games/sail/sync.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)sync.c   8.1 (Berkeley) 5/31/93
  34  * $FreeBSD: src/games/sail/sync.c,v 1.9 1999/11/30 03:49:38 billf Exp $
  35  * $DragonFly: src/games/sail/sync.c,v 1.3 2005/04/29 09:22:57 joerg Exp $
  36  */
  37
  38 #include "externs.h"
  39 #include <sys/file.h>
  40 #include <sys/errno.h>
  41
  42 #define BUFSIZE 4096
  43
  44 static char sync_buf[BUFSIZE];
  45 static char *sync_bp = sync_buf;
  46 static char sync_lock[25];
  47 static char sync_file[25];
  48 static long sync_seek;
  49 static FILE *sync_fp;
  50 #define SF "/tmp/#sailsink.%d"
  51 #define LF "/tmp/#saillock.%d"
  52
  53 /*VARARGS3*/
  54 makesignal(from, fmt, ship, a, b, c)
  55         struct ship *from;
  56         char *fmt;
  57         struct ship *ship;
  58 {
  59         char message[80];
  60
  61         if (ship == 0)
  62                 (void) sprintf(message, fmt, a, b, c);
  63         else
  64                 (void) sprintf(message, fmt,
  65                         ship->shipname, colours(ship),
  66                         sterncolour(ship), a, b, c);
  67         Write(W_SIGNAL, from, 1, (long)message, 0, 0, 0);
  68 }
  69
  70 #include <sys/types.h>
  71 #include <sys/stat.h>
  72 sync_exists(game)
  73 int game;
  74 {
  75         char buf[sizeof sync_file];
  76         struct stat s;
  77         time_t t;
  78
  79         (void) sprintf(buf, SF, game);
  80         (void) time(&t);
  81         if (stat(buf, &s) < 0)
  82                 return 0;
  83         if (s.st_mtime < t - 60*60*2) {         /* 2 hours */
  84                 (void) unlink(buf);
  85                 (void) sprintf(buf, LF, game);
  86                 (void) unlink(buf);
  87                 return 0;
  88         } else
  89                 return 1;
  90 }
  91
  92 sync_open()
  93 {
  94         if (sync_fp != NULL)
  95                 (void) fclose(sync_fp);
  96         (void) sprintf(sync_lock, LF, game);
  97         (void) sprintf(sync_file, SF, game);
  98         if (access(sync_file, 0) < 0) {
  99                 int omask = umask(issetuid ? 077 : 011);
 100                 sync_fp = fopen(sync_file, "w+");
 101                 (void) umask(omask);
 102         } else
 103                 sync_fp = fopen(sync_file, "r+");
 104         if (sync_fp == NULL)
 105                 return -1;
 106         sync_seek = 0;
 107         return 0;
 108 }
 109
 110 sync_close(remove)
 111         char remove;
 112 {
 113         if (sync_fp != 0)
 114                 (void) fclose(sync_fp);
 115         if (remove)
 116                 (void) unlink(sync_file);
 117 }
 118
 119 Write(type, ship, isstr, a, b, c, d)
 120         int type;
 121         struct ship *ship;
 122         char isstr;
 123         int a, b, c, d;
 124 {
 125         if (isstr)
 126                 (void) sprintf(sync_bp, "%d %d %d %s\n",
 127                         type, ship->file->index, isstr, (char *)a);
 128         else
 129                 (void) sprintf(sync_bp, "%d %d %d %d %d %d %d\n",
 130                         type, ship->file->index, isstr, a, b, c, d);
 131         while (*sync_bp++)
 132                 ;
 133         sync_bp--;
 134         if (sync_bp >= &sync_buf[sizeof sync_buf])
 135                 abort();
 136         (void) sync_update(type, ship, a, b, c, d);
 137 }
 138
 139 Sync()
 140 {
 141         sig_t sighup, sigint;
 142         int n;
 143         int type, shipnum, isstr, a, b, c, d;
 144         char buf[80];
 145         char erred = 0;
 146         sighup = signal(SIGHUP, SIG_IGN);
 147         sigint = signal(SIGINT, SIG_IGN);
 148         for (n = TIMEOUT; --n >= 0;) {
 149 #ifdef LOCK_EX
 150                 if (flock(fileno(sync_fp), LOCK_EX|LOCK_NB) >= 0)
 151                         break;
 152                 if (errno != EWOULDBLOCK)
 153                         return -1;
 154 #else
 155                 if (link(sync_file, sync_lock) >= 0)
 156                         break;
 157                 if (errno != EEXIST)
 158                         return -1;
 159 #endif
 160                 sleep(1);
 161         }
 162         if (n <= 0)
 163                 return -1;
 164         (void) fseek(sync_fp, sync_seek, 0);
 165         for (;;) {
 166                 switch (fscanf(sync_fp, "%d%d%d", &type, &shipnum, &isstr)) {
 167                 case 3:
 168                         break;
 169                 case EOF:
 170                         goto out;
 171                 default:
 172                         goto bad;
 173                 }
 174                 if (shipnum < 0 || shipnum >= cc->vessels)
 175                         goto bad;
 176                 if (isstr != 0 && isstr != 1)
 177                         goto bad;
 178                 if (isstr) {
 179                         char *p;
 180                         for (p = buf;;) {
 181                                 switch (*p++ = getc(sync_fp)) {
 182                                 case '\n':
 183                                         p--;
 184                                 case EOF:
 185                                         break;
 186                                 default:
 187                                         if (p >= buf + sizeof buf)
 188                                                 p--;
 189                                         continue;
 190                                 }
 191                                 break;
 192                         }
 193                         *p = 0;
 194                         for (p = buf; *p == ' '; p++)
 195                                 ;
 196                         a = (long)p;
 197                         b = c = d = 0;
 198                 } else
 199                         if (fscanf(sync_fp, "%d%d%d%d", &a, &b, &c, &d) != 4)
 200                                 goto bad;
 201                 if (sync_update(type, SHIP(shipnum), a, b, c, d) < 0)
 202                         goto bad;
 203         }
 204 bad:
 205         erred++;
 206 out:
 207         if (!erred && sync_bp != sync_buf) {
 208                 (void) fseek(sync_fp, 0L, 2);
 209                 (void) fwrite(sync_buf, sizeof *sync_buf, sync_bp - sync_buf,
 210                         sync_fp);
 211                 (void) fflush(sync_fp);
 212                 sync_bp = sync_buf;
 213         }
 214         sync_seek = ftell(sync_fp);
 215 #ifdef LOCK_EX
 216         (void) flock(fileno(sync_fp), LOCK_UN);
 217 #else
 218         (void) unlink(sync_lock);
 219 #endif
 220         (void) signal(SIGHUP, sighup);
 221         (void) signal(SIGINT, sigint);
 222         return erred ? -1 : 0;
 223 }
 224
 225 sync_update(type, ship, a, b, c, d)
 226         int type;
 227         struct ship *ship;
 228         long a, b, c, d;
 229 {
 230         switch (type) {
 231         case W_DBP: {
 232                 struct BP *p = &ship->file->DBP[a];
 233                 p->turnsent = b;
 234                 p->toship = SHIP(c);
 235                 p->mensent = d;
 236                 break;
 237                 }
 238         case W_OBP: {
 239                 struct BP *p = &ship->file->OBP[a];
 240                 p->turnsent = b;
 241                 p->toship = SHIP(c);
 242                 p->mensent = d;
 243                 break;
 244                 }
 245         case W_FOUL: {
 246                 struct snag *p = &ship->file->foul[a];
 247                 if (SHIP(a)->file->dir == 0)
 248                         break;
 249                 if (p->sn_count++ == 0)
 250                         p->sn_turn = turn;
 251                 ship->file->nfoul++;
 252                 break;
 253                 }
 254         case W_GRAP: {
 255                 struct snag *p = &ship->file->grap[a];
 256                 if (SHIP(a)->file->dir == 0)
 257                         break;
 258                 if (p->sn_count++ == 0)
 259                         p->sn_turn = turn;
 260                 ship->file->ngrap++;
 261                 break;
 262                 }
 263         case W_UNFOUL: {
 264                 struct snag *p = &ship->file->foul[a];
 265                 if (p->sn_count > 0) {
 266                         if (b) {
 267                                 ship->file->nfoul -= p->sn_count;
 268                                 p->sn_count = 0;
 269                         } else {
 270                                 ship->file->nfoul--;
 271                                 p->sn_count--;
 272                         }
 273                 }
 274                 break;
 275                 }
 276         case W_UNGRAP: {
 277                 struct snag *p = &ship->file->grap[a];
 278                 if (p->sn_count > 0) {
 279                         if (b) {
 280                                 ship->file->ngrap -= p->sn_count;
 281                                 p->sn_count = 0;
 282                         } else {
 283                                 ship->file->ngrap--;
 284                                 p->sn_count--;
 285                         }
 286                 }
 287                 break;
 288                 }
 289         case W_SIGNAL:
 290                 if (mode == MODE_PLAYER) {
 291                         if (nobells)
 292                                 Signal("%s (%c%c): %s", ship, a);
 293                         else
 294                                 Signal("\7%s (%c%c): %s", ship, a);
 295                 }
 296                 break;
 297         case W_CREW: {
 298                 struct shipspecs *s = ship->specs;
 299                 s->crew1 = a;
 300                 s->crew2 = b;
 301                 s->crew3 = c;
 302                 break;
 303                 }
 304         case W_CAPTAIN:
 305                 (void) strncpy(ship->file->captain, (char *)a,
 306                         sizeof ship->file->captain - 1);
 307                 ship->file->captain[sizeof ship->file->captain - 1] = 0;
 308                 break;
 309         case W_CAPTURED:
 310                 if (a < 0)
 311                         ship->file->captured = 0;
 312                 else
 313                         ship->file->captured = SHIP(a);
 314                 break;
 315         case W_CLASS:
 316                 ship->specs->class = a;
 317                 break;
 318         case W_DRIFT:
 319                 ship->file->drift = a;
 320                 break;
 321         case W_EXPLODE:
 322                 if ((ship->file->explode = a) == 2)
 323                         ship->file->dir = 0;
 324                 break;
 325         case W_FS:
 326                 ship->file->FS = a;
 327                 break;
 328         case W_GUNL: {
 329                 struct shipspecs *s = ship->specs;
 330                 s->gunL = a;
 331                 s->carL = b;
 332                 break;
 333                 }
 334         case W_GUNR: {
 335                 struct shipspecs *s = ship->specs;
 336                 s->gunR = a;
 337                 s->carR = b;
 338                 break;
 339                 }
 340         case W_HULL:
 341                 ship->specs->hull = a;
 342                 break;
 343         case W_MOVE:
 344                 (void) strncpy(ship->file->movebuf, (char *)a,
 345                         sizeof ship->file->movebuf - 1);
 346                 ship->file->movebuf[sizeof ship->file->movebuf - 1] = 0;
 347                 break;
 348         case W_PCREW:
 349                 ship->file->pcrew = a;
 350                 break;
 351         case W_POINTS:
 352                 ship->file->points = a;
 353                 break;
 354         case W_QUAL:
 355                 ship->specs->qual = a;
 356                 break;
 357         case W_RIGG: {
 358                 struct shipspecs *s = ship->specs;
 359                 s->rig1 = a;
 360                 s->rig2 = b;
 361                 s->rig3 = c;
 362                 s->rig4 = d;
 363                 break;
 364                 }
 365         case W_RIG1:
 366                 ship->specs->rig1 = a;
 367                 break;
 368         case W_RIG2:
 369                 ship->specs->rig2 = a;
 370                 break;
 371         case W_RIG3:
 372                 ship->specs->rig3 = a;
 373                 break;
 374         case W_RIG4:
 375                 ship->specs->rig4 = a;
 376                 break;
 377         case W_COL:
 378                 ship->file->col = a;
 379                 break;
 380         case W_DIR:
 381                 ship->file->dir = a;
 382                 break;
 383         case W_ROW:
 384                 ship->file->row = a;
 385                 break;
 386         case W_SINK:
 387                 if ((ship->file->sink = a) == 2)
 388                         ship->file->dir = 0;
 389                 break;
 390         case W_STRUCK:
 391                 ship->file->struck = a;
 392                 break;
 393         case W_TA:
 394                 ship->specs->ta = a;
 395                 break;
 396         case W_ALIVE:
 397                 alive = 1;
 398                 break;
 399         case W_TURN:
 400                 turn = a;
 401                 break;
 402         case W_WIND:
 403                 winddir = a;
 404                 windspeed = b;
 405                 break;
 406         case W_BEGIN:
 407                 (void) strcpy(ship->file->captain, "begin");
 408                 people++;
 409                 break;
 410         case W_END:
 411                 *ship->file->captain = 0;
 412                 ship->file->points = 0;
 413                 people--;
 414                 break;
 415         case W_DDEAD:
 416                 hasdriver = 0;
 417                 break;
 418         default:
 419                 fprintf(stderr, "sync_update: unknown type %d\r\n", type);
 420                 return -1;
 421         }
 422         return 0;
 423 }