1 /***********************************************************
2 * Rocks'n'Diamonds -- McDuffin Strikes Back! *
3 *----------------------------------------------------------*
4 * (c) 1995-2006 Artsoft Entertainment *
5 * Holger Schemel *
6 * Detmolder Strasse 189 *
7 * 33604 Bielefeld *
8 * Germany *
9 * e-mail: info@artsoft.org *
10 *----------------------------------------------------------*
11 * network.c *
12 ***********************************************************/
13
14 #include "libgame/platform.h"
15
16 #if defined(NETWORK_AVALIABLE)
17
18 #include <signal.h>
19 #include <sys/time.h>
20
21 #if defined(TARGET_SDL)
22 #include "main.h"
23 #else
24 #include <sys/wait.h>
25 #include <sys/socket.h>
26 #include <netinet/in.h>
27 #include <netinet/tcp.h>
28 #include <arpa/inet.h>
29 #include <netdb.h>
30 #endif
31
32 #include "libgame/libgame.h"
33
34 #include "network.h"
35 #include "netserv.h"
36 #include "game.h"
37 #include "tape.h"
38 #include "files.h"
39 #include "tools.h"
40 #include "screens.h"
41
42 struct NetworkClientPlayerInfo
43 {
44 byte nr;
45 char name[MAX_PLAYER_NAME_LEN + 1];
46 struct NetworkClientPlayerInfo *next;
47 };
48
49 static struct NetworkClientPlayerInfo first_player =
50 {
51 0,
52 EMPTY_PLAYER_NAME,
53 NULL
54 };
55
56 /* server stuff */
57
58 #if defined(TARGET_SDL)
59 static TCPsocket sfd; /* server socket */
60 static SDLNet_SocketSet rfds; /* socket set */
61 #else
62 static int sfd; /* server socket */
63 #endif
64
65 static byte realbuffer[512];
66 static byte readbuffer[MAX_BUFFER_SIZE], writbuffer[MAX_BUFFER_SIZE];
67 static byte *buffer = realbuffer + 4;
68 static int nread = 0, nwrite = 0;
69 static boolean stop_network_game = FALSE;
70
SendBufferToServer(int size)71 static void SendBufferToServer(int size)
72 {
73 if (!options.network)
74 return;
75
76 realbuffer[0] = realbuffer[1] = realbuffer[2] = 0;
77 realbuffer[3] = (byte)size;
78 buffer[0] = 0;
79
80 if (nwrite + 4 + size >= MAX_BUFFER_SIZE)
81 Error(ERR_EXIT, "internal error: network send buffer overflow");
82
83 memcpy(writbuffer + nwrite, realbuffer, 4 + size);
84 nwrite += 4 + size;
85
86 /* directly send the buffer to the network server */
87 #if defined(TARGET_SDL)
88 SDLNet_TCP_Send(sfd, writbuffer, nwrite);
89 #else
90 if (write(sfd, writbuffer, nwrite) == -1)
91 Error(ERR_WARN, "write() failed; %s", strerror(errno));
92 #endif
93 nwrite = 0;
94 }
95
getNetworkPlayer(int player_nr)96 struct NetworkClientPlayerInfo *getNetworkPlayer(int player_nr)
97 {
98 struct NetworkClientPlayerInfo *player = NULL;
99
100 for (player = &first_player; player; player = player->next)
101 if (player->nr == player_nr)
102 break;
103
104 if (player == NULL) /* should not happen */
105 Error(ERR_EXIT, "protocol error: reference to non-existing player %d",
106 player_nr);
107
108 return player;
109 }
110
getNetworkPlayerName(int player_nr)111 char *getNetworkPlayerName(int player_nr)
112 {
113 struct NetworkClientPlayerInfo *player;
114
115 if (player_nr == 0)
116 return("the network game server");
117 else if (player_nr == first_player.nr)
118 return("you");
119 else
120 for (player = &first_player; player; player = player->next)
121 if (player->nr == player_nr && player->name && strlen(player->name))
122 return(player->name);
123
124 return(EMPTY_PLAYER_NAME);
125 }
126
StartNetworkServer(int port)127 static void StartNetworkServer(int port)
128 {
129 #if defined(TARGET_SDL)
130 static int p;
131
132 p = port;
133 server_thread = SDL_CreateThread(NetworkServerThread, &p);
134 network_server = TRUE;
135
136 #else
137
138 switch (fork())
139 {
140 case 0:
141 NetworkServer(port, options.serveronly);
142
143 /* never reached */
144 exit(0);
145
146 case -1:
147 Error(ERR_WARN,
148 "cannot create network server process - no network playing");
149 options.network = FALSE;
150 return;
151
152 default:
153 /* we are parent process -- resume normal operation */
154 return;
155 }
156 #endif
157 }
158
159 #if defined(TARGET_SDL)
ConnectToServer(char * hostname,int port)160 boolean ConnectToServer(char *hostname, int port)
161 {
162 IPaddress ip;
163 int i;
164
165 if (port == 0)
166 port = DEFAULT_SERVER_PORT;
167
168 rfds = SDLNet_AllocSocketSet(1);
169
170 if (hostname)
171 {
172 SDLNet_ResolveHost(&ip, hostname, port);
173 if (ip.host == INADDR_NONE)
174 Error(ERR_EXIT, "cannot locate host '%s'", hostname);
175 }
176 else
177 {
178 SDLNet_Write32(0x7f000001, &ip.host); /* 127.0.0.1 */
179 SDLNet_Write16(port, &ip.port);
180 }
181
182 sfd = SDLNet_TCP_Open(&ip);
183
184 if (sfd)
185 {
186 SDLNet_TCP_AddSocket(rfds, sfd);
187 return TRUE;
188 }
189 else
190 {
191 printf("SDLNet_TCP_Open(): %s\n", SDLNet_GetError());
192 }
193
194 if (hostname) /* connect to specified server failed */
195 return FALSE;
196
197 printf("No rocksndiamonds server on localhost -- starting up one ...\n");
198 StartNetworkServer(port);
199
200 /* wait for server to start up and try connecting several times */
201 for (i = 0; i < 6; i++)
202 {
203 Delay(500); /* wait 500 ms == 0.5 seconds */
204
205 if ((sfd = SDLNet_TCP_Open(&ip))) /* connected */
206 {
207 SDLNet_TCP_AddSocket(rfds, sfd);
208 return TRUE;
209 }
210 }
211
212 /* when reaching this point, connect to newly started server has failed */
213 return FALSE;
214 }
215
216 #else
217
ConnectToServer(char * hostname,int port)218 boolean ConnectToServer(char *hostname, int port)
219 {
220 struct sockaddr_in s;
221 struct protoent *tcpproto;
222 int on = 1, i;
223
224 if (hostname)
225 {
226 if ((s.sin_addr.s_addr = inet_addr(hostname)) == -1)
227 {
228 struct hostent *host;
229
230 if ((host = gethostbyname(hostname)) == NULL)
231 Error(ERR_EXIT, "cannot locate host '%s'", hostname);
232
233 s.sin_addr = *(struct in_addr *)(host->h_addr_list[0]);
234 }
235 }
236 else
237 s.sin_addr.s_addr = inet_addr("127.0.0.1"); /* localhost */
238
239 if (port == 0)
240 port = DEFAULT_SERVER_PORT;
241
242 s.sin_port = htons(port);
243 s.sin_family = AF_INET;
244
245 sfd = socket(PF_INET, SOCK_STREAM, 0);
246 if (sfd < 0)
247 Error(ERR_EXIT, "out of file descriptors");
248
249 if ((tcpproto = getprotobyname("tcp")) != NULL)
250 setsockopt(sfd, tcpproto->p_proto, TCP_NODELAY, (char *)&on, sizeof(int));
251
252 if (connect(sfd, (struct sockaddr *)&s, sizeof(s)) == 0) /* connected */
253 return TRUE;
254
255 if (hostname) /* connect to specified server failed */
256 return FALSE;
257
258 printf("No rocksndiamonds server on localhost -- starting up one ...\n");
259 StartNetworkServer(port);
260
261 /* wait for server to start up and try connecting several times */
262 for (i = 0; i < 6; i++)
263 {
264 Delay(500); /* wait 500 ms == 0.5 seconds */
265 close(sfd);
266
267 sfd = socket(PF_INET, SOCK_STREAM, 0);
268 if (sfd < 0)
269 Error(ERR_EXIT, "out of file descriptors");
270
271 setsockopt(sfd, tcpproto->p_proto, TCP_NODELAY, (char *)&on, sizeof(int));
272
273 if (connect(sfd, (struct sockaddr *)&s, sizeof(s)) >= 0) /* connected */
274 return TRUE;
275 }
276
277 /* when reaching this point, connect to newly started server has failed */
278 return FALSE;
279 }
280 #endif /* defined(TARGET_SDL) */
281
SendToServer_PlayerName(char * player_name)282 void SendToServer_PlayerName(char *player_name)
283 {
284 int len_player_name = strlen(player_name);
285
286 buffer[1] = OP_PLAYER_NAME;
287 memcpy(&buffer[2], player_name, len_player_name);
288 SendBufferToServer(2 + len_player_name);
289 Error(ERR_NETWORK_CLIENT, "you set your player name to \"%s\"", player_name);
290 }
291
SendToServer_ProtocolVersion()292 void SendToServer_ProtocolVersion()
293 {
294 buffer[1] = OP_PROTOCOL_VERSION;
295 buffer[2] = PROTOCOL_VERSION_1;
296 buffer[3] = PROTOCOL_VERSION_2;
297 buffer[4] = PROTOCOL_VERSION_3;
298
299 SendBufferToServer(5);
300 }
301
SendToServer_NrWanted(int nr_wanted)302 void SendToServer_NrWanted(int nr_wanted)
303 {
304 buffer[1] = OP_NUMBER_WANTED;
305 buffer[2] = nr_wanted;
306
307 SendBufferToServer(3);
308 }
309
SendToServer_StartPlaying()310 void SendToServer_StartPlaying()
311 {
312 unsigned int new_random_seed = InitRND(level.random_seed);
313
314 int dummy = 0; /* !!! HAS NO MEANING ANYMORE !!! */
315 /* the name of the level must be enough */
316
317 buffer[1] = OP_START_PLAYING;
318 buffer[2] = (byte)(level_nr >> 8);
319 buffer[3] = (byte)(level_nr & 0xff);
320 buffer[4] = (byte)(dummy >> 8);
321 buffer[5] = (byte)(dummy & 0xff);
322
323 buffer[6] = (unsigned char)((new_random_seed >> 24) & 0xff);
324 buffer[7] = (unsigned char)((new_random_seed >> 16) & 0xff);
325 buffer[8] = (unsigned char)((new_random_seed >> 8) & 0xff);
326 buffer[9] = (unsigned char)((new_random_seed >> 0) & 0xff);
327
328 strcpy((char *)&buffer[10], leveldir_current->identifier);
329
330 SendBufferToServer(10 + strlen(leveldir_current->identifier) + 1);
331 }
332
SendToServer_PausePlaying()333 void SendToServer_PausePlaying()
334 {
335 buffer[1] = OP_PAUSE_PLAYING;
336
337 SendBufferToServer(2);
338 }
339
SendToServer_ContinuePlaying()340 void SendToServer_ContinuePlaying()
341 {
342 buffer[1] = OP_CONTINUE_PLAYING;
343
344 SendBufferToServer(2);
345 }
346
SendToServer_StopPlaying(int cause_for_stopping)347 void SendToServer_StopPlaying(int cause_for_stopping)
348 {
349 buffer[1] = OP_STOP_PLAYING;
350 buffer[2] = cause_for_stopping;
351
352 SendBufferToServer(3);
353 }
354
SendToServer_MovePlayer(byte player_action)355 void SendToServer_MovePlayer(byte player_action)
356 {
357 buffer[1] = OP_MOVE_PLAYER;
358 buffer[2] = player_action;
359
360 SendBufferToServer(3);
361 }
362
Handle_OP_BAD_PROTOCOL_VERSION()363 static void Handle_OP_BAD_PROTOCOL_VERSION()
364 {
365 Error(ERR_WARN, "protocol version mismatch");
366 Error(ERR_EXIT, "server expects %d.%d.x instead of %d.%d.%d",
367 buffer[2], buffer[3],
368 PROTOCOL_VERSION_1, PROTOCOL_VERSION_2, PROTOCOL_VERSION_3);
369 }
370
Handle_OP_YOUR_NUMBER()371 static void Handle_OP_YOUR_NUMBER()
372 {
373 int new_client_nr = buffer[2];
374 int new_index_nr = new_client_nr - 1;
375 struct PlayerInfo *old_local_player = local_player;
376 struct PlayerInfo *new_local_player = &stored_player[new_index_nr];
377
378 printf("OP_YOUR_NUMBER: %d\n", buffer[0]);
379 first_player.nr = new_client_nr;
380
381 if (old_local_player != new_local_player)
382 {
383 /* copy existing player settings and change to new player */
384
385 *new_local_player = *old_local_player;
386 old_local_player->connected = FALSE;
387 local_player = new_local_player;
388 }
389
390 if (first_player.nr > MAX_PLAYERS)
391 Error(ERR_EXIT, "sorry, more than %d players not allowed", MAX_PLAYERS);
392
393 Error(ERR_NETWORK_CLIENT, "you get client # %d", new_client_nr);
394 }
395
Handle_OP_NUMBER_WANTED()396 static void Handle_OP_NUMBER_WANTED()
397 {
398 int client_nr_wanted = buffer[2];
399 int old_client_nr = buffer[0];
400 int new_client_nr = buffer[3];
401 int old_index_nr = old_client_nr - 1;
402 int new_index_nr = new_client_nr - 1;
403 int index_nr_wanted = client_nr_wanted - 1;
404 struct PlayerInfo *old_player = &stored_player[old_index_nr];
405 struct PlayerInfo *new_player = &stored_player[new_index_nr];
406
407 printf("OP_NUMBER_WANTED: %d\n", buffer[0]);
408
409 if (new_client_nr == client_nr_wanted) /* switching succeeded */
410 {
411 struct NetworkClientPlayerInfo *player;
412
413 if (old_client_nr != client_nr_wanted) /* client's nr has changed */
414 Error(ERR_NETWORK_CLIENT, "client %d switches to # %d",
415 old_client_nr, new_client_nr);
416 else if (old_client_nr == first_player.nr) /* local player keeps his nr */
417 Error(ERR_NETWORK_CLIENT, "keeping client # %d", new_client_nr);
418
419 if (old_client_nr != new_client_nr)
420 {
421 /* copy existing player settings and change to new player */
422
423 *new_player = *old_player;
424 old_player->connected = FALSE;
425 }
426
427 player = getNetworkPlayer(old_client_nr);
428 player->nr = new_client_nr;
429
430 if (old_player == local_player) /* local player switched */
431 local_player = new_player;
432 }
433 else if (old_client_nr == first_player.nr) /* failed -- local player? */
434 {
435 char request[100];
436
437 sprintf(request, "Sorry ! Player %d already exists ! You are player %d !",
438 index_nr_wanted + 1, new_index_nr + 1);
439
440 Request(request, REQ_CONFIRM);
441
442 Error(ERR_NETWORK_CLIENT, "cannot switch -- you keep client # %d",
443 new_client_nr);
444 }
445 }
446
Handle_OP_PLAYER_NAME(unsigned int len)447 static void Handle_OP_PLAYER_NAME(unsigned int len)
448 {
449 struct NetworkClientPlayerInfo *player;
450 int player_nr = (int)buffer[0];
451
452 printf("OP_PLAYER_NAME: %d\n", player_nr);
453 player = getNetworkPlayer(player_nr);
454 buffer[len] = 0;
455 Error(ERR_NETWORK_CLIENT, "client %d calls itself \"%s\"",
456 buffer[0], &buffer[2]);
457 strncpy(player->name, (char *)&buffer[2], MAX_PLAYER_NAME_LEN);
458 }
459
Handle_OP_PLAYER_CONNECTED()460 static void Handle_OP_PLAYER_CONNECTED()
461 {
462 struct NetworkClientPlayerInfo *player, *last_player = NULL;
463 int new_client_nr = (int)buffer[0];
464 int new_index_nr = new_client_nr - 1;
465
466 printf("OP_PLAYER_CONNECTED: %d\n", new_client_nr);
467 Error(ERR_NETWORK_CLIENT, "new client %d connected", new_client_nr);
468
469 for (player = &first_player; player; player = player->next)
470 {
471 if (player->nr == new_client_nr)
472 Error(ERR_EXIT, "multiplayer server sent duplicate player id");
473
474 last_player = player;
475 }
476
477 last_player->next = player =
478 checked_malloc(sizeof(struct NetworkClientPlayerInfo));
479 player->nr = new_client_nr;
480 player->name[0] = '\0';
481 player->next = NULL;
482
483 stored_player[new_index_nr].connected = TRUE;
484 }
485
Handle_OP_PLAYER_DISCONNECTED()486 static void Handle_OP_PLAYER_DISCONNECTED()
487 {
488 struct NetworkClientPlayerInfo *player, *player_disconnected;
489 int player_nr = (int)buffer[0];
490
491 printf("OP_PLAYER_DISCONNECTED: %d\n", player_nr);
492 player_disconnected = getNetworkPlayer(player_nr);
493 Error(ERR_NETWORK_CLIENT, "client %d (%s) disconnected",
494 player_nr, getNetworkPlayerName(buffer[0]));
495
496 for (player = &first_player; player; player = player->next)
497 if (player->next == player_disconnected)
498 player->next = player_disconnected->next;
499 free(player_disconnected);
500 }
501
Handle_OP_START_PLAYING()502 static void Handle_OP_START_PLAYING()
503 {
504 LevelDirTree *new_leveldir;
505 int new_level_nr;
506 unsigned int new_random_seed;
507 char *new_leveldir_identifier;
508
509 new_level_nr = (buffer[2] << 8) + buffer[3];
510 new_random_seed =
511 (buffer[6] << 24) | (buffer[7] << 16) | (buffer[8] << 8) | (buffer[9]);
512 new_leveldir_identifier = (char *)&buffer[10];
513
514 new_leveldir = getTreeInfoFromIdentifier(leveldir_first,
515 new_leveldir_identifier);
516 if (new_leveldir == NULL)
517 {
518 Error(ERR_WARN, "no such level identifier: '%s'", new_leveldir_identifier);
519
520 new_leveldir = leveldir_first;
521 Error(ERR_WARN, "using default level set: '%s'", new_leveldir->identifier);
522 }
523
524 printf("OP_START_PLAYING: %d\n", buffer[0]);
525 Error(ERR_NETWORK_CLIENT,
526 "client %d starts game [level %d from level identifier '%s']\n",
527 buffer[0], new_level_nr, new_leveldir->identifier);
528
529 leveldir_current = new_leveldir;
530 level_nr = new_level_nr;
531
532 TapeErase();
533 LoadTape(level_nr);
534 LoadLevel(level_nr);
535
536 StartGameActions(FALSE, setup.autorecord, new_random_seed);
537 }
538
Handle_OP_PAUSE_PLAYING()539 static void Handle_OP_PAUSE_PLAYING()
540 {
541 printf("OP_PAUSE_PLAYING: %d\n", buffer[0]);
542 Error(ERR_NETWORK_CLIENT, "client %d pauses game", buffer[0]);
543
544 tape.pausing = TRUE;
545 DrawVideoDisplay(VIDEO_STATE_PAUSE_ON,0);
546 }
547
Handle_OP_CONTINUE_PLAYING()548 static void Handle_OP_CONTINUE_PLAYING()
549 {
550 printf("OP_CONTINUE_PLAYING: %d\n", buffer[0]);
551 Error(ERR_NETWORK_CLIENT, "client %d continues game", buffer[0]);
552
553 tape.pausing = FALSE;
554 DrawVideoDisplay(VIDEO_STATE_PAUSE_OFF,0);
555 }
556
Handle_OP_STOP_PLAYING()557 static void Handle_OP_STOP_PLAYING()
558 {
559 printf("OP_STOP_PLAYING: %d [%d]\n", buffer[0], buffer[2]);
560 Error(ERR_NETWORK_CLIENT, "client %d stops game [%d]", buffer[0], buffer[2]);
561
562 if (game_status == GAME_MODE_PLAYING)
563 {
564 if (buffer[2] == NETWORK_STOP_BY_PLAYER)
565 Request("Network game stopped by player!", REQ_CONFIRM);
566 else if (buffer[2] == NETWORK_STOP_BY_ERROR)
567 Request("Network game stopped due to internal error!", REQ_CONFIRM);
568 else
569 Request("Network game stopped !", REQ_CONFIRM);
570 }
571
572 game_status = GAME_MODE_MAIN;
573 DrawMainMenu();
574 }
575
Handle_OP_MOVE_PLAYER(unsigned int len)576 static void Handle_OP_MOVE_PLAYER(unsigned int len)
577 {
578 int server_frame_counter;
579 int i;
580
581 if (!network_playing)
582 return;
583
584 server_frame_counter =
585 (buffer[2] << 24) | (buffer[3] << 16) | (buffer[4] << 8) | (buffer[5]);
586
587 #if 0
588 Error(ERR_NETWORK_CLIENT, "receiving server frame counter value %d [%d]",
589 server_frame_counter, FrameCounter);
590 #endif
591
592 if (server_frame_counter != FrameCounter)
593 {
594 Error(ERR_INFO, "client and servers frame counters out of sync");
595 Error(ERR_INFO, "frame counter of client is %d", FrameCounter);
596 Error(ERR_INFO, "frame counter of server is %d", server_frame_counter);
597 Error(ERR_INFO, "this should not happen -- please debug");
598
599 stop_network_game = TRUE;
600
601 return;
602 }
603
604 /* copy valid player actions */
605 for (i = 0; i < MAX_PLAYERS; i++)
606 stored_player[i].effective_action =
607 (i < len - 6 && stored_player[i].active ? buffer[6 + i] : 0);
608
609 network_player_action_received = TRUE;
610 }
611
HandleNetworkingMessages()612 static void HandleNetworkingMessages()
613 {
614 unsigned int message_length;
615
616 stop_network_game = FALSE;
617
618 while (nread >= 4 && nread >= 4 + readbuffer[3])
619 {
620 message_length = readbuffer[3];
621 if (readbuffer[0] || readbuffer[1] || readbuffer[2])
622 Error(ERR_EXIT, "wrong network server line length");
623
624 memcpy(buffer, &readbuffer[4], message_length);
625 nread -= 4 + message_length;
626 memmove(readbuffer, readbuffer + 4 + message_length, nread);
627
628 switch (buffer[1])
629 {
630 case OP_BAD_PROTOCOL_VERSION:
631 Handle_OP_BAD_PROTOCOL_VERSION();
632 break;
633
634 case OP_YOUR_NUMBER:
635 Handle_OP_YOUR_NUMBER();
636 break;
637
638 case OP_NUMBER_WANTED:
639 Handle_OP_NUMBER_WANTED();
640 break;
641
642 case OP_PLAYER_NAME:
643 Handle_OP_PLAYER_NAME(message_length);
644 break;
645
646 case OP_PLAYER_CONNECTED:
647 Handle_OP_PLAYER_CONNECTED();
648 break;
649
650 case OP_PLAYER_DISCONNECTED:
651 Handle_OP_PLAYER_DISCONNECTED();
652 break;
653
654 case OP_START_PLAYING:
655 Handle_OP_START_PLAYING();
656 break;
657
658 case OP_PAUSE_PLAYING:
659 Handle_OP_PAUSE_PLAYING();
660 break;
661
662 case OP_CONTINUE_PLAYING:
663 Handle_OP_CONTINUE_PLAYING();
664 break;
665
666 case OP_STOP_PLAYING:
667 Handle_OP_STOP_PLAYING();
668 break;
669
670 case OP_MOVE_PLAYER:
671 Handle_OP_MOVE_PLAYER(message_length);
672 break;
673
674 case OP_BROADCAST_MESSAGE:
675 printf("OP_BROADCAST_MESSAGE: %d\n", buffer[0]);
676 Error(ERR_NETWORK_CLIENT, "client %d sends message", buffer[0]);
677 break;
678 }
679 }
680
681 fflush(stdout);
682
683 /* in case of internal error, stop network game */
684 if (stop_network_game)
685 SendToServer_StopPlaying(NETWORK_STOP_BY_ERROR);
686 }
687
688 /* TODO */
689
HandleNetworking()690 void HandleNetworking()
691 {
692 #if !defined(TARGET_SDL)
693 static struct timeval tv = { 0, 0 };
694 fd_set rfds;
695 #endif
696 int r = 0;
697
698 do
699 {
700 #if defined(TARGET_SDL)
701 if ((r = SDLNet_CheckSockets(rfds, 1)) < 0)
702 Error(ERR_EXIT, "HandleNetworking(): SDLNet_CheckSockets() failed");
703
704 #else
705
706 FD_ZERO(&rfds);
707 FD_SET(sfd, &rfds);
708
709 r = select(sfd + 1, &rfds, NULL, NULL, &tv);
710
711 if (r < 0 && errno != EINTR)
712 Error(ERR_EXIT, "HandleNetworking(): select() failed");
713
714 if (r < 0)
715 FD_ZERO(&rfds);
716 #endif
717
718 #if defined(TARGET_SDL)
719 if (r > 0)
720 #else
721 if (FD_ISSET(sfd, &rfds))
722 #endif
723 {
724 #if defined(TARGET_SDL)
725 r = SDLNet_TCP_Recv(sfd, readbuffer + nread, 1);
726 #else
727 r = read(sfd, readbuffer + nread, MAX_BUFFER_SIZE - nread);
728 #endif
729
730 if (r < 0)
731 Error(ERR_EXIT, "error reading from network server");
732
733 if (r == 0)
734 Error(ERR_EXIT, "connection to network server lost");
735
736 nread += r;
737
738 HandleNetworkingMessages();
739 }
740 }
741 while (r > 0);
742 }
743
744 #endif /* PLATFORM_UNIX */
745