lib/getsockopt.c

   1 /* getsockopt.c --- wrappers for Windows getsockopt function
   2
   3    Copyright (C) 2008-2020 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 /* Written by Paolo Bonzini */
  19
  20 #include <config.h>
  21
  22 #define WIN32_LEAN_AND_MEAN
  23 /* Get winsock2.h. */
  24 #include <sys/socket.h>
  25
  26 /* Get struct timeval. */
  27 #include <sys/time.h>
  28
  29 /* Get memcpy. */
  30 #include <string.h>
  31
  32 /* Get set_winsock_errno, FD_TO_SOCKET etc. */
  33 #include "w32sock.h"
  34
  35 #undef getsockopt
  36
  37 int
  38 rpl_getsockopt (int fd, int level, int optname, void *optval, socklen_t *optlen)
  39 {
  40   SOCKET sock = FD_TO_SOCKET (fd);
  41
  42   if (sock == INVALID_SOCKET)
  43     {
  44       errno = EBADF;
  45       return -1;
  46     }
  47   else
  48     {
  49       int r;
  50
  51       if (level == SOL_SOCKET
  52           && (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
  53         {
  54           int milliseconds;
  55           int milliseconds_len = sizeof (int);
  56           struct timeval tv;
  57           size_t n;
  58
  59           r = getsockopt (sock, level, optname, (char *) &milliseconds,
  60                           &milliseconds_len);
  61           tv.tv_sec = milliseconds / 1000;
  62           tv.tv_usec = (milliseconds - 1000 * tv.tv_sec) * 1000;
  63           n = sizeof (struct timeval);
  64           if (n > *optlen)
  65             n = *optlen;
  66           memcpy (optval, &tv, n);
  67           *optlen = n;
  68         }
  69       else
  70         {
  71           r = getsockopt (sock, level, optname, optval, optlen);
  72         }
  73
  74       if (r < 0)
  75         set_winsock_errno ();
  76
  77       return r;
  78     }
  79 }