sysdeps/unix/sysv/linux/generic/readlink.c

   1 /* Copyright (C) 2011-2015 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 <fcntl.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   return INLINE_SYSCALL (readlinkat, 4, AT_FDCWD, path, buf, len);
  30 }
  31 weak_alias (__readlink, readlink)