sysdeps/mach/hurd/link.c

   1 /* Copyright (C) 1991, 1992, 1993, 1994, 1995 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <errno.h>
  21 #include <stddef.h>
  22 #include <unistd.h>
  23 #include <hurd.h>
  24
  25 /* Make a link to FROM called TO.  */
  26 int
  27 DEFUN(__link, (from, to), CONST char *from AND 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 (linknode, todir, toname);
  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)