sysdeps/unix/sysv/linux/lseek64.c

   1 /* Linux lseek implementation, 64 bits off_t.
   2    Copyright (C) 2016-2019 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 <unistd.h>
  20 #include <stdint.h>
  21 #include <sys/types.h>
  22 #include <sysdep.h>
  23 #include <errno.h>
  24 #include <shlib-compat.h>
  25
  26 off64_t
  27 __lseek64 (int fd, off64_t offset, int whence)
  28 {
  29 #ifdef __NR__llseek
  30   loff_t res;
  31   int rc = INLINE_SYSCALL_CALL (_llseek, fd,
  32                                 (long) (((uint64_t) (offset)) >> 32),
  33                                 (long) offset, &res, whence);
  34   return rc ?: res;
  35 #else
  36   return INLINE_SYSCALL_CALL (lseek, fd, offset, whence);
  37 #endif
  38 }
  39
  40 #ifdef  __OFF_T_MATCHES_OFF64_T
  41 weak_alias (__lseek64, lseek)
  42 weak_alias (__lseek64, __lseek)
  43 strong_alias (__lseek64, __libc_lseek)
  44 libc_hidden_def (__lseek)
  45 #endif
  46
  47 strong_alias (__lseek64, __libc_lseek64)
  48 weak_alias (__lseek64, lseek64)
  49
  50 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_28)
  51 strong_alias (__lseek64, __compat_llseek)
  52 compat_symbol (libc, __compat_llseek, llseek, GLIBC_2_0);
  53 #endif