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 static const int64_t NANOS_PER_SEC = 1000000000; 46 47 /* list of native processes to include in the native dumps */ 48 static const char* native_processes_to_dump[] = { 49 "/system/bin/drmserver", 50 "/system/bin/mediaserver", 51 "/system/bin/sdcard", 52 "/system/bin/surfaceflinger", 53 NULL, 54 }; 55 56 static uint64_t nanotime() { 57 struct timespec ts; 58 clock_gettime(CLOCK_MONOTONIC, &ts); 59 return (uint64_t)ts.tv_sec * NANOS_PER_SEC + ts.tv_nsec; 60 } 61 62 void for_each_userid(void (*func)(int), const char *header) { 63 DIR *d; 64 struct dirent *de; 65 66 if (header) printf("\n------ %s ------\n", header); 67 func(0); 68 69 if (!(d = opendir("/data/system/users"))) { 70 printf("Failed to open /data/system/users (%s)\n", strerror(errno)); 71 return; 72 } 73 74 while ((de = readdir(d))) { 75 int userid; 76 if (de->d_type != DT_DIR || !(userid = atoi(de->d_name))) { 77 continue; 78 } 79 func(userid); 80 } 81 82 closedir(d); 83 } 84 85 static void __for_each_pid(void (*helper)(int, const char *, void *), const char *header, void *arg) { 86 DIR *d; 87 struct dirent *de; 88 89 if (!(d = opendir("/proc"))) { 90 printf("Failed to open /proc (%s)\n", strerror(errno)); 91 return; 92 } 93 94 printf("\n------ %s ------\n", header); 95 while ((de = readdir(d))) { 96 int pid; 97 int fd; 98 char cmdpath[255]; 99 char cmdline[255]; 100 101 if (!(pid = atoi(de->d_name))) { 102 continue; 103 } 104 105 sprintf(cmdpath,"/proc/%d/cmdline", pid); 106 memset(cmdline, 0, sizeof(cmdline)); 107 if ((fd = TEMP_FAILURE_RETRY(open(cmdpath, O_RDONLY | O_CLOEXEC))) < 0) { 108 strcpy(cmdline, "N/A"); 109 } else { 110 read(fd, cmdline, sizeof(cmdline) - 1); 111 close(fd); 112 } 113 helper(pid, cmdline, arg); 114 } 115 116 closedir(d); 117 } 118 119 static void for_each_pid_helper(int pid, const char *cmdline, void *arg) { 120 for_each_pid_func *func = arg; 121 func(pid, cmdline); 122 } 123 124 void for_each_pid(for_each_pid_func func, const char *header) { 125 __for_each_pid(for_each_pid_helper, header, func); 126 } 127 128 static void for_each_tid_helper(int pid, const char *cmdline, void *arg) { 129 DIR *d; 130 struct dirent *de; 131 char taskpath[255]; 132 for_each_tid_func *func = arg; 133 134 sprintf(taskpath, "/proc/%d/task", pid); 135 136 if (!(d = opendir(taskpath))) { 137 printf("Failed to open %s (%s)\n", taskpath, strerror(errno)); 138 return; 139 } 140 141 func(pid, pid, cmdline); 142 143 while ((de = readdir(d))) { 144 int tid; 145 int fd; 146 char commpath[255]; 147 char comm[255]; 148 149 if (!(tid = atoi(de->d_name))) { 150 continue; 151 } 152 153 if (tid == pid) 154 continue; 155 156 sprintf(commpath,"/proc/%d/comm", tid); 157 memset(comm, 0, sizeof(comm)); 158 if ((fd = TEMP_FAILURE_RETRY(open(commpath, O_RDONLY | O_CLOEXEC))) < 0) { 159 strcpy(comm, "N/A"); 160 } else { 161 char *c; 162 read(fd, comm, sizeof(comm) - 1); 163 close(fd); 164 165 c = strrchr(comm, '\n'); 166 if (c) { 167 *c = '\0'; 168 } 169 } 170 func(pid, tid, comm); 171 } 172 173 closedir(d); 174 } 175 176 void for_each_tid(for_each_tid_func func, const char *header) { 177 __for_each_pid(for_each_tid_helper, header, func); 178 } 179 180 void show_wchan(int pid, int tid, const char *name) { 181 char path[255]; 182 char buffer[255]; 183 int fd; 184 char name_buffer[255]; 185 186 memset(buffer, 0, sizeof(buffer)); 187 188 sprintf(path, "/proc/%d/wchan", tid); 189 if ((fd = TEMP_FAILURE_RETRY(open(path, O_RDONLY | O_CLOEXEC))) < 0) { 190 printf("Failed to open '%s' (%s)\n", path, strerror(errno)); 191 return; 192 } 193 194 if (read(fd, buffer, sizeof(buffer)) < 0) { 195 printf("Failed to read '%s' (%s)\n", path, strerror(errno)); 196 goto out_close; 197 } 198 199 snprintf(name_buffer, sizeof(name_buffer), "%*s%s", 200 pid == tid ? 0 : 3, "", name); 201 202 printf("%-7d %-32s %s\n", tid, name_buffer, buffer); 203 204 out_close: 205 close(fd); 206 return; 207 } 208 209 void do_dmesg() { 210 printf("------ KERNEL LOG (dmesg) ------\n"); 211 /* Get size of kernel buffer */ 212 int size = klogctl(KLOG_SIZE_BUFFER, NULL, 0); 213 if (size <= 0) { 214 printf("Unexpected klogctl return value: %d\n\n", size); 215 return; 216 } 217 char *buf = (char *) malloc(size + 1); 218 if (buf == NULL) { 219 printf("memory allocation failed\n\n"); 220 return; 221 } 222 int retval = klogctl(KLOG_READ_ALL, buf, size); 223 if (retval < 0) { 224 printf("klogctl failure\n\n"); 225 free(buf); 226 return; 227 } 228 buf[retval] = '\0'; 229 printf("%s\n\n", buf); 230 free(buf); 231 return; 232 } 233 234 void do_showmap(int pid, const char *name) { 235 char title[255]; 236 char arg[255]; 237 238 sprintf(title, "SHOW MAP %d (%s)", pid, name); 239 sprintf(arg, "%d", pid); 240 run_command(title, 10, SU_PATH, "root", "showmap", arg, NULL); 241 } 242 243 static int _dump_file_from_fd(const char *title, const char *path, int fd) { 244 if (title) printf("------ %s (%s", title, path); 245 246 if (title) { 247 struct stat st; 248 if (memcmp(path, "/proc/", 6) && memcmp(path, "/sys/", 5) && !fstat(fd, &st)) { 249 char stamp[80]; 250 time_t mtime = st.st_mtime; 251 strftime(stamp, sizeof(stamp), "%Y-%m-%d %H:%M:%S", localtime(&mtime)); 252 printf(": %s", stamp); 253 } 254 printf(") ------\n"); 255 } 256 257 bool newline = false; 258 fd_set read_set; 259 struct timeval tm; 260 while (1) { 261 FD_ZERO(&read_set); 262 FD_SET(fd, &read_set); 263 /* Timeout if no data is read for 30 seconds. */ 264 tm.tv_sec = 30; 265 tm.tv_usec = 0; 266 uint64_t elapsed = nanotime(); 267 int ret = TEMP_FAILURE_RETRY(select(fd + 1, &read_set, NULL, NULL, &tm)); 268 if (ret == -1) { 269 printf("*** %s: select failed: %s\n", path, strerror(errno)); 270 newline = true; 271 break; 272 } else if (ret == 0) { 273 elapsed = nanotime() - elapsed; 274 printf("*** %s: Timed out after %.3fs\n", path, 275 (float) elapsed / NANOS_PER_SEC); 276 newline = true; 277 break; 278 } else { 279 char buffer[65536]; 280 ssize_t bytes_read = TEMP_FAILURE_RETRY(read(fd, buffer, sizeof(buffer))); 281 if (bytes_read > 0) { 282 fwrite(buffer, bytes_read, 1, stdout); 283 newline = (buffer[bytes_read-1] == '\n'); 284 } else { 285 if (bytes_read == -1) { 286 printf("*** %s: Failed to read from fd: %s", path, strerror(errno)); 287 newline = true; 288 } 289 break; 290 } 291 } 292 } 293 close(fd); 294 295 if (!newline) printf("\n"); 296 if (title) printf("\n"); 297 return 0; 298 } 299 300 /* prints the contents of a file */ 301 int dump_file(const char *title, const char *path) { 302 int fd = TEMP_FAILURE_RETRY(open(path, O_RDONLY | O_NONBLOCK | O_CLOEXEC)); 303 if (fd < 0) { 304 int err = errno; 305 if (title) printf("------ %s (%s) ------\n", title, path); 306 printf("*** %s: %s\n", path, strerror(err)); 307 if (title) printf("\n"); 308 return -1; 309 } 310 return _dump_file_from_fd(title, path, fd); 311 } 312 313 /* calls skip to gate calling dump_from_fd recursively 314 * in the specified directory. dump_from_fd defaults to 315 * dump_file_from_fd above when set to NULL. skip defaults 316 * to false when set to NULL. dump_from_fd will always be 317 * called with title NULL. 318 */ 319 int dump_files(const char *title, const char *dir, 320 bool (*skip)(const char *path), 321 int (*dump_from_fd)(const char *title, const char *path, int fd)) { 322 DIR *dirp; 323 struct dirent *d; 324 char *newpath = NULL; 325 char *slash = "/"; 326 int fd, retval = 0; 327 328 if (title) { 329 printf("------ %s (%s) ------\n", title, dir); 330 } 331 332 if (dir[strlen(dir) - 1] == '/') { 333 ++slash; 334 } 335 dirp = opendir(dir); 336 if (dirp == NULL) { 337 retval = -errno; 338 fprintf(stderr, "%s: %s\n", dir, strerror(errno)); 339 return retval; 340 } 341 342 if (!dump_from_fd) { 343 dump_from_fd = dump_file_from_fd; 344 } 345 for (; ((d = readdir(dirp))); free(newpath), newpath = NULL) { 346 if ((d->d_name[0] == '.') 347 && (((d->d_name[1] == '.') && (d->d_name[2] == '\0')) 348 || (d->d_name[1] == '\0'))) { 349 continue; 350 } 351 asprintf(&newpath, "%s%s%s%s", dir, slash, d->d_name, 352 (d->d_type == DT_DIR) ? "/" : ""); 353 if (!newpath) { 354 retval = -errno; 355 continue; 356 } 357 if (skip && (*skip)(newpath)) { 358 continue; 359 } 360 if (d->d_type == DT_DIR) { 361 int ret = dump_files(NULL, newpath, skip, dump_from_fd); 362 if (ret < 0) { 363 retval = ret; 364 } 365 continue; 366 } 367 fd = TEMP_FAILURE_RETRY(open(newpath, O_RDONLY | O_NONBLOCK | O_CLOEXEC)); 368 if (fd < 0) { 369 retval = fd; 370 printf("*** %s: %s\n", newpath, strerror(errno)); 371 continue; 372 } 373 (*dump_from_fd)(NULL, newpath, fd); 374 } 375 closedir(dirp); 376 if (title) { 377 printf("\n"); 378 } 379 return retval; 380 } 381 382 /* fd must have been opened with the flag O_NONBLOCK. With this flag set, 383 * it's possible to avoid issues where opening the file itself can get 384 * stuck. 385 */ 386 int dump_file_from_fd(const char *title, const char *path, int fd) { 387 int flags = fcntl(fd, F_GETFL); 388 if (flags == -1) { 389 printf("*** %s: failed to get flags on fd %d: %s\n", path, fd, strerror(errno)); 390 return -1; 391 } else if (!(flags & O_NONBLOCK)) { 392 printf("*** %s: fd must have O_NONBLOCK set.\n", path); 393 return -1; 394 } 395 return _dump_file_from_fd(title, path, fd); 396 } 397 398 bool waitpid_with_timeout(pid_t pid, int timeout_seconds, int* status) { 399 sigset_t child_mask, old_mask; 400 sigemptyset(&child_mask); 401 sigaddset(&child_mask, SIGCHLD); 402 403 if (sigprocmask(SIG_BLOCK, &child_mask, &old_mask) == -1) { 404 printf("*** sigprocmask failed: %s\n", strerror(errno)); 405 return false; 406 } 407 408 struct timespec ts; 409 ts.tv_sec = timeout_seconds; 410 ts.tv_nsec = 0; 411 int ret = TEMP_FAILURE_RETRY(sigtimedwait(&child_mask, NULL, &ts)); 412 int saved_errno = errno; 413 // Set the signals back the way they were. 414 if (sigprocmask(SIG_SETMASK, &old_mask, NULL) == -1) { 415 printf("*** sigprocmask failed: %s\n", strerror(errno)); 416 if (ret == 0) { 417 return false; 418 } 419 } 420 if (ret == -1) { 421 errno = saved_errno; 422 if (errno == EAGAIN) { 423 errno = ETIMEDOUT; 424 } else { 425 printf("*** sigtimedwait failed: %s\n", strerror(errno)); 426 } 427 return false; 428 } 429 430 pid_t child_pid = waitpid(pid, status, WNOHANG); 431 if (child_pid != pid) { 432 if (child_pid != -1) { 433 printf("*** Waiting for pid %d, got pid %d instead\n", pid, child_pid); 434 } else { 435 printf("*** waitpid failed: %s\n", strerror(errno)); 436 } 437 return false; 438 } 439 return true; 440 } 441 442 /* forks a command and waits for it to finish */ 443 int run_command(const char *title, int timeout_seconds, const char *command, ...) { 444 fflush(stdout); 445 uint64_t start = nanotime(); 446 pid_t pid = fork(); 447 448 /* handle error case */ 449 if (pid < 0) { 450 printf("*** fork: %s\n", strerror(errno)); 451 return pid; 452 } 453 454 /* handle child case */ 455 if (pid == 0) { 456 const char *args[1024] = {command}; 457 size_t arg; 458 459 /* make sure the child dies when dumpstate dies */ 460 prctl(PR_SET_PDEATHSIG, SIGKILL); 461 462 /* just ignore SIGPIPE, will go down with parent's */ 463 struct sigaction sigact; 464 memset(&sigact, 0, sizeof(sigact)); 465 sigact.sa_handler = SIG_IGN; 466 sigaction(SIGPIPE, &sigact, NULL); 467 468 va_list ap; 469 va_start(ap, command); 470 if (title) printf("------ %s (%s", title, command); 471 for (arg = 1; arg < sizeof(args) / sizeof(args[0]); ++arg) { 472 args[arg] = va_arg(ap, const char *); 473 if (args[arg] == NULL) break; 474 if (title) printf(" %s", args[arg]); 475 } 476 if (title) printf(") ------\n"); 477 fflush(stdout); 478 479 execvp(command, (char**) args); 480 printf("*** exec(%s): %s\n", command, strerror(errno)); 481 fflush(stdout); 482 _exit(-1); 483 } 484 485 /* handle parent case */ 486 int status; 487 bool ret = waitpid_with_timeout(pid, timeout_seconds, &status); 488 uint64_t elapsed = nanotime() - start; 489 if (!ret) { 490 if (errno == ETIMEDOUT) { 491 printf("*** %s: Timed out after %.3fs (killing pid %d)\n", command, 492 (float) elapsed / NANOS_PER_SEC, pid); 493 } else { 494 printf("*** %s: Error after %.4fs (killing pid %d)\n", command, 495 (float) elapsed / NANOS_PER_SEC, pid); 496 } 497 kill(pid, SIGTERM); 498 if (!waitpid_with_timeout(pid, 5, NULL)) { 499 kill(pid, SIGKILL); 500 if (!waitpid_with_timeout(pid, 5, NULL)) { 501 printf("*** %s: Cannot kill %d even with SIGKILL.\n", command, pid); 502 } 503 } 504 return -1; 505 } 506 507 if (WIFSIGNALED(status)) { 508 printf("*** %s: Killed by signal %d\n", command, WTERMSIG(status)); 509 } else if (WIFEXITED(status) && WEXITSTATUS(status) > 0) { 510 printf("*** %s: Exit code %d\n", command, WEXITSTATUS(status)); 511 } 512 if (title) printf("[%s: %.3fs elapsed]\n\n", command, (float)elapsed / NANOS_PER_SEC); 513 514 return status; 515 } 516 517 size_t num_props = 0; 518 static char* props[2000]; 519 520 static void print_prop(const char *key, const char *name, void *user) { 521 (void) user; 522 if (num_props < sizeof(props) / sizeof(props[0])) { 523 char buf[PROPERTY_KEY_MAX + PROPERTY_VALUE_MAX + 10]; 524 snprintf(buf, sizeof(buf), "[%s]: [%s]\n", key, name); 525 props[num_props++] = strdup(buf); 526 } 527 } 528 529 static int compare_prop(const void *a, const void *b) { 530 return strcmp(*(char * const *) a, *(char * const *) b); 531 } 532 533 /* prints all the system properties */ 534 void print_properties() { 535 size_t i; 536 num_props = 0; 537 property_list(print_prop, NULL); 538 qsort(&props, num_props, sizeof(props[0]), compare_prop); 539 540 printf("------ SYSTEM PROPERTIES ------\n"); 541 for (i = 0; i < num_props; ++i) { 542 fputs(props[i], stdout); 543 free(props[i]); 544 } 545 printf("\n"); 546 } 547 548 /* redirect output to a service control socket */ 549 void redirect_to_socket(FILE *redirect, const char *service) { 550 int s = android_get_control_socket(service); 551 if (s < 0) { 552 fprintf(stderr, "android_get_control_socket(%s): %s\n", service, strerror(errno)); 553 exit(1); 554 } 555 fcntl(s, F_SETFD, FD_CLOEXEC); 556 if (listen(s, 4) < 0) { 557 fprintf(stderr, "listen(control socket): %s\n", strerror(errno)); 558 exit(1); 559 } 560 561 struct sockaddr addr; 562 socklen_t alen = sizeof(addr); 563 int fd = accept(s, &addr, &alen); 564 if (fd < 0) { 565 fprintf(stderr, "accept(control socket): %s\n", strerror(errno)); 566 exit(1); 567 } 568 569 fflush(redirect); 570 dup2(fd, fileno(redirect)); 571 close(fd); 572 } 573 574 /* redirect output to a file */ 575 void redirect_to_file(FILE *redirect, char *path) { 576 char *chp = path; 577 578 /* skip initial slash */ 579 if (chp[0] == '/') 580 chp++; 581 582 /* create leading directories, if necessary */ 583 while (chp && chp[0]) { 584 chp = strchr(chp, '/'); 585 if (chp) { 586 *chp = 0; 587 mkdir(path, 0770); /* drwxrwx--- */ 588 *chp++ = '/'; 589 } 590 } 591 592 int fd = TEMP_FAILURE_RETRY(open(path, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 593 S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)); 594 if (fd < 0) { 595 fprintf(stderr, "%s: %s\n", path, strerror(errno)); 596 exit(1); 597 } 598 599 TEMP_FAILURE_RETRY(dup2(fd, fileno(redirect))); 600 close(fd); 601 } 602 603 static bool should_dump_native_traces(const char* path) { 604 for (const char** p = native_processes_to_dump; *p; p++) { 605 if (!strcmp(*p, path)) { 606 return true; 607 } 608 } 609 return false; 610 } 611 612 /* dump Dalvik and native stack traces, return the trace file location (NULL if none) */ 613 const char *dump_traces() { 614 const char* result = NULL; 615 616 char traces_path[PROPERTY_VALUE_MAX] = ""; 617 property_get("dalvik.vm.stack-trace-file", traces_path, ""); 618 if (!traces_path[0]) return NULL; 619 620 /* move the old traces.txt (if any) out of the way temporarily */ 621 char anr_traces_path[PATH_MAX]; 622 strlcpy(anr_traces_path, traces_path, sizeof(anr_traces_path)); 623 strlcat(anr_traces_path, ".anr", sizeof(anr_traces_path)); 624 if (rename(traces_path, anr_traces_path) && errno != ENOENT) { 625 fprintf(stderr, "rename(%s, %s): %s\n", traces_path, anr_traces_path, strerror(errno)); 626 return NULL; // Can't rename old traces.txt -- no permission? -- leave it alone instead 627 } 628 629 /* make the directory if necessary */ 630 char anr_traces_dir[PATH_MAX]; 631 strlcpy(anr_traces_dir, traces_path, sizeof(anr_traces_dir)); 632 char *slash = strrchr(anr_traces_dir, '/'); 633 if (slash != NULL) { 634 *slash = '\0'; 635 if (!mkdir(anr_traces_dir, 0775)) { 636 chown(anr_traces_dir, AID_SYSTEM, AID_SYSTEM); 637 chmod(anr_traces_dir, 0775); 638 if (selinux_android_restorecon(anr_traces_dir, 0) == -1) { 639 fprintf(stderr, "restorecon failed for %s: %s\n", anr_traces_dir, strerror(errno)); 640 } 641 } else if (errno != EEXIST) { 642 fprintf(stderr, "mkdir(%s): %s\n", anr_traces_dir, strerror(errno)); 643 return NULL; 644 } 645 } 646 647 /* create a new, empty traces.txt file to receive stack dumps */ 648 int fd = TEMP_FAILURE_RETRY(open(traces_path, O_CREAT | O_WRONLY | O_TRUNC | O_NOFOLLOW | O_CLOEXEC, 649 0666)); /* -rw-rw-rw- */ 650 if (fd < 0) { 651 fprintf(stderr, "%s: %s\n", traces_path, strerror(errno)); 652 return NULL; 653 } 654 int chmod_ret = fchmod(fd, 0666); 655 if (chmod_ret < 0) { 656 fprintf(stderr, "fchmod on %s failed: %s\n", traces_path, strerror(errno)); 657 close(fd); 658 return NULL; 659 } 660 661 /* walk /proc and kill -QUIT all Dalvik processes */ 662 DIR *proc = opendir("/proc"); 663 if (proc == NULL) { 664 fprintf(stderr, "/proc: %s\n", strerror(errno)); 665 goto error_close_fd; 666 } 667 668 /* use inotify to find when processes are done dumping */ 669 int ifd = inotify_init(); 670 if (ifd < 0) { 671 fprintf(stderr, "inotify_init: %s\n", strerror(errno)); 672 goto error_close_fd; 673 } 674 675 int wfd = inotify_add_watch(ifd, traces_path, IN_CLOSE_WRITE); 676 if (wfd < 0) { 677 fprintf(stderr, "inotify_add_watch(%s): %s\n", traces_path, strerror(errno)); 678 goto error_close_ifd; 679 } 680 681 struct dirent *d; 682 int dalvik_found = 0; 683 while ((d = readdir(proc))) { 684 int pid = atoi(d->d_name); 685 if (pid <= 0) continue; 686 687 char path[PATH_MAX]; 688 char data[PATH_MAX]; 689 snprintf(path, sizeof(path), "/proc/%d/exe", pid); 690 ssize_t len = readlink(path, data, sizeof(data) - 1); 691 if (len <= 0) { 692 continue; 693 } 694 data[len] = '\0'; 695 696 if (!strncmp(data, "/system/bin/app_process", strlen("/system/bin/app_process"))) { 697 /* skip zygote -- it won't dump its stack anyway */ 698 snprintf(path, sizeof(path), "/proc/%d/cmdline", pid); 699 int cfd = TEMP_FAILURE_RETRY(open(path, O_RDONLY | O_CLOEXEC)); 700 len = read(cfd, data, sizeof(data) - 1); 701 close(cfd); 702 if (len <= 0) { 703 continue; 704 } 705 data[len] = '\0'; 706 if (!strncmp(data, "zygote", strlen("zygote"))) { 707 continue; 708 } 709 710 ++dalvik_found; 711 uint64_t start = nanotime(); 712 if (kill(pid, SIGQUIT)) { 713 fprintf(stderr, "kill(%d, SIGQUIT): %s\n", pid, strerror(errno)); 714 continue; 715 } 716 717 /* wait for the writable-close notification from inotify */ 718 struct pollfd pfd = { ifd, POLLIN, 0 }; 719 int ret = poll(&pfd, 1, 5000); /* 5 sec timeout */ 720 if (ret < 0) { 721 fprintf(stderr, "poll: %s\n", strerror(errno)); 722 } else if (ret == 0) { 723 fprintf(stderr, "warning: timed out dumping pid %d\n", pid); 724 } else { 725 struct inotify_event ie; 726 read(ifd, &ie, sizeof(ie)); 727 } 728 729 if (lseek(fd, 0, SEEK_END) < 0) { 730 fprintf(stderr, "lseek: %s\n", strerror(errno)); 731 } else { 732 dprintf(fd, "[dump dalvik stack %d: %.3fs elapsed]\n", 733 pid, (float)(nanotime() - start) / NANOS_PER_SEC); 734 } 735 } else if (should_dump_native_traces(data)) { 736 /* dump native process if appropriate */ 737 if (lseek(fd, 0, SEEK_END) < 0) { 738 fprintf(stderr, "lseek: %s\n", strerror(errno)); 739 } else { 740 static uint16_t timeout_failures = 0; 741 uint64_t start = nanotime(); 742 743 /* If 3 backtrace dumps fail in a row, consider debuggerd dead. */ 744 if (timeout_failures == 3) { 745 dprintf(fd, "too many stack dump failures, skipping...\n"); 746 } else if (dump_backtrace_to_file_timeout(pid, fd, 20) == -1) { 747 dprintf(fd, "dumping failed, likely due to a timeout\n"); 748 timeout_failures++; 749 } else { 750 timeout_failures = 0; 751 } 752 dprintf(fd, "[dump native stack %d: %.3fs elapsed]\n", 753 pid, (float)(nanotime() - start) / NANOS_PER_SEC); 754 } 755 } 756 } 757 758 if (dalvik_found == 0) { 759 fprintf(stderr, "Warning: no Dalvik processes found to dump stacks\n"); 760 } 761 762 static char dump_traces_path[PATH_MAX]; 763 strlcpy(dump_traces_path, traces_path, sizeof(dump_traces_path)); 764 strlcat(dump_traces_path, ".bugreport", sizeof(dump_traces_path)); 765 if (rename(traces_path, dump_traces_path)) { 766 fprintf(stderr, "rename(%s, %s): %s\n", traces_path, dump_traces_path, strerror(errno)); 767 goto error_close_ifd; 768 } 769 result = dump_traces_path; 770 771 /* replace the saved [ANR] traces.txt file */ 772 rename(anr_traces_path, traces_path); 773 774 error_close_ifd: 775 close(ifd); 776 error_close_fd: 777 close(fd); 778 return result; 779 } 780 781 void dump_route_tables() { 782 const char* const RT_TABLES_PATH = "/data/misc/net/rt_tables"; 783 dump_file("RT_TABLES", RT_TABLES_PATH); 784 FILE* fp = fopen(RT_TABLES_PATH, "re"); 785 if (!fp) { 786 printf("*** %s: %s\n", RT_TABLES_PATH, strerror(errno)); 787 return; 788 } 789 char table[16]; 790 // Each line has an integer (the table number), a space, and a string (the table name). We only 791 // need the table number. It's a 32-bit unsigned number, so max 10 chars. Skip the table name. 792 // Add a fixed max limit so this doesn't go awry. 793 for (int i = 0; i < 64 && fscanf(fp, " %10s %*s", table) == 1; ++i) { 794 run_command("ROUTE TABLE IPv4", 10, "ip", "-4", "route", "show", "table", table, NULL); 795 run_command("ROUTE TABLE IPv6", 10, "ip", "-6", "route", "show", "table", table, NULL); 796 } 797 fclose(fp); 798 } 799
