sync.c revision 1.22
1 /* $NetBSD: sync.c,v 1.22 2004/01/27 20:27:59 jsm 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 1.22 2004/01/27 20:27:59 jsm 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 vsprintf(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 vsprintf(message, fmt, ap); 116 va_end(ap); 117 Writestr(W_SIGNAL, from, message); 118 } 119 120 int 121 sync_exists(int game) 122 { 123 char buf[sizeof sync_file]; 124 struct stat s; 125 time_t t; 126 127 sprintf(buf, SF, game); 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 sprintf(buf, LF, game); 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 sprintf(sync_lock, LF, game); 153 sprintf(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 remove) 170 { 171 if (sync_fp != 0) 172 fclose(sync_fp); 173 if (remove) { 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 { 183 184 sprintf(sync_bp, "%d %d 0 %ld %ld %ld %ld\n", 185 type, ship->file->index, a, b, c, d); 186 while (*sync_bp++) 187 ; 188 sync_bp--; 189 if (sync_bp >= &sync_buf[sizeof sync_buf]) 190 abort(); 191 sync_update(type, ship, NULL, a, b, c, d); 192 } 193 194 void 195 Writestr(int type, struct ship *ship, const char *a) 196 { 197 sprintf(sync_bp, "%d %d 1 %s\n", type, ship->file->index, a); 198 while (*sync_bp++) 199 ; 200 sync_bp--; 201 if (sync_bp >= &sync_buf[sizeof sync_buf]) 202 abort(); 203 sync_update(type, ship, a, 0, 0, 0, 0); 204 } 205 206 int 207 Sync(void) 208 { 209 sig_t sighup, sigint; 210 int n; 211 int type, shipnum, isstr; 212 char *astr; 213 long a, b, c, d; 214 char buf[80]; 215 char erred = 0; 216 217 sighup = signal(SIGHUP, SIG_IGN); 218 sigint = signal(SIGINT, SIG_IGN); 219 for (n = TIMEOUT; --n >= 0;) { 220 #ifdef LOCK_EX 221 if (flock(fileno(sync_fp), LOCK_EX|LOCK_NB) >= 0) 222 break; 223 if (errno != EWOULDBLOCK) 224 return -1; 225 #else 226 setegid(egid); 227 if (link(sync_file, sync_lock) >= 0) { 228 setegid(gid); 229 break; 230 } 231 setegid(gid); 232 if (errno != EEXIST) 233 return -1; 234 #endif 235 sleep(1); 236 } 237 if (n <= 0) 238 return -1; 239 fseek(sync_fp, sync_seek, SEEK_SET); 240 for (;;) { 241 switch (fscanf(sync_fp, "%d%d%d", &type, &shipnum, &isstr)) { 242 case 3: 243 break; 244 case EOF: 245 goto out; 246 default: 247 goto bad; 248 } 249 if (shipnum < 0 || shipnum >= cc->vessels) 250 goto bad; 251 if (isstr != 0 && isstr != 1) 252 goto bad; 253 if (isstr) { 254 char *p; 255 for (p = buf;;) { 256 switch (*p++ = getc(sync_fp)) { 257 case '\n': 258 p--; 259 case EOF: 260 break; 261 default: 262 if (p >= buf + sizeof buf) 263 p--; 264 continue; 265 } 266 break; 267 } 268 *p = 0; 269 for (p = buf; *p == ' '; p++) 270 ; 271 astr = p; 272 a = b = c = d = 0; 273 } else { 274 if (fscanf(sync_fp, "%ld%ld%ld%ld", &a, &b, &c, &d) != 4) 275 goto bad; 276 astr = NULL; 277 } 278 if (sync_update(type, SHIP(shipnum), astr, a, b, c, d) < 0) 279 goto bad; 280 } 281 bad: 282 erred++; 283 out: 284 if (!erred && sync_bp != sync_buf) { 285 fseek(sync_fp, 0L, SEEK_END); 286 fwrite(sync_buf, sizeof *sync_buf, sync_bp - sync_buf, 287 sync_fp); 288 fflush(sync_fp); 289 sync_bp = sync_buf; 290 } 291 sync_seek = ftell(sync_fp); 292 #ifdef LOCK_EX 293 flock(fileno(sync_fp), LOCK_UN); 294 #else 295 setegid(egid); 296 unlink(sync_lock); 297 setegid(gid); 298 #endif 299 signal(SIGHUP, sighup); 300 signal(SIGINT, sigint); 301 return erred ? -1 : 0; 302 } 303 304 static int 305 sync_update(int type, struct ship *ship, const char *astr, long a, long b, long c, long d) 306 { 307 switch (type) { 308 case W_DBP: { 309 struct BP *p = &ship->file->DBP[a]; 310 p->turnsent = b; 311 p->toship = SHIP(c); 312 p->mensent = d; 313 break; 314 } 315 case W_OBP: { 316 struct BP *p = &ship->file->OBP[a]; 317 p->turnsent = b; 318 p->toship = SHIP(c); 319 p->mensent = d; 320 break; 321 } 322 case W_FOUL: { 323 struct snag *p = &ship->file->foul[a]; 324 if (SHIP(a)->file->dir == 0) 325 break; 326 if (p->sn_count++ == 0) 327 p->sn_turn = turn; 328 ship->file->nfoul++; 329 break; 330 } 331 case W_GRAP: { 332 struct snag *p = &ship->file->grap[a]; 333 if (SHIP(a)->file->dir == 0) 334 break; 335 if (p->sn_count++ == 0) 336 p->sn_turn = turn; 337 ship->file->ngrap++; 338 break; 339 } 340 case W_UNFOUL: { 341 struct snag *p = &ship->file->foul[a]; 342 if (p->sn_count > 0) { 343 if (b) { 344 ship->file->nfoul -= p->sn_count; 345 p->sn_count = 0; 346 } else { 347 ship->file->nfoul--; 348 p->sn_count--; 349 } 350 } 351 break; 352 } 353 case W_UNGRAP: { 354 struct snag *p = &ship->file->grap[a]; 355 if (p->sn_count > 0) { 356 if (b) { 357 ship->file->ngrap -= p->sn_count; 358 p->sn_count = 0; 359 } else { 360 ship->file->ngrap--; 361 p->sn_count--; 362 } 363 } 364 break; 365 } 366 case W_SIGNAL: 367 if (mode == MODE_PLAYER) { 368 if (nobells) 369 Signal("$$: %s", ship, astr); 370 else 371 Signal("\7$$: %s", ship, astr); 372 } 373 break; 374 case W_CREW: { 375 struct shipspecs *s = ship->specs; 376 s->crew1 = a; 377 s->crew2 = b; 378 s->crew3 = c; 379 break; 380 } 381 case W_CAPTAIN: 382 strncpy(ship->file->captain, astr, 383 sizeof ship->file->captain - 1); 384 ship->file->captain[sizeof ship->file->captain - 1] = 0; 385 break; 386 case W_CAPTURED: 387 if (a < 0) 388 ship->file->captured = 0; 389 else 390 ship->file->captured = SHIP(a); 391 break; 392 case W_CLASS: 393 ship->specs->class = a; 394 break; 395 case W_DRIFT: 396 ship->file->drift = a; 397 break; 398 case W_EXPLODE: 399 if ((ship->file->explode = a) == 2) 400 ship->file->dir = 0; 401 break; 402 case W_FS: 403 ship->file->FS = a; 404 break; 405 case W_GUNL: { 406 struct shipspecs *s = ship->specs; 407 s->gunL = a; 408 s->carL = b; 409 break; 410 } 411 case W_GUNR: { 412 struct shipspecs *s = ship->specs; 413 s->gunR = a; 414 s->carR = b; 415 break; 416 } 417 case W_HULL: 418 ship->specs->hull = a; 419 break; 420 case W_MOVE: 421 strncpy(ship->file->movebuf, astr, 422 sizeof ship->file->movebuf - 1); 423 ship->file->movebuf[sizeof ship->file->movebuf - 1] = 0; 424 break; 425 case W_PCREW: 426 ship->file->pcrew = a; 427 break; 428 case W_POINTS: 429 ship->file->points = a; 430 break; 431 case W_QUAL: 432 ship->specs->qual = a; 433 break; 434 case W_RIGG: { 435 struct shipspecs *s = ship->specs; 436 s->rig1 = a; 437 s->rig2 = b; 438 s->rig3 = c; 439 s->rig4 = d; 440 break; 441 } 442 case W_RIG1: 443 ship->specs->rig1 = a; 444 break; 445 case W_RIG2: 446 ship->specs->rig2 = a; 447 break; 448 case W_RIG3: 449 ship->specs->rig3 = a; 450 break; 451 case W_RIG4: 452 ship->specs->rig4 = a; 453 break; 454 case W_COL: 455 ship->file->col = a; 456 break; 457 case W_DIR: 458 ship->file->dir = a; 459 break; 460 case W_ROW: 461 ship->file->row = a; 462 break; 463 case W_SINK: 464 if ((ship->file->sink = a) == 2) 465 ship->file->dir = 0; 466 break; 467 case W_STRUCK: 468 ship->file->struck = a; 469 break; 470 case W_TA: 471 ship->specs->ta = a; 472 break; 473 case W_ALIVE: 474 alive = 1; 475 break; 476 case W_TURN: 477 turn = a; 478 break; 479 case W_WIND: 480 winddir = a; 481 windspeed = b; 482 break; 483 case W_BEGIN: 484 strcpy(ship->file->captain, "begin"); 485 people++; 486 break; 487 case W_END: 488 *ship->file->captain = 0; 489 ship->file->points = 0; 490 people--; 491 break; 492 case W_DDEAD: 493 hasdriver = 0; 494 break; 495 default: 496 fprintf(stderr, "sync_update: unknown type %d\r\n", type); 497 return -1; 498 } 499 return 0; 500 } 501
Indexes created Wed Oct 01 19:09:53 GMT 2025