1 /* recvfrom.c --- wrappers for Windows recvfrom function
2
3 Copyright (C) 2008-2017 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 <http://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 set_winsock_errno, FD_TO_SOCKET etc. */
27 #include "w32sock.h"
28
29 #undef recvfrom
30
31 ssize_t
rpl_recvfrom(int fd,void * buf,size_t len,int flags,struct sockaddr * from,socklen_t * fromlen)32 rpl_recvfrom (int fd, void *buf, size_t len, int flags, struct sockaddr *from,
33 socklen_t *fromlen)
34 {
35 SOCKET sock = FD_TO_SOCKET (fd);
36
37 if (sock == INVALID_SOCKET)
38 {
39 errno = EBADF;
40 return -1;
41 }
42 else
43 {
44 int frombufsize = (from != NULL ? *fromlen : 0);
45 int r = recvfrom (sock, buf, len, flags, from, fromlen);
46
47 if (r < 0)
48 set_winsock_errno ();
49
50 /* Winsock recvfrom() only returns a valid 'from' when the socket is
51 connectionless. POSIX gives a valid 'from' for all types of
52 sockets. */
53 else if (from != NULL && *fromlen == frombufsize)
54 rpl_getpeername (fd, from, fromlen);
55
56 return r;
57 }
58 }
59