lib/libdevattr/devattr_device.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/stat.h>
  42 #include <sys/un.h>
  43 #include <cpu/inttypes.h>
  44
  45 #include <err.h>
  46 #include <errno.h>
  47 #include <fcntl.h>
  48 #include <libgen.h>
  49 #include <regex.h>
  50 #include <signal.h>
  51 #include <stdarg.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55 #include <syslog.h>
  56 #include <unistd.h>
  57 #include <pthread.h>
  58
  59 #include <libprop/proplib.h>
  60 #include <sys/udev.h>
  61 #define LIBDEVATTR_INTERNAL
  62 #include "devattr.h"
  63
  64 struct udev_device {
  65         struct udev     *udev_ctx;
  66         prop_dictionary_t       dict;
  67         int     ev_type;
  68         int     refs;
  69 };
  70
  71 struct udev_device *
  72 udev_device_new_from_dictionary(struct udev *udev_ctx, prop_dictionary_t dict)
  73 {
  74         struct udev_device *udev_dev;
  75
  76         udev_dev = malloc(sizeof(struct udev_device));
  77         if (udev_dev == NULL)
  78                 return NULL;
  79
  80         udev_dev->refs = 1;
  81         udev_dev->ev_type = UDEV_EVENT_NONE;
  82
  83         if (dict != NULL)
  84                 prop_object_retain(dict);
  85
  86         udev_dev->dict = dict;
  87         udev_dev->udev_ctx = udev_ref(udev_ctx);
  88
  89         return udev_dev;
  90 }
  91
  92 struct udev_device *
  93 udev_device_ref(struct udev_device *udev_device)
  94 {
  95         atomic_add_int(&udev_device->refs, 1);
  96
  97         return udev_device;
  98 }
  99
 100 void
 101 udev_device_unref(struct udev_device *udev_device)
 102 {
 103         int refcount;
 104
 105         refcount = atomic_fetchadd_int(&udev_device->refs, -1);
 106
 107         if (refcount == 1) {
 108                 atomic_subtract_int(&udev_device->refs, 0x400); /* in destruction */
 109                 if (udev_device->dict != NULL)
 110                         prop_object_release(udev_device->dict);
 111
 112                 udev_unref(udev_device->udev_ctx);
 113                 free(udev_device);
 114         }
 115 }
 116
 117 void
 118 udev_device_set_action(struct udev_device *udev_device, int action)
 119 {
 120         udev_device->ev_type = action;
 121 }
 122
 123 const char *
 124 udev_device_get_action(struct udev_device *udev_device)
 125 {
 126         const char *action;
 127
 128         switch (udev_device->ev_type) {
 129         case UDEV_EVENT_ATTACH:
 130                 action = "add";
 131                 break;
 132
 133         case UDEV_EVENT_DETACH:
 134                 action = "remove";
 135                 break;
 136
 137         default:
 138                 action = "none";
 139                 break;
 140         }
 141
 142         return action;
 143 }
 144
 145 dev_t
 146 udev_device_get_devnum(struct udev_device *udev_device)
 147 {
 148         prop_number_t pn;
 149         dev_t devnum;
 150
 151         if (udev_device->dict == NULL)
 152                 return 0;
 153
 154         pn = prop_dictionary_get(udev_device->dict, "devnum");
 155         if (pn == NULL)
 156                 return 0;
 157
 158         devnum = prop_number_unsigned_integer_value(pn);
 159
 160         return devnum;
 161 }
 162
 163 uint64_t
 164 udev_device_get_kptr(struct udev_device *udev_device)
 165 {
 166         prop_number_t pn;
 167         uint64_t kptr;
 168
 169         if (udev_device->dict == NULL)
 170                 return 0;
 171
 172         pn = prop_dictionary_get(udev_device->dict, "kptr");
 173         if (pn == NULL)
 174                 return 0;
 175
 176         kptr = prop_number_unsigned_integer_value(pn);
 177
 178         return kptr;
 179 }
 180
 181 int32_t
 182 udev_device_get_major(struct udev_device *udev_device)
 183 {
 184         prop_number_t pn;
 185         int32_t major;
 186
 187         if (udev_device->dict == NULL)
 188                 return 0;
 189
 190         pn = prop_dictionary_get(udev_device->dict, "major");
 191         if (pn == NULL)
 192                 return 0;
 193
 194         major = (int32_t)prop_number_integer_value(pn);
 195
 196         return major;
 197 }
 198
 199 int32_t
 200 udev_device_get_minor(struct udev_device *udev_device)
 201 {
 202         prop_number_t pn;
 203         int32_t minor;
 204
 205         if (udev_device->dict == NULL)
 206                 return 0;
 207
 208         pn = prop_dictionary_get(udev_device->dict, "minor");
 209         if (pn == NULL)
 210                 return 0;
 211
 212         minor = (int32_t)prop_number_integer_value(pn);
 213
 214         return minor;
 215 }
 216
 217 const char *
 218 udev_device_get_devnode(struct udev_device *udev_device)
 219 {
 220         dev_t devnum;
 221
 222         devnum = udev_device_get_devnum(udev_device);
 223         if (devnum == 0)
 224                 return 0;
 225
 226         return devname(devnum, S_IFCHR);
 227 }
 228
 229 const char *
 230 udev_device_get_property_value(struct udev_device *udev_device,
 231                                 const char *key)
 232 {
 233         prop_object_t   po;
 234         prop_number_t   pn;
 235         prop_string_t   ps;
 236         static char buf[128]; /* XXX: might cause trouble */
 237         const char *str = NULL;
 238
 239         if (udev_device->dict == NULL)
 240                 return NULL;
 241
 242         if ((po = prop_dictionary_get(udev_device->dict, key)) == NULL)
 243                 return NULL;
 244
 245         if (prop_object_type(po) == PROP_TYPE_STRING) {
 246                 ps = po;
 247                 str = __DECONST(char *, prop_string_cstring_nocopy(ps));
 248         } else if (prop_object_type(po) == PROP_TYPE_NUMBER) {
 249                 pn = po;
 250                 if (prop_number_unsigned(pn)) {
 251                         snprintf(buf, sizeof(buf), "%" PRIu64,
 252                             prop_number_unsigned_integer_value(pn));
 253                 } else {
 254                         snprintf(buf, sizeof(buf), "%" PRIi64,
 255                             prop_number_integer_value(pn));
 256                 }
 257                 str = buf;
 258         }
 259         return str;
 260 }
 261
 262 const char *
 263 udev_device_get_subsystem(struct udev_device *udev_device)
 264 {
 265         return udev_device_get_property_value(udev_device, "subsystem");
 266 }
 267
 268 const char *
 269 udev_device_get_driver(struct udev_device *udev_device)
 270 {
 271         return udev_device_get_property_value(udev_device, "driver");
 272 }
 273
 274 prop_dictionary_t
 275 udev_device_get_dictionary(struct udev_device *udev_device)
 276 {
 277         return udev_device->dict;
 278 }
 279
 280 struct udev *
 281 udev_device_get_udev(struct udev_device *udev_device)
 282 {
 283         return udev_device->udev_ctx;
 284 }
 285