/* 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 <string.h>

#include <sys/socket.h>

#include <hurd.h>

#include <hurd/fd.h>

#include <hurd/socket.h>

/* Read N bytes into BUF through socket FD.

   If ADDR is not NULL, fill in *ADDR_LEN bytes of it with tha address of

   the sender, and store the actual size of the address in *ADDR_LEN.

   Returns the number of bytes read or -1 for errors.  */

ssize_t

__recvfrom (int fd, void *buf, size_t n, int flags, __SOCKADDR_ARG addrarg,

	    socklen_t *addr_len)

{

  error_t err;

  mach_port_t addrport;

  char *bufp = buf;

  mach_msg_type_number_t nread = n;

  mach_port_t *ports;

  mach_msg_type_number_t nports = 0;

  char *cdata = NULL;

  mach_msg_type_number_t clen = 0;

  struct sockaddr *addr = addrarg.__sockaddr__;

  if (err = HURD_DPORT_USE (fd, __socket_recv (port, &addrport,

					       flags, &bufp, &nread,

					       &ports, &nports,

					       &cdata, &clen,

					       &flags,

					       n)))

    return __hurd_sockfail (fd, flags, err);

  /* Get address data for the returned address port if requested.  */

  if (addr != NULL && addrport != MACH_PORT_NULL)

    {

      char *buf = (char *) addr;

      mach_msg_type_number_t buflen = *addr_len;

      int type;

      err = __socket_whatis_address (addrport, &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;

	}

      if (err)

	{

	  __mach_port_deallocate (__mach_task_self (), addrport);

	  return __hurd_sockfail (fd, flags, err);

	}

      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;

    }

  else if (addr_len != NULL)

    *addr_len = 0;

  __mach_port_deallocate (__mach_task_self (), addrport);

  /* Toss control data; we don't care.  */

  __vm_deallocate (__mach_task_self (), (vm_address_t) cdata, clen);

  if (bufp != buf)

    {

      memcpy (buf, bufp, nread);

      __vm_deallocate (__mach_task_self (), (vm_address_t) bufp, nread);

    }

  return nread;

}

weak_alias (__recvfrom, recvfrom)