gdb - Local mods (compile)
[dragonfly.git] / lib / libdevattr / devattr_enumerate.c
1 /*
2  * Copyright (c) 2010 The DragonFly Project.  All rights reserved.
3  *
4  * This code is derived from software contributed to The DragonFly Project
5  * by Alex Hornung <ahornung@gmail.com>
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  *
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in
15  *    the documentation and/or other materials provided with the
16  *    distribution.
17  * 3. Neither the name of The DragonFly Project nor the names of its
18  *    contributors may be used to endorse or promote products derived
19  *    from this software without specific, prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  */
34 #include <sys/types.h>
35 #include <sys/device.h>
36 #include <sys/wait.h>
37 #include <sys/socket.h>
38 #include <sys/ioctl.h>
39 #include <sys/poll.h>
40 #include <sys/queue.h>
41 #include <sys/un.h>
42 #include <cpu/inttypes.h>
43
44 #include <err.h>
45 #include <errno.h>
46 #include <fcntl.h>
47 #include <libgen.h>
48 #include <regex.h>
49 #include <signal.h>
50 #include <stdarg.h>
51 #include <stdio.h>
52 #include <stdlib.h>
53 #include <string.h>
54 #include <syslog.h>
55 #include <unistd.h>
56 #include <pthread.h>
57
58 #include <libprop/proplib.h>
59 #include <sys/udev.h>
60 #define LIBDEVATTR_INTERNAL
61 #include "devattr.h"
62
63 struct udev_enumerate {
64         struct udev     *udev_ctx;
65         prop_array_t    ev_filt;
66         prop_array_t    pa;
67         int     refs;
68         TAILQ_HEAD(, udev_list_entry)   list_entries;
69 };
70
71 struct udev_list_entry {
72         struct udev     *udev_ctx;
73         prop_dictionary_t       dict;
74         TAILQ_ENTRY(udev_list_entry)    link;
75 };
76
77 struct udev_enumerate *
78 udev_enumerate_new(struct udev *udev_ctx)
79 {
80         struct udev_enumerate *udev_enum;
81
82         udev_enum = malloc(sizeof(struct udev_enumerate));
83
84         udev_enum->refs = 1;
85         udev_enum->ev_filt = NULL;
86         udev_enum->pa = NULL;
87         TAILQ_INIT(&udev_enum->list_entries);
88         udev_enum->udev_ctx = udev_ref(udev_ctx);
89
90         return udev_enum;
91 }
92
93 struct udev_enumerate *
94 udev_enumerate_ref(struct udev_enumerate *udev_enum)
95 {
96         atomic_add_int(&udev_enum->refs, 1);
97
98         return udev_enum;
99 }
100
101 void
102 udev_enumerate_unref(struct udev_enumerate *udev_enum)
103 {
104         struct udev_list_entry  *le;
105         int refcount;
106
107         refcount = atomic_fetchadd_int(&udev_enum->refs, -1);
108
109         if (refcount == 1) {
110                 atomic_subtract_int(&udev_enum->refs, 0x400); /* in destruction */
111                 if (udev_enum->pa != NULL)
112                         prop_object_release(udev_enum->pa);
113                 if (udev_enum->ev_filt != NULL)
114                         prop_object_release(udev_enum->ev_filt);
115
116                 while (!TAILQ_EMPTY(&udev_enum->list_entries)) {
117                         le = TAILQ_FIRST(&udev_enum->list_entries);
118                         TAILQ_REMOVE(&udev_enum->list_entries, le, link);
119                         prop_object_release(le->dict);
120                         free(le);
121                 }
122                 udev_unref(udev_enum->udev_ctx);
123                 free(udev_enum);
124         }
125 }
126
127 struct udev *
128 udev_enumerate_get_udev(struct udev_enumerate *udev_enum)
129 {
130         return udev_enum->udev_ctx;
131 }
132
133 int
134 udev_enumerate_scan_devices(struct udev_enumerate *udev_enum)
135 {
136         prop_array_t    pa;
137
138         if (udev_get_fd(udev_enum->udev_ctx) == -1)
139                 return -1;
140
141         pa = udevd_request_devs(udev_get_fd(udev_enum->udev_ctx), udev_enum->ev_filt);
142         if (pa == NULL)
143                 return -1;
144
145         prop_object_retain(pa);
146
147         if (udev_enum->pa != NULL)
148                 prop_object_release(udev_enum->pa);
149
150         udev_enum->pa = pa;
151
152         return 0;
153 }
154
155 struct udev_list_entry *
156 udev_enumerate_get_list_entry(struct udev_enumerate *udev_enum)
157 {
158         struct udev_list_entry *le;
159         prop_object_iterator_t  iter;
160         prop_dictionary_t       dict;
161
162         /* If the list is not empty, assume it was populated in an earlier call */
163         if (!TAILQ_EMPTY(&udev_enum->list_entries))
164                 return TAILQ_FIRST(&udev_enum->list_entries);
165
166         iter = prop_array_iterator(udev_enum->pa);
167         if (iter == NULL)
168                 return NULL;
169
170         while ((dict = prop_object_iterator_next(iter)) != NULL) {
171                 le = malloc(sizeof(struct udev_list_entry));
172                 if (le == NULL)
173                         goto out;
174
175                 prop_object_retain(dict);
176                 le->dict = dict;
177                 le->udev_ctx = udev_enum->udev_ctx;
178                 TAILQ_INSERT_TAIL(&udev_enum->list_entries, le, link);
179         }
180
181         le = TAILQ_FIRST(&udev_enum->list_entries);
182
183 out:
184         prop_object_iterator_release(iter);
185         return le;
186 }
187
188 prop_array_t
189 udev_enumerate_get_array(struct udev_enumerate *udev_enum)
190 {
191         return udev_enum->pa;
192 }
193
194 struct udev_list_entry *
195 udev_list_entry_get_next(struct udev_list_entry *list_entry)
196 {
197         return TAILQ_NEXT(list_entry, link);
198 }
199
200 prop_dictionary_t
201 udev_list_entry_get_dictionary(struct udev_list_entry *list_entry)
202 {
203         return list_entry->dict;
204 }
205
206 struct udev_device *
207 udev_list_entry_get_device(struct udev_list_entry *list_entry)
208 {
209         struct udev_device *udev_dev;
210
211         udev_dev = udev_device_new_from_dictionary(list_entry->udev_ctx,
212                                                    list_entry->dict);
213
214         return udev_dev;
215 }
216
217 int
218 udev_enumerate_add_match_subsystem(struct udev_enumerate *udev_enum,
219                                                 const char *subsystem)
220 {
221         int ret;
222
223         ret = _udev_enumerate_filter_add_match_gen(udev_enum,
224                                                  EVENT_FILTER_TYPE_WILDCARD,
225                                                  0,
226                                                  "subsystem",
227                                                  __DECONST(char *, subsystem));
228
229         return ret;
230 }
231
232 int
233 udev_enumerate_add_nomatch_subsystem(struct udev_enumerate *udev_enum,
234                                                 const char *subsystem)
235 {
236         int ret;
237
238         ret = _udev_enumerate_filter_add_match_gen(udev_enum,
239                                                  EVENT_FILTER_TYPE_WILDCARD,
240                                                  1,
241                                                  "subsystem",
242                                                  __DECONST(char *, subsystem));
243
244         return ret;
245 }
246
247 int
248 udev_enumerate_add_match_expr(struct udev_enumerate *udev_enum,
249                               const char *key,
250                               char *expr)
251 {
252         int ret;
253
254         ret = _udev_enumerate_filter_add_match_gen(udev_enum,
255                                                  EVENT_FILTER_TYPE_WILDCARD,
256                                                  0,
257                                                  key,
258                                                  expr);
259
260         return ret;
261 }
262
263 int
264 udev_enumerate_add_nomatch_expr(struct udev_enumerate *udev_enum,
265                                 const char *key,
266                                 char *expr)
267 {
268         int ret;
269
270         ret = _udev_enumerate_filter_add_match_gen(udev_enum,
271                                                  EVENT_FILTER_TYPE_WILDCARD,
272                                                  1,
273                                                  key,
274                                                  expr);
275
276         return ret;
277 }
278
279 int
280 udev_enumerate_add_match_regex(struct udev_enumerate *udev_enum,
281                               const char *key,
282                               char *expr)
283 {
284         int ret;
285
286         ret = _udev_enumerate_filter_add_match_gen(udev_enum,
287                                                  EVENT_FILTER_TYPE_REGEX,
288                                                  0,
289                                                  key,
290                                                  expr);
291
292         return ret;
293 }
294
295 int
296 udev_enumerate_add_nomatch_regex(struct udev_enumerate *udev_enum,
297                                 const char *key,
298                                 char *expr)
299 {
300         int ret;
301
302         ret = _udev_enumerate_filter_add_match_gen(udev_enum,
303                                                  EVENT_FILTER_TYPE_REGEX,
304                                                  1,
305                                                  key,
306                                                  expr);
307
308         return ret;
309 }
310
311 int
312 _udev_enumerate_filter_add_match_gen(struct udev_enumerate *udev_enum,
313                                      int type,
314                                      int neg,
315                                      const char *key,
316                                      char *expr)
317 {
318         prop_array_t            pa;
319         int error;
320
321         if (udev_enum->ev_filt == NULL) {
322                 pa = prop_array_create_with_capacity(5);
323                 if (pa == NULL)
324                         return -1;
325
326                 udev_enum->ev_filt = pa;
327         }
328
329         error = _udev_filter_add_match_gen(udev_enum->ev_filt, type, neg, key, expr);
330
331         return error;
332 }