xref: /illumos-gate/usr/src/lib/libproc/common/Pisprocdir.c (revision eb00b1c8a31c2253a353644606388dff5b0e0275)
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
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