guile/lib/getsockopt.c

/* getsockopt.c --- wrappers for Windows getsockopt function

   Copyright (C) 2008-2011 Free Software Foundation, Inc.

   This program 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 3 of the License, or
   (at your option) any later version.

   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* Written by Paolo Bonzini */

#include <config.h>

#define WIN32_LEAN_AND_MEAN
/* Get winsock2.h. */
#include <sys/socket.h>

/* Get struct timeval. */
#include <sys/time.h>

/* Get memcpy. */
#include <string.h>

/* Get set_winsock_errno, FD_TO_SOCKET etc. */
#include "w32sock.h"

#undef getsockopt

int
rpl_getsockopt (int fd, int level, int optname, void *optval, socklen_t *optlen)
{
  int r;
  SOCKET sock = FD_TO_SOCKET (fd);

  if (level == SOL_SOCKET && (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
    {
      int milliseconds;
      int milliseconds_len = sizeof (int);
      struct timeval tv;
      size_t n;
      r = getsockopt (sock, level, optname, &milliseconds, &milliseconds_len);
      tv.tv_sec = milliseconds / 1000;
      tv.tv_usec = (milliseconds - 1000 * tv.tv_sec) * 1000;
      n = sizeof (struct timeval);
      if (n > *optlen)
        n = *optlen;
      memcpy (optval, &tv, n);
      *optlen = n;
    }
  else
    {
      r = getsockopt (sock, level, optname, optval, optlen);
    }

  if (r < 0)
    set_winsock_errno ();

  return r;
}