sync.c revision 1.26
1 /* $NetBSD: sync.c,v 1.26 2009/03/14 18:32:47 dholland Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)sync.c 8.2 (Berkeley) 4/28/95"; 36 #else 37 __RCSID("$NetBSD: sync.c,v 1.26 2009/03/14 18:32:47 dholland Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/stat.h> 42 43 #include <fcntl.h> 44 #include <errno.h> 45 #include <signal.h> 46 #include <stdarg.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <time.h> 51 #include <unistd.h> 52 #include "extern.h" 53 #include "pathnames.h" 54 55 #define BUFSIZE 4096 56 57 static int sync_update(int, struct ship *, const char *, long, long, long, long); 58 59 static const char SF[] = _PATH_SYNC; 60 static const char LF[] = _PATH_LOCK; 61 static char sync_buf[BUFSIZE]; 62 static char *sync_bp = sync_buf; 63 static char sync_lock[sizeof SF]; 64 static char sync_file[sizeof LF]; 65 static long sync_seek; 66 static FILE *sync_fp; 67 68 void 69 fmtship(char *buf, size_t len, const char *fmt, struct ship *ship) 70 { 71 while (*fmt) { 72 if (len-- == 0) { 73 *buf = '\0'; 74 return; 75 } 76 if (*fmt == '$' && fmt[1] == '$') { 77 size_t l = snprintf(buf, len, "%s (%c%c)", 78 ship->shipname, colours(ship), sterncolour(ship)); 79 buf += l; 80 len -= l - 1; 81 fmt += 2; 82 } 83 else 84 *buf++ = *fmt++; 85 } 86 87 if (len > 0) 88 *buf = '\0'; 89 } 90 91 92 /*VARARGS3*/ 93 void 94 makesignal(struct ship *from, const char *fmt, struct ship *ship, ...) 95 { 96 char message[BUFSIZ]; 97 char format[BUFSIZ]; 98 va_list ap; 99 100 va_start(ap, ship); 101 fmtship(format, sizeof(format), fmt, ship); 102 vsnprintf(message, sizeof(message), format, ap); 103 va_end(ap); 104 Writestr(W_SIGNAL, from, message); 105 } 106 107 /*VARARGS2*/ 108 void 109 makemsg(struct ship *from, const char *fmt, ...) 110 { 111 char message[BUFSIZ]; 112 va_list ap; 113 114 va_start(ap, fmt); 115 vsnprintf(message, sizeof(message), fmt, ap); 116 va_end(ap); 117 Writestr(W_SIGNAL, from, message); 118 } 119 120 int 121 sync_exists(int gamenum) 122 { 123 char buf[sizeof sync_file]; 124 struct stat s; 125 time_t t; 126 127 snprintf(buf, sizeof(buf), SF, gamenum); 128 time(&t); 129 setegid(egid); 130 if (stat(buf, &s) < 0) { 131 setegid(gid); 132 return 0; 133 } 134 if (s.st_mtime < t - 60*60*2) { /* 2 hours */ 135 unlink(buf); 136 snprintf(buf, sizeof(buf), LF, gamenum); 137 unlink(buf); 138 setegid(gid); 139 return 0; 140 } else { 141 setegid(gid); 142 return 1; 143 } 144 } 145 146 int 147 sync_open(void) 148 { 149 struct stat tmp; 150 if (sync_fp != NULL) 151 fclose(sync_fp); 152 snprintf(sync_lock, sizeof(sync_lock), LF, game); 153 snprintf(sync_file, sizeof(sync_file), SF, game); 154 setegid(egid); 155 if (stat(sync_file, &tmp) < 0) { 156 mode_t omask = umask(002); 157 sync_fp = fopen(sync_file, "w+"); 158 umask(omask); 159 } else 160 sync_fp = fopen(sync_file, "r+"); 161 setegid(gid); 162 if (sync_fp == NULL) 163 return -1; 164 sync_seek = 0; 165 return 0; 166 } 167 168 void 169 sync_close(int doremove) 170 { 171 if (sync_fp != 0) 172 fclose(sync_fp); 173 if (doremove) { 174 setegid(egid); 175 unlink(sync_file); 176 setegid(gid); 177 } 178 } 179 180 void 181 Write(int type, struct ship *ship, long a, long b, long c, long d) 182 { 183 size_t max = sizeof(sync_buf) - (sync_bp - sync_buf); 184 185 snprintf(sync_bp, max, "%d %d 0 %ld %ld %ld %ld\n", 186 type, ship->file->index, a, b, c, d); 187 while (*sync_bp++) 188 ; 189 sync_bp--; 190 if (sync_bp >= &sync_buf[sizeof sync_buf]) 191 abort(); 192 sync_update(type, ship, NULL, a, b, c, d); 193 } 194 195 void 196 Writestr(int type, struct ship *ship, const char *a) 197 { 198 size_t max = sizeof(sync_buf) - (sync_bp - sync_buf); 199 200 snprintf(sync_bp, max, "%d %d 1 %s\n", type, ship->file->index, a); 201 while (*sync_bp++) 202 ; 203 sync_bp--; 204 if (sync_bp >= &sync_buf[sizeof sync_buf]) 205 abort(); 206 sync_update(type, ship, a, 0, 0, 0, 0); 207 } 208 209 int 210 Sync(void) 211 { 212 sig_t sighup, sigint; 213 int n; 214 int type, shipnum, isstr; 215 char *astr; 216 long a, b, c, d; 217 char buf[80]; 218 char erred = 0; 219 220 sighup = signal(SIGHUP, SIG_IGN); 221 sigint = signal(SIGINT, SIG_IGN); 222 for (n = TIMEOUT; --n >= 0;) { 223 #ifdef LOCK_EX 224 if (flock(fileno(sync_fp), LOCK_EX|LOCK_NB) >= 0) 225 break; 226 if (errno != EWOULDBLOCK) 227 return -1; 228 #else 229 setegid(egid); 230 if (link(sync_file, sync_lock) >= 0) { 231 setegid(gid); 232 break; 233 } 234 setegid(gid); 235 if (errno != EEXIST) 236 return -1; 237 #endif 238 sleep(1); 239 } 240 if (n <= 0) 241 return -1; 242 fseek(sync_fp, sync_seek, SEEK_SET); 243 for (;;) { 244 switch (fscanf(sync_fp, "%d%d%d", &type, &shipnum, &isstr)) { 245 case 3: 246 break; 247 case EOF: 248 goto out; 249 default: 250 goto bad; 251 } 252 if (shipnum < 0 || shipnum >= cc->vessels) 253 goto bad; 254 if (isstr != 0 && isstr != 1) 255 goto bad; 256 if (isstr) { 257 int ch; 258 char *p; 259 260 for (p = buf;;) { 261 ch = getc(sync_fp); 262 *p++ = (char)ch; 263 switch (ch) { 264 case '\n': 265 p--; 266 case EOF: 267 break; 268 default: 269 if (p >= buf + sizeof buf) 270 p--; 271 continue; 272 } 273 break; 274 } 275 *p = 0; 276 for (p = buf; *p == ' '; p++) 277 ; 278 astr = p; 279 a = b = c = d = 0; 280 } else { 281 if (fscanf(sync_fp, "%ld%ld%ld%ld", &a, &b, &c, &d) != 4) 282 goto bad; 283 astr = NULL; 284 } 285 if (sync_update(type, SHIP(shipnum), astr, a, b, c, d) < 0) 286 goto bad; 287 } 288 bad: 289 erred++; 290 out: 291 if (!erred && sync_bp != sync_buf) { 292 fseek(sync_fp, 0L, SEEK_END); 293 fwrite(sync_buf, sizeof *sync_buf, sync_bp - sync_buf, 294 sync_fp); 295 fflush(sync_fp); 296 sync_bp = sync_buf; 297 } 298 sync_seek = ftell(sync_fp); 299 #ifdef LOCK_EX 300 flock(fileno(sync_fp), LOCK_UN); 301 #else 302 setegid(egid); 303 unlink(sync_lock); 304 setegid(gid); 305 #endif 306 signal(SIGHUP, sighup); 307 signal(SIGINT, sigint); 308 return erred ? -1 : 0; 309 } 310 311 static int 312 sync_update(int type, struct ship *ship, const char *astr, long a, long b, long c, long d) 313 { 314 switch (type) { 315 case W_DBP: { 316 struct BP *p = &ship->file->DBP[a]; 317 p->turnsent = b; 318 p->toship = SHIP(c); 319 p->mensent = d; 320 break; 321 } 322 case W_OBP: { 323 struct BP *p = &ship->file->OBP[a]; 324 p->turnsent = b; 325 p->toship = SHIP(c); 326 p->mensent = d; 327 break; 328 } 329 case W_FOUL: { 330 struct snag *p = &ship->file->foul[a]; 331 if (SHIP(a)->file->dir == 0) 332 break; 333 if (p->sn_count++ == 0) 334 p->sn_turn = turn; 335 ship->file->nfoul++; 336 break; 337 } 338 case W_GRAP: { 339 struct snag *p = &ship->file->grap[a]; 340 if (SHIP(a)->file->dir == 0) 341 break; 342 if (p->sn_count++ == 0) 343 p->sn_turn = turn; 344 ship->file->ngrap++; 345 break; 346 } 347 case W_UNFOUL: { 348 struct snag *p = &ship->file->foul[a]; 349 if (p->sn_count > 0) { 350 if (b) { 351 ship->file->nfoul -= p->sn_count; 352 p->sn_count = 0; 353 } else { 354 ship->file->nfoul--; 355 p->sn_count--; 356 } 357 } 358 break; 359 } 360 case W_UNGRAP: { 361 struct snag *p = &ship->file->grap[a]; 362 if (p->sn_count > 0) { 363 if (b) { 364 ship->file->ngrap -= p->sn_count; 365 p->sn_count = 0; 366 } else { 367 ship->file->ngrap--; 368 p->sn_count--; 369 } 370 } 371 break; 372 } 373 case W_SIGNAL: 374 if (mode == MODE_PLAYER) { 375 if (nobells) 376 Signal("$$: %s", ship, astr); 377 else 378 Signal("\7$$: %s", ship, astr); 379 } 380 break; 381 case W_CREW: { 382 struct shipspecs *s = ship->specs; 383 s->crew1 = a; 384 s->crew2 = b; 385 s->crew3 = c; 386 break; 387 } 388 case W_CAPTAIN: 389 strlcpy(ship->file->captain, astr, 390 sizeof ship->file->captain); 391 break; 392 case W_CAPTURED: 393 if (a < 0) 394 ship->file->captured = 0; 395 else 396 ship->file->captured = SHIP(a); 397 break; 398 case W_CLASS: 399 ship->specs->class = a; 400 break; 401 case W_DRIFT: 402 ship->file->drift = a; 403 break; 404 case W_EXPLODE: 405 if ((ship->file->explode = a) == 2) 406 ship->file->dir = 0; 407 break; 408 case W_FS: 409 ship->file->FS = a; 410 break; 411 case W_GUNL: { 412 struct shipspecs *s = ship->specs; 413 s->gunL = a; 414 s->carL = b; 415 break; 416 } 417 case W_GUNR: { 418 struct shipspecs *s = ship->specs; 419 s->gunR = a; 420 s->carR = b; 421 break; 422 } 423 case W_HULL: 424 ship->specs->hull = a; 425 break; 426 case W_MOVE: 427 strlcpy(ship->file->movebuf, astr, 428 sizeof ship->file->movebuf); 429 break; 430 case W_PCREW: 431 ship->file->pcrew = a; 432 break; 433 case W_POINTS: 434 ship->file->points = a; 435 break; 436 case W_QUAL: 437 ship->specs->qual = a; 438 break; 439 case W_RIGG: { 440 struct shipspecs *s = ship->specs; 441 s->rig1 = a; 442 s->rig2 = b; 443 s->rig3 = c; 444 s->rig4 = d; 445 break; 446 } 447 case W_RIG1: 448 ship->specs->rig1 = a; 449 break; 450 case W_RIG2: 451 ship->specs->rig2 = a; 452 break; 453 case W_RIG3: 454 ship->specs->rig3 = a; 455 break; 456 case W_RIG4: 457 ship->specs->rig4 = a; 458 break; 459 case W_COL: 460 ship->file->col = a; 461 break; 462 case W_DIR: 463 ship->file->dir = a; 464 break; 465 case W_ROW: 466 ship->file->row = a; 467 break; 468 case W_SINK: 469 if ((ship->file->sink = a) == 2) 470 ship->file->dir = 0; 471 break; 472 case W_STRUCK: 473 ship->file->struck = a; 474 break; 475 case W_TA: 476 ship->specs->ta = a; 477 break; 478 case W_ALIVE: 479 alive = 1; 480 break; 481 case W_TURN: 482 turn = a; 483 break; 484 case W_WIND: 485 winddir = a; 486 windspeed = b; 487 break; 488 case W_BEGIN: 489 strcpy(ship->file->captain, "begin"); 490 people++; 491 break; 492 case W_END: 493 *ship->file->captain = 0; 494 ship->file->points = 0; 495 people--; 496 break; 497 case W_DDEAD: 498 hasdriver = 0; 499 break; 500 default: 501 fprintf(stderr, "sync_update: unknown type %d\r\n", type); 502 return -1; 503 } 504 return 0; 505 } 506
Indexes created Wed Oct 01 19:09:53 GMT 2025