/* Copyright (C) 1992-2018 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 <fcntl.h>

#include <fcntl-internal.h>

#include <sys/socket.h>

#include <unistd.h>

#include <hurd.h>

#include <hurd/fd.h>

#include <hurd/socket.h>

/* Create two new sockets, of type TYPE in domain DOMAIN and using

   protocol PROTOCOL, which are connected to each other, and put file

   descriptors for them in FDS[0] and FDS[1].  If PROTOCOL is zero,

   one will be chosen automatically.  Returns 0 on success, -1 for errors.  */

int

__socketpair (int domain, int type, int protocol, int fds[2])

{

  error_t err;

  socket_t server, sock1, sock2;

  int d1, d2;

  int flags = sock_to_o_flags (type & ~SOCK_TYPE_MASK);

  type &= SOCK_TYPE_MASK;

  if (flags & ~(O_CLOEXEC | O_NONBLOCK))

    return __hurd_fail (EINVAL);

  if (fds == NULL)

    return __hurd_fail (EINVAL);

  /* Find the domain's socket server.  */

  server = _hurd_socket_server (domain, 0);

  if (server == MACH_PORT_NULL)

    return -1;

  /* Create two sockets and connect them together.  */

  err = __socket_create (server, type, protocol, &sock1);

  if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED

      || err == MIG_BAD_ID || err == EOPNOTSUPP)

    {

      /* On the first use of the socket server during the operation,

	 allow for the old server port dying.  */

      server = _hurd_socket_server (domain, 1);

      if (server == MACH_PORT_NULL)

	return -1;

      err = __socket_create (server, type, protocol, &sock1);

    }

  /* TODO: do we need special ERR massaging here, like it is done in

     __socket?  */

  if (! err)

    {

      if (flags & O_NONBLOCK)

	err = __io_set_some_openmodes (sock1, O_NONBLOCK);

      /* TODO: do we need special ERR massaging after the previous call?  */

    }

  if (err)

    return __hurd_fail (err);

  if (err = __socket_create (server, type, protocol, &sock2))

    {

      __mach_port_deallocate (__mach_task_self (), sock1);

      return __hurd_fail (err);

    }

  if (flags & O_NONBLOCK)

    err = __io_set_some_openmodes (sock2, O_NONBLOCK);

  /* TODO: do we need special ERR massaging after the previous call?  */

  if (! err)

    err = __socket_connect2 (sock1, sock2);

  if (err)

    {

      __mach_port_deallocate (__mach_task_self (), sock1);

      __mach_port_deallocate (__mach_task_self (), sock2);

      return __hurd_fail (err);

    }

  /* Put the sockets into file descriptors.  */

  d1 = _hurd_intern_fd (sock1, O_IGNORE_CTTY | flags, 1);

  if (d1 < 0)

    {

      __mach_port_deallocate (__mach_task_self (), sock2);

      return -1;

    }

  d2 = _hurd_intern_fd (sock2, O_IGNORE_CTTY | flags, 1);

  if (d2 < 0)

    {

      err = errno;

      (void) __close (d1);

      return __hurd_fail (err);

    }

  fds[0] = d1;

  fds[1] = d2;

  return 0;

}

weak_alias (__socketpair, socketpair)