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- /*
- * Copyright (c) 1983 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)sync.c 5.6 (Berkeley) 6/1/90";
- #endif /* not lint */
-
- #include "externs.h"
- #include <sys/file.h>
- #include <sys/errno.h>
-
- #define BUFSIZE 4096
-
- static char sync_buf[BUFSIZE];
- static char *sync_bp = sync_buf;
- static char sync_lock[25];
- static char sync_file[25];
- static long sync_seek;
- static FILE *sync_fp;
- #define SF "/tmp/#sailsink.%d"
- #define LF "/tmp/#saillock.%d"
-
- /*VARARGS3*/
- makesignal(from, fmt, ship, a, b, c)
- struct ship *from;
- char *fmt;
- register struct ship *ship;
- {
- char message[80];
-
- if (ship == 0)
- (void) sprintf(message, fmt, a, b, c);
- else
- (void) sprintf(message, fmt,
- ship->shipname, colours(ship),
- sterncolour(ship), a, b, c);
- Write(W_SIGNAL, from, 1, (int)message, 0, 0, 0);
- }
-
- #include <sys/types.h>
- #include <sys/stat.h>
- sync_exists(game)
- {
- char buf[sizeof sync_file];
- struct stat s;
- time_t t;
-
- (void) sprintf(buf, SF, game);
- (void) time(&t);
- if (stat(buf, &s) < 0)
- return 0;
- if (s.st_mtime < t - 60*60*2) { /* 2 hours */
- (void) unlink(buf);
- (void) sprintf(buf, LF, game);
- (void) unlink(buf);
- return 0;
- } else
- return 1;
- }
-
- sync_open()
- {
- if (sync_fp != NULL)
- (void) fclose(sync_fp);
- (void) sprintf(sync_lock, LF, game);
- (void) sprintf(sync_file, SF, game);
- if (access(sync_file, 0) < 0) {
- int omask = umask(issetuid ? 077 : 011);
- sync_fp = fopen(sync_file, "w+");
- (void) umask(omask);
- } else
- sync_fp = fopen(sync_file, "r+");
- if (sync_fp == NULL)
- return -1;
- sync_seek = 0;
- return 0;
- }
-
- sync_close(remove)
- char remove;
- {
- if (sync_fp != 0)
- (void) fclose(sync_fp);
- if (remove)
- (void) unlink(sync_file);
- }
-
- Write(type, ship, isstr, a, b, c, d)
- int type;
- struct ship *ship;
- char isstr;
- int a, b, c, d;
- {
- if (isstr)
- (void) sprintf(sync_bp, "%d %d %d %s\n",
- type, ship->file->index, isstr, a);
- else
- (void) sprintf(sync_bp, "%d %d %d %d %d %d %d\n",
- type, ship->file->index, isstr, a, b, c, d);
- while (*sync_bp++)
- ;
- sync_bp--;
- if (sync_bp >= &sync_buf[sizeof sync_buf])
- abort();
- (void) sync_update(type, ship, a, b, c, d);
- }
-
- Sync()
- {
- sig_t sighup, sigint;
- register n;
- int type, shipnum, isstr, a, b, c, d;
- char buf[80];
- char erred = 0;
- extern errno;
-
- sighup = signal(SIGHUP, SIG_IGN);
- sigint = signal(SIGINT, SIG_IGN);
- for (n = TIMEOUT; --n >= 0;) {
- #ifdef LOCK_EX
- if (flock(fileno(sync_fp), LOCK_EX|LOCK_NB) >= 0)
- break;
- if (errno != EWOULDBLOCK)
- return -1;
- #else
- if (link(sync_file, sync_lock) >= 0)
- break;
- if (errno != EEXIST)
- return -1;
- #endif
- sleep(1);
- }
- if (n <= 0)
- return -1;
- (void) fseek(sync_fp, sync_seek, 0);
- for (;;) {
- switch (fscanf(sync_fp, "%d%d%d", &type, &shipnum, &isstr)) {
- case 3:
- break;
- case EOF:
- goto out;
- default:
- goto bad;
- }
- if (shipnum < 0 || shipnum >= cc->vessels)
- goto bad;
- if (isstr != 0 && isstr != 1)
- goto bad;
- if (isstr) {
- register char *p;
- for (p = buf;;) {
- switch (*p++ = getc(sync_fp)) {
- case '\n':
- p--;
- case EOF:
- break;
- default:
- if (p >= buf + sizeof buf)
- p--;
- continue;
- }
- break;
- }
- *p = 0;
- for (p = buf; *p == ' '; p++)
- ;
- a = (int)p;
- b = c = d = 0;
- } else
- if (fscanf(sync_fp, "%d%d%d%d", &a, &b, &c, &d) != 4)
- goto bad;
- if (sync_update(type, SHIP(shipnum), a, b, c, d) < 0)
- goto bad;
- }
- bad:
- erred++;
- out:
- if (!erred && sync_bp != sync_buf) {
- (void) fseek(sync_fp, 0L, 2);
- (void) fwrite(sync_buf, sizeof *sync_buf, sync_bp - sync_buf,
- sync_fp);
- (void) fflush(sync_fp);
- sync_bp = sync_buf;
- }
- sync_seek = ftell(sync_fp);
- #ifdef LOCK_EX
- (void) flock(fileno(sync_fp), LOCK_UN);
- #else
- (void) unlink(sync_lock);
- #endif
- (void) signal(SIGHUP, sighup);
- (void) signal(SIGINT, sigint);
- return erred ? -1 : 0;
- }
-
- sync_update(type, ship, a, b, c, d)
- int type;
- register struct ship *ship;
- int a, b, c, d;
- {
- switch (type) {
- case W_DBP: {
- register struct BP *p = &ship->file->DBP[a];
- p->turnsent = b;
- p->toship = SHIP(c);
- p->mensent = d;
- break;
- }
- case W_OBP: {
- register struct BP *p = &ship->file->OBP[a];
- p->turnsent = b;
- p->toship = SHIP(c);
- p->mensent = d;
- break;
- }
- case W_FOUL: {
- register struct snag *p = &ship->file->foul[a];
- if (SHIP(a)->file->dir == 0)
- break;
- if (p->sn_count++ == 0)
- p->sn_turn = turn;
- ship->file->nfoul++;
- break;
- }
- case W_GRAP: {
- register struct snag *p = &ship->file->grap[a];
- if (SHIP(a)->file->dir == 0)
- break;
- if (p->sn_count++ == 0)
- p->sn_turn = turn;
- ship->file->ngrap++;
- break;
- }
- case W_UNFOUL: {
- register struct snag *p = &ship->file->foul[a];
- if (p->sn_count > 0)
- if (b) {
- ship->file->nfoul -= p->sn_count;
- p->sn_count = 0;
- } else {
- ship->file->nfoul--;
- p->sn_count--;
- }
- break;
- }
- case W_UNGRAP: {
- register struct snag *p = &ship->file->grap[a];
- if (p->sn_count > 0)
- if (b) {
- ship->file->ngrap -= p->sn_count;
- p->sn_count = 0;
- } else {
- ship->file->ngrap--;
- p->sn_count--;
- }
- break;
- }
- case W_SIGNAL:
- if (mode == MODE_PLAYER)
- if (nobells)
- Signal("%s (%c%c): %s", ship, a);
- else
- Signal("\7%s (%c%c): %s", ship, a);
- break;
- case W_CREW: {
- register struct shipspecs *s = ship->specs;
- s->crew1 = a;
- s->crew2 = b;
- s->crew3 = c;
- break;
- }
- case W_CAPTAIN:
- (void) strncpy(ship->file->captain, (char *)a,
- sizeof ship->file->captain - 1);
- ship->file->captain[sizeof ship->file->captain - 1] = 0;
- break;
- case W_CAPTURED:
- if (a < 0)
- ship->file->captured = 0;
- else
- ship->file->captured = SHIP(a);
- break;
- case W_CLASS:
- ship->specs->class = a;
- break;
- case W_DRIFT:
- ship->file->drift = a;
- break;
- case W_EXPLODE:
- if ((ship->file->explode = a) == 2)
- ship->file->dir = 0;
- break;
- case W_FS:
- ship->file->FS = a;
- break;
- case W_GUNL: {
- register struct shipspecs *s = ship->specs;
- s->gunL = a;
- s->carL = b;
- break;
- }
- case W_GUNR: {
- register struct shipspecs *s = ship->specs;
- s->gunR = a;
- s->carR = b;
- break;
- }
- case W_HULL:
- ship->specs->hull = a;
- break;
- case W_MOVE:
- (void) strncpy(ship->file->movebuf, (char *)a,
- sizeof ship->file->movebuf - 1);
- ship->file->movebuf[sizeof ship->file->movebuf - 1] = 0;
- break;
- case W_PCREW:
- ship->file->pcrew = a;
- break;
- case W_POINTS:
- ship->file->points = a;
- break;
- case W_QUAL:
- ship->specs->qual = a;
- break;
- case W_RIGG: {
- register struct shipspecs *s = ship->specs;
- s->rig1 = a;
- s->rig2 = b;
- s->rig3 = c;
- s->rig4 = d;
- break;
- }
- case W_RIG1:
- ship->specs->rig1 = a;
- break;
- case W_RIG2:
- ship->specs->rig2 = a;
- break;
- case W_RIG3:
- ship->specs->rig3 = a;
- break;
- case W_RIG4:
- ship->specs->rig4 = a;
- break;
- case W_COL:
- ship->file->col = a;
- break;
- case W_DIR:
- ship->file->dir = a;
- break;
- case W_ROW:
- ship->file->row = a;
- break;
- case W_SINK:
- if ((ship->file->sink = a) == 2)
- ship->file->dir = 0;
- break;
- case W_STRUCK:
- ship->file->struck = a;
- break;
- case W_TA:
- ship->specs->ta = a;
- break;
- case W_ALIVE:
- alive = 1;
- break;
- case W_TURN:
- turn = a;
- break;
- case W_WIND:
- winddir = a;
- windspeed = b;
- break;
- case W_BEGIN:
- (void) strcpy(ship->file->captain, "begin");
- people++;
- break;
- case W_END:
- *ship->file->captain = 0;
- ship->file->points = 0;
- people--;
- break;
- case W_DDEAD:
- hasdriver = 0;
- break;
- default:
- fprintf(stderr, "sync_update: unknown type %d\r\n", type);
- return -1;
- }
- return 0;
- }
-