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BSD 4_4_Lite2 release
[unix-history] / usr / src / games / sail / sync.c
/*
* Copyright (c) 1983, 1993
* The 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 8.2 (Berkeley) 4/28/95";
#endif /* not lint */
#include <sys/file.h>
#include <errno.h>
#include "extern.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;
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.