io/linkat.c

   1 /* Copyright (C) 2005, 2006 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   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.
   8
   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.
  13
  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.  */
  18
  19 #include <errno.h>
  20 #include <fcntl.h>
  21 #include <stddef.h>
  22 #include <unistd.h>
  23
  24
  25 /* Make a link to FROM relative to FROMFD called TO relative to TOFD.  */
  26 int
  27 linkat (fromfd, from, tofd, to, flags)
  28      int fromfd;
  29      const char *from;
  30      int tofd;
  31      const char *to;
  32      int flags;
  33 {
  34   if (from == NULL || to == NULL)
  35     {
  36       __set_errno (EINVAL);
  37       return -1;
  38     }
  39
  40   if ((tofd != AT_FDCWD && tofd < 0 && *to != '/')
  41       || (fromfd != AT_FDCWD && fromfd < 0 && *from != '/'))
  42     {
  43       __set_errno (EBADF);
  44       return -1;
  45     }
  46
  47   __set_errno (ENOSYS);
  48   return -1;
  49 }
  50 stub_warning (linkat)
  51
  52 #include <stub-tag.h>