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Date:: Fri Mar 18 19:34:00 2005 UTC
Message:: use nil instead of 0
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1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 #include <thread.h>
5 #include <cursor.h>
6 #include <mouse.h>
7 #include <keyboard.h>
8 #include <frame.h>
9 #include <fcall.h>
10 #include <plumb.h>
11 #include "dat.h"
12 #include "fns.h"
13 
14 static	int	sfd;
15 
16 enum
17 {
18 	Nhash	= 16,
19 	DEBUG	= 0
20 };
21 
22 static	Fid	*fids[Nhash];
23 
24 Fid	*newfid(int);
25 
26 static	Xfid*	fsysflush(Xfid*, Fid*);
27 static	Xfid*	fsysauth(Xfid*, Fid*);
28 static	Xfid*	fsysversion(Xfid*, Fid*);
29 static	Xfid*	fsysattach(Xfid*, Fid*);
30 static	Xfid*	fsyswalk(Xfid*, Fid*);
31 static	Xfid*	fsysopen(Xfid*, Fid*);
32 static	Xfid*	fsyscreate(Xfid*, Fid*);
33 static	Xfid*	fsysread(Xfid*, Fid*);
34 static	Xfid*	fsyswrite(Xfid*, Fid*);
35 static	Xfid*	fsysclunk(Xfid*, Fid*);
36 static	Xfid*	fsysremove(Xfid*, Fid*);
37 static	Xfid*	fsysstat(Xfid*, Fid*);
38 static	Xfid*	fsyswstat(Xfid*, Fid*);
39 
40 Xfid* 	(*fcall[Tmax])(Xfid*, Fid*);
41 
42 static void
43 initfcall(void)
44 {
45 	fcall[Tflush]	= fsysflush;
46 	fcall[Tversion]	= fsysversion;
47 	fcall[Tauth]	= fsysauth;
48 	fcall[Tattach]	= fsysattach;
49 	fcall[Twalk]	= fsyswalk;
50 	fcall[Topen]	= fsysopen;
51 	fcall[Tcreate]	= fsyscreate;
52 	fcall[Tread]	= fsysread;
53 	fcall[Twrite]	= fsyswrite;
54 	fcall[Tclunk]	= fsysclunk;
55 	fcall[Tremove]= fsysremove;
56 	fcall[Tstat]	= fsysstat;
57 	fcall[Twstat]	= fsyswstat;
58 }
59 
60 char Eperm[] = "permission denied";
61 char Eexist[] = "file does not exist";
62 char Enotdir[] = "not a directory";
63 
64 Dirtab dirtab[]=
65 {
66 	{ ".",			QTDIR,	Qdir,		0500|DMDIR },
67 	{ "acme",		QTDIR,	Qacme,	0500|DMDIR },
68 	{ "cons",		QTFILE,	Qcons,	0600 },
69 	{ "consctl",	QTFILE,	Qconsctl,	0000 },
70 	{ "draw",		QTDIR,	Qdraw,	0000|DMDIR },	/* to suppress graphics progs started in acme */
71 	{ "editout",	QTFILE,	Qeditout,	0200 },
72 	{ "index",		QTFILE,	Qindex,	0400 },
73 	{ "label",		QTFILE,	Qlabel,	0600 },
74 	{ "new",		QTDIR,	Qnew,	0500|DMDIR },
75 	{ nil, }
76 };
77 
78 Dirtab dirtabw[]=
79 {
80 	{ ".",			QTDIR,		Qdir,			0500|DMDIR },
81 	{ "addr",		QTFILE,		QWaddr,		0600 },
82 	{ "body",		QTAPPEND,	QWbody,		0600|DMAPPEND },
83 	{ "ctl",		QTFILE,		QWctl,		0600 },
84 	{ "data",		QTFILE,		QWdata,		0600 },
85 	{ "editout",	QTFILE,		QWeditout,	0200 },
86 	{ "errors",		QTFILE,		QWerrors,		0200 },
87 	{ "event",		QTFILE,		QWevent,		0600 },
88 	{ "rdsel",		QTFILE,		QWrdsel,		0400 },
89 	{ "wrsel",		QTFILE,		QWwrsel,		0200 },
90 	{ "tag",		QTAPPEND,	QWtag,		0600|DMAPPEND },
91 	{ "xdata",		QTFILE,		QWxdata,		0600 },
92 	{ nil, }
93 };
94 
95 typedef struct Mnt Mnt;
96 struct Mnt
97 {
98 	QLock	lk;
99 	int		id;
100 	Mntdir	*md;
101 };
102 
103 Mnt	mnt;
104 
105 Xfid*	respond(Xfid*, Fcall*, char*);
106 int		dostat(int, Dirtab*, uchar*, int, uint);
107 uint	getclock(void);
108 
109 char	*user = "Wile E. Coyote";
110 static int closing = 0;
111 int	messagesize = Maxblock+IOHDRSZ;	/* good start */
112 
113 void	fsysproc(void *);
114 
115 void
116 fsysinit(void)
117 {
118 	int p[2];
119 	char *u;
120 
121 	initfcall();
122 	if(pipe(p) < 0)
123 		error("can't create pipe");
124 	if(post9pservice(p[0], "acme") < 0)
125 		error("can't post service");
126 	sfd = p[1];
127 	fmtinstall('F', fcallfmt);
128 	if((u = getuser()) != nil)
129 		user = estrdup(u);
130 	proccreate(fsysproc, nil, STACK);
131 }
132 
133 void
134 fsysproc(void *v)
135 {
136 	int n;
137 	Xfid *x;
138 	Fid *f;
139 	Fcall t;
140 	uchar *buf;
141 
142 	USED(v);
143 	x = nil;
144 	for(;;){
145 		buf = emalloc(messagesize+UTFmax);	/* overflow for appending partial rune in xfidwrite */
146 		n = read9pmsg(sfd, buf, messagesize);
147 		if(n <= 0){
148 			if(closing)
149 				break;
150 			error("i/o error on server channel");
151 		}
152 		if(x == nil){
153 			sendp(cxfidalloc, nil);
154 			x = recvp(cxfidalloc);
155 		}
156 		x->buf = buf;
157 		if(convM2S(buf, n, &x->fcall) != n)
158 			error("convert error in convM2S");
159 		if(DEBUG)
160 			fprint(2, "%F\n", &x->fcall);
161 		if(fcall[x->fcall.type] == nil)
162 			x = respond(x, &t, "bad fcall type");
163 		else{
164 			switch(x->fcall.type){
165 			case Tversion:
166 			case Tauth:
167 			case Tflush:
168 				f = nil;
169 				break;
170 			case Tattach:
171 				f = newfid(x->fcall.fid);
172 				break;
173 			default:
174 				f = newfid(x->fcall.fid);
175 				if(!f->busy){
176 					x->f = f;
177 					x = respond(x, &t, "fid not in use");
178 					continue;
179 				}
180 				break;
181 			}
182 			x->f = f;
183 			x  = (*fcall[x->fcall.type])(x, f);
184 		}
185 	}
186 }
187 
188 Mntdir*
189 fsysaddid(Rune *dir, int ndir, Rune **incl, int nincl)
190 {
191 	Mntdir *m;
192 	int id;
193 
194 	qlock(&mnt.lk);
195 	id = ++mnt.id;
196 	m = emalloc(sizeof *m);
197 	m->id = id;
198 	m->dir =  dir;
199 	m->ref = 1;	/* one for Command, one will be incremented in attach */
200 	m->ndir = ndir;
201 	m->next = mnt.md;
202 	m->incl = incl;
203 	m->nincl = nincl;
204 	mnt.md = m;
205 	qunlock(&mnt.lk);
206 	return m;
207 }
208 
209 void
210 fsysincid(Mntdir *m)
211 {
212 	qlock(&mnt.lk);
213 	m->ref++;
214 	qunlock(&mnt.lk);
215 }
216 
217 void
218 fsysdelid(Mntdir *idm)
219 {
220 	Mntdir *m, *prev;
221 	int i;
222 	char buf[64];
223 
224 	if(idm == nil)
225 		return;
226 	qlock(&mnt.lk);
227 	if(--idm->ref > 0){
228 		qunlock(&mnt.lk);
229 		return;
230 	}
231 	prev = nil;
232 	for(m=mnt.md; m; m=m->next){
233 		if(m == idm){
234 			if(prev)
235 				prev->next = m->next;
236 			else
237 				mnt.md = m->next;
238 			for(i=0; i<m->nincl; i++)
239 				free(m->incl[i]);
240 			free(m->incl);
241 			free(m->dir);
242 			free(m);
243 			qunlock(&mnt.lk);
244 			return;
245 		}
246 		prev = m;
247 	}
248 	qunlock(&mnt.lk);
249 	sprint(buf, "fsysdelid: can't find id %d\n", idm->id);
250 	sendp(cerr, estrdup(buf));
251 }
252 
253 /*
254  * Called only in exec.c:/^run(), from a different FD group
255  */
256 Mntdir*
257 fsysmount(Rune *dir, int ndir, Rune **incl, int nincl)
258 {
259 	return fsysaddid(dir, ndir, incl, nincl);
260 }
261 
262 void
263 fsysclose(void)
264 {
265 	closing = 1;
266 	close(sfd);
267 }
268 
269 Xfid*
270 respond(Xfid *x, Fcall *t, char *err)
271 {
272 	int n;
273 
274 	if(err){
275 		t->type = Rerror;
276 		t->ename = err;
277 	}else
278 		t->type = x->fcall.type+1;
279 	t->fid = x->fcall.fid;
280 	t->tag = x->fcall.tag;
281 	if(x->buf == nil)
282 		x->buf = emalloc(messagesize);
283 	n = convS2M(t, x->buf, messagesize);
284 	if(n <= 0)
285 {
286 fprint(2, "convert error (n=%d, msgsize %d): have %F\n", n, messagesize, &x->fcall);
287 fprint(2, "\tresponse: %F\n", t);
288 		error("convert error in convS2M");
289 }
290 	if(write(sfd, x->buf, n) != n)
291 		error("write error in respond");
292 	free(x->buf);
293 	x->buf = nil;
294 	if(DEBUG)
295 		fprint(2, "r: %F\n", t);
296 	return x;
297 }
298 
299 static
300 Xfid*
301 fsysversion(Xfid *x, Fid *f)
302 {
303 	Fcall t;
304 
305 	USED(f);
306 	if(x->fcall.msize < 256)
307 		return respond(x, &t, "version: message size too small");
308 	messagesize = x->fcall.msize;
309 	t.msize = messagesize;
310 	if(strncmp(x->fcall.version, "9P2000", 6) != 0)
311 		return respond(x, &t, "unrecognized 9P version");
312 	t.version = "9P2000";
313 	return respond(x, &t, nil);
314 }
315 
316 static
317 Xfid*
318 fsysauth(Xfid *x, Fid *f)
319 {
320 	Fcall t;
321 
322 	USED(f);
323 	return respond(x, &t, "acme: authentication not required");
324 }
325 
326 static
327 Xfid*
328 fsysflush(Xfid *x, Fid *f)
329 {
330 	USED(f);
331 	sendp(x->c, (void*)xfidflush);
332 	return nil;
333 }
334 
335 static
336 Xfid*
337 fsysattach(Xfid *x, Fid *f)
338 {
339 	Fcall t;
340 	int id;
341 	Mntdir *m;
342 	char buf[128];
343 
344 	if(strcmp(x->fcall.uname, user) != 0)
345 		return respond(x, &t, Eperm);
346 	f->busy = TRUE;
347 	f->open = FALSE;
348 	f->qid.path = Qdir;
349 	f->qid.type = QTDIR;
350 	f->qid.vers = 0;
351 	f->dir = dirtab;
352 	f->nrpart = 0;
353 	f->w = nil;
354 	t.qid = f->qid;
355 	f->mntdir = nil;
356 	id = atoi(x->fcall.aname);
357 	qlock(&mnt.lk);
358 	for(m=mnt.md; m; m=m->next)
359 		if(m->id == id){
360 			f->mntdir = m;
361 			m->ref++;
362 			break;
363 		}
364 	if(m == nil && x->fcall.aname[0]){
365 		snprint(buf, sizeof buf, "unknown id '%s' in attach", x->fcall.aname);
366 		sendp(cerr, estrdup(buf));
367 	}
368 	qunlock(&mnt.lk);
369 	return respond(x, &t, nil);
370 }
371 
372 static
373 Xfid*
374 fsyswalk(Xfid *x, Fid *f)
375 {
376 	Fcall t;
377 	int c, i, j, id;
378 	Qid q;
379 	uchar type;
380 	ulong path;
381 	Fid *nf;
382 	Dirtab *d, *dir;
383 	Window *w;
384 	char *err;
385 
386 	nf = nil;
387 	w = nil;
388 	if(f->open)
389 		return respond(x, &t, "walk of open file");
390 	if(x->fcall.fid != x->fcall.newfid){
391 		nf = newfid(x->fcall.newfid);
392 		if(nf->busy)
393 			return respond(x, &t, "newfid already in use");
394 		nf->busy = TRUE;
395 		nf->open = FALSE;
396 		nf->mntdir = f->mntdir;
397 		if(f->mntdir)
398 			f->mntdir->ref++;
399 		nf->dir = f->dir;
400 		nf->qid = f->qid;
401 		nf->w = f->w;
402 		nf->nrpart = 0;	/* not open, so must be zero */
403 		if(nf->w)
404 			incref(&nf->w->ref);
405 		f = nf;	/* walk f */
406 	}
407 
408 	t.nwqid = 0;
409 	err = nil;
410 	dir = nil;
411 	id = WIN(f->qid);
412 	q = f->qid;
413 
414 	if(x->fcall.nwname > 0){
415 		for(i=0; i<x->fcall.nwname; i++){
416 			if((q.type & QTDIR) == 0){
417 				err = Enotdir;
418 				break;
419 			}
420 
421 			if(strcmp(x->fcall.wname[i], "..") == 0){
422 				type = QTDIR;
423 				path = Qdir;
424 				id = 0;
425 				if(w){
426 					winclose(w);
427 					w = nil;
428 				}
429     Accept:
430 				if(i == MAXWELEM){
431 					err = "name too long";
432 					break;
433 				}
434 				q.type = type;
435 				q.vers = 0;
436 				q.path = QID(id, path);
437 				t.wqid[t.nwqid++] = q;
438 				continue;
439 			}
440 
441 			/* is it a numeric name? */
442 			for(j=0; (c=x->fcall.wname[i][j]); j++)
443 				if(c<'0' || '9'<c)
444 					goto Regular;
445 			/* yes: it's a directory */
446 			if(w)	/* name has form 27/23; get out before losing w */
447 				break;
448 			id = atoi(x->fcall.wname[i]);
449 			qlock(&row.lk);
450 			w = lookid(id, FALSE);
451 			if(w == nil){
452 				qunlock(&row.lk);
453 				break;
454 			}
455 			incref(&w->ref);	/* we'll drop reference at end if there's an error */
456 			path = Qdir;
457 			type = QTDIR;
458 			qunlock(&row.lk);
459 			dir = dirtabw;
460 			goto Accept;
461 	
462     Regular:
463 //			if(FILE(f->qid) == Qacme)	/* empty directory */
464 //				break;
465 			if(strcmp(x->fcall.wname[i], "new") == 0){
466 				if(w)
467 					error("w set in walk to new");
468 				sendp(cnewwindow, nil);	/* signal newwindowthread */
469 				w = recvp(cnewwindow);	/* receive new window */
470 				incref(&w->ref);
471 				type = QTDIR;
472 				path = QID(w->id, Qdir);
473 				id = w->id;
474 				dir = dirtabw;
475 				goto Accept;
476 			}
477 
478 			if(id == 0)
479 				d = dirtab;
480 			else
481 				d = dirtabw;
482 			d++;	/* skip '.' */
483 			for(; d->name; d++)
484 				if(strcmp(x->fcall.wname[i], d->name) == 0){
485 					path = d->qid;
486 					type = d->type;
487 					dir = d;
488 					goto Accept;
489 				}
490 
491 			break;	/* file not found */
492 		}
493 
494 		if(i==0 && err == nil)
495 			err = Eexist;
496 	}
497 
498 	if(err!=nil || t.nwqid<x->fcall.nwname){
499 		if(nf){
500 			nf->busy = FALSE;
501 			fsysdelid(nf->mntdir);
502 		}
503 	}else if(t.nwqid  == x->fcall.nwname){
504 		if(w){
505 			f->w = w;
506 			w = nil;	/* don't drop the reference */
507 		}
508 		if(dir)
509 			f->dir = dir;
510 		f->qid = q;
511 	}
512 
513 	if(w != nil)
514 		winclose(w);
515 
516 	return respond(x, &t, err);
517 }
518 
519 static
520 Xfid*
521 fsysopen(Xfid *x, Fid *f)
522 {
523 	Fcall t;
524 	int m;
525 
526 	/* can't truncate anything, so just disregard */
527 	x->fcall.mode &= ~(OTRUNC|OCEXEC);
528 	/* can't execute or remove anything */
529 	if(x->fcall.mode==OEXEC || (x->fcall.mode&ORCLOSE))
530 		goto Deny;
531 	switch(x->fcall.mode){
532 	default:
533 		goto Deny;
534 	case OREAD:
535 		m = 0400;
536 		break;
537 	case OWRITE:
538 		m = 0200;
539 		break;
540 	case ORDWR:
541 		m = 0600;
542 		break;
543 	}
544 	if(((f->dir->perm&~(DMDIR|DMAPPEND))&m) != m)
545 		goto Deny;
546 
547 	sendp(x->c, (void*)xfidopen);
548 	return nil;
549 
550     Deny:
551 	return respond(x, &t, Eperm);
552 }
553 
554 static
555 Xfid*
556 fsyscreate(Xfid *x, Fid *f)
557 {
558 	Fcall t;
559 
560 	USED(f);
561 	return respond(x, &t, Eperm);
562 }
563 
564 static
565 int
566 idcmp(const void *a, const void *b)
567 {
568 	return *(int*)a - *(int*)b;
569 }
570 
571 static
572 Xfid*
573 fsysread(Xfid *x, Fid *f)
574 {
575 	Fcall t;
576 	uchar *b;
577 	int i, id, n, o, e, j, k, *ids, nids;
578 	Dirtab *d, dt;
579 	Column *c;
580 	uint clock, len;
581 	char buf[16];
582 
583 	if(f->qid.type & QTDIR){
584 		if(FILE(f->qid) == Qacme){	/* empty dir */
585 			t.data = nil;
586 			t.count = 0;
587 			respond(x, &t, nil);
588 			return x;
589 		}
590 		o = x->fcall.offset;
591 		e = x->fcall.offset+x->fcall.count;
592 		clock = getclock();
593 		b = emalloc(messagesize);
594 		id = WIN(f->qid);
595 		n = 0;
596 		if(id > 0)
597 			d = dirtabw;
598 		else
599 			d = dirtab;
600 		d++;	/* first entry is '.' */
601 		for(i=0; d->name!=nil && i<e; i+=len){
602 			len = dostat(WIN(x->f->qid), d, b+n, x->fcall.count-n, clock);
603 			if(len <= BIT16SZ)
604 				break;
605 			if(i >= o)
606 				n += len;
607 			d++;
608 		}
609 		if(id == 0){
610 			qlock(&row.lk);
611 			nids = 0;
612 			ids = nil;
613 			for(j=0; j<row.ncol; j++){
614 				c = row.col[j];
615 				for(k=0; k<c->nw; k++){
616 					ids = realloc(ids, (nids+1)*sizeof(int));
617 					ids[nids++] = c->w[k]->id;
618 				}
619 			}
620 			qunlock(&row.lk);
621 			qsort(ids, nids, sizeof ids[0], idcmp);
622 			j = 0;
623 			dt.name = buf;
624 			for(; j<nids && i<e; i+=len){
625 				k = ids[j];
626 				sprint(dt.name, "%d", k);
627 				dt.qid = QID(k, Qdir);
628 				dt.type = QTDIR;
629 				dt.perm = DMDIR|0700;
630 				len = dostat(k, &dt, b+n, x->fcall.count-n, clock);
631 				if(len == 0)
632 					break;
633 				if(i >= o)
634 					n += len;
635 				j++;
636 			}
637 			free(ids);
638 		}
639 		t.data = (char*)b;
640 		t.count = n;
641 		respond(x, &t, nil);
642 		free(b);
643 		return x;
644 	}
645 	sendp(x->c, (void*)xfidread);
646 	return nil;
647 }
648 
649 static
650 Xfid*
651 fsyswrite(Xfid *x, Fid *f)
652 {
653 	USED(f);
654 	sendp(x->c, (void*)xfidwrite);
655 	return nil;
656 }
657 
658 static
659 Xfid*
660 fsysclunk(Xfid *x, Fid *f)
661 {
662 	fsysdelid(f->mntdir);
663 	sendp(x->c, (void*)xfidclose);
664 	return nil;
665 }
666 
667 static
668 Xfid*
669 fsysremove(Xfid *x, Fid *f)
670 {
671 	Fcall t;
672 
673 	USED(f);
674 	return respond(x, &t, Eperm);
675 }
676 
677 static
678 Xfid*
679 fsysstat(Xfid *x, Fid *f)
680 {
681 	Fcall t;
682 
683 	t.stat = emalloc(messagesize-IOHDRSZ);
684 	t.nstat = dostat(WIN(x->f->qid), f->dir, t.stat, messagesize-IOHDRSZ, getclock());
685 	x = respond(x, &t, nil);
686 	free(t.stat);
687 	return x;
688 }
689 
690 static
691 Xfid*
692 fsyswstat(Xfid *x, Fid *f)
693 {
694 	Fcall t;
695 
696 	USED(f);
697 	return respond(x, &t, Eperm);
698 }
699 
700 Fid*
701 newfid(int fid)
702 {
703 	Fid *f, *ff, **fh;
704 
705 	ff = nil;
706 	fh = &fids[fid&(Nhash-1)];
707 	for(f=*fh; f; f=f->next)
708 		if(f->fid == fid)
709 			return f;
710 		else if(ff==nil && f->busy==FALSE)
711 			ff = f;
712 	if(ff){
713 		ff->fid = fid;
714 		return ff;
715 	}
716 	f = emalloc(sizeof *f);
717 	f->fid = fid;
718 	f->next = *fh;
719 	*fh = f;
720 	return f;
721 }
722 
723 uint
724 getclock(void)
725 {
726 /*
727 	char buf[32];
728 
729 	buf[0] = '\0';
730 	pread(clockfd, buf, sizeof buf, 0);
731 	return atoi(buf);
732 */	
733 	return time(0);
734 }
735 
736 int
737 dostat(int id, Dirtab *dir, uchar *buf, int nbuf, uint clock)
738 {
739 	Dir d;
740 
741 	d.qid.path = QID(id, dir->qid);
742 	d.qid.vers = 0;
743 	d.qid.type = dir->type;
744 	d.mode = dir->perm;
745 	d.length = 0;	/* would be nice to do better */
746 	d.name = dir->name;
747 	d.uid = user;
748 	d.gid = user;
749 	d.muid = user;
750 	d.atime = clock;
751 	d.mtime = clock;
752 	return convD2M(&d, buf, nbuf);
753 }