426 lines
9.1 KiB
C
426 lines
9.1 KiB
C
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)sync.c 8.1 (Berkeley) 5/31/93";
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#endif /* not lint */
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#include "externs.h"
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#include <sys/file.h>
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#include <sys/errno.h>
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#define BUFSIZE 4096
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static char sync_buf[BUFSIZE];
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static char *sync_bp = sync_buf;
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static char sync_lock[25];
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static char sync_file[25];
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static long sync_seek;
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static FILE *sync_fp;
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#define SF "/tmp/#sailsink.%d"
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#define LF "/tmp/#saillock.%d"
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/*VARARGS3*/
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makesignal(from, fmt, ship, a, b, c)
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struct ship *from;
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char *fmt;
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register struct ship *ship;
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{
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char message[80];
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if (ship == 0)
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(void) sprintf(message, fmt, a, b, c);
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else
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(void) sprintf(message, fmt,
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ship->shipname, colours(ship),
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sterncolour(ship), a, b, c);
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Write(W_SIGNAL, from, 1, (long)message, 0, 0, 0);
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}
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#include <sys/types.h>
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#include <sys/stat.h>
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sync_exists(game)
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int game;
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{
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char buf[sizeof sync_file];
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struct stat s;
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time_t t;
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(void) sprintf(buf, SF, game);
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(void) time(&t);
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if (stat(buf, &s) < 0)
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return 0;
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if (s.st_mtime < t - 60*60*2) { /* 2 hours */
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(void) unlink(buf);
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(void) sprintf(buf, LF, game);
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(void) unlink(buf);
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return 0;
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} else
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return 1;
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}
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sync_open()
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{
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if (sync_fp != NULL)
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(void) fclose(sync_fp);
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(void) sprintf(sync_lock, LF, game);
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(void) sprintf(sync_file, SF, game);
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if (access(sync_file, 0) < 0) {
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int omask = umask(issetuid ? 077 : 011);
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sync_fp = fopen(sync_file, "w+");
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(void) umask(omask);
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} else
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sync_fp = fopen(sync_file, "r+");
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if (sync_fp == NULL)
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return -1;
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sync_seek = 0;
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return 0;
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}
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sync_close(remove)
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char remove;
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{
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if (sync_fp != 0)
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(void) fclose(sync_fp);
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if (remove)
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(void) unlink(sync_file);
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}
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Write(type, ship, isstr, a, b, c, d)
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int type;
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struct ship *ship;
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char isstr;
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int a, b, c, d;
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{
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if (isstr)
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(void) sprintf(sync_bp, "%d %d %d %s\n",
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type, ship->file->index, isstr, (char *)a);
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else
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(void) sprintf(sync_bp, "%d %d %d %d %d %d %d\n",
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type, ship->file->index, isstr, a, b, c, d);
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while (*sync_bp++)
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;
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sync_bp--;
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if (sync_bp >= &sync_buf[sizeof sync_buf])
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abort();
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(void) sync_update(type, ship, a, b, c, d);
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}
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Sync()
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{
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sig_t sighup, sigint;
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register n;
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int type, shipnum, isstr, a, b, c, d;
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char buf[80];
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char erred = 0;
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extern errno;
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sighup = signal(SIGHUP, SIG_IGN);
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sigint = signal(SIGINT, SIG_IGN);
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for (n = TIMEOUT; --n >= 0;) {
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#ifdef LOCK_EX
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if (flock(fileno(sync_fp), LOCK_EX|LOCK_NB) >= 0)
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break;
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if (errno != EWOULDBLOCK)
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return -1;
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#else
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if (link(sync_file, sync_lock) >= 0)
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break;
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if (errno != EEXIST)
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return -1;
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#endif
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sleep(1);
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}
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if (n <= 0)
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return -1;
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(void) fseek(sync_fp, sync_seek, 0);
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for (;;) {
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switch (fscanf(sync_fp, "%d%d%d", &type, &shipnum, &isstr)) {
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case 3:
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break;
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case EOF:
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goto out;
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default:
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goto bad;
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}
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if (shipnum < 0 || shipnum >= cc->vessels)
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goto bad;
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if (isstr != 0 && isstr != 1)
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goto bad;
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if (isstr) {
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register char *p;
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for (p = buf;;) {
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switch (*p++ = getc(sync_fp)) {
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case '\n':
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p--;
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case EOF:
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break;
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default:
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if (p >= buf + sizeof buf)
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p--;
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continue;
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}
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break;
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}
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*p = 0;
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for (p = buf; *p == ' '; p++)
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;
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a = (long)p;
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b = c = d = 0;
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} else
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if (fscanf(sync_fp, "%d%d%d%d", &a, &b, &c, &d) != 4)
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goto bad;
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if (sync_update(type, SHIP(shipnum), a, b, c, d) < 0)
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goto bad;
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}
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bad:
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erred++;
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out:
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if (!erred && sync_bp != sync_buf) {
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(void) fseek(sync_fp, 0L, 2);
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(void) fwrite(sync_buf, sizeof *sync_buf, sync_bp - sync_buf,
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sync_fp);
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(void) fflush(sync_fp);
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sync_bp = sync_buf;
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}
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sync_seek = ftell(sync_fp);
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#ifdef LOCK_EX
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(void) flock(fileno(sync_fp), LOCK_UN);
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#else
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(void) unlink(sync_lock);
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#endif
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(void) signal(SIGHUP, sighup);
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(void) signal(SIGINT, sigint);
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return erred ? -1 : 0;
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}
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sync_update(type, ship, a, b, c, d)
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int type;
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register struct ship *ship;
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long a, b, c, d;
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{
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switch (type) {
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case W_DBP: {
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register struct BP *p = &ship->file->DBP[a];
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p->turnsent = b;
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p->toship = SHIP(c);
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p->mensent = d;
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break;
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}
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case W_OBP: {
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register struct BP *p = &ship->file->OBP[a];
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p->turnsent = b;
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p->toship = SHIP(c);
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p->mensent = d;
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break;
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}
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case W_FOUL: {
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register struct snag *p = &ship->file->foul[a];
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if (SHIP(a)->file->dir == 0)
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break;
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if (p->sn_count++ == 0)
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p->sn_turn = turn;
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ship->file->nfoul++;
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break;
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}
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case W_GRAP: {
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register struct snag *p = &ship->file->grap[a];
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if (SHIP(a)->file->dir == 0)
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break;
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if (p->sn_count++ == 0)
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p->sn_turn = turn;
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ship->file->ngrap++;
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break;
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}
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case W_UNFOUL: {
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register struct snag *p = &ship->file->foul[a];
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if (p->sn_count > 0) {
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if (b) {
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ship->file->nfoul -= p->sn_count;
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p->sn_count = 0;
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} else {
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ship->file->nfoul--;
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p->sn_count--;
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}
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}
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break;
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}
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case W_UNGRAP: {
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register struct snag *p = &ship->file->grap[a];
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if (p->sn_count > 0) {
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if (b) {
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ship->file->ngrap -= p->sn_count;
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p->sn_count = 0;
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} else {
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ship->file->ngrap--;
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p->sn_count--;
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}
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}
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break;
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}
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case W_SIGNAL:
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if (mode == MODE_PLAYER) {
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if (nobells)
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Signal("%s (%c%c): %s", ship, a);
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else
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Signal("\7%s (%c%c): %s", ship, a);
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}
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break;
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case W_CREW: {
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register struct shipspecs *s = ship->specs;
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s->crew1 = a;
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s->crew2 = b;
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s->crew3 = c;
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break;
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}
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case W_CAPTAIN:
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(void) strncpy(ship->file->captain, (char *)a,
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sizeof ship->file->captain - 1);
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ship->file->captain[sizeof ship->file->captain - 1] = 0;
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break;
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case W_CAPTURED:
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if (a < 0)
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ship->file->captured = 0;
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else
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ship->file->captured = SHIP(a);
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break;
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case W_CLASS:
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ship->specs->class = a;
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break;
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case W_DRIFT:
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ship->file->drift = a;
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break;
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case W_EXPLODE:
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if ((ship->file->explode = a) == 2)
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ship->file->dir = 0;
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break;
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case W_FS:
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ship->file->FS = a;
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break;
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case W_GUNL: {
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register struct shipspecs *s = ship->specs;
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s->gunL = a;
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s->carL = b;
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break;
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}
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case W_GUNR: {
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register struct shipspecs *s = ship->specs;
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s->gunR = a;
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s->carR = b;
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break;
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}
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case W_HULL:
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ship->specs->hull = a;
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break;
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case W_MOVE:
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(void) strncpy(ship->file->movebuf, (char *)a,
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sizeof ship->file->movebuf - 1);
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ship->file->movebuf[sizeof ship->file->movebuf - 1] = 0;
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break;
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case W_PCREW:
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ship->file->pcrew = a;
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break;
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case W_POINTS:
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ship->file->points = a;
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break;
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case W_QUAL:
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ship->specs->qual = a;
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break;
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case W_RIGG: {
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register struct shipspecs *s = ship->specs;
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s->rig1 = a;
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s->rig2 = b;
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s->rig3 = c;
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s->rig4 = d;
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break;
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}
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case W_RIG1:
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ship->specs->rig1 = a;
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break;
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case W_RIG2:
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ship->specs->rig2 = a;
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break;
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case W_RIG3:
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ship->specs->rig3 = a;
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break;
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case W_RIG4:
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ship->specs->rig4 = a;
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break;
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case W_COL:
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ship->file->col = a;
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break;
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case W_DIR:
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ship->file->dir = a;
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break;
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case W_ROW:
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ship->file->row = a;
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break;
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case W_SINK:
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if ((ship->file->sink = a) == 2)
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ship->file->dir = 0;
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break;
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case W_STRUCK:
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ship->file->struck = a;
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break;
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case W_TA:
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ship->specs->ta = a;
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break;
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case W_ALIVE:
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alive = 1;
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break;
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case W_TURN:
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turn = a;
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break;
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case W_WIND:
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winddir = a;
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windspeed = b;
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break;
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case W_BEGIN:
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(void) strcpy(ship->file->captain, "begin");
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people++;
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break;
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case W_END:
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*ship->file->captain = 0;
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ship->file->points = 0;
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people--;
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break;
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case W_DDEAD:
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hasdriver = 0;
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break;
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default:
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fprintf(stderr, "sync_update: unknown type %d\r\n", type);
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return -1;
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}
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return 0;
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}
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