xref: /illumos-gate/usr/src/lib/libdevinfo/devinfo_finddev.c (revision facf4a8d7b59fde89a8662b4f4c73a758e6c402c)
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 <stdio.h>
29 #include <unistd.h>
30 #include <fcntl.h>
31 #include <string.h>
32 #include <thread.h>
33 #include <synch.h>
34 #include <limits.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <strings.h>
38 #include <dirent.h>
39 #include <regex.h>
40 #include <errno.h>
41 #include <stdarg.h>
42 #include <libdevinfo.h>
43 #include <sys/modctl.h>
44 #include <syslog.h>
45 
46 #include <assert.h>
47 
48 
49 struct finddevhdl {
50 	int	npaths;
51 	int	curpath;
52 	char	**paths;
53 };
54 
55 
56 int
57 device_exists(const char *devname)
58 {
59 	int	rv;
60 
61 	rv = modctl(MODDEVEXISTS, devname, strlen(devname));
62 	return ((rv == 0) ? 1 : 0);
63 }
64 
65 int
66 finddev_readdir(const char *dir, finddevhdl_t *handlep)
67 {
68 	struct finddevhdl	*handle;
69 	int			n;
70 	int			rv;
71 	int64_t			bufsiz;
72 	char			*pathlist;
73 	char			*p;
74 	int			len;
75 
76 	*handlep = NULL;
77 	handle = calloc(1, sizeof (struct finddevhdl));
78 	if (handle == NULL)
79 		return (ENOMEM);
80 
81 	handle->npaths = 0;
82 	handle->curpath = 0;
83 	handle->paths = NULL;
84 
85 	rv = modctl(MODDEVREADDIR, dir, strlen(dir), NULL, &bufsiz);
86 	if (rv != 0) {
87 		free(handle);
88 		return (rv);
89 	}
90 
91 	for (;;) {
92 		assert(bufsiz != 0);
93 		if ((pathlist = malloc(bufsiz)) == NULL) {
94 			free(handle);
95 			return (ENOMEM);
96 		}
97 
98 		rv = modctl(MODDEVREADDIR, dir, strlen(dir),
99 		    pathlist, &bufsiz);
100 		if (rv == 0) {
101 			for (n = 0, p = pathlist;
102 			    (len = strlen(p)) > 0; p += len+1) {
103 				n++;
104 			}
105 			handle->npaths = n;
106 			handle->paths = calloc(n, sizeof (char *));
107 			if (handle->paths == NULL) {
108 				free(handle);
109 				free(pathlist);
110 				return (ENOMEM);
111 			}
112 			for (n = 0, p = pathlist;
113 			    (len = strlen(p)) > 0; p += len+1, n++) {
114 				handle->paths[n] = strdup(p);
115 				if (handle->paths[n] == NULL) {
116 					finddev_close((finddevhdl_t)handle);
117 					free(pathlist);
118 					return (ENOMEM);
119 				}
120 			}
121 			*handlep = (finddevhdl_t)handle;
122 			free(pathlist);
123 			return (0);
124 		}
125 		free(pathlist);
126 		switch (errno) {
127 		case EAGAIN:
128 			break;
129 		case ENOENT:
130 		default:
131 			free(handle);
132 			return (errno);
133 		}
134 	}
135 	/*NOTREACHED*/
136 }
137 
138 void
139 finddev_close(finddevhdl_t arg)
140 {
141 	struct finddevhdl *handle = (struct finddevhdl *)arg;
142 	int i;
143 
144 	for (i = 0; i < handle->npaths; i++) {
145 		if (handle->paths[i])
146 			free(handle->paths[i]);
147 	}
148 	free(handle->paths);
149 	free(handle);
150 }
151 
152 const char *
153 finddev_next(finddevhdl_t arg)
154 {
155 	struct finddevhdl *handle = (struct finddevhdl *)arg;
156 	const char *path = NULL;
157 
158 	if (handle->curpath < handle->npaths) {
159 		path = handle->paths[handle->curpath];
160 		handle->curpath++;
161 	}
162 	return (path);
163 }
164