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glibc  2.9
readlinkat.c
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00001 /* Copyright (C) 2005, 2006 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <fcntl.h>
00021 #include <unistd.h>
00022 
00023 /* Read the contents of the symbolic link PATH relative to FD into no
00024    more than LEN bytes of BUF.  The contents are not null-terminated.
00025    Returns the number of characters read, or -1 for errors.  */
00026 ssize_t
00027 readlinkat (fd, path, buf, len)
00028      int fd;
00029      const char *path;
00030      char *buf;
00031      size_t len;
00032 {
00033   if (path == NULL)
00034     {
00035       __set_errno (EINVAL);
00036       return -1;
00037     }
00038 
00039   if (fd != AT_FDCWD && fd < 0 && *path != '/')
00040     {
00041       __set_errno (EBADF);
00042       return -1;
00043     }
00044 
00045   __set_errno (ENOSYS);
00046   return -1;
00047 }
00048 stub_warning (readlinkat)
00049 libc_hidden_def (readlinkat)
00050 
00051 #include <stub-tag.h>