xref: /onnv-gate/usr/src/uts/common/syscall/resolvepath.c (revision 0:68f95e015346)
1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate  * CDDL HEADER START
3*0Sstevel@tonic-gate  *
4*0Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*0Sstevel@tonic-gate  * with the License.
8*0Sstevel@tonic-gate  *
9*0Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate  * and limitations under the License.
13*0Sstevel@tonic-gate  *
14*0Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate  *
20*0Sstevel@tonic-gate  * CDDL HEADER END
21*0Sstevel@tonic-gate  */
22*0Sstevel@tonic-gate #ident	"%Z%%M%	%I%	%E% SMI"
23*0Sstevel@tonic-gate 
24*0Sstevel@tonic-gate /*
25*0Sstevel@tonic-gate  * Copyright 1997 by Sun Microsystems, Inc.
26*0Sstevel@tonic-gate  * All rights reserved.
27*0Sstevel@tonic-gate  */
28*0Sstevel@tonic-gate 
29*0Sstevel@tonic-gate #include <sys/param.h>
30*0Sstevel@tonic-gate #include <sys/types.h>
31*0Sstevel@tonic-gate #include <sys/systm.h>
32*0Sstevel@tonic-gate #include <sys/errno.h>
33*0Sstevel@tonic-gate #include <sys/pathname.h>
34*0Sstevel@tonic-gate 
35*0Sstevel@tonic-gate int
resolvepath(char * path,char * buf,size_t count)36*0Sstevel@tonic-gate resolvepath(char *path, char *buf, size_t count)
37*0Sstevel@tonic-gate {
38*0Sstevel@tonic-gate 	struct pathname lookpn;
39*0Sstevel@tonic-gate 	struct pathname resolvepn;
40*0Sstevel@tonic-gate 	int error;
41*0Sstevel@tonic-gate 
42*0Sstevel@tonic-gate 	if (count == 0)
43*0Sstevel@tonic-gate 		return (0);
44*0Sstevel@tonic-gate 	if (error = pn_get(path, UIO_USERSPACE, &lookpn))
45*0Sstevel@tonic-gate 		return (set_errno(error));
46*0Sstevel@tonic-gate 	pn_alloc(&resolvepn);
47*0Sstevel@tonic-gate 	error = lookuppn(&lookpn, &resolvepn, FOLLOW, NULL, NULL);
48*0Sstevel@tonic-gate 	if (error == 0) {
49*0Sstevel@tonic-gate 		if (count > resolvepn.pn_pathlen)
50*0Sstevel@tonic-gate 			count = resolvepn.pn_pathlen;
51*0Sstevel@tonic-gate 		if (copyout(resolvepn.pn_path, buf, count))
52*0Sstevel@tonic-gate 			error = EFAULT;
53*0Sstevel@tonic-gate 	}
54*0Sstevel@tonic-gate 	pn_free(&resolvepn);
55*0Sstevel@tonic-gate 	pn_free(&lookpn);
56*0Sstevel@tonic-gate 
57*0Sstevel@tonic-gate 	if (error)
58*0Sstevel@tonic-gate 		return (set_errno(error));
59*0Sstevel@tonic-gate 	return ((int)count);
60*0Sstevel@tonic-gate }
61