1 /* recvfrom.c --- wrappers for Windows recvfrom function 2 3 Copyright (C) 2008-2021 Free Software Foundation, Inc. 4 5 This file is free software: you can redistribute it and/or modify 6 it under the terms of the GNU Lesser General Public License as 7 published by the Free Software Foundation; either version 2.1 of the 8 License, or (at your option) any later version. 9 10 This file 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 set_winsock_errno, FD_TO_SOCKET etc. */ 27 #include "w32sock.h" 28 29 #undef recvfrom 30 31 ssize_t 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 }