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 #include "devattr.h"
  61
  62 struct udev_enumerate {
  63         struct udev     *udev_ctx;
  64         prop_array_t    ev_filt;
  65         prop_array_t    pa;
  66         int     refs;
  67         TAILQ_HEAD(, udev_list_entry)   list_entries;
  68 };
  69
  70 struct udev_list_entry {
  71         struct udev     *udev_ctx;
  72         prop_dictionary_t       dict;
  73         TAILQ_ENTRY(udev_list_entry)    link;
  74 };
  75
  76 struct udev_enumerate *
  77 udev_enumerate_new(struct udev *udev_ctx)
  78 {
  79         struct udev_enumerate *udev_enum;
  80
  81         udev_enum = malloc(sizeof(struct udev_enumerate));
  82
  83         udev_enum->refs = 1;
  84         udev_enum->ev_filt = NULL;
  85         udev_enum->pa = NULL;
  86         TAILQ_INIT(&udev_enum->list_entries);
  87         udev_enum->udev_ctx = udev_ref(udev_ctx);
  88
  89         return udev_enum;
  90 }
  91
  92 struct udev_enumerate *
  93 udev_enumerate_ref(struct udev_enumerate *udev_enum)
  94 {
  95         atomic_add_int(&udev_enum->refs, 1);
  96
  97         return udev_enum;
  98 }
  99
 100 void
 101 udev_enumerate_unref(struct udev_enumerate *udev_enum)
 102 {
 103         struct udev_list_entry  *le;
 104         int refcount;
 105
 106         refcount = atomic_fetchadd_int(&udev_enum->refs, -1);
 107
 108         if (refcount == 1) {
 109                 atomic_subtract_int(&udev_enum->refs, 0x400); /* in destruction */
 110                 if (udev_enum->pa != NULL)
 111                         prop_object_release(udev_enum->pa);
 112                 if (udev_enum->ev_filt != NULL)
 113                         prop_object_release(udev_enum->ev_filt);
 114
 115                 while (!TAILQ_EMPTY(&udev_enum->list_entries)) {
 116                         le = TAILQ_FIRST(&udev_enum->list_entries);
 117                         TAILQ_REMOVE(&udev_enum->list_entries, le, link);
 118                         prop_object_release(le->dict);
 119                         free(le);
 120                 }
 121                 udev_unref(udev_enum->udev_ctx);
 122                 free(udev_enum);
 123         }
 124 }
 125
 126 struct udev *
 127 udev_enumerate_get_udev(struct udev_enumerate *udev_enum)
 128 {
 129         return udev_enum->udev_ctx;
 130 }
 131
 132 int
 133 udev_enumerate_scan_devices(struct udev_enumerate *udev_enum)
 134 {
 135         prop_array_t    pa;
 136
 137         if (udev_get_fd(udev_enum->udev_ctx) == -1)
 138                 return -1;
 139
 140         pa = udevd_request_devs(udev_get_fd(udev_enum->udev_ctx), udev_enum->ev_filt);
 141         if (pa == NULL)
 142                 return -1;
 143
 144         prop_object_retain(pa);
 145
 146         if (udev_enum->pa != NULL)
 147                 prop_object_release(udev_enum->pa);
 148
 149         udev_enum->pa = pa;
 150
 151         return 0;
 152 }
 153
 154 struct udev_list_entry *
 155 udev_enumerate_get_list_entry(struct udev_enumerate *udev_enum)
 156 {
 157         struct udev_list_entry *le;
 158         prop_object_iterator_t  iter;
 159         prop_dictionary_t       dict;
 160
 161         /* If the list is not empty, assume it was populated in an earlier call */
 162         if (!TAILQ_EMPTY(&udev_enum->list_entries))
 163                 return TAILQ_FIRST(&udev_enum->list_entries);
 164
 165         iter = prop_array_iterator(udev_enum->pa);
 166         if (iter == NULL)
 167                 return NULL;
 168
 169         while ((dict = prop_object_iterator_next(iter)) != NULL) {
 170                 le = malloc(sizeof(struct udev_list_entry));
 171                 if (le == NULL)
 172                         goto out;
 173
 174                 prop_object_retain(dict);
 175                 le->dict = dict;
 176                 le->udev_ctx = udev_enum->udev_ctx;
 177                 TAILQ_INSERT_TAIL(&udev_enum->list_entries, le, link);
 178         }
 179
 180         le = TAILQ_FIRST(&udev_enum->list_entries);
 181
 182 out:
 183         prop_object_iterator_release(iter);
 184         return le;
 185 }
 186
 187 prop_array_t
 188 udev_enumerate_get_array(struct udev_enumerate *udev_enum)
 189 {
 190         return udev_enum->pa;
 191 }
 192
 193 struct udev_list_entry *
 194 udev_list_entry_get_next(struct udev_list_entry *list_entry)
 195 {
 196         return TAILQ_NEXT(list_entry, link);
 197 }
 198
 199 prop_dictionary_t
 200 udev_list_entry_get_dictionary(struct udev_list_entry *list_entry)
 201 {
 202         return list_entry->dict;
 203 }
 204
 205 struct udev_device *
 206 udev_list_entry_get_device(struct udev_list_entry *list_entry)
 207 {
 208         struct udev_device *udev_dev;
 209
 210         udev_dev = udev_device_new_from_dictionary(list_entry->udev_ctx,
 211                                                    list_entry->dict);
 212
 213         return udev_dev;
 214 }
 215
 216 int
 217 udev_enumerate_add_match_subsystem(struct udev_enumerate *udev_enum,
 218                                                 const char *subsystem)
 219 {
 220         int ret;
 221
 222         ret = _udev_enumerate_filter_add_match_gen(udev_enum,
 223                                                  EVENT_FILTER_TYPE_WILDCARD,
 224                                                  0,
 225                                                  "subsystem",
 226                                                  __DECONST(char *, subsystem));
 227
 228         return ret;
 229 }
 230
 231 int
 232 udev_enumerate_add_nomatch_subsystem(struct udev_enumerate *udev_enum,
 233                                                 const char *subsystem)
 234 {
 235         int ret;
 236
 237         ret = _udev_enumerate_filter_add_match_gen(udev_enum,
 238                                                  EVENT_FILTER_TYPE_WILDCARD,
 239                                                  1,
 240                                                  "subsystem",
 241                                                  __DECONST(char *, subsystem));
 242
 243         return ret;
 244 }
 245
 246 int
 247 udev_enumerate_add_match_expr(struct udev_enumerate *udev_enum,
 248                               const char *key,
 249                               char *expr)
 250 {
 251         int ret;
 252
 253         ret = _udev_enumerate_filter_add_match_gen(udev_enum,
 254                                                  EVENT_FILTER_TYPE_WILDCARD,
 255                                                  0,
 256                                                  key,
 257                                                  expr);
 258
 259         return ret;
 260 }
 261
 262 int
 263 udev_enumerate_add_nomatch_expr(struct udev_enumerate *udev_enum,
 264                                 const char *key,
 265                                 char *expr)
 266 {
 267         int ret;
 268
 269         ret = _udev_enumerate_filter_add_match_gen(udev_enum,
 270                                                  EVENT_FILTER_TYPE_WILDCARD,
 271                                                  1,
 272                                                  key,
 273                                                  expr);
 274
 275         return ret;
 276 }
 277
 278 int
 279 udev_enumerate_add_match_regex(struct udev_enumerate *udev_enum,
 280                               const char *key,
 281                               char *expr)
 282 {
 283         int ret;
 284
 285         ret = _udev_enumerate_filter_add_match_gen(udev_enum,
 286                                                  EVENT_FILTER_TYPE_REGEX,
 287                                                  0,
 288                                                  key,
 289                                                  expr);
 290
 291         return ret;
 292 }
 293
 294 int
 295 udev_enumerate_add_nomatch_regex(struct udev_enumerate *udev_enum,
 296                                 const char *key,
 297                                 char *expr)
 298 {
 299         int ret;
 300
 301         ret = _udev_enumerate_filter_add_match_gen(udev_enum,
 302                                                  EVENT_FILTER_TYPE_REGEX,
 303                                                  1,
 304                                                  key,
 305                                                  expr);
 306
 307         return ret;
 308 }
 309
 310 int
 311 _udev_enumerate_filter_add_match_gen(struct udev_enumerate *udev_enum,
 312                                      int type,
 313                                      int neg,
 314                                      const char *key,
 315                                      char *expr)
 316 {
 317         prop_array_t            pa;
 318         int error;
 319
 320         if (udev_enum->ev_filt == NULL) {
 321                 pa = prop_array_create_with_capacity(5);
 322                 if (pa == NULL)
 323                         return -1;
 324
 325                 udev_enum->ev_filt = pa;
 326         }
 327
 328         error = _udev_filter_add_match_gen(udev_enum->ev_filt, type, neg, key, expr);
 329
 330         return error;
 331 }