sysdeps/unix/sysv/linux/generic/wordsize-32/lseek.c

   1 /* Copyright (C) 2011-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
   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 <errno.h>
  20 #include <unistd.h>
  21 #include <sys/types.h>
  22
  23 #include <sysdep.h>
  24 #include <sys/syscall.h>
  25
  26 #include "overflow.h"
  27
  28 off_t
  29 __lseek (int fd, off_t offset, int whence)
  30 {
  31   loff_t res;
  32   int rc = INLINE_SYSCALL (_llseek, 5, fd, (off_t) (offset >> 31),
  33                            (off_t) offset, &res, whence);
  34   return rc ?: lseek_overflow (res);
  35 }
  36 libc_hidden_def (__lseek)
  37 weak_alias (__lseek, lseek)
  38 strong_alias (__lseek, __libc_lseek)