sysdeps/unix/sysv/linux/lseek64.c

   1 /* Linux lseek implementation, 64 bits off_t.
   2    Copyright (C) 2016-2024 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 # define __NR__llseek __NR_llseek
  31 #endif
  32
  33 #ifdef __NR__llseek
  34   loff_t res;
  35   int rc = INLINE_SYSCALL_CALL (_llseek, fd,
  36                                 (long) (((uint64_t) (offset)) >> 32),
  37                                 (long) offset, &res, whence);
  38   return rc ?: res;
  39 #else
  40   return INLINE_SYSCALL_CALL (lseek, fd, offset, whence);
  41 #endif
  42 }
  43
  44 #ifdef  __OFF_T_MATCHES_OFF64_T
  45 weak_alias (__lseek64, lseek)
  46 weak_alias (__lseek64, __lseek)
  47 strong_alias (__lseek64, __libc_lseek)
  48 libc_hidden_def (__lseek)
  49 #endif
  50
  51 strong_alias (__lseek64, __libc_lseek64)
  52 weak_alias (__lseek64, lseek64)
  53
  54 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_28)
  55 compat_symbol (libc, __lseek64, llseek, GLIBC_2_0);
  56 #endif
  57
  58 #if !IS_IN(rtld) && OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_1, GLIBC_2_2)
  59 compat_symbol (libc, __lseek64, lseek64, GLIBC_2_2);
  60 #endif