configure tweaks, support $libc_add_on_config_subdirs
[glibc/pb-stable.git] / io / readlinkat.c
blob7e6a2227d8dc87f6ab9a20b71c11d3d35a3c5fee
1 /* Copyright (C) 2005, 2006 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
19 #include <errno.h>
20 #include <fcntl.h>
21 #include <unistd.h>
23 /* Read the contents of the symbolic link PATH relative to FD into no
24 more than 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 readlinkat (fd, path, buf, len)
28 int fd;
29 const char *path;
30 char *buf;
31 size_t len;
33 if (path == NULL)
35 __set_errno (EINVAL);
36 return -1;
39 if (fd != AT_FDCWD && fd < 0 && *path != '/')
41 __set_errno (EBADF);
42 return -1;
45 __set_errno (ENOSYS);
46 return -1;
48 stub_warning (readlinkat)
49 libc_hidden_def (readlinkat)
51 #include <stub-tag.h>