/* 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; see the file COPYING.LIB.  If

   not, see <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <fcntl.h>

#include <fcntl-internal.h>

#include <string.h>

#include <sys/socket.h>

#include <hurd.h>

#include <hurd/fd.h>

#include <hurd/socket.h>

/* Await a connection on socket FD.

   When a connection arrives, open a new socket to communicate with it,

   set *ADDRARG (which is *ADDR_LEN bytes long) to the address of the connecting

   peer and *ADDR_LEN to the address's actual length, and return the

   new socket's descriptor, or -1 for errors.  The operation can be influenced

   by the FLAGS parameter.  */

int

__libc_accept4 (int fd, __SOCKADDR_ARG addrarg, socklen_t *addr_len, int flags)

{

  error_t err;

  socket_t new;

  addr_port_t aport;

  struct sockaddr *addr = addrarg.__sockaddr__;

  char *buf = (char *) addr;

  mach_msg_type_number_t buflen;

  int type;

  flags = sock_to_o_flags (flags);

  if (flags & ~(O_CLOEXEC | O_NONBLOCK))

    return __hurd_fail (EINVAL);

  if (err = HURD_DPORT_USE (fd, __socket_accept (port, &new, &aport)))

    return __hurd_dfail (fd, err);

  if (addr != NULL)

    {

      buflen = *addr_len;

      err = __socket_whatis_address (aport, &type, &buf, &buflen);

      if (err == EOPNOTSUPP)

	/* If the protocol server can't tell us the address, just return a

	   zero-length one.  */

	{

	  buf = (char *)addr;

	  buflen = 0;

	  err = 0;

	}

    }

  __mach_port_deallocate (__mach_task_self (), aport);

  if (! err)

    {

      if (flags & O_NONBLOCK)

	err = __io_set_some_openmodes (new, O_NONBLOCK);

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

    }

  if (err)

    {

      __mach_port_deallocate (__mach_task_self (), new);

      return __hurd_dfail (fd, err);

    }

  if (addr != NULL)

    {

      if (*addr_len > buflen)

	*addr_len = buflen;

      if (buf != (char *) addr)

	{

	  memcpy (addr, buf, *addr_len);

	  __vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);

	}

      if (buflen > 0)

	addr->sa_family = type;

    }

  return _hurd_intern_fd (new, O_IGNORE_CTTY | flags, 1);

}

weak_alias (__libc_accept4, accept4)