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