Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 1 | /* |
| 2 | ** Copyright 2014, The Android Open Source Project |
| 3 | ** |
| 4 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | ** you may not use this file except in compliance with the License. |
| 6 | ** You may obtain a copy of the License at |
| 7 | ** |
| 8 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | ** |
| 10 | ** Unless required by applicable law or agreed to in writing, software |
| 11 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | ** See the License for the specific language governing permissions and |
| 14 | ** limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <ctype.h> |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 18 | #include <pthread.h> |
| 19 | #include <stdlib.h> |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 20 | #include <string.h> |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 21 | #define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ |
| 22 | #include <sys/_system_properties.h> |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 23 | |
| 24 | #include <android/log.h> |
| 25 | |
Mark Salyzyn | facf94c | 2016-03-01 13:45:42 -0800 | [diff] [blame] | 26 | #include "log_portability.h" |
Mark Salyzyn | 6d753fa | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 27 | |
Mark Salyzyn | 2d2e0a5 | 2015-11-06 12:26:52 -0800 | [diff] [blame] | 28 | static pthread_mutex_t lock_loggable = PTHREAD_MUTEX_INITIALIZER; |
| 29 | |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 30 | static int lock() |
Mark Salyzyn | 2d2e0a5 | 2015-11-06 12:26:52 -0800 | [diff] [blame] | 31 | { |
| 32 | /* |
| 33 | * If we trigger a signal handler in the middle of locked activity and the |
| 34 | * signal handler logs a message, we could get into a deadlock state. |
| 35 | */ |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 36 | /* |
| 37 | * Any contention, and we can turn around and use the non-cached method |
| 38 | * in less time than the system call associated with a mutex to deal with |
| 39 | * the contention. |
| 40 | */ |
| 41 | return pthread_mutex_trylock(&lock_loggable); |
Mark Salyzyn | 2d2e0a5 | 2015-11-06 12:26:52 -0800 | [diff] [blame] | 42 | } |
| 43 | |
| 44 | static void unlock() |
| 45 | { |
| 46 | pthread_mutex_unlock(&lock_loggable); |
| 47 | } |
| 48 | |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 49 | struct cache { |
| 50 | const prop_info *pinfo; |
| 51 | uint32_t serial; |
Mark Salyzyn | b004a7f | 2015-12-08 14:52:11 -0800 | [diff] [blame] | 52 | unsigned char c; |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 53 | }; |
| 54 | |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 55 | static int check_cache(struct cache *cache) |
| 56 | { |
| 57 | return cache->pinfo |
| 58 | && __system_property_serial(cache->pinfo) != cache->serial; |
| 59 | } |
| 60 | |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 61 | #define BOOLEAN_TRUE 0xFF |
| 62 | #define BOOLEAN_FALSE 0xFE |
| 63 | |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 64 | static void refresh_cache(struct cache *cache, const char *key) |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 65 | { |
| 66 | char buf[PROP_VALUE_MAX]; |
| 67 | |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 68 | if (!cache->pinfo) { |
| 69 | cache->pinfo = __system_property_find(key); |
| 70 | if (!cache->pinfo) { |
| 71 | return; |
| 72 | } |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 73 | } |
Mark Salyzyn | 504daa6 | 2016-04-14 15:31:56 -0700 | [diff] [blame] | 74 | cache->serial = __system_property_serial(cache->pinfo); |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 75 | __system_property_read(cache->pinfo, 0, buf); |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 76 | switch(buf[0]) { |
| 77 | case 't': case 'T': |
| 78 | cache->c = strcasecmp(buf + 1, "rue") ? buf[0] : BOOLEAN_TRUE; |
| 79 | break; |
| 80 | case 'f': case 'F': |
| 81 | cache->c = strcasecmp(buf + 1, "alse") ? buf[0] : BOOLEAN_FALSE; |
| 82 | break; |
| 83 | default: |
| 84 | cache->c = buf[0]; |
| 85 | } |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 86 | } |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 87 | |
Mark Salyzyn | 2d2e0a5 | 2015-11-06 12:26:52 -0800 | [diff] [blame] | 88 | static int __android_log_level(const char *tag, int default_prio) |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 89 | { |
| 90 | /* sizeof() is used on this array below */ |
| 91 | static const char log_namespace[] = "persist.log.tag."; |
| 92 | static const size_t base_offset = 8; /* skip "persist." */ |
| 93 | /* calculate the size of our key temporary buffer */ |
| 94 | const size_t taglen = (tag && *tag) ? strlen(tag) : 0; |
| 95 | /* sizeof(log_namespace) = strlen(log_namespace) + 1 */ |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 96 | char key[sizeof(log_namespace) + taglen]; /* may be > PROPERTY_KEY_MAX */ |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 97 | char *kp; |
| 98 | size_t i; |
| 99 | char c = 0; |
| 100 | /* |
| 101 | * Single layer cache of four properties. Priorities are: |
| 102 | * log.tag.<tag> |
| 103 | * persist.log.tag.<tag> |
| 104 | * log.tag |
| 105 | * persist.log.tag |
| 106 | * Where the missing tag matches all tags and becomes the |
| 107 | * system global default. We do not support ro.log.tag* . |
| 108 | */ |
Colin Cross | 7a106f7 | 2016-01-29 16:21:31 -0800 | [diff] [blame] | 109 | static char last_tag[PROP_NAME_MAX]; |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 110 | static uint32_t global_serial; |
Mark Salyzyn | 31ca3c3 | 2015-12-22 10:49:02 -0800 | [diff] [blame] | 111 | /* some compilers erroneously see uninitialized use. !not_locked */ |
| 112 | uint32_t current_global_serial = 0; |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 113 | static struct cache tag_cache[2]; |
| 114 | static struct cache global_cache[2]; |
| 115 | int change_detected; |
| 116 | int global_change_detected; |
| 117 | int not_locked; |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 118 | |
| 119 | strcpy(key, log_namespace); |
| 120 | |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 121 | global_change_detected = change_detected = not_locked = lock(); |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 122 | |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 123 | if (!not_locked) { |
| 124 | /* |
| 125 | * check all known serial numbers to changes. |
| 126 | */ |
| 127 | for (i = 0; i < (sizeof(tag_cache) / sizeof(tag_cache[0])); ++i) { |
| 128 | if (check_cache(&tag_cache[i])) { |
| 129 | change_detected = 1; |
| 130 | } |
| 131 | } |
| 132 | for (i = 0; i < (sizeof(global_cache) / sizeof(global_cache[0])); ++i) { |
| 133 | if (check_cache(&global_cache[i])) { |
| 134 | global_change_detected = 1; |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | current_global_serial = __system_property_area_serial(); |
| 139 | if (current_global_serial != global_serial) { |
| 140 | change_detected = 1; |
| 141 | global_change_detected = 1; |
| 142 | } |
| 143 | } |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 144 | |
| 145 | if (taglen) { |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 146 | int local_change_detected = change_detected; |
| 147 | if (!not_locked) { |
Colin Cross | 7a106f7 | 2016-01-29 16:21:31 -0800 | [diff] [blame] | 148 | if (!last_tag[0] |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 149 | || (last_tag[0] != tag[0]) |
Colin Cross | 7a106f7 | 2016-01-29 16:21:31 -0800 | [diff] [blame] | 150 | || strncmp(last_tag + 1, tag + 1, sizeof(last_tag) - 1)) { |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 151 | /* invalidate log.tag.<tag> cache */ |
| 152 | for (i = 0; i < (sizeof(tag_cache) / sizeof(tag_cache[0])); ++i) { |
| 153 | tag_cache[i].pinfo = NULL; |
| 154 | tag_cache[i].c = '\0'; |
| 155 | } |
Colin Cross | 7a106f7 | 2016-01-29 16:21:31 -0800 | [diff] [blame] | 156 | last_tag[0] = '\0'; |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 157 | local_change_detected = 1; |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 158 | } |
Colin Cross | 7a106f7 | 2016-01-29 16:21:31 -0800 | [diff] [blame] | 159 | if (!last_tag[0]) { |
| 160 | strncpy(last_tag, tag, sizeof(last_tag)); |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 161 | } |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 162 | } |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 163 | strcpy(key + sizeof(log_namespace) - 1, tag); |
| 164 | |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 165 | kp = key; |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 166 | for (i = 0; i < (sizeof(tag_cache) / sizeof(tag_cache[0])); ++i) { |
| 167 | struct cache *cache = &tag_cache[i]; |
| 168 | struct cache temp_cache; |
| 169 | |
| 170 | if (not_locked) { |
| 171 | temp_cache.pinfo = NULL; |
| 172 | temp_cache.c = '\0'; |
| 173 | cache = &temp_cache; |
| 174 | } |
| 175 | if (local_change_detected) { |
| 176 | refresh_cache(cache, kp); |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 177 | } |
| 178 | |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 179 | if (cache->c) { |
| 180 | c = cache->c; |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 181 | break; |
| 182 | } |
| 183 | |
| 184 | kp = key + base_offset; |
Mark Salyzyn | 1f028b2 | 2014-10-08 15:58:40 -0700 | [diff] [blame] | 185 | } |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 186 | } |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 187 | |
| 188 | switch (toupper(c)) { /* if invalid, resort to global */ |
| 189 | case 'V': |
| 190 | case 'D': |
| 191 | case 'I': |
| 192 | case 'W': |
| 193 | case 'E': |
| 194 | case 'F': /* Not officially supported */ |
| 195 | case 'A': |
| 196 | case 'S': |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 197 | case BOOLEAN_FALSE: /* Not officially supported */ |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 198 | break; |
| 199 | default: |
| 200 | /* clear '.' after log.tag */ |
| 201 | key[sizeof(log_namespace) - 2] = '\0'; |
| 202 | |
| 203 | kp = key; |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 204 | for (i = 0; i < (sizeof(global_cache) / sizeof(global_cache[0])); ++i) { |
| 205 | struct cache *cache = &global_cache[i]; |
| 206 | struct cache temp_cache; |
| 207 | |
| 208 | if (not_locked) { |
| 209 | temp_cache = *cache; |
| 210 | if (temp_cache.pinfo != cache->pinfo) { /* check atomic */ |
| 211 | temp_cache.pinfo = NULL; |
| 212 | temp_cache.c = '\0'; |
| 213 | } |
| 214 | cache = &temp_cache; |
| 215 | } |
| 216 | if (global_change_detected) { |
| 217 | refresh_cache(cache, kp); |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 218 | } |
| 219 | |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 220 | if (cache->c) { |
| 221 | c = cache->c; |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 222 | break; |
| 223 | } |
| 224 | |
| 225 | kp = key + base_offset; |
| 226 | } |
| 227 | break; |
| 228 | } |
| 229 | |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 230 | if (!not_locked) { |
| 231 | global_serial = current_global_serial; |
| 232 | unlock(); |
| 233 | } |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 234 | |
| 235 | switch (toupper(c)) { |
| 236 | case 'V': return ANDROID_LOG_VERBOSE; |
| 237 | case 'D': return ANDROID_LOG_DEBUG; |
| 238 | case 'I': return ANDROID_LOG_INFO; |
| 239 | case 'W': return ANDROID_LOG_WARN; |
| 240 | case 'E': return ANDROID_LOG_ERROR; |
| 241 | case 'F': /* FALLTHRU */ /* Not officially supported */ |
| 242 | case 'A': return ANDROID_LOG_FATAL; |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 243 | case BOOLEAN_FALSE: /* FALLTHRU */ /* Not Officially supported */ |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 244 | case 'S': return -1; /* ANDROID_LOG_SUPPRESS */ |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 245 | } |
Mark Salyzyn | 2d2e0a5 | 2015-11-06 12:26:52 -0800 | [diff] [blame] | 246 | return default_prio; |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 247 | } |
| 248 | |
Mark Salyzyn | 6d753fa | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 249 | LIBLOG_ABI_PUBLIC int __android_log_is_loggable(int prio, const char *tag, |
| 250 | int default_prio) |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 251 | { |
Mark Salyzyn | 2d2e0a5 | 2015-11-06 12:26:52 -0800 | [diff] [blame] | 252 | int logLevel = __android_log_level(tag, default_prio); |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 253 | return logLevel >= 0 && prio >= logLevel; |
| 254 | } |
Mark Salyzyn | 500afc7 | 2015-09-08 08:32:01 -0700 | [diff] [blame] | 255 | |
Mark Salyzyn | f58e58a | 2016-03-25 15:50:46 -0700 | [diff] [blame] | 256 | LIBLOG_HIDDEN int __android_log_is_debuggable() |
| 257 | { |
| 258 | static uint32_t serial; |
| 259 | static struct cache tag_cache; |
| 260 | static const char key[] = "ro.debuggable"; |
| 261 | int ret; |
| 262 | |
| 263 | if (tag_cache.c) { /* ro property does not change after set */ |
| 264 | ret = tag_cache.c == '1'; |
| 265 | } else if (lock()) { |
| 266 | struct cache temp_cache = { NULL, -1, '\0' }; |
| 267 | refresh_cache(&temp_cache, key); |
| 268 | ret = temp_cache.c == '1'; |
| 269 | } else { |
| 270 | int change_detected = check_cache(&tag_cache); |
| 271 | uint32_t current_serial = __system_property_area_serial(); |
| 272 | if (current_serial != serial) { |
| 273 | change_detected = 1; |
| 274 | } |
| 275 | if (change_detected) { |
| 276 | refresh_cache(&tag_cache, key); |
| 277 | serial = current_serial; |
| 278 | } |
| 279 | ret = tag_cache.c == '1'; |
| 280 | |
| 281 | unlock(); |
| 282 | } |
| 283 | |
| 284 | return ret; |
| 285 | } |
| 286 | |
Mark Salyzyn | 2d2e0a5 | 2015-11-06 12:26:52 -0800 | [diff] [blame] | 287 | /* |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 288 | * For properties that are read often, but generally remain constant. |
| 289 | * Since a change is rare, we will accept a trylock failure gracefully. |
| 290 | * Use a separate lock from is_loggable to keep contention down b/25563384. |
Mark Salyzyn | 2d2e0a5 | 2015-11-06 12:26:52 -0800 | [diff] [blame] | 291 | */ |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 292 | struct cache2 { |
| 293 | pthread_mutex_t lock; |
| 294 | uint32_t serial; |
| 295 | const char *key_persist; |
| 296 | struct cache cache_persist; |
| 297 | const char *key_ro; |
| 298 | struct cache cache_ro; |
| 299 | unsigned char (*const evaluate)(const struct cache2 *self); |
| 300 | }; |
Mark Salyzyn | 2d2e0a5 | 2015-11-06 12:26:52 -0800 | [diff] [blame] | 301 | |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 302 | static inline unsigned char do_cache2(struct cache2 *self) |
Mark Salyzyn | 500afc7 | 2015-09-08 08:32:01 -0700 | [diff] [blame] | 303 | { |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 304 | uint32_t current_serial; |
| 305 | int change_detected; |
| 306 | unsigned char c; |
Mark Salyzyn | 500afc7 | 2015-09-08 08:32:01 -0700 | [diff] [blame] | 307 | |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 308 | if (pthread_mutex_trylock(&self->lock)) { |
Mark Salyzyn | 2d2e0a5 | 2015-11-06 12:26:52 -0800 | [diff] [blame] | 309 | /* We are willing to accept some race in this context */ |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 310 | return self->evaluate(self); |
Mark Salyzyn | 500afc7 | 2015-09-08 08:32:01 -0700 | [diff] [blame] | 311 | } |
Mark Salyzyn | 500afc7 | 2015-09-08 08:32:01 -0700 | [diff] [blame] | 312 | |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 313 | change_detected = check_cache(&self->cache_persist) |
| 314 | || check_cache(&self->cache_ro); |
| 315 | current_serial = __system_property_area_serial(); |
| 316 | if (current_serial != self->serial) { |
| 317 | change_detected = 1; |
| 318 | } |
| 319 | if (change_detected) { |
| 320 | refresh_cache(&self->cache_persist, self->key_persist); |
| 321 | refresh_cache(&self->cache_ro, self->key_ro); |
| 322 | self->serial = current_serial; |
| 323 | } |
| 324 | c = self->evaluate(self); |
| 325 | |
| 326 | pthread_mutex_unlock(&self->lock); |
| 327 | |
| 328 | return c; |
| 329 | } |
| 330 | |
| 331 | static unsigned char evaluate_persist_ro(const struct cache2 *self) |
| 332 | { |
| 333 | unsigned char c = self->cache_persist.c; |
| 334 | |
| 335 | if (c) { |
| 336 | return c; |
| 337 | } |
| 338 | |
| 339 | return self->cache_ro.c; |
Mark Salyzyn | 500afc7 | 2015-09-08 08:32:01 -0700 | [diff] [blame] | 340 | } |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 341 | |
| 342 | /* |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 343 | * Timestamp state generally remains constant, but can change at any time |
| 344 | * to handle developer requirements. |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 345 | */ |
Mark Salyzyn | 6d753fa | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 346 | LIBLOG_ABI_PUBLIC clockid_t android_log_clockid() |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 347 | { |
| 348 | static struct cache2 clockid = { |
| 349 | PTHREAD_MUTEX_INITIALIZER, |
| 350 | 0, |
| 351 | "persist.logd.timestamp", |
| 352 | { NULL, -1, '\0' }, |
| 353 | "ro.logd.timestamp", |
| 354 | { NULL, -1, '\0' }, |
| 355 | evaluate_persist_ro |
| 356 | }; |
| 357 | |
| 358 | return (tolower(do_cache2(&clockid)) == 'm') |
| 359 | ? CLOCK_MONOTONIC |
| 360 | : CLOCK_REALTIME; |
| 361 | } |
| 362 | |
| 363 | /* |
| 364 | * Security state generally remains constant, but the DO must be able |
| 365 | * to turn off logging should it become spammy after an attack is detected. |
| 366 | */ |
| 367 | static unsigned char evaluate_security(const struct cache2 *self) |
| 368 | { |
| 369 | unsigned char c = self->cache_ro.c; |
| 370 | |
| 371 | return (c != BOOLEAN_FALSE) && c && (self->cache_persist.c == BOOLEAN_TRUE); |
| 372 | } |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 373 | |
Mark Salyzyn | 6d753fa | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 374 | LIBLOG_ABI_PUBLIC int __android_log_security() |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 375 | { |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 376 | static struct cache2 security = { |
| 377 | PTHREAD_MUTEX_INITIALIZER, |
| 378 | 0, |
| 379 | "persist.logd.security", |
| 380 | { NULL, -1, BOOLEAN_FALSE }, |
| 381 | "ro.device_owner", |
| 382 | { NULL, -1, BOOLEAN_FALSE }, |
| 383 | evaluate_security |
| 384 | }; |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 385 | |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 386 | return do_cache2(&security); |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 387 | } |