1998/0829/port/sysfile.c (diff list | history)

1998/0512/sys/src/9/port/sysfile.c:279,306 – 1998/0829/sys/src/9/port/sysfile.c:279,304 (short | long | prev | next)
1990/0227		long unionread(Chan *c, void *va, long n) {
1998/0829		int i;
1990/0227		long nr;
1992/0720		Chan *nc; Pgrp *pg;
1998/0829		Mhead *m; Mount *mount;
1990/0227
1993/0501		pg = up->pgrp;
1993/0318		rlock(&pg->ns);
1998/0829		m = c->mh; rlock(&m->lock); mount = m->mount; for(i = 0; mount != nil && i < c->uri; i++) mount = mount->next;
1991/1011		for(;;) { if(waserror()) {
1993/0318		runlock(&pg->ns);
1998/0829		runlock(&m->lock);
1991/1011		nexterror(); }
1997/0327		nc = cclone(c->mnt->to, 0);
1998/0829		nc = cclone(mount->to, 0);
1991/1011		poperror();
1992/0720		if(c->mountid != c->mnt->mountid) {
1993/0318		pprint("unionread: changed underfoot?\n"); runlock(&pg->ns);
1997/0327		cclose(nc);
1991/1011		return 0; }
1993/0318		/* Error causes component of union to be skipped */
1998/0512		if(waserror()) {
1997/0327		cclose(nc);
1998/0512/sys/src/9/port/sysfile.c:316,333 – 1998/0829/sys/src/9/port/sysfile.c:314,331
1991/1011
1997/0327		cclose(nc);
1991/1011		if(nr > 0) {
1993/0318		runlock(&pg->ns);
1998/0829		runlock(&m->lock);
1991/1011		return nr; }
1992/0720		/* Advance to next element */ next:
1993/0318		c->mnt = c->mnt->next;
1991/1011		if(c->mnt == 0)
1998/0829		c->uri++; mount = mount->next; if(mount == nil)
1991/1011		break; c->mountid = c->mnt->mountid; c->offset = 0;
1990/0227		}
1993/0318		runlock(&pg->ns);
1998/0829		runlock(&m->lock);
1991/1011		return 0;
1990/0227		}
1998/0512/sys/src/9/port/sysfile.c:354,360 – 1998/0829/sys/src/9/port/sysfile.c:352,358
1994/0405		error(Etoosmall); } if(dir && c->mnt)
1998/0829		if(dir && c->mh)
1994/0405		n = unionread(c, (void*)arg[1], n);
1997/0408		else if(devtab[c->type]->dc != L'M')
1997/0327		n = devtab[c->type]->read(c, (void*)arg[1], n, c->offset);
1998/0512/sys/src/9/port/sysfile.c:394,400 – 1998/0829/sys/src/9/port/sysfile.c:392,398
1992/0114		error(Etoosmall);
1990/0227		}
1992/0825		if(dir && c->mnt)
1998/0829		if(dir && c->mh)
1990/0227		n = unionread(c, (void*)arg[1], n); else
1997/0327		n = devtab[c->type]->read(c, (void*)arg[1], n, c->offset);
1998/0512/sys/src/9/port/sysfile.c:514,519 – 1998/0829/sys/src/9/port/sysfile.c:512,518
1990/0227		break; }
1998/0326		*(vlong*)arg[0] = off;
1998/0829		c->uri = 0;
1998/0403		cclose(c); poperror();
1998/0319		}