+#ifndef lint
+static char *sccsid = "@(#)sync.c 1.1 83/10/10";
+#endif
+
+#include "externs.h"
+
+static char sync_buf[BUFSIZE];
+static char *sync_bufp = 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);
+}
+
+sync_exists(game)
+{
+ char buf[sizeof sync_file];
+
+ (void) sprintf(buf, SF, game);
+ return access(buf, 0) >= 0;
+}
+
+sync_open()
+{
+ (void) sprintf(sync_lock, LF, game);
+ (void) sprintf(sync_file, SF, game);
+ if (access(sync_file, 0) < 0) {
+ int omask;
+#ifdef SETUID
+ omask = umask(077);
+#else
+ omask = umask(011);
+#endif
+ sync_fp = fopen(sync_file, "w+");
+ (void) umask(omask);
+ } else
+ sync_fp = fopen(sync_file, "r+");
+ if (sync_fp == 0)
+ return -1;
+ sync_seek == 0;
+}
+
+sync_close(remove)
+char remove;
+{
+ (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_bufp, "%d %d %d %s\n",
+ type, ship-SHIP(0), isstr, a);
+ else
+ (void) sprintf(sync_bufp, "%d %d %d %d %d %d %d\n",
+ type, ship-SHIP(0), isstr, a, b, c, d);
+ while (*sync_bufp++)
+ ;
+ sync_bufp--;
+ if (sync_bufp >= &sync_buf[sizeof sync_buf])
+ abort();
+ sync_update(type, ship, a, b, c, d);
+}
+
+Sync()
+{
+ int (*sig1)(), (*sig2)();
+ int type, shipnum, isstr, a, b, c, d;
+ char buf[60];
+ register char *p = buf;
+ int n;
+
+ sig1 = signal(SIGHUP, SIG_IGN);
+ sig2 = signal(SIGINT, SIG_IGN);
+ for (n = 0; link(sync_file, sync_lock) < 0 && n < 30; n++)
+ sleep(2);
+ (void) fseek(sync_fp, sync_seek, 0);
+ while (fscanf(sync_fp, "%d%d%d", &type, &shipnum, &isstr) != EOF) {
+ if (isstr) {
+ for (p = buf;;) {
+ switch (*p++ = getc(sync_fp)) {
+ case '\n':
+ p--;
+ case EOF:
+ break;
+ default:
+ continue;
+ }
+ break;
+ }
+ *p = 0;
+ for (p = buf; *p == ' '; p++)
+ ;
+ a = (int)p;
+ b = c = d = 0;
+ } else
+ (void) fscanf(sync_fp, "%d%d%d%d", &a, &b, &c, &d);
+ sync_update(type, SHIP(shipnum), a, b, c, d);
+ }
+ if (sync_bufp != sync_buf) {
+ (void) fseek(sync_fp, 0L, 2);
+ (void) fputs(sync_buf, sync_fp);
+ (void) fflush(sync_fp);
+ sync_bufp = sync_buf;
+ }
+ sync_seek = ftell(sync_fp);
+ (void) unlink(sync_lock);
+ (void) signal(SIGHUP, sig1);
+ (void) signal(SIGINT, sig2);
+}
+
+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->fouls[a];
+ p->turnfoul = b;
+ p->toship = SHIP(c);
+ break;
+ }
+ case W_GRAP: {
+ register struct snag *p = &ship->file->grapples[a];
+ p->turnfoul = b;
+ p->toship = SHIP(c);
+ break;
+ }
+ case W_SIGNAL:
+ (void) strncpy(ship->file->signal, (char *)a,
+ sizeof ship->file->signal - 1);
+ ship->file->signal[sizeof ship->file->signal - 1] = 0;
+ 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:
+ 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_LAST:
+ (void) strncpy(ship->file->last, (char *)a,
+ sizeof ship->file->last - 1);
+ ship->file->last[sizeof ship->file->last - 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_SHIPCOL:
+ ship->file->col = a;
+ break;
+ case W_SHIPDIR:
+ ship->file->dir = a;
+ break;
+ case W_SHIPROW:
+ 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:
+ (void) strcpy(ship->file->captain, "");
+ people--;
+ break;
+ default:
+ fprintf(stderr, "sync_update: unknown type %d\n", type);
+ break;
+ }
+}
projects / unix-history / commitdiff