mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-15 04:20:28 +08:00
04277e02d7
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/* Linux lseek implementation, 32 bits off_t.
|
|
Copyright (C) 2016-2019 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <unistd.h>
|
|
#include <stdint.h>
|
|
#include <sys/types.h>
|
|
#include <sysdep.h>
|
|
#include <errno.h>
|
|
|
|
#ifndef __OFF_T_MATCHES_OFF64_T
|
|
|
|
/* Test for overflows of structures where we ask the kernel to fill them
|
|
in with standard 64-bit syscalls but return them through APIs that
|
|
only expose the low 32 bits of some fields. */
|
|
|
|
static inline off_t lseek_overflow (loff_t res)
|
|
{
|
|
off_t retval = (off_t) res;
|
|
if (retval == res)
|
|
return retval;
|
|
|
|
__set_errno (EOVERFLOW);
|
|
return (off_t) -1;
|
|
}
|
|
|
|
off_t
|
|
__lseek (int fd, off_t offset, int whence)
|
|
{
|
|
# ifdef __NR__llseek
|
|
loff_t res;
|
|
int rc = INLINE_SYSCALL_CALL (_llseek, fd,
|
|
(long) (((uint64_t) (offset)) >> 32),
|
|
(long) offset, &res, whence);
|
|
return rc ?: lseek_overflow (res);
|
|
# else
|
|
return INLINE_SYSCALL_CALL (lseek, fd, offset, whence);
|
|
# endif
|
|
}
|
|
libc_hidden_def (__lseek)
|
|
weak_alias (__lseek, lseek)
|
|
strong_alias (__lseek, __libc_lseek)
|
|
#endif /* __OFF_T_MATCHES_OFF64_T */
|