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[glibc.git] / sysdeps / unix / sysv / linux / pwrite64.c
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1 /* Copyright (C) 1997-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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.
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.
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 <http://www.gnu.org/licenses/>. */
19 #include <errno.h>
20 #include <endian.h>
21 #include <unistd.h>
23 #include <sysdep-cancel.h>
24 #include <sys/syscall.h>
26 #include <kernel-features.h>
28 #ifdef __NR_pwrite64 /* Newer kernels renamed but it's the same. */
29 # ifdef __NR_pwrite
30 # error "__NR_pwrite and __NR_pwrite64 both defined???"
31 # endif
32 # define __NR_pwrite __NR_pwrite64
33 #endif
36 static ssize_t
37 do_pwrite64 (int fd, const void *buf, size_t count, off64_t offset)
39 ssize_t result;
41 result = INLINE_SYSCALL (pwrite, 5, fd, buf, count,
42 __LONG_LONG_PAIR ((off_t) (offset >> 32),
43 (off_t) (offset & 0xffffffff)));
45 return result;
49 ssize_t
50 __libc_pwrite64 (fd, buf, count, offset)
51 int fd;
52 const void *buf;
53 size_t count;
54 off64_t offset;
56 if (SINGLE_THREAD_P)
57 return do_pwrite64 (fd, buf, count, offset);
59 int oldtype = LIBC_CANCEL_ASYNC ();
61 ssize_t result = do_pwrite64 (fd, buf, count, offset);
63 LIBC_CANCEL_RESET (oldtype);
65 return result;
68 weak_alias (__libc_pwrite64, __pwrite64)
69 libc_hidden_weak (__pwrite64)
70 weak_alias (__libc_pwrite64, pwrite64)