sysdeps/mach/hurd/link.c

   1 /* Copyright (C) 1991-2015 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <stddef.h>
  20 #include <unistd.h>
  21 #include <hurd.h>
  22
  23 /* Make a link to FROM called TO.  */
  24 int
  25 __link (const char *from, const char *to)
  26 {
  27   error_t err;
  28   file_t oldfile, linknode, todir;
  29   char *toname;
  30
  31   oldfile = __file_name_lookup (from, 0, 0);
  32   if (oldfile == MACH_PORT_NULL)
  33     return -1;
  34
  35   /* The file_getlinknode RPC returns the port that should be passed to
  36      the receiving filesystem (the one containing TODIR) in dir_link.  */
  37
  38   err = __file_getlinknode (oldfile, &linknode);
  39   __mach_port_deallocate (__mach_task_self (), oldfile);
  40   if (err)
  41     return __hurd_fail (err);
  42
  43   todir = __file_name_split (to, &toname);
  44   if (todir != MACH_PORT_NULL)
  45     {
  46       err = __dir_link (todir, linknode, toname, 1);
  47       __mach_port_deallocate (__mach_task_self (), todir);
  48     }
  49   __mach_port_deallocate (__mach_task_self (), linknode);
  50   if (todir == MACH_PORT_NULL)
  51     return -1;
  52
  53   if (err)
  54     return __hurd_fail (err);
  55   return 0;
  56 }
  57
  58 weak_alias (__link, link)