1 /* getsockopt.c --- wrappers for Windows getsockopt function
2 
3    Copyright (C) 2008-2021 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 Lesser 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 Lesser General Public License for more details.
14 
15    You should have received a copy of the GNU Lesser 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
rpl_getsockopt(int fd,int level,int optname,void * optval,socklen_t * optlen)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 }
80