1/* Linux lseek implementation, 64 bits off_t.
2 Copyright (C) 2016-2017 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 <http://www.gnu.org/licenses/>. */
18
19#include <unistd.h>
20#include <stdint.h>
21#include <sys/types.h>
22#include <sysdep.h>
23#include <errno.h>
24
25off64_t
26__lseek64 (int fd, off64_t offset, int whence)
27{
28#ifdef __NR__llseek
29 loff_t res;
30 int rc = INLINE_SYSCALL_CALL (_llseek, fd,
31 (long) (((uint64_t) (offset)) >> 32),
32 (long) offset, &res, whence);
33 return rc ?: res;
34#else
35 return INLINE_SYSCALL_CALL (lseek, fd, offset, whence);
36#endif
37}
38
39#ifdef __OFF_T_MATCHES_OFF64_T
40weak_alias (__lseek64, lseek)
41weak_alias (__lseek64, __lseek)
42strong_alias (__lseek64, __libc_lseek)
43libc_hidden_def (__lseek)
44#endif
45
46strong_alias (__lseek64, __libc_lseek64)
47weak_alias (__lseek64, lseek64)
48
49/* llseek doesn't have a prototype. Since the second parameter is a
50 64bit type, this results in wrong behaviour if no prototype is
51 provided. */
52weak_alias (__lseek64, llseek)
53link_warning (llseek, "\
54the `llseek' function may be dangerous; use `lseek64' instead.")
55