/* Copyright (C) 1994-2018 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 <sys/socket.h>

#include <sys/un.h>

#include <hurd.h>

#include <hurd/fd.h>

#include <hurd/ifsock.h>

#include <hurd/socket.h>

#include "hurd/hurdsocket.h"

/* Send N bytes of BUF on socket FD to peer at address ADDR (which is

   ADDR_LEN bytes long).  Returns the number sent, or -1 for errors.  */

ssize_t

__sendto (int fd,

	  const void *buf,

	  size_t n,

	  int flags,

	  const struct sockaddr_un *addr,

	  socklen_t addr_len)

{

  addr_port_t aport = MACH_PORT_NULL;

  error_t err;

  size_t wrote;

  /* Get an address port for the desired destination address.  */

  error_t create_address_port (io_t port,

			       const struct sockaddr_un *addr,

			       socklen_t addr_len,

			       addr_port_t *aport)

    {

      error_t err_port;

      if (addr->sun_family == AF_LOCAL)

	{

	  char *name = _hurd_sun_path_dupa (addr, addr_len);

	  /* For the local domain, we must look up the name as a file and talk

	     to it with the ifsock protocol.  */

	  file_t file = __file_name_lookup (name, 0, 0);

	  if (file == MACH_PORT_NULL)

	    return errno;

	  err_port = __ifsock_getsockaddr (file, aport);

	  __mach_port_deallocate (__mach_task_self (), file);

	  if (err_port == MIG_BAD_ID || err_port == EOPNOTSUPP)

	    /* The file did not grok the ifsock protocol.  */

	    err_port = ENOTSOCK;

	}

      else

	{

	  err_port = __socket_create_address (port,

					      addr->sun_family,

					      (char *) addr,

					      addr_len,

					      aport);

	}

      return err_port;

    }

  err = HURD_DPORT_USE (fd,

			({

			  if (addr != NULL)

			    err = create_address_port (port, addr, addr_len,

						       &aport);

			  else

			    err = 0;

			  if (! err)

			    {

			      /* Send the data.  */

			      err = __socket_send (port, aport,

						   flags, buf, n,

						   NULL,

						   MACH_MSG_TYPE_COPY_SEND, 0,

						   NULL, 0, &wrote);

			    }

			  err;

			}));

  if (aport != MACH_PORT_NULL)

    __mach_port_deallocate (__mach_task_self (), aport);

  return err ? __hurd_sockfail (fd, flags, err) : wrote;

}

weak_alias (__sendto, sendto)