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_error = GetLastError();
143 bounce_status = _read(0, bounce_buf, sizeof(bounce_buf));
144 bounce_error = errno;
146 SetEvent(bounce_full);
151 * Initialize and start the stdin reading thread for WIN32
154 sysdep_stdin_init(void)
156 bounce_empty = CreateEvent(NULL, FALSE, TRUE, NULL);
157 bounce_full = CreateEvent(NULL, TRUE, FALSE, NULL);
158 ctrl_c_event = CreateEvent(NULL, FALSE, FALSE, NULL);
159 CreateThread(NULL, 0, stdin_read_thread, NULL, 0, NULL);
163 * This function uses to WaitForMultipleObjects to wait for both
164 * stdin and socket reading or writing.
165 * Stdin is treated special in WIN32. Waiting for stdin is done
166 * via a bounce_full event which is set in the stdin thread.
167 * Execute command file reading is done via handle. Execute
168 * command is read via CreateFile/ReadFile instead open/read
169 * because a file descriptor is not waitable.
170 * WaitForMultipleObjects will only respond with one object
171 * so an additonal select is also done to determine
172 * which individual events are active for the sock.
175 w32_select(int nfds, fd_set *rdfd, fd_set *wrfd, fd_set *errfd, struct timeval* time)
179 int result, s_result, num_handles = 0;
180 struct timeval tv_time = {0, 0};
183 if (rdfd->fd_count > 1) {
184 sock = rdfd->fd_array[1];
185 if (rdfd->fd_array[0])
186 handles[num_handles++] = (HANDLE)rdfd->fd_array[0];
188 handles[num_handles++] = ctrl_c_event;
189 handles[num_handles++] = bounce_full;
192 assert(rdfd->fd_count == 1);
193 sock = rdfd->fd_array[0];
195 assert(wrfd->fd_count == 0 ||
196 (wrfd->fd_count == 1 && wrfd->fd_array[0] == sock));
197 /* always wait on the socket */
198 handles[num_handles++] = WSACreateEvent();
200 if (wrfd->fd_count > 0)
201 WSAEventSelect(sock, handles[num_handles - 1],
202 FD_READ | FD_WRITE | FD_CLOSE);
204 WSAEventSelect(sock, handles[num_handles - 1],
207 result = WaitForMultipleObjects(num_handles, handles, 0, INFINITE);
209 errno = GetLastError();
210 WSACloseEvent(handles[num_handles - 1]);
213 WSACloseEvent(handles[num_handles - 1]);
215 if (num_handles == 3 && result == WAIT_OBJECT_0) {
221 FD_SET(sock, &rdfd2);
222 s_result = select(sock + 1, &rdfd2, wrfd, NULL, &tv_time);
225 errno = WSAGetLastError();
230 if (num_handles == 3 && result == WAIT_OBJECT_0 + 1) {
231 FD_SET((SOCKET)0, rdfd);
234 if (num_handles == 2 && result == WAIT_OBJECT_0) {
235 FD_SET((SOCKET)handles[0], rdfd);
242 * Read input from the user either stdin or from file.
243 * For stdin, read from bounce_buf which filled by the stdin thread
244 * otherwise use the regular ring_from_file.
247 w32_ring_from_file_or_bounce_buf(struct ring *r, int fd)
252 return ring_from_file(r, fd);
254 if (bounce_status < 0) {
255 errno = bounce_error;
258 for (i = 0; i < bounce_status; i++) {
259 if (ring_putc(r, bounce_buf[i]) == EOF) {
260 /* more work to do, hold on to bounce_buf */
261 memmove(bounce_buf, bounce_buf + i, bounce_status - i);
269 ResetEvent(bounce_full);
270 SetEvent(bounce_empty);
273 #define ring_from_file w32_ring_from_file_or_bounce_buf
274 #define close(fd) w32_close_handle((fd))
275 #define read(sock, buffer, buf_size) \
276 w32_recv((sock), (buffer), (buf_size), 0)
277 #define select(nfds, rd, wr, error, time) \
278 w32_select((nfds), (rd), (wr), (error), (time))
279 #define sigemptyset(mask) ((void)0)
281 #define sysdep_stdin_init() ((void)0)
284 #define EOF_COOKIE "ctld\n"
285 #define INTR_COOKIE "\naborted\n"
288 int send_eof; /* need to send EOF_COOKIE */
289 static volatile sig_atomic_t send_intr; /* need to send INTR_COOKIE */
292 * Receive and process server output from SOCK.
293 * Return number of characters received on success, -1 on error.
296 recv_output(int sock)
299 * Read a chunk of server output and feed its characters into a
300 * simple state machine.
301 * Initial state is SCANNING_ID.
302 * In state SCANNING_ID, buffer the character. If it's a space,
303 * decode the id that has been buffered, and enter state BUFFERING
304 * or COPYING depending on its value.
305 * In state BUFFERING, buffer the character. If it's newline,
306 * pass id and buffered text to servercmd(), then enter state
308 * In state COPYING, pass the character to outch(). If it's
309 * newline, enter state SCANNING_ID.
312 SCANNING_ID, BUFFERING, COPYING
313 } state = SCANNING_ID;
315 static struct lbuf lbuf;
321 n = read(sock, buf, sizeof(buf));
325 for (i = 0; i < n; i++) {
330 /* FIXME gripe unexpected! */
334 lbuf_putc(&lbuf, ch);
337 line = lbuf_line(&lbuf);
353 /* unknown or unexpected id, treat like C_DATA */
361 len = lbuf_putc(&lbuf, ch);
363 line = lbuf_line(&lbuf);
364 servercmd(id, line, len);
381 * Receive command input from FD into INBUF.
382 * Return 1 on receipt of input, zero on EOF, -1 on error.
385 recv_input(int fd, struct ring *inbuf)
387 static struct lbuf cmdbuf;
392 n = ring_from_file(inbuf, fd);
397 if (lbuf_len(&cmdbuf)) {
398 /* incomplete line */
399 ring_putc(inbuf, '\n');
403 * Can't put EOF cookie into INBUF here, it may not fit.
404 * Leave it to caller.
409 /* copy input to AUXFP etc. */
410 for (i = -n; i < 0; i++) {
411 ch = ring_peek(inbuf, i);
413 if (ch != '\r' && lbuf_putc(&cmdbuf, ch)) {
414 line = lbuf_line(&cmdbuf);
433 * The session must be in the playing phase.
434 * Return 0 when the session ended, -1 on error.
440 * Player input flows from INPUT_FD through recv_input() into ring
441 * buffer INBUF, which drains into SOCK. This must not block.
442 * Server output flows from SOCK into recv_output(). Reading SOCK
446 struct ring inbuf; /* input buffer, draining to SOCK */
447 int eof_fd0; /* read fd 0 hit EOF? */
452 sigemptyset(&sa.sa_mask);
453 sa.sa_handler = intr;
454 sigaction(SIGINT, &sa, NULL);
455 sa.sa_handler = SIG_IGN;
456 sigaction(SIGPIPE, &sa, NULL);
459 eof_fd0 = send_eof = send_intr = 0;
468 * Want to read player input only when we don't need to send
469 * cookies, and INPUT_FD is still open, and INBUF can accept
472 if (!send_intr && !send_eof && input_fd >= 0 && ring_space(&inbuf))
473 FD_SET(input_fd, &rdfd);
474 /* Want to send player input only when we have something */
475 if (send_intr || send_eof || ring_len(&inbuf))
477 /* Always want to read server output */
480 n = select(MAX(input_fd, sock) + 1, &rdfd, &wrfd, NULL, NULL);
482 if (errno != EINTR) {
489 && ring_putm(&inbuf, EOF_COOKIE, sizeof(EOF_COOKIE) - 1) >= 0)
492 && ring_putm(&inbuf, INTR_COOKIE, sizeof(INTR_COOKIE) - 1) >= 0)
498 /* read player input */
499 if (input_fd >= 0 && FD_ISSET(input_fd, &rdfd)) {
500 n = recv_input(input_fd, &inbuf);
502 perror("read stdin"); /* FIXME stdin misleading, could be execing */
509 /* execute done, switch back to fd 0 */
511 input_fd = eof_fd0 ? -1 : 0;
513 /* stop reading input, drain socket ring buffers */
516 sa.sa_handler = SIG_DFL;
517 sigaction(SIGINT, &sa, NULL);
522 /* send it to the server */
523 if (FD_ISSET(sock, &wrfd)) {
524 n = ring_to_file(&inbuf, sock);
526 perror("write socket");
531 /* read server output and print it */
532 if (FD_ISSET(sock, &rdfd)) {
533 n = recv_output(sock);
535 perror("read socket");