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