2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2009, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * See files README, COPYING and CREDITS in the root of the source
23 * tree for related information and legal notices. It is expected
24 * that future projects/authors will amend these files as needed.
28 * play.c: Playing the game
30 * Known contributors to this file:
31 * Markus Armbruster, 2007
32 * Ron Koenderink, 2007-2009
43 #include <sys/select.h>
55 static CRITICAL_SECTION signal_critical_section;
56 static LPCRITICAL_SECTION signal_critical_section_ptr = NULL;
58 static unsigned char bounce_buf[RING_SIZE];
60 * Set bounce_empty to indicate bounce_buf is available for the stdin thread
63 static HANDLE bounce_empty;
65 * Set bounce_full to indicate bounce_buf is contains data from the
66 * stdin thread and is available for recv_input
68 static HANDLE bounce_full;
69 /* Ctrl-C (SIGINT) was detected, generate EINTR for the w32_select() */
70 static HANDLE ctrl_c_event;
71 static int bounce_status, bounce_error;
74 static void (*ctrl_handler)(int sig) = { SIG_DFL };
77 * Ctrl-C handler for emulating the SIGINT in WIN32
80 w32_signal_handler(DWORD ctrl_type)
82 if (ctrl_type == CTRL_C_EVENT) {
83 EnterCriticalSection(signal_critical_section_ptr);
84 if (ctrl_handler != SIG_DFL) {
86 LeaveCriticalSection(signal_critical_section_ptr);
87 SetEvent(ctrl_c_event);
90 LeaveCriticalSection(signal_critical_section_ptr);
96 * WIN32 equivalent for sigaction supports the following:
97 * set handler for SIGINT using WIN32 Ctrl-C handler
98 * reset handler SIGINT to SIG_DFL
102 sigaction(int signal, struct sigaction *action, struct sigaction *oaction)
107 if (signal == SIGPIPE)
108 assert(action->sa_handler == SIG_IGN);
110 assert(signal == SIGINT && action->sa_handler != SIG_IGN);
111 if (ctrl_handler == action->sa_handler)
113 if (signal_critical_section_ptr == NULL) {
114 signal_critical_section_ptr = &signal_critical_section;
115 InitializeCriticalSection(signal_critical_section_ptr);
117 EnterCriticalSection(signal_critical_section_ptr);
118 if (!SetConsoleCtrlHandler(w32_signal_handler,
119 action->sa_handler != SIG_DFL)) {
120 errno = GetLastError();
121 LeaveCriticalSection(signal_critical_section_ptr);
124 ctrl_handler = action->sa_handler;
125 LeaveCriticalSection(signal_critical_section_ptr);
131 * Read the stdin in WIN32 environment
132 * WIN32 does not support select type function on console input
133 * so the client uses a separate thread to read input
136 stdin_read_thread(LPVOID lpParam)
139 if (WaitForSingleObject(bounce_empty, INFINITE) != WAIT_OBJECT_0)
141 bounce_status = _read(0, bounce_buf, sizeof(bounce_buf));
142 bounce_error = errno;
143 if (bounce_status == 0) {
145 SetEvent(bounce_empty);
150 SetEvent(bounce_full);
152 SetEvent(bounce_full);
157 * Initialize and start the stdin reading thread for WIN32
160 sysdep_stdin_init(void)
162 bounce_empty = CreateEvent(NULL, FALSE, TRUE, NULL);
163 bounce_full = CreateEvent(NULL, TRUE, FALSE, NULL);
164 ctrl_c_event = CreateEvent(NULL, FALSE, FALSE, NULL);
165 CreateThread(NULL, 0, stdin_read_thread, NULL, 0, NULL);
169 * This function uses to WaitForMultipleObjects to wait for both
170 * stdin and socket reading or writing.
171 * Stdin is treated special in WIN32. Waiting for stdin is done
172 * via a bounce_full event which is set in the stdin thread.
173 * Execute command file reading is done via handle. Execute
174 * command is read via CreateFile/ReadFile instead open/read
175 * because a file descriptor is not waitable.
176 * WaitForMultipleObjects will only respond with one object
177 * so an additonal select is also done to determine
178 * which individual events are active for the sock.
181 w32_select(int nfds, fd_set *rdfd, fd_set *wrfd, fd_set *errfd, struct timeval* time)
185 int result, s_result, num_handles = 0;
186 struct timeval tv_time = {0, 0};
189 if (rdfd->fd_count > 1) {
190 sock = rdfd->fd_array[1];
191 if (rdfd->fd_array[0])
192 handles[num_handles++] = (HANDLE)rdfd->fd_array[0];
194 handles[num_handles++] = ctrl_c_event;
195 handles[num_handles++] = bounce_full;
198 assert(rdfd->fd_count == 1);
199 sock = rdfd->fd_array[0];
201 assert(wrfd->fd_count == 0 ||
202 (wrfd->fd_count == 1 && wrfd->fd_array[0] == sock));
203 /* always wait on the socket */
204 handles[num_handles++] = WSACreateEvent();
206 if (wrfd->fd_count > 0)
207 WSAEventSelect(sock, handles[num_handles - 1],
208 FD_READ | FD_WRITE | FD_CLOSE);
210 WSAEventSelect(sock, handles[num_handles - 1],
213 result = WaitForMultipleObjects(num_handles, handles, 0, INFINITE);
215 errno = GetLastError();
216 WSACloseEvent(handles[num_handles - 1]);
219 WSACloseEvent(handles[num_handles - 1]);
221 if (num_handles == 3 && result == WAIT_OBJECT_0) {
227 FD_SET(sock, &rdfd2);
228 s_result = select(sock + 1, &rdfd2, wrfd, NULL, &tv_time);
231 errno = WSAGetLastError();
236 if (num_handles == 3 && result == WAIT_OBJECT_0 + 1) {
237 FD_SET((SOCKET)0, rdfd);
240 if (num_handles == 2 && result == WAIT_OBJECT_0) {
241 FD_SET((SOCKET)handles[0], rdfd);
248 * Read input from the user either stdin or from file.
249 * For stdin, read from bounce_buf which filled by the stdin thread
250 * otherwise use the regular ring_from_file.
253 w32_ring_from_file_or_bounce_buf(struct ring *r, int fd)
258 return ring_from_file(r, fd);
260 if (bounce_status < 0) {
261 errno = bounce_error;
264 for (i = 0; i < bounce_status; i++) {
265 if (ring_putc(r, bounce_buf[i]) == EOF) {
266 /* more work to do, hold on to bounce_buf */
267 memmove(bounce_buf, bounce_buf + i, bounce_status - i);
275 ResetEvent(bounce_full);
276 SetEvent(bounce_empty);
279 #define ring_from_file w32_ring_from_file_or_bounce_buf
280 #define close(fd) w32_close_handle((fd))
281 #define read(sock, buffer, buf_size) \
282 w32_recv((sock), (buffer), (buf_size), 0)
283 #define select(nfds, rd, wr, error, time) \
284 w32_select((nfds), (rd), (wr), (error), (time))
285 #define sigemptyset(mask) ((void)0)
287 #define sysdep_stdin_init() ((void)0)
290 #define EOF_COOKIE "ctld\n"
291 #define INTR_COOKIE "\naborted\n"
294 int send_eof; /* need to send EOF_COOKIE */
295 static volatile sig_atomic_t send_intr; /* need to send INTR_COOKIE */
298 * Receive and process server output from SOCK.
299 * Return number of characters received on success, -1 on error.
302 recv_output(int sock)
305 * Read a chunk of server output and feed its characters into a
306 * simple state machine.
307 * Initial state is SCANNING_ID.
308 * In state SCANNING_ID, buffer the character. If it's a space,
309 * decode the id that has been buffered, and enter state BUFFERING
310 * or COPYING depending on its value.
311 * In state BUFFERING, buffer the character. If it's newline,
312 * pass id and buffered text to servercmd(), then enter state
314 * In state COPYING, pass the character to outch(). If it's
315 * newline, enter state SCANNING_ID.
318 SCANNING_ID, BUFFERING, COPYING
319 } state = SCANNING_ID;
321 static struct lbuf lbuf;
327 n = read(sock, buf, sizeof(buf));
331 for (i = 0; i < n; i++) {
336 /* FIXME gripe unexpected! */
340 lbuf_putc(&lbuf, ch);
343 line = lbuf_line(&lbuf);
359 /* unknown or unexpected id, treat like C_DATA */
367 len = lbuf_putc(&lbuf, ch);
369 line = lbuf_line(&lbuf);
370 servercmd(id, line, len);
387 * Receive command input from FD into INBUF.
388 * Return 1 on receipt of input, zero on EOF, -1 on error.
391 recv_input(int fd, struct ring *inbuf)
393 static struct lbuf cmdbuf;
398 n = ring_from_file(inbuf, fd);
403 if (lbuf_len(&cmdbuf)) {
404 /* incomplete line */
405 ring_putc(inbuf, '\n');
409 * Can't put EOF cookie into INBUF here, it may not fit.
410 * Leave it to caller.
415 /* copy input to AUXFP etc. */
416 for (i = -n; i < 0; i++) {
417 ch = ring_peek(inbuf, i);
419 if (ch != '\r' && lbuf_putc(&cmdbuf, ch)) {
420 line = lbuf_line(&cmdbuf);
439 * The session must be in the playing phase.
440 * Return 0 when the session ended, -1 on error.
446 * Player input flows from INPUT_FD through recv_input() into ring
447 * buffer INBUF, which drains into SOCK. This must not block.
448 * Server output flows from SOCK into recv_output(). Reading SOCK
452 struct ring inbuf; /* input buffer, draining to SOCK */
453 int eof_fd0; /* read fd 0 hit EOF? */
458 sigemptyset(&sa.sa_mask);
459 sa.sa_handler = intr;
460 sigaction(SIGINT, &sa, NULL);
461 sa.sa_handler = SIG_IGN;
462 sigaction(SIGPIPE, &sa, NULL);
465 eof_fd0 = send_eof = send_intr = 0;
474 * Want to read player input only when we don't need to send
475 * cookies, and INPUT_FD is still open, and INBUF can accept
478 if (!send_intr && !send_eof && input_fd >= 0 && ring_space(&inbuf))
479 FD_SET(input_fd, &rdfd);
480 /* Want to send player input only when we have something */
481 if (send_intr || send_eof || ring_len(&inbuf))
483 /* Always want to read server output */
486 n = select(MAX(input_fd, sock) + 1, &rdfd, &wrfd, NULL, NULL);
488 if (errno != EINTR) {
495 && ring_putm(&inbuf, EOF_COOKIE, sizeof(EOF_COOKIE) - 1) >= 0)
498 && ring_putm(&inbuf, INTR_COOKIE, sizeof(INTR_COOKIE) - 1) >= 0)
504 /* read player input */
505 if (input_fd >= 0 && FD_ISSET(input_fd, &rdfd)) {
506 n = recv_input(input_fd, &inbuf);
508 perror("read stdin"); /* FIXME stdin misleading, could be execing */
515 /* execute done, switch back to fd 0 */
517 input_fd = eof_fd0 ? -1 : 0;
519 /* stop reading input, drain socket ring buffers */
522 sa.sa_handler = SIG_DFL;
523 sigaction(SIGINT, &sa, NULL);
528 /* send it to the server */
529 if (FD_ISSET(sock, &wrfd)) {
530 n = ring_to_file(&inbuf, sock);
532 perror("write socket");
537 /* read server output and print it */
538 if (FD_ISSET(sock, &rdfd)) {
539 n = recv_output(sock);
541 perror("read socket");