1  /* Read value of a symbolic link.  Linux version.
       2     Copyright (C) 2011-2023 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 <fcntl.h>
      21  #include <sysdep.h>
      22  
      23  /* Read the contents of the symbolic link PATH into no more than
      24     LEN bytes of BUF.  The contents are not null-terminated.
      25     Returns the number of characters read, or -1 for errors.  */
      26  ssize_t
      27  __readlink (const char *path, char *buf, size_t len)
      28  {
      29  #ifdef __NR_readlink
      30    return INLINE_SYSCALL_CALL (readlink, path, buf, len);
      31  #else
      32    return INLINE_SYSCALL_CALL (readlinkat, AT_FDCWD, path, buf, len);
      33  #endif
      34  }
      35  weak_alias (__readlink, readlink)