_based_iface_init (GFileDescriptorBasedIface *iface)
181 {
182 iface->get_fd = (int (*) (GFileDescriptorBased *))g_unix_output_stream_get_fd;
183 }
184
185 static void
g_unix_output_stream_set_property(GObject * object,guint prop_id,const GValue * value,GParamSpec * pspec)186 g_unix_output_stream_set_property (GObject *object,
187 guint prop_id,
188 const GValue *value,
189 GParamSpec *pspec)
190 {
191 GUnixOutputStream *unix_stream;
192
193 unix_stream = G_UNIX_OUTPUT_STREAM (object);
194
195 switch (prop_id)
196 {
197 case PROP_FD:
198 unix_stream->priv->fd = g_value_get_int (value);
199 if (lseek (unix_stream->priv->fd, 0, SEEK_CUR) == -1 && errno == ESPIPE)
200 unix_stream->priv->is_pipe_or_socket = TRUE;
201 else
202 unix_stream->priv->is_pipe_or_socket = FALSE;
203 break;
204 case PROP_CLOSE_FD:
205 unix_stream->priv->close_fd = g_value_get_boolean (value);
206 break;
207 default:
208 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
209 break;
210 }
211 }
212
213 static void
g_unix_output_stream_get_property(GObject * object,guint prop_id,GValue * value,GParamSpec * pspec)214 g_unix_output_stream_get_property (GObject *object,
215 guint prop_id,
216 GValue *value,
217 GParamSpec *pspec)
218 {
219 GUnixOutputStream *unix_stream;
220
221 unix_stream = G_UNIX_OUTPUT_STREAM (object);
222
223 switch (prop_id)
224 {
225 case PROP_FD:
226 g_value_set_int (value, unix_stream->priv->fd);
227 break;
228 case PROP_CLOSE_FD:
229 g_value_set_boolean (value, unix_stream->priv->close_fd);
230 break;
231 default:
232 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
233 }
234 }
235
236 static void
g_unix_output_stream_init(GUnixOutputStream * unix_stream)237 g_unix_output_stream_init (GUnixOutputStream *unix_stream)
238 {
239 unix_stream->priv = g_unix_output_stream_get_instance_private (unix_stream);
240 unix_stream->priv->fd = -1;
241 unix_stream->priv->close_fd = TRUE;
242 }
243
244 /**
245 * g_unix_output_stream_new:
246 * @fd: a UNIX file descriptor
247 * @close_fd: %TRUE to close the file descriptor when done
248 *
249 * Creates a new #GUnixOutputStream for the given @fd.
250 *
251 * If @close_fd, is %TRUE, the file descriptor will be closed when
252 * the output stream is destroyed.
253 *
254 * Returns: a new #GOutputStream
255 **/
256 GOutputStream *
g_unix_output_stream_new(gint fd,gboolean close_fd)257 g_unix_output_stream_new (gint fd,
258 gboolean close_fd)
259 {
260 GUnixOutputStream *stream;
261
262 g_return_val_if_fail (fd != -1, NULL);
263
264 stream = g_object_new (G_TYPE_UNIX_OUTPUT_STREAM,
265 "fd", fd,
266 "close-fd", close_fd,
267 NULL);
268
269 return G_OUTPUT_STREAM (stream);
270 }
271
272 /**
273 * g_unix_output_stream_set_close_fd:
274 * @stream: a #GUnixOutputStream
275 * @close_fd: %TRUE to close the file descriptor when done
276 *
277 * Sets whether the file descriptor of @stream shall be closed
278 * when the stream is closed.
279 *
280 * Since: 2.20
281 */
282 void
g_unix_output_stream_set_close_fd(GUnixOutputStream * stream,gboolean close_fd)283 g_unix_output_stream_set_close_fd (GUnixOutputStream *stream,
284 gboolean close_fd)
285 {
286 g_return_if_fail (G_IS_UNIX_OUTPUT_STREAM (stream));
287
288 close_fd = close_fd != FALSE;
289 if (stream->priv->close_fd != close_fd)
290 {
291 stream->priv->close_fd = close_fd;
292 g_object_notify (G_OBJECT (stream), "close-fd");
293 }
294 }
295
296 /**
297 * g_unix_output_stream_get_close_fd:
298 * @stream: a #GUnixOutputStream
299 *
300 * Returns whether the file descriptor of @stream will be
301 * closed when the stream is closed.
302 *
303 * Returns: %TRUE if the file descriptor is closed when done
304 *
305 * Since: 2.20
306 */
307 gboolean
g_unix_output_stream_get_close_fd(GUnixOutputStream * stream)308 g_unix_output_stream_get_close_fd (GUnixOutputStream *stream)
309 {
310 g_return_val_if_fail (G_IS_UNIX_OUTPUT_STREAM (stream), FALSE);
311
312 return stream->priv->close_fd;
313 }
314
315 /**
316 * g_unix_output_stream_get_fd:
317 * @stream: a #GUnixOutputStream
318 *
319 * Return the UNIX file descriptor that the stream writes to.
320 *
321 * Returns: The file descriptor of @stream
322 *
323 * Since: 2.20
324 */
325 gint
g_unix_output_stream_get_fd(GUnixOutputStream * stream)326 g_unix_output_stream_get_fd (GUnixOutputStream *stream)
327 {
328 g_return_val_if_fail (G_IS_UNIX_OUTPUT_STREAM (stream), -1);
329
330 return stream->priv->fd;
331 }
332
333 static gssize
g_unix_output_stream_write(GOutputStream * stream,const void * buffer,gsize count,GCancellable * cancellable,GError ** error)334 g_unix_output_stream_write (GOutputStream *stream,
335 const void *buffer,
336 gsize count,
337 GCancellable *cancellable,
338 GError **error)
339 {
340 GUnixOutputStream *unix_stream;
341 gssize res = -1;
342 GPollFD poll_fds[2];
343 int nfds = 0;
344 int poll_ret;
345
346 unix_stream = G_UNIX_OUTPUT_STREAM (stream);
347
348 poll_fds[0].fd = unix_stream->priv->fd;
349 poll_fds[0].events = G_IO_OUT;
350 nfds++;
351
352 if (unix_stream->priv->is_pipe_or_socket &&
353 g_cancellable_make_pollfd (cancellable, &poll_fds[1]))
354 nfds++;
355
356 while (1)
357 {
358 int errsv;
359
360 poll_fds[0].revents = poll_fds[1].revents = 0;
361 do
362 {
363 poll_ret = g_poll (poll_fds, nfds, -1);
364 errsv = errno;
365 }
366 while (poll_ret == -1 && errsv == EINTR);
367
368 if (poll_ret == -1)
369 {
370 g_set_error (error, G_IO_ERROR,
371 g_io_error_from_errno (errsv),
372 _("Error writing to file descriptor: %s"),
373 g_strerror (errsv));
374 break;
375 }
376
377 if (g_cancellable_set_error_if_cancelled (cancellable, error))
378 break;
379
380 if (!poll_fds[0].revents)
381 continue;
382
383 res = write (unix_stream->priv->fd, buffer, count);
384 errsv = errno;
385 if (res == -1)
386 {
387 if (errsv == EINTR || errsv == EAGAIN)
388 continue;
389
390 g_set_error (error, G_IO_ERROR,
391 g_io_error_from_errno (errsv),
392 _("Error writing to file descriptor: %s"),
393 g_strerror (errsv));
394 }
395
396 break;
397 }
398
399 if (nfds == 2)
400 g_cancellable_release_fd (cancellable);
401 return res;
402 }
403
404 /* Macro to check if struct iovec and GOutputVector have the same ABI */
405 #define G_OUTPUT_VECTOR_IS_IOVEC (sizeof (struct iovec) == sizeof (GOutputVector) && \
406 sizeof ((struct iovec *) 0)->iov_base == sizeof ((GOutputVector *) 0)->buffer && \
407 G_STRUCT_OFFSET (struct iovec, iov_base) == G_STRUCT_OFFSET (GOutputVector, buffer) && \
408 sizeof ((struct iovec *) 0)->iov_len == sizeof((GOutputVector *) 0)->size && \
409 G_STRUCT_OFFSET (struct iovec, iov_len) == G_STRUCT_OFFSET (GOutputVector, size))
410
411 static gboolean
g_unix_output_stream_writev(GOutputStream * stream,const GOutputVector * vectors,gsize n_vectors,gsize * bytes_written,GCancellable * cancellable,GError ** error)412 g_unix_output_stream_writev (GOutputStream *stream,
413 const GOutputVector *vectors,
414 gsize n_vectors,
415 gsize *bytes_written,
416 GCancellable *cancellable,
417 GError **error)
418 {
419 GUnixOutputStream *unix_stream;
420 gssize res = -1;
421 GPollFD poll_fds[2];
422 int nfds = 0;
423 int poll_ret;
424 struct iovec *iov;
425
426 if (bytes_written)
427 *bytes_written = 0;
428
429 /* Clamp the number of vectors if more given than we can write in one go.
430 * The caller has to handle short writes anyway.
431 */
432 if (n_vectors > G_IOV_MAX)
433 n_vectors = G_IOV_MAX;
434
435 unix_stream = G_UNIX_OUTPUT_STREAM (stream);
436
437 if (G_OUTPUT_VECTOR_IS_IOVEC)
438 {
439 /* ABI is compatible */
440 iov = (struct iovec *) vectors;
441 }
442 else
443 {
444 gsize i;
445
446 /* ABI is incompatible */
447 iov = g_newa (struct iovec, n_vectors);
448 for (i = 0; i < n_vectors; i++)
449 {
450 iov[i].iov_base = (void *)vectors[i].buffer;
451 iov[i].iov_len = vectors[i].size;
452 }
453 }
454
455 poll_fds[0].fd = unix_stream->priv->fd;
456 poll_fds[0].events = G_IO_OUT;
457 nfds++;
458
459 if (unix_stream->priv->is_pipe_or_socket &&
460 g_cancellable_make_pollfd (cancellable, &poll_fds[1]))
461 nfds++;
462
463 while (1)
464 {
465 int errsv;
466
467 poll_fds[0].revents = poll_fds[1].revents = 0;
468 do
469 {
470 poll_ret = g_poll (poll_fds, nfds, -1);
471 errsv = errno;
472 }
473 while (poll_ret == -1 && errsv == EINTR);
474
475 if (poll_ret == -1)
476 {
477 g_set_error (error, G_IO_ERROR,
478 g_io_error_from_errno (errsv),
479 _("Error writing to file descriptor: %s"),
480 g_strerror (errsv));
481 break;
482 }
483
484 if (g_cancellable_set_error_if_cancelled (cancellable, error))
485 break;
486
487 if (!poll_fds[0].revents)
488 continue;
489
490 res = writev (unix_stream->priv->fd, iov, n_vectors);
491 errsv = errno;
492 if (res == -1)
493 {
494 if (errsv == EINTR || errsv == EAGAIN)
495 continue;
496
497 g_set_error (error, G_IO_ERROR,
498 g_io_error_from_errno (errsv),
499 _("Error writing to file descriptor: %s"),
500 g_strerror (errsv));
501 }
502
503 if (bytes_written)
504 *bytes_written = res;
505
506 break;
507 }
508
509 if (nfds == 2)
510 g_cancellable_release_fd (cancellable);
511 return res != -1;
512 }
513
514 static gboolean
g_unix_output_stream_close(GOutputStream * stream,GCancellable * cancellable,GError ** error)515 g_unix_output_stream_close (GOutputStream *stream,
516 GCancellable *cancellable,
517 GError **error)
518 {
519 GUnixOutputStream *unix_stream;
520 int res;
521
522 unix_stream = G_UNIX_OUTPUT_STREAM (stream);
523
524 if (!unix_stream->priv->close_fd)
525 return TRUE;
526
527 /* This might block during the close. Doesn't seem to be a way to avoid it though. */
528 res = close (unix_stream->priv->fd);
529 if (res == -1)
530 {
531 int errsv = errno;
532
533 g_set_error (error, G_IO_ERROR,
534 g_io_error_from_errno (errsv),
535 _("Error closing file descriptor: %s"),
536 g_strerror (errsv));
537 }
538
539 return res != -1;
540 }
541
542 static void
g_unix_output_stream_close_async(GOutputStream * stream,int io_priority,GCancellable * cancellable,GAsyncReadyCallback callback,gpointer user_data)543 g_unix_output_stream_close_async (GOutputStream *stream,
544 int io_priority,
545 GCancellable *cancellable,
546 GAsyncReadyCallback callback,
547 gpointer user_data)
548 {
549 GTask *task;
550 GError *error = NULL;
551
552 task = g_task_new (stream, cancellable, callback, user_data);
553 g_task_set_source_tag (task, g_unix_output_stream_close_async);
554 g_task_set_priority (task, io_priority);
555
556 if (g_unix_output_stream_close (stream, cancellable, &error))
557 g_task_return_boolean (task, TRUE);
558 else
559 g_task_return_error (task, error);
560 g_object_unref (task);
561 }
562
563 static gboolean
g_unix_output_stream_close_finish(GOutputStream * stream,GAsyncResult * result,GError ** error)564 g_unix_output_stream_close_finish (GOutputStream *stream,
565 GAsyncResult *result,
566 GError **error)
567 {
568 g_return_val_if_fail (g_task_is_valid (result, stream), FALSE);
569
570 return g_task_propagate_boolean (G_TASK (result), error);
571 }
572
573 static gboolean
g_unix_output_stream_pollable_can_poll(GPollableOutputStream * stream)574 g_unix_output_stream_pollable_can_poll (GPollableOutputStream *stream)
575 {
576 return G_UNIX_OUTPUT_STREAM (stream)->priv->is_pipe_or_socket;
577 }
578
579 static gboolean
g_unix_output_stream_pollable_is_writable(GPollableOutputStream * stream)580 g_unix_output_stream_pollable_is_writable (GPollableOutputStream *stream)
581 {
582 GUnixOutputStream *unix_stream = G_UNIX_OUTPUT_STREAM (stream);
583 GPollFD poll_fd;
584 gint result;
585
586 poll_fd.fd = unix_stream->priv->fd;
587 poll_fd.events = G_IO_OUT;
588 poll_fd.revents = 0;
589
590 do
591 result = g_poll (&poll_fd, 1, 0);
592 while (result == -1 && errno == EINTR);
593
594 return poll_fd.revents != 0;
595 }
596
597 static GSource *
g_unix_output_stream_pollable_create_source(GPollableOutputStream * stream,GCancellable * cancellable)598 g_unix_output_stream_pollable_create_source (GPollableOutputStream *stream,
599 GCancellable *cancellable)
600 {
601 GUnixOutputStream *unix_stream = G_UNIX_OUTPUT_STREAM (stream);
602 GSource *inner_source, *cancellable_source, *pollable_source;
603
604 pollable_source = g_pollable_source_new (G_OBJECT (stream));
605
606 inner_source = g_unix_fd_source_new (unix_stream->priv->fd, G_IO_OUT);
607 g_source_set_dummy_callback (inner_source);
608 g_source_add_child_source (pollable_source, inner_source);
609 g_source_unref (inner_source);
610
611 if (cancellable)
612 {
613 cancellable_source = g_cancellable_source_new (cancellable);
614 g_source_set_dummy_callback (cancellable_source);
615 g_source_add_child_source (pollable_source, cancellable_source);
616 g_source_unref (cancellable_source);
617 }
618
619 return pollable_source;
620 }
621
622 static GPollableReturn
g_unix_output_stream_pollable_writev_nonblocking(GPollableOutputStream * stream,const GOutputVector * vectors,gsize n_vectors,gsize * bytes_written,GError ** error)623 g_unix_output_stream_pollable_writev_nonblocking (GPollableOutputStream *stream,
624 const GOutputVector *vectors,
625 gsize n_vectors,
626 gsize *bytes_written,
627 GError **error)
628 {
629 GUnixOutputStream *unix_stream = G_UNIX_OUTPUT_STREAM (stream);
630 struct iovec *iov;
631 gssize res = -1;
632
633 if (!g_pollable_output_stream_is_writable (stream))
634 {
635 *bytes_written = 0;
636 return G_POLLABLE_RETURN_WOULD_BLOCK;
637 }
638
639 /* Clamp the number of vectors if more given than we can write in one go.
640 * The caller has to handle short writes anyway.
641 */
642 if (n_vectors > G_IOV_MAX)
643 n_vectors = G_IOV_MAX;
644
645 if (G_OUTPUT_VECTOR_IS_IOVEC)
646 {
647 /* ABI is compatible */
648 iov = (struct iovec *) vectors;
649 }
650 else
651 {
652 gsize i;
653
654 /* ABI is incompatible */
655 iov = g_newa (struct iovec, n_vectors);
656 for (i = 0; i < n_vectors; i++)
657 {
658 iov[i].iov_base = (void *)vectors[i].buffer;
659 iov[i].iov_len = vectors[i].size;
660 }
661 }
662
663 while (1)
664 {
665 int errsv;
666
667 res = writev (unix_stream->priv->fd, iov, n_vectors);
668 errsv = errno;
669 if (res == -1)
670 {
671 if (errsv == EINTR)
672 continue;
673
674 g_set_error (error, G_IO_ERROR,
675 g_io_error_from_errno (errsv),
676 _("Error writing to file descriptor: %s"),
677 g_strerror (errsv));
678 }
679
680 if (bytes_written)
681 *bytes_written = res;
682
683 break;
684 }
685
686 return res != -1 ? G_POLLABLE_RETURN_OK : G_POLLABLE_RETURN_FAILED;
687 }
688