1/* Linux implementation of pwritev2.
2 Copyright (C) 2017-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C 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 The GNU C 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 Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <sys/uio.h>
20#include <sysdep-cancel.h>
21
22#ifndef __OFF_T_MATCHES_OFF64_T
23
24ssize_t
25pwritev2 (int fd, const struct iovec *vector, int count, off_t offset,
26 int flags)
27{
28
29 ssize_t result = SYSCALL_CANCEL (pwritev2, fd, vector, count,
30 LO_HI_LONG (offset), flags);
31 if (result >= 0 || errno != ENOSYS)
32 return result;
33
34 /* Trying to emulate the pwritev2 syscall flags is troublesome:
35
36 * We can not temporary change the file state of the O_DSYNC and O_SYNC
37 flags to emulate RWF_{D}SYNC (attempts to change the state of using
38 fcntl are silently ignored).
39
40 * IOCB_HIPRI requires the file opened in O_DIRECT and uses an internal
41 semantic not provided by any other flag (O_NONBLOCK for instance). */
42
43 if (flags != 0)
44 {
45 __set_errno (ENOTSUP);
46 return -1;
47 }
48 if (offset == -1)
49 return __writev (fd, vector, count);
50 else
51 return pwritev (fd, vector, count, offset);
52}
53
54#endif
55