C++ (Cpp) QID9P1 Examples

Example #1

File: sub.c Project: carriercomm/plan9-gpl

void
rootream(Device dev, long addr)
{
	Iobuf *p;
	Dentry *d;

	p = getbuf(dev, addr, Bmod|Bimm);
	memset(p->iobuf, 0, RBUFSIZE);
	settag(p, Tdir, QPROOT);
	d = getdir(p, 0);
	strcpy(d->name, "/");
	d->uid = -1;
	d->gid = -1;
	d->mode = DALLOC | DDIR |
		((DREAD|DWRITE|DEXEC) << 6) |
		((DREAD|DWRITE|DEXEC) << 3) |
		((DREAD|DWRITE|DEXEC) << 0);
	d->qid = QID9P1(QPROOT|QPDIR,0);
	d->atime = time(0);
	d->mtime = d->atime;
	putbuf(p);
}

Example #2

File: 9p1.c Project: dancrossnyc/harvey

void
f_attach(Chan *cp, Oldfcall *in, Oldfcall *ou)
{
	Iobuf *p;
	Dentry *d;
	File *f;
	int u;
	Filsys *fs;
	int32_t raddr;

	if(CHAT(cp)) {
		print("c_attach %d\n", cp->chan);
		print("	fid = %d\n", in->fid);
		print("	uid = %s\n", in->uname);
		print("	arg = %s\n", in->aname);
	}

	ou->qid = QID9P1(0,0);
	ou->fid = in->fid;
	if(!in->aname[0])	/* default */
		strncpy(in->aname, filesys[0].name, sizeof(in->aname));
	p = 0;
	f = filep(cp, in->fid, 1);
	if(!f) {
		ou->err = Efid;
		goto out;
	}
	u = -1;
	if(cp != cons.chan){
		if(authorize(cp, in, ou) == 0 || strcmp(in->uname, "adm") == 0){
			ou->err = Eauth;
			goto out;
		}
		u = strtouid(in->uname);
		if(u < 0){
			ou->err = Ebadu;
			goto out;
		}
	}

	fs = fsstr(in->aname);
	if(fs == 0) {
		ou->err = Ebadspc;
		goto out;
	}
	raddr = getraddr(fs->dev);
	p = getbuf(fs->dev, raddr, Bread);
	d = getdir(p, 0);
	if(!d || checktag(p, Tdir, QPROOT) || !(d->mode & DALLOC)) {
		ou->err = Ealloc;
		goto out;
	}
	f->uid = u;
	if(iaccess(f, d, DREAD)) {
		ou->err = Eaccess;
		goto out;
	}
	accessdir(p, d, FREAD);
	mkqid(&f->qid, d, 1);
	f->fs = fs;
	f->addr = raddr;
	f->slot = 0;
	f->open = 0;
	freewp(f->wpath);
	f->wpath = 0;

	mkqid9p1(&ou->qid, &f->qid);

out:
	if(p)
		putbuf(p);
	if(f) {
		qunlock(f);
		if(ou->err)
			freefp(f);
	}
}

Example #3

File: 9p1.c Project: dancrossnyc/harvey

void
f_walk(Chan *cp, Oldfcall *in, Oldfcall *ou)
{
	Iobuf *p, *p1;
	Dentry *d, *d1;
	File *f;
	Wpath *w, *ow;
	int slot;
	int32_t addr;

	if(CHAT(cp)) {
		print("c_walk %d\n", cp->chan);
		print("	fid = %d\n", in->fid);
		print("	name = %s\n", in->name);
	}

	ou->fid = in->fid;
	ou->qid = QID9P1(0,0);
	p = 0;
	f = filep(cp, in->fid, 0);
	if(!f) {
		ou->err = Efid;
		goto out;
	}
	p = getbuf(f->fs->dev, f->addr, Bread);
	d = getdir(p, f->slot);
	if(!d || checktag(p, Tdir, QPNONE) || !(d->mode & DALLOC)) {
		ou->err = Ealloc;
		goto out;
	}
	if(!(d->mode & DDIR)) {
		ou->err = Edir1;
		goto out;
	}
	if(ou->err = mkqidcmp(&f->qid, d))
		goto out;
	if(cp != cons.chan && iaccess(f, d, DEXEC)) {
		ou->err = Eaccess;
		goto out;
	}
	accessdir(p, d, FREAD);
	if(strcmp(in->name, ".") == 0)
		goto setdot;
	if(strcmp(in->name, "..") == 0) {
		if(f->wpath == 0)
			goto setdot;
		putbuf(p);
		p = 0;
		addr = f->wpath->addr;
		slot = f->wpath->slot;
		p1 = getbuf(f->fs->dev, addr, Bread);
		d1 = getdir(p1, slot);
		if(!d1 || checktag(p1, Tdir, QPNONE) || !(d1->mode & DALLOC)) {
			if(p1)
				putbuf(p1);
			ou->err = Ephase;
			goto out;
		}
		ow = f->wpath;
		f->wpath = ow->up;
		putwp(ow);
		goto found;
	}
	for(addr=0;; addr++) {
		p1 = dnodebuf(p, d, addr, 0);
		if(!p1 || checktag(p1, Tdir, d->qid.path) ) {
			if(p1)
				putbuf(p1);
			ou->err = Eentry;
			goto out;
		}
		for(slot=0; slot<DIRPERBUF; slot++) {
			d1 = getdir(p1, slot);
			if(!(d1->mode & DALLOC))
				continue;
			if(strncmp(in->name, d1->name, sizeof(in->name)))
				continue;
			/*
			 * update walk path
			 */
			w = newwp();
			if(!w) {
				ou->err = Ewalk;
				putbuf(p1);
				goto out;
			}
			w->addr = f->addr;
			w->slot = f->slot;
			w->up = f->wpath;
			f->wpath = w;
			slot += DIRPERBUF*addr;
			goto found;
		}
		putbuf(p1);
	}

found:
	f->addr = p1->addr;
	mkqid(&f->qid, d1, 1);
	putbuf(p1);
	f->slot = slot;

setdot:
	mkqid9p1(&ou->qid, &f->qid);
	f->open = 0;

out:
	if(p)
		putbuf(p);
	if(f)
		qunlock(f);
}