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173 lines
4.1 KiB
173 lines
4.1 KiB
/*
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* Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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/*
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* listen.c - listen for incoming connections
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*/
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#ifdef __STRICT_ANSI__
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#define _BSD_SOURCE
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#endif
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#include <unistd.h>
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#include <sys/types.h>
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#ifdef __MINGW32__
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#define close closesocket
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#include <winsock2.h>
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#undef max
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#else
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#include <sys/wait.h>
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#include <sys/utsname.h>
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#endif
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#include <sys/time.h>
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#include <rfb/rfbclient.h>
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/*
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* listenForIncomingConnections() - listen for incoming connections from
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* servers, and fork a new process to deal with each connection.
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*/
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void
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listenForIncomingConnections(rfbClient* client)
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{
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#ifdef __MINGW32__
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/* FIXME */
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rfbClientErr("listenForIncomingConnections on MinGW32 NOT IMPLEMENTED\n");
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return;
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#else
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int listenSocket;
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fd_set fds;
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client->listenSpecified = TRUE;
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listenSocket = ListenAtTcpPortAndAddress(client->listenPort, client->listenAddress);
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if ((listenSocket < 0))
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return;
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rfbClientLog("%s -listen: Listening on port %d\n",
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client->programName,client->listenPort);
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rfbClientLog("%s -listen: Command line errors are not reported until "
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"a connection comes in.\n", client->programName);
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while (TRUE) {
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/* reap any zombies */
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int status, pid;
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while ((pid= wait3(&status, WNOHANG, (struct rusage *)0))>0);
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/* TODO: callback for discard any events (like X11 events) */
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FD_ZERO(&fds);
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FD_SET(listenSocket, &fds);
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select(listenSocket+1, &fds, NULL, NULL, NULL);
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if (FD_ISSET(listenSocket, &fds)) {
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client->sock = AcceptTcpConnection(listenSocket);
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if (client->sock < 0)
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return;
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if (!SetNonBlocking(client->sock))
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return;
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/* Now fork off a new process to deal with it... */
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switch (fork()) {
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case -1:
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rfbClientErr("fork\n");
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return;
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case 0:
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/* child - return to caller */
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close(listenSocket);
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return;
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default:
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/* parent - go round and listen again */
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close(client->sock);
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break;
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}
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}
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}
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#endif
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}
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/*
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* listenForIncomingConnectionsNoFork() - listen for incoming connections
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* from servers, but DON'T fork, instead just wait timeout microseconds.
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* If timeout is negative, block indefinitly.
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* Returns 1 on success (there was an incoming connection on the listen socket
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* and we accepted it successfully), -1 on error, 0 on timeout.
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*/
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int
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listenForIncomingConnectionsNoFork(rfbClient* client, int timeout)
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{
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fd_set fds;
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struct timeval to;
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int r;
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to.tv_sec= timeout / 1000000;
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to.tv_usec= timeout % 1000000;
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client->listenSpecified = TRUE;
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if (client->listenSock < 0)
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{
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client->listenSock = ListenAtTcpPortAndAddress(client->listenPort, client->listenAddress);
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if (client->listenSock < 0)
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return -1;
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rfbClientLog("%s -listennofork: Listening on port %d\n",
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client->programName,client->listenPort);
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rfbClientLog("%s -listennofork: Command line errors are not reported until "
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"a connection comes in.\n", client->programName);
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}
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FD_ZERO(&fds);
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FD_SET(client->listenSock, &fds);
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if (timeout < 0)
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r = select(client->listenSock+1, &fds, NULL, NULL, NULL);
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else
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r = select(client->listenSock+1, &fds, NULL, NULL, &to);
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if (r > 0)
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{
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client->sock = AcceptTcpConnection(client->listenSock);
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if (client->sock < 0)
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return -1;
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if (!SetNonBlocking(client->sock))
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return -1;
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close(client->listenSock);
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return r;
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}
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/* r is now either 0 (timeout) or -1 (error) */
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return r;
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}
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