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 #include <dirent.h> 18 #include <errno.h> 19 #include <fcntl.h> 20 #include <limits.h> 21 #include <poll.h> 22 #include <signal.h> 23 #include <stdarg.h> 24 #include <stdio.h> 25 #include <stdlib.h> 26 #include <string.h> 27 #include <sys/inotify.h> 28 #include <sys/stat.h> 29 #include <sys/time.h> 30 #include <sys/wait.h> 31 #include <sys/klog.h> 32 #include <time.h> 33 #include <unistd.h> 34 #include <sys/prctl.h> 35 36 #include <cutils/debugger.h> 37 #include <cutils/properties.h> 38 #include <cutils/sockets.h> 39 #include <private/android_filesystem_config.h> 40 41 #include <selinux/android.h> 42 43 #include "dumpstate.h" 44 45 /* list of native processes to include in the native dumps */ 46 static const char* native_processes_to_dump[] = { 47 "/system/bin/drmserver", 48 "/system/bin/mediaserver", 49 "/system/bin/sdcard", 50 "/system/bin/surfaceflinger", 51 NULL, 52 }; 53 54 static void __for_each_pid(void (*helper)(int, const char *, void *), const char *header, void *arg) { 55 DIR *d; 56 struct dirent *de; 57 58 if (!(d = opendir("/proc"))) { 59 printf("Failed to open /proc (%s)\n", strerror(errno)); 60 return; 61 } 62 63 printf("\n------ %s ------\n", header); 64 while ((de = readdir(d))) { 65 int pid; 66 int fd; 67 char cmdpath[255]; 68 char cmdline[255]; 69 70 if (!(pid = atoi(de->d_name))) { 71 continue; 72 } 73 74 sprintf(cmdpath,"/proc/%d/cmdline", pid); 75 memset(cmdline, 0, sizeof(cmdline)); 76 if ((fd = open(cmdpath, O_RDONLY)) < 0) { 77 strcpy(cmdline, "N/A"); 78 } else { 79 read(fd, cmdline, sizeof(cmdline) - 1); 80 close(fd); 81 } 82 helper(pid, cmdline, arg); 83 } 84 85 closedir(d); 86 } 87 88 static void for_each_pid_helper(int pid, const char *cmdline, void *arg) { 89 for_each_pid_func *func = arg; 90 func(pid, cmdline); 91 } 92 93 void for_each_pid(for_each_pid_func func, const char *header) { 94 __for_each_pid(for_each_pid_helper, header, func); 95 } 96 97 static void for_each_tid_helper(int pid, const char *cmdline, void *arg) { 98 DIR *d; 99 struct dirent *de; 100 char taskpath[255]; 101 for_each_tid_func *func = arg; 102 103 sprintf(taskpath, "/proc/%d/task", pid); 104 105 if (!(d = opendir(taskpath))) { 106 printf("Failed to open %s (%s)\n", taskpath, strerror(errno)); 107 return; 108 } 109 110 func(pid, pid, cmdline); 111 112 while ((de = readdir(d))) { 113 int tid; 114 int fd; 115 char commpath[255]; 116 char comm[255]; 117 118 if (!(tid = atoi(de->d_name))) { 119 continue; 120 } 121 122 if (tid == pid) 123 continue; 124 125 sprintf(commpath,"/proc/%d/comm", tid); 126 memset(comm, 0, sizeof(comm)); 127 if ((fd = open(commpath, O_RDONLY)) < 0) { 128 strcpy(comm, "N/A"); 129 } else { 130 char *c; 131 read(fd, comm, sizeof(comm) - 1); 132 close(fd); 133 134 c = strrchr(comm, '\n'); 135 if (c) { 136 *c = '\0'; 137 } 138 } 139 func(pid, tid, comm); 140 } 141 142 closedir(d); 143 } 144 145 void for_each_tid(for_each_tid_func func, const char *header) { 146 __for_each_pid(for_each_tid_helper, header, func); 147 } 148 149 void show_wchan(int pid, int tid, const char *name) { 150 char path[255]; 151 char buffer[255]; 152 int fd; 153 char name_buffer[255]; 154 155 memset(buffer, 0, sizeof(buffer)); 156 157 sprintf(path, "/proc/%d/wchan", tid); 158 if ((fd = open(path, O_RDONLY)) < 0) { 159 printf("Failed to open '%s' (%s)\n", path, strerror(errno)); 160 return; 161 } 162 163 if (read(fd, buffer, sizeof(buffer)) < 0) { 164 printf("Failed to read '%s' (%s)\n", path, strerror(errno)); 165 goto out_close; 166 } 167 168 snprintf(name_buffer, sizeof(name_buffer), "%*s%s", 169 pid == tid ? 0 : 3, "", name); 170 171 printf("%-7d %-32s %s\n", tid, name_buffer, buffer); 172 173 out_close: 174 close(fd); 175 return; 176 } 177 178 void do_dmesg() { 179 printf("------ KERNEL LOG (dmesg) ------\n"); 180 /* Get size of kernel buffer */ 181 int size = klogctl(KLOG_SIZE_BUFFER, NULL, 0); 182 if (size <= 0) { 183 printf("Unexpected klogctl return value: %d\n\n", size); 184 return; 185 } 186 char *buf = (char *) malloc(size + 1); 187 if (buf == NULL) { 188 printf("memory allocation failed\n\n"); 189 return; 190 } 191 int retval = klogctl(KLOG_READ_ALL, buf, size); 192 if (retval < 0) { 193 printf("klogctl failure\n\n"); 194 free(buf); 195 return; 196 } 197 buf[retval] = '\0'; 198 printf("%s\n\n", buf); 199 free(buf); 200 return; 201 } 202 203 void do_showmap(int pid, const char *name) { 204 char title[255]; 205 char arg[255]; 206 207 sprintf(title, "SHOW MAP %d (%s)", pid, name); 208 sprintf(arg, "%d", pid); 209 run_command(title, 10, SU_PATH, "root", "showmap", arg, NULL); 210 } 211 212 /* prints the contents of a file */ 213 int dump_file(const char *title, const char* path) { 214 char buffer[32768]; 215 int fd = open(path, O_RDONLY); 216 if (fd < 0) { 217 int err = errno; 218 if (title) printf("------ %s (%s) ------\n", title, path); 219 printf("*** %s: %s\n", path, strerror(err)); 220 if (title) printf("\n"); 221 return -1; 222 } 223 224 if (title) printf("------ %s (%s", title, path); 225 226 if (title) { 227 struct stat st; 228 if (memcmp(path, "/proc/", 6) && memcmp(path, "/sys/", 5) && !fstat(fd, &st)) { 229 char stamp[80]; 230 time_t mtime = st.st_mtime; 231 strftime(stamp, sizeof(stamp), "%Y-%m-%d %H:%M:%S", localtime(&mtime)); 232 printf(": %s", stamp); 233 } 234 printf(") ------\n"); 235 } 236 237 int newline = 0; 238 for (;;) { 239 int ret = read(fd, buffer, sizeof(buffer)); 240 if (ret > 0) { 241 newline = (buffer[ret - 1] == '\n'); 242 ret = fwrite(buffer, ret, 1, stdout); 243 } 244 if (ret <= 0) break; 245 } 246 247 close(fd); 248 if (!newline) printf("\n"); 249 if (title) printf("\n"); 250 return 0; 251 } 252 253 /* forks a command and waits for it to finish */ 254 int run_command(const char *title, int timeout_seconds, const char *command, ...) { 255 fflush(stdout); 256 clock_t start = clock(); 257 pid_t pid = fork(); 258 259 /* handle error case */ 260 if (pid < 0) { 261 printf("*** fork: %s\n", strerror(errno)); 262 return pid; 263 } 264 265 /* handle child case */ 266 if (pid == 0) { 267 const char *args[1024] = {command}; 268 size_t arg; 269 270 /* make sure the child dies when dumpstate dies */ 271 prctl(PR_SET_PDEATHSIG, SIGKILL); 272 273 va_list ap; 274 va_start(ap, command); 275 if (title) printf("------ %s (%s", title, command); 276 for (arg = 1; arg < sizeof(args) / sizeof(args[0]); ++arg) { 277 args[arg] = va_arg(ap, const char *); 278 if (args[arg] == NULL) break; 279 if (title) printf(" %s", args[arg]); 280 } 281 if (title) printf(") ------\n"); 282 fflush(stdout); 283 284 execvp(command, (char**) args); 285 printf("*** exec(%s): %s\n", command, strerror(errno)); 286 fflush(stdout); 287 _exit(-1); 288 } 289 290 /* handle parent case */ 291 for (;;) { 292 int status; 293 pid_t p = waitpid(pid, &status, WNOHANG); 294 float elapsed = (float) (clock() - start) / CLOCKS_PER_SEC; 295 if (p == pid) { 296 if (WIFSIGNALED(status)) { 297 printf("*** %s: Killed by signal %d\n", command, WTERMSIG(status)); 298 } else if (WIFEXITED(status) && WEXITSTATUS(status) > 0) { 299 printf("*** %s: Exit code %d\n", command, WEXITSTATUS(status)); 300 } 301 if (title) printf("[%s: %.1fs elapsed]\n\n", command, elapsed); 302 return status; 303 } 304 305 if (timeout_seconds && elapsed > timeout_seconds) { 306 printf("*** %s: Timed out after %.1fs (killing pid %d)\n", command, elapsed, pid); 307 kill(pid, SIGTERM); 308 return -1; 309 } 310 311 usleep(100000); // poll every 0.1 sec 312 } 313 } 314 315 size_t num_props = 0; 316 static char* props[2000]; 317 318 static void print_prop(const char *key, const char *name, void *user) { 319 (void) user; 320 if (num_props < sizeof(props) / sizeof(props[0])) { 321 char buf[PROPERTY_KEY_MAX + PROPERTY_VALUE_MAX + 10]; 322 snprintf(buf, sizeof(buf), "[%s]: [%s]\n", key, name); 323 props[num_props++] = strdup(buf); 324 } 325 } 326 327 static int compare_prop(const void *a, const void *b) { 328 return strcmp(*(char * const *) a, *(char * const *) b); 329 } 330 331 /* prints all the system properties */ 332 void print_properties() { 333 size_t i; 334 num_props = 0; 335 property_list(print_prop, NULL); 336 qsort(&props, num_props, sizeof(props[0]), compare_prop); 337 338 printf("------ SYSTEM PROPERTIES ------\n"); 339 for (i = 0; i < num_props; ++i) { 340 fputs(props[i], stdout); 341 free(props[i]); 342 } 343 printf("\n"); 344 } 345 346 /* redirect output to a service control socket */ 347 void redirect_to_socket(FILE *redirect, const char *service) { 348 int s = android_get_control_socket(service); 349 if (s < 0) { 350 fprintf(stderr, "android_get_control_socket(%s): %s\n", service, strerror(errno)); 351 exit(1); 352 } 353 if (listen(s, 4) < 0) { 354 fprintf(stderr, "listen(control socket): %s\n", strerror(errno)); 355 exit(1); 356 } 357 358 struct sockaddr addr; 359 socklen_t alen = sizeof(addr); 360 int fd = accept(s, &addr, &alen); 361 if (fd < 0) { 362 fprintf(stderr, "accept(control socket): %s\n", strerror(errno)); 363 exit(1); 364 } 365 366 fflush(redirect); 367 dup2(fd, fileno(redirect)); 368 close(fd); 369 } 370 371 /* redirect output to a file, optionally gzipping; returns gzip pid (or -1) */ 372 pid_t redirect_to_file(FILE *redirect, char *path, int gzip_level) { 373 char *chp = path; 374 375 /* skip initial slash */ 376 if (chp[0] == '/') 377 chp++; 378 379 /* create leading directories, if necessary */ 380 while (chp && chp[0]) { 381 chp = strchr(chp, '/'); 382 if (chp) { 383 *chp = 0; 384 mkdir(path, 0770); /* drwxrwx--- */ 385 *chp++ = '/'; 386 } 387 } 388 389 int fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); 390 if (fd < 0) { 391 fprintf(stderr, "%s: %s\n", path, strerror(errno)); 392 exit(1); 393 } 394 395 pid_t gzip_pid = -1; 396 if (gzip_level > 0) { 397 int fds[2]; 398 if (pipe(fds)) { 399 fprintf(stderr, "pipe: %s\n", strerror(errno)); 400 exit(1); 401 } 402 403 fflush(redirect); 404 fflush(stdout); 405 406 gzip_pid = fork(); 407 if (gzip_pid < 0) { 408 fprintf(stderr, "fork: %s\n", strerror(errno)); 409 exit(1); 410 } 411 412 if (gzip_pid == 0) { 413 dup2(fds[0], STDIN_FILENO); 414 dup2(fd, STDOUT_FILENO); 415 416 close(fd); 417 close(fds[0]); 418 close(fds[1]); 419 420 char level[10]; 421 snprintf(level, sizeof(level), "-%d", gzip_level); 422 execlp("gzip", "gzip", level, NULL); 423 fprintf(stderr, "exec(gzip): %s\n", strerror(errno)); 424 _exit(-1); 425 } 426 427 close(fd); 428 close(fds[0]); 429 fd = fds[1]; 430 } 431 432 dup2(fd, fileno(redirect)); 433 close(fd); 434 return gzip_pid; 435 } 436 437 static bool should_dump_native_traces(const char* path) { 438 for (const char** p = native_processes_to_dump; *p; p++) { 439 if (!strcmp(*p, path)) { 440 return true; 441 } 442 } 443 return false; 444 } 445 446 /* dump Dalvik and native stack traces, return the trace file location (NULL if none) */ 447 const char *dump_traces() { 448 const char* result = NULL; 449 450 char traces_path[PROPERTY_VALUE_MAX] = ""; 451 property_get("dalvik.vm.stack-trace-file", traces_path, ""); 452 if (!traces_path[0]) return NULL; 453 454 /* move the old traces.txt (if any) out of the way temporarily */ 455 char anr_traces_path[PATH_MAX]; 456 strlcpy(anr_traces_path, traces_path, sizeof(anr_traces_path)); 457 strlcat(anr_traces_path, ".anr", sizeof(anr_traces_path)); 458 if (rename(traces_path, anr_traces_path) && errno != ENOENT) { 459 fprintf(stderr, "rename(%s, %s): %s\n", traces_path, anr_traces_path, strerror(errno)); 460 return NULL; // Can't rename old traces.txt -- no permission? -- leave it alone instead 461 } 462 463 /* make the directory if necessary */ 464 char anr_traces_dir[PATH_MAX]; 465 strlcpy(anr_traces_dir, traces_path, sizeof(anr_traces_dir)); 466 char *slash = strrchr(anr_traces_dir, '/'); 467 if (slash != NULL) { 468 *slash = '\0'; 469 if (!mkdir(anr_traces_dir, 0775)) { 470 chown(anr_traces_dir, AID_SYSTEM, AID_SYSTEM); 471 chmod(anr_traces_dir, 0775); 472 if (selinux_android_restorecon(anr_traces_dir) == -1) { 473 fprintf(stderr, "restorecon failed for %s: %s\n", anr_traces_dir, strerror(errno)); 474 } 475 } else if (errno != EEXIST) { 476 fprintf(stderr, "mkdir(%s): %s\n", anr_traces_dir, strerror(errno)); 477 return NULL; 478 } 479 } 480 481 /* create a new, empty traces.txt file to receive stack dumps */ 482 int fd = open(traces_path, O_CREAT | O_WRONLY | O_TRUNC | O_NOFOLLOW, 0666); /* -rw-rw-rw- */ 483 if (fd < 0) { 484 fprintf(stderr, "%s: %s\n", traces_path, strerror(errno)); 485 return NULL; 486 } 487 int chmod_ret = fchmod(fd, 0666); 488 if (chmod_ret < 0) { 489 fprintf(stderr, "fchmod on %s failed: %s\n", traces_path, strerror(errno)); 490 close(fd); 491 return NULL; 492 } 493 494 /* walk /proc and kill -QUIT all Dalvik processes */ 495 DIR *proc = opendir("/proc"); 496 if (proc == NULL) { 497 fprintf(stderr, "/proc: %s\n", strerror(errno)); 498 goto error_close_fd; 499 } 500 501 /* use inotify to find when processes are done dumping */ 502 int ifd = inotify_init(); 503 if (ifd < 0) { 504 fprintf(stderr, "inotify_init: %s\n", strerror(errno)); 505 goto error_close_fd; 506 } 507 508 int wfd = inotify_add_watch(ifd, traces_path, IN_CLOSE_WRITE); 509 if (wfd < 0) { 510 fprintf(stderr, "inotify_add_watch(%s): %s\n", traces_path, strerror(errno)); 511 goto error_close_ifd; 512 } 513 514 struct dirent *d; 515 int dalvik_found = 0; 516 while ((d = readdir(proc))) { 517 int pid = atoi(d->d_name); 518 if (pid <= 0) continue; 519 520 char path[PATH_MAX]; 521 char data[PATH_MAX]; 522 snprintf(path, sizeof(path), "/proc/%d/exe", pid); 523 ssize_t len = readlink(path, data, sizeof(data) - 1); 524 if (len <= 0) { 525 continue; 526 } 527 data[len] = '\0'; 528 529 if (!strcmp(data, "/system/bin/app_process")) { 530 /* skip zygote -- it won't dump its stack anyway */ 531 snprintf(path, sizeof(path), "/proc/%d/cmdline", pid); 532 int fd = open(path, O_RDONLY); 533 len = read(fd, data, sizeof(data) - 1); 534 close(fd); 535 if (len <= 0) { 536 continue; 537 } 538 data[len] = '\0'; 539 if (!strcmp(data, "zygote")) { 540 continue; 541 } 542 543 ++dalvik_found; 544 if (kill(pid, SIGQUIT)) { 545 fprintf(stderr, "kill(%d, SIGQUIT): %s\n", pid, strerror(errno)); 546 continue; 547 } 548 549 /* wait for the writable-close notification from inotify */ 550 struct pollfd pfd = { ifd, POLLIN, 0 }; 551 int ret = poll(&pfd, 1, 200); /* 200 msec timeout */ 552 if (ret < 0) { 553 fprintf(stderr, "poll: %s\n", strerror(errno)); 554 } else if (ret == 0) { 555 fprintf(stderr, "warning: timed out dumping pid %d\n", pid); 556 } else { 557 struct inotify_event ie; 558 read(ifd, &ie, sizeof(ie)); 559 } 560 } else if (should_dump_native_traces(data)) { 561 /* dump native process if appropriate */ 562 if (lseek(fd, 0, SEEK_END) < 0) { 563 fprintf(stderr, "lseek: %s\n", strerror(errno)); 564 } else { 565 dump_backtrace_to_file(pid, fd); 566 } 567 } 568 } 569 570 if (dalvik_found == 0) { 571 fprintf(stderr, "Warning: no Dalvik processes found to dump stacks\n"); 572 } 573 574 static char dump_traces_path[PATH_MAX]; 575 strlcpy(dump_traces_path, traces_path, sizeof(dump_traces_path)); 576 strlcat(dump_traces_path, ".bugreport", sizeof(dump_traces_path)); 577 if (rename(traces_path, dump_traces_path)) { 578 fprintf(stderr, "rename(%s, %s): %s\n", traces_path, dump_traces_path, strerror(errno)); 579 goto error_close_ifd; 580 } 581 result = dump_traces_path; 582 583 /* replace the saved [ANR] traces.txt file */ 584 rename(anr_traces_path, traces_path); 585 586 error_close_ifd: 587 close(ifd); 588 error_close_fd: 589 close(fd); 590 return result; 591 } 592 593 void play_sound(const char* path) { 594 run_command(NULL, 5, "/system/bin/stagefright", "-o", "-a", path, NULL); 595 } 596
