quorum: Avoid bdrv_aio_writev() for rewrites
[qemu.git] / io / channel-util.c
1 /*
2 * QEMU I/O channels utility APIs
3 *
4 * Copyright (c) 2016 Red Hat, Inc.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 *
19 */
20
21 #include "qemu/osdep.h"
22 #include "io/channel-util.h"
23 #include "io/channel-file.h"
24 #include "io/channel-socket.h"
25
26
27 static bool fd_is_socket(int fd)
28 {
29 int optval;
30 socklen_t optlen;
31 optlen = sizeof(optval);
32 return qemu_getsockopt(fd,
33 SOL_SOCKET,
34 SO_TYPE,
35 (char *)&optval,
36 &optlen) == 0;
37 }
38
39
40 QIOChannel *qio_channel_new_fd(int fd,
41 Error **errp)
42 {
43 QIOChannel *ioc;
44
45 if (fd_is_socket(fd)) {
46 ioc = QIO_CHANNEL(qio_channel_socket_new_fd(fd, errp));
47 } else {
48 ioc = QIO_CHANNEL(qio_channel_file_new_fd(fd));
49 }
50 return ioc;
51 }