xref: /illumos-gate/usr/src/cmd/svc/startd/file.c (revision 2a8bcb4e)
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, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*
28  * file.c - file dependency vertex code
29  *
30  *   In principle, file dependencies should be retested on mount/unmount
31  *   events, and dependency error flow used to determine whether a lost file
32  *   affects the dependent service.  If mount/unmount events are not available,
33  *   the kstat facility (which registers or deregisters a statistic at
34  *   mount/umount) could be used as an indirect filesystem event detector.
35  *
36  *   In practice, file dependencies are checked only for existence at start
37  *   time.
38  */
39 
40 #include <sys/stat.h>
41 #include <sys/types.h>
42 #include <errno.h>
43 #include <stdio.h>
44 #include <string.h>
45 #include <strings.h>
46 
47 #include <startd.h>
48 
49 int
file_ready(graph_vertex_t * v)50 file_ready(graph_vertex_t *v)
51 {
52 	char *fn;
53 	struct stat sbuf;
54 	int r;
55 	char *file_fmri = v->gv_name;
56 
57 	/*
58 	 * Advance through file: FMRI until we have an absolute file path.
59 	 */
60 	if (strncmp(file_fmri, "file:///", sizeof ("file:///") - 1) == 0) {
61 		fn = file_fmri + sizeof ("file://") - 1;
62 	} else if (strncmp(file_fmri, "file://localhost/",
63 		sizeof ("file://localhost/") - 1) == 0) {
64 		fn = file_fmri + sizeof ("file://localhost") - 1;
65 	} else if (strncmp(file_fmri, "file://", sizeof ("file://") - 1)
66 	    == 0) {
67 		fn = file_fmri + sizeof ("file://") - 1;
68 
69 		/*
70 		 * Again, search for the next '/'.
71 		 */
72 		if ((fn = strchr(fn, '/')) == NULL)
73 			return (0);
74 	}
75 
76 	/*
77 	 * If stat(2) succeeds for that path, then the dependency is satisfied.
78 	 */
79 	do {
80 		r = stat(fn, &sbuf);
81 	} while (r == -1 && errno == EINTR);
82 
83 	return (r == -1 ? 0 : 1);
84 }
85