/* Copyright (C) 1991-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <stddef.h>

#include <unistd.h>

#include <hurd.h>

/* Make a link to FROM called TO.  */

int

__link (const char *from, const char *to)

{

  error_t err;

  file_t oldfile, linknode, todir;

  char *toname;

  oldfile = __file_name_lookup (from, 0, 0);

  if (oldfile == MACH_PORT_NULL)

    return -1;

  /* The file_getlinknode RPC returns the port that should be passed to

     the receiving filesystem (the one containing TODIR) in dir_link.  */

  err = __file_getlinknode (oldfile, &linknode);

  __mach_port_deallocate (__mach_task_self (), oldfile);

  if (err)

    return __hurd_fail (err);

  todir = __file_name_split (to, &toname);

  if (todir != MACH_PORT_NULL)

    {

      err = __dir_link (todir, linknode, toname, 1);

      __mach_port_deallocate (__mach_task_self (), todir);

    }

  __mach_port_deallocate (__mach_task_self (), linknode);

  if (todir == MACH_PORT_NULL)

    return -1;

  if (err)

    return __hurd_fail (err);

  return 0;

}

weak_alias (__link, link)