The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 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 | * Intercepts log messages intended for the Android log device. |
| 18 | * When running in the context of the simulator, the messages are |
| 19 | * passed on to the underlying (fake) log device. When not in the |
| 20 | * simulator, messages are printed to stderr. |
| 21 | */ |
| 22 | #include "cutils/logd.h" |
| 23 | |
| 24 | #include <stdlib.h> |
| 25 | #include <string.h> |
| 26 | #include <ctype.h> |
| 27 | #include <errno.h> |
| 28 | #include <fcntl.h> |
| 29 | |
| 30 | #ifdef HAVE_PTHREADS |
| 31 | #include <pthread.h> |
| 32 | #endif |
| 33 | |
| 34 | #define kMaxTagLen 16 /* from the long-dead utils/Log.cpp */ |
| 35 | |
| 36 | #define kTagSetSize 16 /* arbitrary */ |
| 37 | |
| 38 | #if 0 |
| 39 | #define TRACE(...) printf("fake_log_device: " __VA_ARGS__) |
| 40 | #else |
| 41 | #define TRACE(...) ((void)0) |
| 42 | #endif |
| 43 | |
| 44 | /* from the long-dead utils/Log.cpp */ |
| 45 | typedef enum { |
| 46 | FORMAT_OFF = 0, |
| 47 | FORMAT_BRIEF, |
| 48 | FORMAT_PROCESS, |
| 49 | FORMAT_TAG, |
| 50 | FORMAT_THREAD, |
| 51 | FORMAT_RAW, |
| 52 | FORMAT_TIME, |
| 53 | FORMAT_THREADTIME, |
| 54 | FORMAT_LONG |
| 55 | } LogFormat; |
| 56 | |
| 57 | |
| 58 | /* |
| 59 | * Log driver state. |
| 60 | */ |
| 61 | typedef struct LogState { |
| 62 | /* the fake fd that's seen by the user */ |
| 63 | int fakeFd; |
| 64 | |
| 65 | /* a printable name for this fake device */ |
| 66 | char *debugName; |
| 67 | |
| 68 | /* nonzero if this is a binary log */ |
| 69 | int isBinary; |
| 70 | |
| 71 | /* global minimum priority */ |
| 72 | int globalMinPriority; |
| 73 | |
| 74 | /* output format */ |
| 75 | LogFormat outputFormat; |
| 76 | |
| 77 | /* tags and priorities */ |
| 78 | struct { |
| 79 | char tag[kMaxTagLen]; |
| 80 | int minPriority; |
| 81 | } tagSet[kTagSetSize]; |
| 82 | } LogState; |
| 83 | |
| 84 | |
| 85 | #ifdef HAVE_PTHREADS |
| 86 | /* |
| 87 | * Locking. Since we're emulating a device, we need to be prepared |
| 88 | * to have multiple callers at the same time. This lock is used |
| 89 | * to both protect the fd list and to prevent LogStates from being |
| 90 | * freed out from under a user. |
| 91 | */ |
| 92 | static pthread_mutex_t fakeLogDeviceLock = PTHREAD_MUTEX_INITIALIZER; |
| 93 | |
| 94 | static void lock() |
| 95 | { |
| 96 | pthread_mutex_lock(&fakeLogDeviceLock); |
| 97 | } |
| 98 | |
| 99 | static void unlock() |
| 100 | { |
| 101 | pthread_mutex_unlock(&fakeLogDeviceLock); |
| 102 | } |
| 103 | #else // !HAVE_PTHREADS |
| 104 | #define lock() ((void)0) |
| 105 | #define unlock() ((void)0) |
| 106 | #endif // !HAVE_PTHREADS |
| 107 | |
| 108 | |
| 109 | /* |
| 110 | * File descriptor management. |
| 111 | */ |
| 112 | #define FAKE_FD_BASE 10000 |
| 113 | #define MAX_OPEN_LOGS 16 |
| 114 | static LogState *openLogTable[MAX_OPEN_LOGS]; |
| 115 | |
| 116 | /* |
| 117 | * Allocate an fd and associate a new LogState with it. |
| 118 | * The fd is available via the fakeFd field of the return value. |
| 119 | */ |
| 120 | static LogState *createLogState() |
| 121 | { |
| 122 | size_t i; |
| 123 | |
| 124 | for (i = 0; i < sizeof(openLogTable); i++) { |
| 125 | if (openLogTable[i] == NULL) { |
| 126 | openLogTable[i] = calloc(1, sizeof(LogState)); |
| 127 | openLogTable[i]->fakeFd = FAKE_FD_BASE + i; |
| 128 | return openLogTable[i]; |
| 129 | } |
| 130 | } |
| 131 | return NULL; |
| 132 | } |
| 133 | |
| 134 | /* |
| 135 | * Translate an fd to a LogState. |
| 136 | */ |
| 137 | static LogState *fdToLogState(int fd) |
| 138 | { |
| 139 | if (fd >= FAKE_FD_BASE && fd < FAKE_FD_BASE + MAX_OPEN_LOGS) { |
| 140 | return openLogTable[fd - FAKE_FD_BASE]; |
| 141 | } |
| 142 | return NULL; |
| 143 | } |
| 144 | |
| 145 | /* |
| 146 | * Unregister the fake fd and free the memory it pointed to. |
| 147 | */ |
| 148 | static void deleteFakeFd(int fd) |
| 149 | { |
| 150 | LogState *ls; |
| 151 | |
| 152 | lock(); |
| 153 | |
| 154 | ls = fdToLogState(fd); |
| 155 | if (ls != NULL) { |
| 156 | openLogTable[fd - FAKE_FD_BASE] = NULL; |
| 157 | free(ls->debugName); |
| 158 | free(ls); |
| 159 | } |
| 160 | |
| 161 | unlock(); |
| 162 | } |
| 163 | |
| 164 | /* |
| 165 | * Configure logging based on ANDROID_LOG_TAGS environment variable. We |
| 166 | * need to parse a string that looks like |
| 167 | * |
| 168 | * *:v jdwp:d dalvikvm:d dalvikvm-gc:i dalvikvmi:i |
| 169 | * |
| 170 | * The tag (or '*' for the global level) comes first, followed by a colon |
| 171 | * and a letter indicating the minimum priority level we're expected to log. |
| 172 | * This can be used to reveal or conceal logs with specific tags. |
| 173 | * |
| 174 | * We also want to check ANDROID_PRINTF_LOG to determine how the output |
| 175 | * will look. |
| 176 | */ |
| 177 | static void configureInitialState(const char* pathName, LogState* logState) |
| 178 | { |
| 179 | static const int kDevLogLen = sizeof("/dev/log/") - 1; |
| 180 | |
| 181 | logState->debugName = strdup(pathName); |
| 182 | |
| 183 | /* identify binary logs */ |
| 184 | if (strcmp(pathName + kDevLogLen, "events") == 0) { |
| 185 | logState->isBinary = 1; |
| 186 | } |
| 187 | |
| 188 | /* global min priority defaults to "info" level */ |
| 189 | logState->globalMinPriority = ANDROID_LOG_INFO; |
| 190 | |
| 191 | /* |
| 192 | * This is based on the the long-dead utils/Log.cpp code. |
| 193 | */ |
| 194 | const char* tags = getenv("ANDROID_LOG_TAGS"); |
| 195 | TRACE("Found ANDROID_LOG_TAGS='%s'\n", tags); |
| 196 | if (tags != NULL) { |
| 197 | int entry = 0; |
| 198 | |
| 199 | while (*tags != '\0') { |
| 200 | char tagName[kMaxTagLen]; |
| 201 | int i, minPrio; |
| 202 | |
| 203 | while (isspace(*tags)) |
| 204 | tags++; |
| 205 | |
| 206 | i = 0; |
| 207 | while (*tags != '\0' && !isspace(*tags) && *tags != ':' && |
| 208 | i < kMaxTagLen) |
| 209 | { |
| 210 | tagName[i++] = *tags++; |
| 211 | } |
| 212 | if (i == kMaxTagLen) { |
| 213 | TRACE("ERROR: env tag too long (%d chars max)\n", kMaxTagLen-1); |
| 214 | return; |
| 215 | } |
| 216 | tagName[i] = '\0'; |
| 217 | |
| 218 | /* default priority, if there's no ":" part; also zero out '*' */ |
| 219 | minPrio = ANDROID_LOG_VERBOSE; |
| 220 | if (tagName[0] == '*' && tagName[1] == '\0') { |
| 221 | minPrio = ANDROID_LOG_DEBUG; |
| 222 | tagName[0] = '\0'; |
| 223 | } |
| 224 | |
| 225 | if (*tags == ':') { |
| 226 | tags++; |
| 227 | if (*tags >= '0' && *tags <= '9') { |
| 228 | if (*tags >= ('0' + ANDROID_LOG_SILENT)) |
| 229 | minPrio = ANDROID_LOG_VERBOSE; |
| 230 | else |
| 231 | minPrio = *tags - '\0'; |
| 232 | } else { |
| 233 | switch (*tags) { |
| 234 | case 'v': minPrio = ANDROID_LOG_VERBOSE; break; |
| 235 | case 'd': minPrio = ANDROID_LOG_DEBUG; break; |
| 236 | case 'i': minPrio = ANDROID_LOG_INFO; break; |
| 237 | case 'w': minPrio = ANDROID_LOG_WARN; break; |
| 238 | case 'e': minPrio = ANDROID_LOG_ERROR; break; |
| 239 | case 'f': minPrio = ANDROID_LOG_FATAL; break; |
| 240 | case 's': minPrio = ANDROID_LOG_SILENT; break; |
| 241 | default: minPrio = ANDROID_LOG_DEFAULT; break; |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | tags++; |
| 246 | if (*tags != '\0' && !isspace(*tags)) { |
| 247 | TRACE("ERROR: garbage in tag env; expected whitespace\n"); |
| 248 | TRACE(" env='%s'\n", tags); |
| 249 | return; |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | if (tagName[0] == 0) { |
| 254 | logState->globalMinPriority = minPrio; |
| 255 | TRACE("+++ global min prio %d\n", logState->globalMinPriority); |
| 256 | } else { |
| 257 | logState->tagSet[entry].minPriority = minPrio; |
| 258 | strcpy(logState->tagSet[entry].tag, tagName); |
| 259 | TRACE("+++ entry %d: %s:%d\n", |
| 260 | entry, |
| 261 | logState->tagSet[entry].tag, |
| 262 | logState->tagSet[entry].minPriority); |
| 263 | entry++; |
| 264 | } |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | |
| 269 | /* |
| 270 | * Taken from the long-dead utils/Log.cpp |
| 271 | */ |
| 272 | const char* fstr = getenv("ANDROID_PRINTF_LOG"); |
| 273 | LogFormat format; |
| 274 | if (fstr == NULL) { |
| 275 | format = FORMAT_BRIEF; |
| 276 | } else { |
| 277 | if (strcmp(fstr, "brief") == 0) |
| 278 | format = FORMAT_BRIEF; |
| 279 | else if (strcmp(fstr, "process") == 0) |
| 280 | format = FORMAT_PROCESS; |
| 281 | else if (strcmp(fstr, "tag") == 0) |
| 282 | format = FORMAT_PROCESS; |
| 283 | else if (strcmp(fstr, "thread") == 0) |
| 284 | format = FORMAT_PROCESS; |
| 285 | else if (strcmp(fstr, "raw") == 0) |
| 286 | format = FORMAT_PROCESS; |
| 287 | else if (strcmp(fstr, "time") == 0) |
| 288 | format = FORMAT_PROCESS; |
| 289 | else if (strcmp(fstr, "long") == 0) |
| 290 | format = FORMAT_PROCESS; |
| 291 | else |
| 292 | format = (LogFormat) atoi(fstr); // really?! |
| 293 | } |
| 294 | |
| 295 | logState->outputFormat = format; |
| 296 | } |
| 297 | |
| 298 | /* |
| 299 | * Return a human-readable string for the priority level. Always returns |
| 300 | * a valid string. |
| 301 | */ |
| 302 | static const char* getPriorityString(int priority) |
| 303 | { |
| 304 | /* the first character of each string should be unique */ |
| 305 | static const char* priorityStrings[] = { |
| 306 | "Verbose", "Debug", "Info", "Warn", "Error", "Assert" |
| 307 | }; |
| 308 | int idx; |
| 309 | |
| 310 | idx = (int) priority - (int) ANDROID_LOG_VERBOSE; |
| 311 | if (idx < 0 || |
| 312 | idx >= (int) (sizeof(priorityStrings) / sizeof(priorityStrings[0]))) |
| 313 | return "?unknown?"; |
| 314 | return priorityStrings[idx]; |
| 315 | } |
| 316 | |
| 317 | #ifndef HAVE_WRITEV |
| 318 | /* |
| 319 | * Some platforms like WIN32 do not have writev(). |
| 320 | * Make up something to replace it. |
| 321 | */ |
| 322 | static ssize_t fake_writev(int fd, const struct iovec *iov, int iovcnt) { |
| 323 | int result = 0; |
| 324 | struct iovec* end = iov + iovcnt; |
| 325 | for (; iov < end; iov++) { |
| 326 | int w = write(fd, iov->iov_base, iov->iov_len); |
| 327 | if (w != iov->iov_len) { |
| 328 | if (w < 0) |
| 329 | return w; |
| 330 | return result + w; |
| 331 | } |
| 332 | result += w; |
| 333 | } |
| 334 | return result; |
| 335 | } |
| 336 | |
| 337 | #define writev fake_writev |
| 338 | #endif |
| 339 | |
| 340 | |
| 341 | /* |
| 342 | * Write a filtered log message to stderr. |
| 343 | * |
| 344 | * Log format parsing taken from the long-dead utils/Log.cpp. |
| 345 | */ |
| 346 | static void showLog(LogState *state, |
| 347 | int logPrio, const char* tag, const char* msg) |
| 348 | { |
| 349 | #if defined(HAVE_LOCALTIME_R) |
| 350 | struct tm tmBuf; |
| 351 | #endif |
| 352 | struct tm* ptm; |
| 353 | char timeBuf[32]; |
| 354 | char prefixBuf[128], suffixBuf[128]; |
| 355 | char priChar; |
| 356 | time_t when; |
| 357 | pid_t pid, tid; |
| 358 | |
| 359 | TRACE("LOG %d: %s %s", logPrio, tag, msg); |
| 360 | |
| 361 | priChar = getPriorityString(logPrio)[0]; |
| 362 | when = time(NULL); |
| 363 | pid = tid = getpid(); // find gettid()? |
| 364 | |
| 365 | /* |
| 366 | * Get the current date/time in pretty form |
| 367 | * |
| 368 | * It's often useful when examining a log with "less" to jump to |
| 369 | * a specific point in the file by searching for the date/time stamp. |
| 370 | * For this reason it's very annoying to have regexp meta characters |
| 371 | * in the time stamp. Don't use forward slashes, parenthesis, |
| 372 | * brackets, asterisks, or other special chars here. |
| 373 | */ |
| 374 | #if defined(HAVE_LOCALTIME_R) |
| 375 | ptm = localtime_r(&when, &tmBuf); |
| 376 | #else |
| 377 | ptm = localtime(&when); |
| 378 | #endif |
| 379 | //strftime(timeBuf, sizeof(timeBuf), "%Y-%m-%d %H:%M:%S", ptm); |
| 380 | strftime(timeBuf, sizeof(timeBuf), "%m-%d %H:%M:%S", ptm); |
| 381 | |
| 382 | /* |
| 383 | * Construct a buffer containing the log header and log message. |
| 384 | */ |
| 385 | size_t prefixLen, suffixLen; |
| 386 | |
| 387 | switch (state->outputFormat) { |
| 388 | case FORMAT_TAG: |
| 389 | prefixLen = snprintf(prefixBuf, sizeof(prefixBuf), |
| 390 | "%c/%-8s: ", priChar, tag); |
| 391 | strcpy(suffixBuf, "\n"); suffixLen = 1; |
| 392 | break; |
| 393 | case FORMAT_PROCESS: |
| 394 | prefixLen = snprintf(prefixBuf, sizeof(prefixBuf), |
| 395 | "%c(%5d) ", priChar, pid); |
| 396 | suffixLen = snprintf(suffixBuf, sizeof(suffixBuf), |
| 397 | " (%s)\n", tag); |
| 398 | break; |
| 399 | case FORMAT_THREAD: |
| 400 | prefixLen = snprintf(prefixBuf, sizeof(prefixBuf), |
Andrew Hsieh | d2c8f52 | 2012-02-27 16:48:18 -0800 | [diff] [blame^] | 401 | "%c(%5d:%5d) ", priChar, pid, tid); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 402 | strcpy(suffixBuf, "\n"); suffixLen = 1; |
| 403 | break; |
| 404 | case FORMAT_RAW: |
| 405 | prefixBuf[0] = 0; prefixLen = 0; |
| 406 | strcpy(suffixBuf, "\n"); suffixLen = 1; |
| 407 | break; |
| 408 | case FORMAT_TIME: |
| 409 | prefixLen = snprintf(prefixBuf, sizeof(prefixBuf), |
| 410 | "%s %-8s\n\t", timeBuf, tag); |
| 411 | strcpy(suffixBuf, "\n"); suffixLen = 1; |
| 412 | break; |
| 413 | case FORMAT_THREADTIME: |
| 414 | prefixLen = snprintf(prefixBuf, sizeof(prefixBuf), |
| 415 | "%s %5d %5d %c %-8s \n\t", timeBuf, pid, tid, priChar, tag); |
| 416 | strcpy(suffixBuf, "\n"); suffixLen = 1; |
| 417 | break; |
| 418 | case FORMAT_LONG: |
| 419 | prefixLen = snprintf(prefixBuf, sizeof(prefixBuf), |
Andrew Hsieh | d2c8f52 | 2012-02-27 16:48:18 -0800 | [diff] [blame^] | 420 | "[ %s %5d:%5d %c/%-8s ]\n", |
| 421 | timeBuf, pid, tid, priChar, tag); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 422 | strcpy(suffixBuf, "\n\n"); suffixLen = 2; |
| 423 | break; |
| 424 | default: |
| 425 | prefixLen = snprintf(prefixBuf, sizeof(prefixBuf), |
| 426 | "%c/%-8s(%5d): ", priChar, tag, pid); |
| 427 | strcpy(suffixBuf, "\n"); suffixLen = 1; |
| 428 | break; |
| 429 | } |
| 430 | |
| 431 | /* |
| 432 | * Figure out how many lines there will be. |
| 433 | */ |
| 434 | const char* end = msg + strlen(msg); |
| 435 | size_t numLines = 0; |
| 436 | const char* p = msg; |
| 437 | while (p < end) { |
| 438 | if (*p++ == '\n') numLines++; |
| 439 | } |
| 440 | if (p > msg && *(p-1) != '\n') numLines++; |
| 441 | |
| 442 | /* |
| 443 | * Create an array of iovecs large enough to write all of |
| 444 | * the lines with a prefix and a suffix. |
| 445 | */ |
| 446 | const size_t INLINE_VECS = 6; |
| 447 | const size_t MAX_LINES = ((size_t)~0)/(3*sizeof(struct iovec*)); |
| 448 | struct iovec stackVec[INLINE_VECS]; |
| 449 | struct iovec* vec = stackVec; |
| 450 | size_t numVecs; |
| 451 | |
| 452 | if (numLines > MAX_LINES) |
| 453 | numLines = MAX_LINES; |
| 454 | |
| 455 | numVecs = numLines*3; // 3 iovecs per line. |
| 456 | if (numVecs > INLINE_VECS) { |
Carl Shapiro | 2a7f2ae | 2010-04-09 18:23:25 -0700 | [diff] [blame] | 457 | vec = (struct iovec*)malloc(sizeof(struct iovec)*numVecs); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 458 | if (vec == NULL) { |
| 459 | msg = "LOG: write failed, no memory"; |
| 460 | numVecs = 3; |
| 461 | numLines = 1; |
| 462 | vec = stackVec; |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | /* |
| 467 | * Fill in the iovec pointers. |
| 468 | */ |
| 469 | p = msg; |
| 470 | struct iovec* v = vec; |
| 471 | int totalLen = 0; |
| 472 | while (numLines > 0 && p < end) { |
| 473 | if (prefixLen > 0) { |
| 474 | v->iov_base = prefixBuf; |
| 475 | v->iov_len = prefixLen; |
| 476 | totalLen += prefixLen; |
| 477 | v++; |
| 478 | } |
| 479 | const char* start = p; |
| 480 | while (p < end && *p != '\n') p++; |
| 481 | if ((p-start) > 0) { |
| 482 | v->iov_base = (void*)start; |
| 483 | v->iov_len = p-start; |
| 484 | totalLen += p-start; |
| 485 | v++; |
| 486 | } |
| 487 | if (*p == '\n') p++; |
| 488 | if (suffixLen > 0) { |
| 489 | v->iov_base = suffixBuf; |
| 490 | v->iov_len = suffixLen; |
| 491 | totalLen += suffixLen; |
| 492 | v++; |
| 493 | } |
| 494 | numLines -= 1; |
| 495 | } |
| 496 | |
| 497 | /* |
| 498 | * Write the entire message to the log file with a single writev() call. |
| 499 | * We need to use this rather than a collection of printf()s on a FILE* |
| 500 | * because of multi-threading and multi-process issues. |
| 501 | * |
| 502 | * If the file was not opened with O_APPEND, this will produce interleaved |
| 503 | * output when called on the same file from multiple processes. |
| 504 | * |
| 505 | * If the file descriptor is actually a network socket, the writev() |
| 506 | * call may return with a partial write. Putting the writev() call in |
| 507 | * a loop can result in interleaved data. This can be alleviated |
| 508 | * somewhat by wrapping the writev call in the Mutex. |
| 509 | */ |
| 510 | |
| 511 | for(;;) { |
| 512 | int cc = writev(fileno(stderr), vec, v-vec); |
| 513 | |
| 514 | if (cc == totalLen) break; |
| 515 | |
| 516 | if (cc < 0) { |
| 517 | if(errno == EINTR) continue; |
| 518 | |
| 519 | /* can't really log the failure; for now, throw out a stderr */ |
| 520 | fprintf(stderr, "+++ LOG: write failed (errno=%d)\n", errno); |
| 521 | break; |
| 522 | } else { |
| 523 | /* shouldn't happen when writing to file or tty */ |
| 524 | fprintf(stderr, "+++ LOG: write partial (%d of %d)\n", cc, totalLen); |
| 525 | break; |
| 526 | } |
| 527 | } |
| 528 | |
| 529 | /* if we allocated storage for the iovecs, free it */ |
| 530 | if (vec != stackVec) |
| 531 | free(vec); |
| 532 | } |
| 533 | |
| 534 | |
| 535 | /* |
| 536 | * Receive a log message. We happen to know that "vector" has three parts: |
| 537 | * |
| 538 | * priority (1 byte) |
| 539 | * tag (N bytes -- null-terminated ASCII string) |
| 540 | * message (N bytes -- null-terminated ASCII string) |
| 541 | */ |
| 542 | static ssize_t logWritev(int fd, const struct iovec* vector, int count) |
| 543 | { |
| 544 | LogState* state; |
| 545 | |
| 546 | /* Make sure that no-one frees the LogState while we're using it. |
| 547 | * Also guarantees that only one thread is in showLog() at a given |
| 548 | * time (if it matters). |
| 549 | */ |
| 550 | lock(); |
| 551 | |
| 552 | state = fdToLogState(fd); |
| 553 | if (state == NULL) { |
| 554 | errno = EBADF; |
| 555 | goto error; |
| 556 | } |
| 557 | |
| 558 | if (state->isBinary) { |
| 559 | TRACE("%s: ignoring binary log\n", state->debugName); |
| 560 | goto bail; |
| 561 | } |
| 562 | |
| 563 | if (count != 3) { |
| 564 | TRACE("%s: writevLog with count=%d not expected\n", |
| 565 | state->debugName, count); |
| 566 | goto error; |
| 567 | } |
| 568 | |
| 569 | /* pull out the three fields */ |
| 570 | int logPrio = *(const char*)vector[0].iov_base; |
| 571 | const char* tag = (const char*) vector[1].iov_base; |
| 572 | const char* msg = (const char*) vector[2].iov_base; |
| 573 | |
| 574 | /* see if this log tag is configured */ |
| 575 | int i; |
| 576 | int minPrio = state->globalMinPriority; |
| 577 | for (i = 0; i < kTagSetSize; i++) { |
| 578 | if (state->tagSet[i].minPriority == ANDROID_LOG_UNKNOWN) |
| 579 | break; /* reached end of configured values */ |
| 580 | |
| 581 | if (strcmp(state->tagSet[i].tag, tag) == 0) { |
| 582 | //TRACE("MATCH tag '%s'\n", tag); |
| 583 | minPrio = state->tagSet[i].minPriority; |
| 584 | break; |
| 585 | } |
| 586 | } |
| 587 | |
| 588 | if (logPrio >= minPrio) { |
| 589 | showLog(state, logPrio, tag, msg); |
| 590 | } else { |
| 591 | //TRACE("+++ NOLOG(%d): %s %s", logPrio, tag, msg); |
| 592 | } |
| 593 | |
| 594 | bail: |
| 595 | unlock(); |
| 596 | return vector[0].iov_len + vector[1].iov_len + vector[2].iov_len; |
| 597 | error: |
| 598 | unlock(); |
| 599 | return -1; |
| 600 | } |
| 601 | |
| 602 | /* |
| 603 | * Free up our state and close the fake descriptor. |
| 604 | */ |
| 605 | static int logClose(int fd) |
| 606 | { |
| 607 | deleteFakeFd(fd); |
| 608 | return 0; |
| 609 | } |
| 610 | |
| 611 | /* |
| 612 | * Open a log output device and return a fake fd. |
| 613 | */ |
| 614 | static int logOpen(const char* pathName, int flags) |
| 615 | { |
| 616 | LogState *logState; |
| 617 | int fd = -1; |
| 618 | |
| 619 | lock(); |
| 620 | |
| 621 | logState = createLogState(); |
| 622 | if (logState != NULL) { |
| 623 | configureInitialState(pathName, logState); |
| 624 | fd = logState->fakeFd; |
| 625 | } else { |
| 626 | errno = ENFILE; |
| 627 | } |
| 628 | |
| 629 | unlock(); |
| 630 | |
| 631 | return fd; |
| 632 | } |
| 633 | |
| 634 | |
| 635 | /* |
| 636 | * Runtime redirection. If this binary is running in the simulator, |
| 637 | * just pass log messages to the emulated device. If it's running |
| 638 | * outside of the simulator, write the log messages to stderr. |
| 639 | */ |
| 640 | |
| 641 | static int (*redirectOpen)(const char *pathName, int flags) = NULL; |
| 642 | static int (*redirectClose)(int fd) = NULL; |
| 643 | static ssize_t (*redirectWritev)(int fd, const struct iovec* vector, int count) |
| 644 | = NULL; |
| 645 | |
| 646 | static void setRedirects() |
| 647 | { |
| 648 | const char *ws; |
| 649 | |
| 650 | /* Wrapsim sets this environment variable on children that it's |
| 651 | * created using its LD_PRELOAD wrapper. |
| 652 | */ |
| 653 | ws = getenv("ANDROID_WRAPSIM"); |
| 654 | if (ws != NULL && strcmp(ws, "1") == 0) { |
| 655 | /* We're running inside wrapsim, so we can just write to the device. */ |
| 656 | redirectOpen = (int (*)(const char *pathName, int flags))open; |
| 657 | redirectClose = close; |
| 658 | redirectWritev = writev; |
| 659 | } else { |
| 660 | /* There's no device to delegate to; handle the logging ourselves. */ |
| 661 | redirectOpen = logOpen; |
| 662 | redirectClose = logClose; |
| 663 | redirectWritev = logWritev; |
| 664 | } |
| 665 | } |
| 666 | |
| 667 | int fakeLogOpen(const char *pathName, int flags) |
| 668 | { |
| 669 | if (redirectOpen == NULL) { |
| 670 | setRedirects(); |
| 671 | } |
| 672 | return redirectOpen(pathName, flags); |
| 673 | } |
| 674 | |
| 675 | int fakeLogClose(int fd) |
| 676 | { |
| 677 | /* Assume that open() was called first. */ |
| 678 | return redirectClose(fd); |
| 679 | } |
| 680 | |
| 681 | ssize_t fakeLogWritev(int fd, const struct iovec* vector, int count) |
| 682 | { |
| 683 | /* Assume that open() was called first. */ |
| 684 | return redirectWritev(fd, vector, count); |
| 685 | } |