1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #pragma ident "%Z%%M% %I% %E% SMI"
27
28 #include <string.h>
29 #include <limits.h>
30 #include <sys/types.h>
31 #include <sys/stat.h>
32 #include "Pcontrol.h"
33
34 /*
35 * Return TRUE iff dir is the /proc directory.
36 */
37 int
Pisprocdir(struct ps_prochandle * Pr,const char * dir)38 Pisprocdir(struct ps_prochandle *Pr, const char *dir)
39 {
40 char path[PATH_MAX];
41 struct stat statb;
42 struct statvfs statvfsb;
43
44 if (*dir == '/')
45 (void) snprintf(path, sizeof (path), "%s/%d/root%s",
46 procfs_path, (int)Pr->pid, dir);
47 else
48 (void) snprintf(path, sizeof (path), "%s/%d/cwd/%s",
49 procfs_path, (int)Pr->pid, dir);
50
51 /*
52 * We can't compare the statb.st_fstype string to "proc" because
53 * a loop-back mount of /proc would show "lofs" instead of "proc".
54 * Instead we use the statvfs() f_basetype string.
55 */
56 return (stat(path, &statb) == 0 &&
57 statvfs(path, &statvfsb) == 0 &&
58 (statb.st_mode & S_IFMT) == S_IFDIR &&
59 statb.st_ino == 2 &&
60 strcmp(statvfsb.f_basetype, "proc") == 0);
61 }
62