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 (from, to)
  26      const char *from;
  27      const char *to;
  28 {
  29   error_t err;
  30   file_t oldfile, linknode, todir;
  31   char *toname;
  32
  33   oldfile = __file_name_lookup (from, 0, 0);
  34   if (oldfile == MACH_PORT_NULL)
  35     return -1;
  36
  37   /* The file_getlinknode RPC returns the port that should be passed to
  38      the receiving filesystem (the one containing TODIR) in dir_link.  */
  39
  40   err = __file_getlinknode (oldfile, &linknode);
  41   __mach_port_deallocate (__mach_task_self (), oldfile);
  42   if (err)
  43     return __hurd_fail (err);
  44
  45   todir = __file_name_split (to, &toname);
  46   if (todir != MACH_PORT_NULL)
  47     {
  48       err = __dir_link (todir, linknode, toname, 1);
  49       __mach_port_deallocate (__mach_task_self (), todir);
  50     }
  51   __mach_port_deallocate (__mach_task_self (), linknode);
  52   if (todir == MACH_PORT_NULL)
  53     return -1;
  54
  55   if (err)
  56     return __hurd_fail (err);
  57   return 0;
  58 }
  59
  60 weak_alias (__link, link)