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1.1 root 1: /*
2: * Copyright (c) 1983 Regents of the University of California.
3: * All rights reserved. The Berkeley software License Agreement
4: * specifies the terms and conditions for redistribution.
5: */
6:
7: #ifndef lint
8: static char sccsid[] = "@(#)sync.c 5.2 (Berkeley) 1/21/86";
9: #endif not lint
10:
11: #include "externs.h"
12: #include <sys/file.h>
13: #include <sys/errno.h>
14:
15: #define BUFSIZE 4096
16:
17: static char sync_buf[BUFSIZE];
18: static char *sync_bp = sync_buf;
19: static char sync_lock[25];
20: static char sync_file[25];
21: static long sync_seek;
22: static FILE *sync_fp;
23: #define SF "/tmp/#sailsink.%d"
24: #define LF "/tmp/#saillock.%d"
25:
26: /*VARARGS3*/
27: makesignal(from, fmt, ship, a, b, c)
28: struct ship *from;
29: char *fmt;
30: register struct ship *ship;
31: {
32: char message[80];
33:
34: if (ship == 0)
35: (void) sprintf(message, fmt, a, b, c);
36: else
37: (void) sprintf(message, fmt,
38: ship->shipname, colours(ship),
39: sterncolour(ship), a, b, c);
40: Write(W_SIGNAL, from, 1, (int)message, 0, 0, 0);
41: }
42:
43: #include <sys/types.h>
44: #include <sys/stat.h>
45: sync_exists(game)
46: {
47: char buf[sizeof sync_file];
48: struct stat s;
49: time_t t;
50:
51: (void) sprintf(buf, SF, game);
52: (void) time(&t);
53: if (stat(buf, &s) < 0)
54: return 0;
55: if (s.st_mtime < t - 60*60*2) { /* 2 hours */
56: (void) unlink(buf);
57: (void) sprintf(buf, LF, game);
58: (void) unlink(buf);
59: return 0;
60: } else
61: return 1;
62: }
63:
64: sync_open()
65: {
66: if (sync_fp != NULL)
67: (void) fclose(sync_fp);
68: (void) sprintf(sync_lock, LF, game);
69: (void) sprintf(sync_file, SF, game);
70: if (access(sync_file, 0) < 0) {
71: int omask = umask(issetuid ? 077 : 011);
72: sync_fp = fopen(sync_file, "w+");
73: (void) umask(omask);
74: } else
75: sync_fp = fopen(sync_file, "r+");
76: if (sync_fp == NULL)
77: return -1;
78: sync_seek = 0;
79: return 0;
80: }
81:
82: sync_close(remove)
83: char remove;
84: {
85: if (sync_fp != 0)
86: (void) fclose(sync_fp);
87: if (remove)
88: (void) unlink(sync_file);
89: }
90:
91: Write(type, ship, isstr, a, b, c, d)
92: int type;
93: struct ship *ship;
94: char isstr;
95: int a, b, c, d;
96: {
97: if (isstr)
98: (void) sprintf(sync_bp, "%d %d %d %s\n",
99: type, ship->file->index, isstr, a);
100: else
101: (void) sprintf(sync_bp, "%d %d %d %d %d %d %d\n",
102: type, ship->file->index, isstr, a, b, c, d);
103: while (*sync_bp++)
104: ;
105: sync_bp--;
106: if (sync_bp >= &sync_buf[sizeof sync_buf])
107: abort();
108: (void) sync_update(type, ship, a, b, c, d);
109: }
110:
111: Sync()
112: {
113: int (*sighup)(), (*sigint)();
114: register n;
115: int type, shipnum, isstr, a, b, c, d;
116: char buf[80];
117: char erred = 0;
118: extern errno;
119:
120: sighup = signal(SIGHUP, SIG_IGN);
121: sigint = signal(SIGINT, SIG_IGN);
122: for (n = TIMEOUT; --n >= 0;) {
123: #ifdef LOCK_EX
124: if (flock(fileno(sync_fp), LOCK_EX|LOCK_NB) >= 0)
125: break;
126: if (errno != EWOULDBLOCK)
127: return -1;
128: #else
129: if (link(sync_file, sync_lock) >= 0)
130: break;
131: if (errno != EEXIST)
132: return -1;
133: #endif
134: sleep(1);
135: }
136: if (n <= 0)
137: return -1;
138: (void) fseek(sync_fp, sync_seek, 0);
139: for (;;) {
140: switch (fscanf(sync_fp, "%d%d%d", &type, &shipnum, &isstr)) {
141: case 3:
142: break;
143: case EOF:
144: goto out;
145: default:
146: goto bad;
147: }
148: if (shipnum < 0 || shipnum >= cc->vessels)
149: goto bad;
150: if (isstr != 0 && isstr != 1)
151: goto bad;
152: if (isstr) {
153: register char *p;
154: for (p = buf;;) {
155: switch (*p++ = getc(sync_fp)) {
156: case '\n':
157: p--;
158: case EOF:
159: break;
160: default:
161: if (p >= buf + sizeof buf)
162: p--;
163: continue;
164: }
165: break;
166: }
167: *p = 0;
168: for (p = buf; *p == ' '; p++)
169: ;
170: a = (int)p;
171: b = c = d = 0;
172: } else
173: if (fscanf(sync_fp, "%d%d%d%d", &a, &b, &c, &d) != 4)
174: goto bad;
175: if (sync_update(type, SHIP(shipnum), a, b, c, d) < 0)
176: goto bad;
177: }
178: bad:
179: erred++;
180: out:
181: if (!erred && sync_bp != sync_buf) {
182: (void) fseek(sync_fp, 0L, 2);
183: (void) fwrite(sync_buf, sizeof *sync_buf, sync_bp - sync_buf,
184: sync_fp);
185: (void) fflush(sync_fp);
186: sync_bp = sync_buf;
187: }
188: sync_seek = ftell(sync_fp);
189: #ifdef LOCK_EX
190: (void) flock(fileno(sync_fp), LOCK_UN);
191: #else
192: (void) unlink(sync_lock);
193: #endif
194: (void) signal(SIGHUP, sighup);
195: (void) signal(SIGINT, sigint);
196: return erred ? -1 : 0;
197: }
198:
199: sync_update(type, ship, a, b, c, d)
200: int type;
201: register struct ship *ship;
202: int a, b, c, d;
203: {
204: switch (type) {
205: case W_DBP: {
206: register struct BP *p = &ship->file->DBP[a];
207: p->turnsent = b;
208: p->toship = SHIP(c);
209: p->mensent = d;
210: break;
211: }
212: case W_OBP: {
213: register struct BP *p = &ship->file->OBP[a];
214: p->turnsent = b;
215: p->toship = SHIP(c);
216: p->mensent = d;
217: break;
218: }
219: case W_FOUL: {
220: register struct snag *p = &ship->file->foul[a];
221: if (SHIP(a)->file->dir == 0)
222: break;
223: if (p->sn_count++ == 0)
224: p->sn_turn = turn;
225: ship->file->nfoul++;
226: break;
227: }
228: case W_GRAP: {
229: register struct snag *p = &ship->file->grap[a];
230: if (SHIP(a)->file->dir == 0)
231: break;
232: if (p->sn_count++ == 0)
233: p->sn_turn = turn;
234: ship->file->ngrap++;
235: break;
236: }
237: case W_UNFOUL: {
238: register struct snag *p = &ship->file->foul[a];
239: if (p->sn_count > 0)
240: if (b) {
241: ship->file->nfoul -= p->sn_count;
242: p->sn_count = 0;
243: } else {
244: ship->file->nfoul--;
245: p->sn_count--;
246: }
247: break;
248: }
249: case W_UNGRAP: {
250: register struct snag *p = &ship->file->grap[a];
251: if (p->sn_count > 0)
252: if (b) {
253: ship->file->ngrap -= p->sn_count;
254: p->sn_count = 0;
255: } else {
256: ship->file->ngrap--;
257: p->sn_count--;
258: }
259: break;
260: }
261: case W_SIGNAL:
262: if (mode == MODE_PLAYER)
263: if (nobells)
264: Signal("%s (%c%c): %s", ship, a);
265: else
266: Signal("\7%s (%c%c): %s", ship, a);
267: break;
268: case W_CREW: {
269: register struct shipspecs *s = ship->specs;
270: s->crew1 = a;
271: s->crew2 = b;
272: s->crew3 = c;
273: break;
274: }
275: case W_CAPTAIN:
276: (void) strncpy(ship->file->captain, (char *)a,
277: sizeof ship->file->captain - 1);
278: ship->file->captain[sizeof ship->file->captain - 1] = 0;
279: break;
280: case W_CAPTURED:
281: if (a < 0)
282: ship->file->captured = 0;
283: else
284: ship->file->captured = SHIP(a);
285: break;
286: case W_CLASS:
287: ship->specs->class = a;
288: break;
289: case W_DRIFT:
290: ship->file->drift = a;
291: break;
292: case W_EXPLODE:
293: if ((ship->file->explode = a) == 2)
294: ship->file->dir = 0;
295: break;
296: case W_FS:
297: ship->file->FS = a;
298: break;
299: case W_GUNL: {
300: register struct shipspecs *s = ship->specs;
301: s->gunL = a;
302: s->carL = b;
303: break;
304: }
305: case W_GUNR: {
306: register struct shipspecs *s = ship->specs;
307: s->gunR = a;
308: s->carR = b;
309: break;
310: }
311: case W_HULL:
312: ship->specs->hull = a;
313: break;
314: case W_MOVE:
315: (void) strncpy(ship->file->movebuf, (char *)a,
316: sizeof ship->file->movebuf - 1);
317: ship->file->movebuf[sizeof ship->file->movebuf - 1] = 0;
318: break;
319: case W_PCREW:
320: ship->file->pcrew = a;
321: break;
322: case W_POINTS:
323: ship->file->points = a;
324: break;
325: case W_QUAL:
326: ship->specs->qual = a;
327: break;
328: case W_RIGG: {
329: register struct shipspecs *s = ship->specs;
330: s->rig1 = a;
331: s->rig2 = b;
332: s->rig3 = c;
333: s->rig4 = d;
334: break;
335: }
336: case W_RIG1:
337: ship->specs->rig1 = a;
338: break;
339: case W_RIG2:
340: ship->specs->rig2 = a;
341: break;
342: case W_RIG3:
343: ship->specs->rig3 = a;
344: break;
345: case W_RIG4:
346: ship->specs->rig4 = a;
347: break;
348: case W_COL:
349: ship->file->col = a;
350: break;
351: case W_DIR:
352: ship->file->dir = a;
353: break;
354: case W_ROW:
355: ship->file->row = a;
356: break;
357: case W_SINK:
358: if ((ship->file->sink = a) == 2)
359: ship->file->dir = 0;
360: break;
361: case W_STRUCK:
362: ship->file->struck = a;
363: break;
364: case W_TA:
365: ship->specs->ta = a;
366: break;
367: case W_ALIVE:
368: alive = 1;
369: break;
370: case W_TURN:
371: turn = a;
372: break;
373: case W_WIND:
374: winddir = a;
375: windspeed = b;
376: break;
377: case W_BEGIN:
378: (void) strcpy(ship->file->captain, "begin");
379: people++;
380: break;
381: case W_END:
382: *ship->file->captain = 0;
383: ship->file->points = 0;
384: people--;
385: break;
386: case W_DDEAD:
387: hasdriver = 0;
388: break;
389: default:
390: fprintf(stderr, "sync_update: unknown type %d\r\n", type);
391: return -1;
392: }
393: return 0;
394: }
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