1  /* Linux lseek implementation, 64 bits off_t.
       2     Copyright (C) 2016-2023 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