utils.cpp revision ad5f6c475934ac6a658a203069a9f055540946e7
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> 27#include <string.h> 28#include <sys/inotify.h> 29#include <sys/stat.h> 30#include <sys/time.h> 31#include <sys/wait.h> 32#include <sys/klog.h> 33#include <time.h> 34#include <unistd.h> 35#include <vector> 36#include <sys/prctl.h> 37 38#define LOG_TAG "dumpstate" 39#include <cutils/debugger.h> 40#include <cutils/log.h> 41#include <cutils/properties.h> 42#include <cutils/sockets.h> 43#include <private/android_filesystem_config.h> 44 45#include <selinux/android.h> 46 47#include "dumpstate.h" 48 49static const int64_t NANOS_PER_SEC = 1000000000; 50 51/* list of native processes to include in the native dumps */ 52static const char* native_processes_to_dump[] = { 53 "/system/bin/drmserver", 54 "/system/bin/mediaserver", 55 "/system/bin/sdcard", 56 "/system/bin/surfaceflinger", 57 "/system/bin/vehicle_network_service", 58 NULL, 59}; 60 61static uint64_t nanotime() { 62 struct timespec ts; 63 clock_gettime(CLOCK_MONOTONIC, &ts); 64 return (uint64_t)ts.tv_sec * NANOS_PER_SEC + ts.tv_nsec; 65} 66 67void for_each_userid(void (*func)(int), const char *header) { 68 ON_DRY_RUN_RETURN(); 69 DIR *d; 70 struct dirent *de; 71 72 if (header) printf("\n------ %s ------\n", header); 73 func(0); 74 75 if (!(d = opendir("/data/system/users"))) { 76 printf("Failed to open /data/system/users (%s)\n", strerror(errno)); 77 return; 78 } 79 80 while ((de = readdir(d))) { 81 int userid; 82 if (de->d_type != DT_DIR || !(userid = atoi(de->d_name))) { 83 continue; 84 } 85 func(userid); 86 } 87 88 closedir(d); 89} 90 91static void __for_each_pid(void (*helper)(int, const char *, void *), const char *header, void *arg) { 92 DIR *d; 93 struct dirent *de; 94 95 if (!(d = opendir("/proc"))) { 96 printf("Failed to open /proc (%s)\n", strerror(errno)); 97 return; 98 } 99 100 printf("\n------ %s ------\n", header); 101 while ((de = readdir(d))) { 102 int pid; 103 int fd; 104 char cmdpath[255]; 105 char cmdline[255]; 106 107 if (!(pid = atoi(de->d_name))) { 108 continue; 109 } 110 111 sprintf(cmdpath,"/proc/%d/cmdline", pid); 112 memset(cmdline, 0, sizeof(cmdline)); 113 if ((fd = TEMP_FAILURE_RETRY(open(cmdpath, O_RDONLY | O_CLOEXEC))) < 0) { 114 strcpy(cmdline, "N/A"); 115 } else { 116 read(fd, cmdline, sizeof(cmdline) - 1); 117 close(fd); 118 } 119 helper(pid, cmdline, arg); 120 } 121 122 closedir(d); 123} 124 125static void for_each_pid_helper(int pid, const char *cmdline, void *arg) { 126 for_each_pid_func *func = (for_each_pid_func*) arg; 127 func(pid, cmdline); 128} 129 130void for_each_pid(for_each_pid_func func, const char *header) { 131 ON_DRY_RUN_RETURN(); 132 __for_each_pid(for_each_pid_helper, header, (void *)func); 133} 134 135static void for_each_tid_helper(int pid, const char *cmdline, void *arg) { 136 DIR *d; 137 struct dirent *de; 138 char taskpath[255]; 139 for_each_tid_func *func = (for_each_tid_func *) arg; 140 141 sprintf(taskpath, "/proc/%d/task", pid); 142 143 if (!(d = opendir(taskpath))) { 144 printf("Failed to open %s (%s)\n", taskpath, strerror(errno)); 145 return; 146 } 147 148 func(pid, pid, cmdline); 149 150 while ((de = readdir(d))) { 151 int tid; 152 int fd; 153 char commpath[255]; 154 char comm[255]; 155 156 if (!(tid = atoi(de->d_name))) { 157 continue; 158 } 159 160 if (tid == pid) 161 continue; 162 163 sprintf(commpath,"/proc/%d/comm", tid); 164 memset(comm, 0, sizeof(comm)); 165 if ((fd = TEMP_FAILURE_RETRY(open(commpath, O_RDONLY | O_CLOEXEC))) < 0) { 166 strcpy(comm, "N/A"); 167 } else { 168 char *c; 169 read(fd, comm, sizeof(comm) - 1); 170 close(fd); 171 172 c = strrchr(comm, '\n'); 173 if (c) { 174 *c = '\0'; 175 } 176 } 177 func(pid, tid, comm); 178 } 179 180 closedir(d); 181} 182 183void for_each_tid(for_each_tid_func func, const char *header) { 184 ON_DRY_RUN_RETURN(); 185 __for_each_pid(for_each_tid_helper, header, (void *) func); 186} 187 188void show_wchan(int pid, int tid, const char *name) { 189 ON_DRY_RUN_RETURN(); 190 char path[255]; 191 char buffer[255]; 192 int fd; 193 char name_buffer[255]; 194 195 memset(buffer, 0, sizeof(buffer)); 196 197 sprintf(path, "/proc/%d/wchan", tid); 198 if ((fd = TEMP_FAILURE_RETRY(open(path, O_RDONLY | O_CLOEXEC))) < 0) { 199 printf("Failed to open '%s' (%s)\n", path, strerror(errno)); 200 return; 201 } 202 203 if (read(fd, buffer, sizeof(buffer)) < 0) { 204 printf("Failed to read '%s' (%s)\n", path, strerror(errno)); 205 goto out_close; 206 } 207 208 snprintf(name_buffer, sizeof(name_buffer), "%*s%s", 209 pid == tid ? 0 : 3, "", name); 210 211 printf("%-7d %-32s %s\n", tid, name_buffer, buffer); 212 213out_close: 214 close(fd); 215 return; 216} 217 218void do_dmesg() { 219 printf("------ KERNEL LOG (dmesg) ------\n"); 220 ON_DRY_RUN_RETURN(); 221 /* Get size of kernel buffer */ 222 int size = klogctl(KLOG_SIZE_BUFFER, NULL, 0); 223 if (size <= 0) { 224 printf("Unexpected klogctl return value: %d\n\n", size); 225 return; 226 } 227 char *buf = (char *) malloc(size + 1); 228 if (buf == NULL) { 229 printf("memory allocation failed\n\n"); 230 return; 231 } 232 int retval = klogctl(KLOG_READ_ALL, buf, size); 233 if (retval < 0) { 234 printf("klogctl failure\n\n"); 235 free(buf); 236 return; 237 } 238 buf[retval] = '\0'; 239 printf("%s\n\n", buf); 240 free(buf); 241 return; 242} 243 244void do_showmap(int pid, const char *name) { 245 char title[255]; 246 char arg[255]; 247 248 sprintf(title, "SHOW MAP %d (%s)", pid, name); 249 sprintf(arg, "%d", pid); 250 run_command(title, 10, SU_PATH, "root", "showmap", arg, NULL); 251} 252 253static int _dump_file_from_fd(const char *title, const char *path, int fd) { 254 if (title) { 255 printf("------ %s (%s", title, path); 256 257 struct stat st; 258 // Only show the modification time of non-device files. 259 size_t path_len = strlen(path); 260 if ((path_len < 6 || memcmp(path, "/proc/", 6)) && 261 (path_len < 5 || memcmp(path, "/sys/", 5)) && 262 (path_len < 3 || memcmp(path, "/d/", 3)) && 263 !fstat(fd, &st)) { 264 char stamp[80]; 265 time_t mtime = st.st_mtime; 266 strftime(stamp, sizeof(stamp), "%Y-%m-%d %H:%M:%S", localtime(&mtime)); 267 printf(": %s", stamp); 268 } 269 printf(") ------\n"); 270 } 271 ON_DRY_RUN({ update_progress(WEIGHT_FILE); close(fd); return 0; }); 272 273 bool newline = false; 274 fd_set read_set; 275 struct timeval tm; 276 while (1) { 277 FD_ZERO(&read_set); 278 FD_SET(fd, &read_set); 279 /* Timeout if no data is read for 30 seconds. */ 280 tm.tv_sec = 30; 281 tm.tv_usec = 0; 282 uint64_t elapsed = nanotime(); 283 int ret = TEMP_FAILURE_RETRY(select(fd + 1, &read_set, NULL, NULL, &tm)); 284 if (ret == -1) { 285 printf("*** %s: select failed: %s\n", path, strerror(errno)); 286 newline = true; 287 break; 288 } else if (ret == 0) { 289 elapsed = nanotime() - elapsed; 290 printf("*** %s: Timed out after %.3fs\n", path, 291 (float) elapsed / NANOS_PER_SEC); 292 newline = true; 293 break; 294 } else { 295 char buffer[65536]; 296 ssize_t bytes_read = TEMP_FAILURE_RETRY(read(fd, buffer, sizeof(buffer))); 297 if (bytes_read > 0) { 298 fwrite(buffer, bytes_read, 1, stdout); 299 newline = (buffer[bytes_read-1] == '\n'); 300 } else { 301 if (bytes_read == -1) { 302 printf("*** %s: Failed to read from fd: %s", path, strerror(errno)); 303 newline = true; 304 } 305 break; 306 } 307 } 308 } 309 update_progress(WEIGHT_FILE); 310 close(fd); 311 312 if (!newline) printf("\n"); 313 if (title) printf("\n"); 314 return 0; 315} 316 317/* prints the contents of a file */ 318int dump_file(const char *title, const char *path) { 319 int fd = TEMP_FAILURE_RETRY(open(path, O_RDONLY | O_NONBLOCK | O_CLOEXEC)); 320 if (fd < 0) { 321 int err = errno; 322 printf("*** %s: %s\n", path, strerror(err)); 323 if (title) printf("\n"); 324 return -1; 325 } 326 return _dump_file_from_fd(title, path, fd); 327} 328 329/* calls skip to gate calling dump_from_fd recursively 330 * in the specified directory. dump_from_fd defaults to 331 * dump_file_from_fd above when set to NULL. skip defaults 332 * to false when set to NULL. dump_from_fd will always be 333 * called with title NULL. 334 */ 335int dump_files(const char *title, const char *dir, 336 bool (*skip)(const char *path), 337 int (*dump_from_fd)(const char *title, const char *path, int fd)) { 338 DIR *dirp; 339 struct dirent *d; 340 char *newpath = NULL; 341 const char *slash = "/"; 342 int fd, retval = 0; 343 344 if (title) { 345 printf("------ %s (%s) ------\n", title, dir); 346 } 347 ON_DRY_RUN_RETURN(0); 348 349 if (dir[strlen(dir) - 1] == '/') { 350 ++slash; 351 } 352 dirp = opendir(dir); 353 if (dirp == NULL) { 354 retval = -errno; 355 fprintf(stderr, "%s: %s\n", dir, strerror(errno)); 356 return retval; 357 } 358 359 if (!dump_from_fd) { 360 dump_from_fd = dump_file_from_fd; 361 } 362 for (; ((d = readdir(dirp))); free(newpath), newpath = NULL) { 363 if ((d->d_name[0] == '.') 364 && (((d->d_name[1] == '.') && (d->d_name[2] == '\0')) 365 || (d->d_name[1] == '\0'))) { 366 continue; 367 } 368 asprintf(&newpath, "%s%s%s%s", dir, slash, d->d_name, 369 (d->d_type == DT_DIR) ? "/" : ""); 370 if (!newpath) { 371 retval = -errno; 372 continue; 373 } 374 if (skip && (*skip)(newpath)) { 375 continue; 376 } 377 if (d->d_type == DT_DIR) { 378 int ret = dump_files(NULL, newpath, skip, dump_from_fd); 379 if (ret < 0) { 380 retval = ret; 381 } 382 continue; 383 } 384 fd = TEMP_FAILURE_RETRY(open(newpath, O_RDONLY | O_NONBLOCK | O_CLOEXEC)); 385 if (fd < 0) { 386 retval = fd; 387 printf("*** %s: %s\n", newpath, strerror(errno)); 388 continue; 389 } 390 (*dump_from_fd)(NULL, newpath, fd); 391 } 392 closedir(dirp); 393 if (title) { 394 printf("\n"); 395 } 396 return retval; 397} 398 399/* fd must have been opened with the flag O_NONBLOCK. With this flag set, 400 * it's possible to avoid issues where opening the file itself can get 401 * stuck. 402 */ 403int dump_file_from_fd(const char *title, const char *path, int fd) { 404 int flags = fcntl(fd, F_GETFL); 405 if (flags == -1) { 406 printf("*** %s: failed to get flags on fd %d: %s\n", path, fd, strerror(errno)); 407 close(fd); 408 return -1; 409 } else if (!(flags & O_NONBLOCK)) { 410 printf("*** %s: fd must have O_NONBLOCK set.\n", path); 411 close(fd); 412 return -1; 413 } 414 return _dump_file_from_fd(title, path, fd); 415} 416 417bool waitpid_with_timeout(pid_t pid, int timeout_seconds, int* status) { 418 sigset_t child_mask, old_mask; 419 sigemptyset(&child_mask); 420 sigaddset(&child_mask, SIGCHLD); 421 422 if (sigprocmask(SIG_BLOCK, &child_mask, &old_mask) == -1) { 423 printf("*** sigprocmask failed: %s\n", strerror(errno)); 424 return false; 425 } 426 427 struct timespec ts; 428 ts.tv_sec = timeout_seconds; 429 ts.tv_nsec = 0; 430 int ret = TEMP_FAILURE_RETRY(sigtimedwait(&child_mask, NULL, &ts)); 431 int saved_errno = errno; 432 // Set the signals back the way they were. 433 if (sigprocmask(SIG_SETMASK, &old_mask, NULL) == -1) { 434 printf("*** sigprocmask failed: %s\n", strerror(errno)); 435 if (ret == 0) { 436 return false; 437 } 438 } 439 if (ret == -1) { 440 errno = saved_errno; 441 if (errno == EAGAIN) { 442 errno = ETIMEDOUT; 443 } else { 444 printf("*** sigtimedwait failed: %s\n", strerror(errno)); 445 } 446 return false; 447 } 448 449 pid_t child_pid = waitpid(pid, status, WNOHANG); 450 if (child_pid != pid) { 451 if (child_pid != -1) { 452 printf("*** Waiting for pid %d, got pid %d instead\n", pid, child_pid); 453 } else { 454 printf("*** waitpid failed: %s\n", strerror(errno)); 455 } 456 return false; 457 } 458 return true; 459} 460 461int run_command(const char *title, int timeout_seconds, const char *command, ...) { 462 fflush(stdout); 463 464 const char *args[1024] = {command}; 465 size_t arg; 466 va_list ap; 467 va_start(ap, command); 468 if (title) printf("------ %s (%s", title, command); 469 for (arg = 1; arg < sizeof(args) / sizeof(args[0]); ++arg) { 470 args[arg] = va_arg(ap, const char *); 471 if (args[arg] == NULL) break; 472 if (title) printf(" %s", args[arg]); 473 } 474 if (title) printf(") ------\n"); 475 fflush(stdout); 476 477 ON_DRY_RUN({ update_progress(timeout_seconds); va_end(ap); return 0; }); 478 479 int status = run_command_always(title, timeout_seconds, args); 480 va_end(ap); 481 return status; 482} 483 484/* forks a command and waits for it to finish */ 485int run_command_always(const char *title, int timeout_seconds, const char *args[]) { 486 /* TODO: for now we're simplifying the progress calculation by using the timeout as the weight. 487 * It's a good approximation for most cases, except when calling dumpsys, where its weight 488 * should be much higher proportionally to its timeout. */ 489 int weight = timeout_seconds; 490 491 const char *command = args[0]; 492 uint64_t start = nanotime(); 493 pid_t pid = fork(); 494 495 /* handle error case */ 496 if (pid < 0) { 497 printf("*** fork: %s\n", strerror(errno)); 498 return pid; 499 } 500 501 /* handle child case */ 502 if (pid == 0) { 503 504 /* make sure the child dies when dumpstate dies */ 505 prctl(PR_SET_PDEATHSIG, SIGKILL); 506 507 /* just ignore SIGPIPE, will go down with parent's */ 508 struct sigaction sigact; 509 memset(&sigact, 0, sizeof(sigact)); 510 sigact.sa_handler = SIG_IGN; 511 sigaction(SIGPIPE, &sigact, NULL); 512 513 execvp(command, (char**) args); 514 printf("*** exec(%s): %s\n", command, strerror(errno)); 515 fflush(stdout); 516 _exit(-1); 517 } 518 519 /* handle parent case */ 520 int status; 521 bool ret = waitpid_with_timeout(pid, timeout_seconds, &status); 522 uint64_t elapsed = nanotime() - start; 523 if (!ret) { 524 if (errno == ETIMEDOUT) { 525 printf("*** %s: Timed out after %.3fs (killing pid %d)\n", command, 526 (float) elapsed / NANOS_PER_SEC, pid); 527 } else { 528 printf("*** %s: Error after %.4fs (killing pid %d)\n", command, 529 (float) elapsed / NANOS_PER_SEC, pid); 530 } 531 kill(pid, SIGTERM); 532 if (!waitpid_with_timeout(pid, 5, NULL)) { 533 kill(pid, SIGKILL); 534 if (!waitpid_with_timeout(pid, 5, NULL)) { 535 printf("*** %s: Cannot kill %d even with SIGKILL.\n", command, pid); 536 } 537 } 538 return -1; 539 } 540 541 if (WIFSIGNALED(status)) { 542 printf("*** %s: Killed by signal %d\n", command, WTERMSIG(status)); 543 } else if (WIFEXITED(status) && WEXITSTATUS(status) > 0) { 544 printf("*** %s: Exit code %d\n", command, WEXITSTATUS(status)); 545 } 546 if (title) printf("[%s: %.3fs elapsed]\n\n", command, (float)elapsed / NANOS_PER_SEC); 547 548 if (weight > 0) { 549 update_progress(weight); 550 } 551 return status; 552} 553 554void send_broadcast(const std::string& action, const std::vector<std::string>& args) { 555 if (args.size() > 1000) { 556 fprintf(stderr, "send_broadcast: too many arguments (%d)\n", (int) args.size()); 557 return; 558 } 559 const char *am_args[1024] = { "/system/bin/am", "broadcast", "--user", "0", 560 "-a", action.c_str() }; 561 size_t am_index = 5; // Starts at the index of last initial value above. 562 for (const std::string& arg : args) { 563 am_args[++am_index] = arg.c_str(); 564 } 565 // Always terminate with NULL. 566 am_args[am_index + 1] = NULL; 567 run_command_always(NULL, 5, am_args); 568} 569 570size_t num_props = 0; 571static char* props[2000]; 572 573static void print_prop(const char *key, const char *name, void *user) { 574 (void) user; 575 if (num_props < sizeof(props) / sizeof(props[0])) { 576 char buf[PROPERTY_KEY_MAX + PROPERTY_VALUE_MAX + 10]; 577 snprintf(buf, sizeof(buf), "[%s]: [%s]\n", key, name); 578 props[num_props++] = strdup(buf); 579 } 580} 581 582static int compare_prop(const void *a, const void *b) { 583 return strcmp(*(char * const *) a, *(char * const *) b); 584} 585 586/* prints all the system properties */ 587void print_properties() { 588 printf("------ SYSTEM PROPERTIES ------\n"); 589 ON_DRY_RUN_RETURN(); 590 size_t i; 591 num_props = 0; 592 property_list(print_prop, NULL); 593 qsort(&props, num_props, sizeof(props[0]), compare_prop); 594 595 for (i = 0; i < num_props; ++i) { 596 fputs(props[i], stdout); 597 free(props[i]); 598 } 599 printf("\n"); 600} 601 602/* redirect output to a service control socket */ 603void redirect_to_socket(FILE *redirect, const char *service) { 604 int s = android_get_control_socket(service); 605 if (s < 0) { 606 fprintf(stderr, "android_get_control_socket(%s): %s\n", service, strerror(errno)); 607 exit(1); 608 } 609 fcntl(s, F_SETFD, FD_CLOEXEC); 610 if (listen(s, 4) < 0) { 611 fprintf(stderr, "listen(control socket): %s\n", strerror(errno)); 612 exit(1); 613 } 614 615 struct sockaddr addr; 616 socklen_t alen = sizeof(addr); 617 int fd = accept(s, &addr, &alen); 618 if (fd < 0) { 619 fprintf(stderr, "accept(control socket): %s\n", strerror(errno)); 620 exit(1); 621 } 622 623 fflush(redirect); 624 dup2(fd, fileno(redirect)); 625 close(fd); 626} 627 628/* redirect output to a file */ 629void redirect_to_file(FILE *redirect, char *path) { 630 char *chp = path; 631 632 /* skip initial slash */ 633 if (chp[0] == '/') 634 chp++; 635 636 /* create leading directories, if necessary */ 637 while (chp && chp[0]) { 638 chp = strchr(chp, '/'); 639 if (chp) { 640 *chp = 0; 641 mkdir(path, 0770); /* drwxrwx--- */ 642 *chp++ = '/'; 643 } 644 } 645 646 int fd = TEMP_FAILURE_RETRY(open(path, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 647 S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)); 648 if (fd < 0) { 649 fprintf(stderr, "%s: %s\n", path, strerror(errno)); 650 exit(1); 651 } 652 653 TEMP_FAILURE_RETRY(dup2(fd, fileno(redirect))); 654 close(fd); 655} 656 657static bool should_dump_native_traces(const char* path) { 658 for (const char** p = native_processes_to_dump; *p; p++) { 659 if (!strcmp(*p, path)) { 660 return true; 661 } 662 } 663 return false; 664} 665 666/* dump Dalvik and native stack traces, return the trace file location (NULL if none) */ 667const char *dump_traces() { 668 ON_DRY_RUN_RETURN(NULL); 669 const char* result = NULL; 670 671 char traces_path[PROPERTY_VALUE_MAX] = ""; 672 property_get("dalvik.vm.stack-trace-file", traces_path, ""); 673 if (!traces_path[0]) return NULL; 674 675 /* move the old traces.txt (if any) out of the way temporarily */ 676 char anr_traces_path[PATH_MAX]; 677 strlcpy(anr_traces_path, traces_path, sizeof(anr_traces_path)); 678 strlcat(anr_traces_path, ".anr", sizeof(anr_traces_path)); 679 if (rename(traces_path, anr_traces_path) && errno != ENOENT) { 680 fprintf(stderr, "rename(%s, %s): %s\n", traces_path, anr_traces_path, strerror(errno)); 681 return NULL; // Can't rename old traces.txt -- no permission? -- leave it alone instead 682 } 683 684 /* create a new, empty traces.txt file to receive stack dumps */ 685 int fd = TEMP_FAILURE_RETRY(open(traces_path, O_CREAT | O_WRONLY | O_TRUNC | O_NOFOLLOW | O_CLOEXEC, 686 0666)); /* -rw-rw-rw- */ 687 if (fd < 0) { 688 fprintf(stderr, "%s: %s\n", traces_path, strerror(errno)); 689 return NULL; 690 } 691 int chmod_ret = fchmod(fd, 0666); 692 if (chmod_ret < 0) { 693 fprintf(stderr, "fchmod on %s failed: %s\n", traces_path, strerror(errno)); 694 close(fd); 695 return NULL; 696 } 697 698 /* Variables below must be initialized before 'goto' statements */ 699 int dalvik_found = 0; 700 int ifd, wfd = -1; 701 702 /* walk /proc and kill -QUIT all Dalvik processes */ 703 DIR *proc = opendir("/proc"); 704 if (proc == NULL) { 705 fprintf(stderr, "/proc: %s\n", strerror(errno)); 706 goto error_close_fd; 707 } 708 709 /* use inotify to find when processes are done dumping */ 710 ifd = inotify_init(); 711 if (ifd < 0) { 712 fprintf(stderr, "inotify_init: %s\n", strerror(errno)); 713 goto error_close_fd; 714 } 715 716 wfd = inotify_add_watch(ifd, traces_path, IN_CLOSE_WRITE); 717 if (wfd < 0) { 718 fprintf(stderr, "inotify_add_watch(%s): %s\n", traces_path, strerror(errno)); 719 goto error_close_ifd; 720 } 721 722 struct dirent *d; 723 while ((d = readdir(proc))) { 724 int pid = atoi(d->d_name); 725 if (pid <= 0) continue; 726 727 char path[PATH_MAX]; 728 char data[PATH_MAX]; 729 snprintf(path, sizeof(path), "/proc/%d/exe", pid); 730 ssize_t len = readlink(path, data, sizeof(data) - 1); 731 if (len <= 0) { 732 continue; 733 } 734 data[len] = '\0'; 735 736 if (!strncmp(data, "/system/bin/app_process", strlen("/system/bin/app_process"))) { 737 /* skip zygote -- it won't dump its stack anyway */ 738 snprintf(path, sizeof(path), "/proc/%d/cmdline", pid); 739 int cfd = TEMP_FAILURE_RETRY(open(path, O_RDONLY | O_CLOEXEC)); 740 len = read(cfd, data, sizeof(data) - 1); 741 close(cfd); 742 if (len <= 0) { 743 continue; 744 } 745 data[len] = '\0'; 746 if (!strncmp(data, "zygote", strlen("zygote"))) { 747 continue; 748 } 749 750 ++dalvik_found; 751 uint64_t start = nanotime(); 752 if (kill(pid, SIGQUIT)) { 753 fprintf(stderr, "kill(%d, SIGQUIT): %s\n", pid, strerror(errno)); 754 continue; 755 } 756 757 /* wait for the writable-close notification from inotify */ 758 struct pollfd pfd = { ifd, POLLIN, 0 }; 759 int ret = poll(&pfd, 1, 5000); /* 5 sec timeout */ 760 if (ret < 0) { 761 fprintf(stderr, "poll: %s\n", strerror(errno)); 762 } else if (ret == 0) { 763 fprintf(stderr, "warning: timed out dumping pid %d\n", pid); 764 } else { 765 struct inotify_event ie; 766 read(ifd, &ie, sizeof(ie)); 767 } 768 769 if (lseek(fd, 0, SEEK_END) < 0) { 770 fprintf(stderr, "lseek: %s\n", strerror(errno)); 771 } else { 772 dprintf(fd, "[dump dalvik stack %d: %.3fs elapsed]\n", 773 pid, (float)(nanotime() - start) / NANOS_PER_SEC); 774 } 775 } else if (should_dump_native_traces(data)) { 776 /* dump native process if appropriate */ 777 if (lseek(fd, 0, SEEK_END) < 0) { 778 fprintf(stderr, "lseek: %s\n", strerror(errno)); 779 } else { 780 static uint16_t timeout_failures = 0; 781 uint64_t start = nanotime(); 782 783 /* If 3 backtrace dumps fail in a row, consider debuggerd dead. */ 784 if (timeout_failures == 3) { 785 dprintf(fd, "too many stack dump failures, skipping...\n"); 786 } else if (dump_backtrace_to_file_timeout(pid, fd, 20) == -1) { 787 dprintf(fd, "dumping failed, likely due to a timeout\n"); 788 timeout_failures++; 789 } else { 790 timeout_failures = 0; 791 } 792 dprintf(fd, "[dump native stack %d: %.3fs elapsed]\n", 793 pid, (float)(nanotime() - start) / NANOS_PER_SEC); 794 } 795 } 796 } 797 798 if (dalvik_found == 0) { 799 fprintf(stderr, "Warning: no Dalvik processes found to dump stacks\n"); 800 } 801 802 static char dump_traces_path[PATH_MAX]; 803 strlcpy(dump_traces_path, traces_path, sizeof(dump_traces_path)); 804 strlcat(dump_traces_path, ".bugreport", sizeof(dump_traces_path)); 805 if (rename(traces_path, dump_traces_path)) { 806 fprintf(stderr, "rename(%s, %s): %s\n", traces_path, dump_traces_path, strerror(errno)); 807 goto error_close_ifd; 808 } 809 result = dump_traces_path; 810 811 /* replace the saved [ANR] traces.txt file */ 812 rename(anr_traces_path, traces_path); 813 814error_close_ifd: 815 close(ifd); 816error_close_fd: 817 close(fd); 818 return result; 819} 820 821void dump_route_tables() { 822 ON_DRY_RUN_RETURN(); 823 const char* const RT_TABLES_PATH = "/data/misc/net/rt_tables"; 824 dump_file("RT_TABLES", RT_TABLES_PATH); 825 FILE* fp = fopen(RT_TABLES_PATH, "re"); 826 if (!fp) { 827 printf("*** %s: %s\n", RT_TABLES_PATH, strerror(errno)); 828 return; 829 } 830 char table[16]; 831 // Each line has an integer (the table number), a space, and a string (the table name). We only 832 // need the table number. It's a 32-bit unsigned number, so max 10 chars. Skip the table name. 833 // Add a fixed max limit so this doesn't go awry. 834 for (int i = 0; i < 64 && fscanf(fp, " %10s %*s", table) == 1; ++i) { 835 run_command("ROUTE TABLE IPv4", 10, "ip", "-4", "route", "show", "table", table, NULL); 836 run_command("ROUTE TABLE IPv6", 10, "ip", "-6", "route", "show", "table", table, NULL); 837 } 838 fclose(fp); 839} 840 841/* overall progress */ 842int progress = 0; 843int do_update_progress = 0; // Set by dumpstate.cpp 844int weight_total = WEIGHT_TOTAL; 845 846// TODO: make this function thread safe if sections are generated in parallel. 847void update_progress(int delta) { 848 if (!do_update_progress) return; 849 850 progress += delta; 851 852 char key[PROPERTY_KEY_MAX]; 853 char value[PROPERTY_VALUE_MAX]; 854 855 // adjusts max on the fly 856 if (progress > weight_total) { 857 int new_total = weight_total * 1.2; 858 fprintf(stderr, "Adjusting total weight from %d to %d\n", weight_total, new_total); 859 weight_total = new_total; 860 sprintf(key, "dumpstate.%d.max", getpid()); 861 sprintf(value, "%d", weight_total); 862 int status = property_set(key, value); 863 if (status) { 864 ALOGW("Could not update max weight by setting system property %s to %s: %d\n", 865 key, value, status); 866 } 867 } 868 869 sprintf(key, "dumpstate.%d.progress", getpid()); 870 sprintf(value, "%d", progress); 871 872 // stderr is ignored on normal invocations, but useful when calling /system/bin/dumpstate 873 // directly for debuggging. 874 fprintf(stderr, "Setting progress (%s): %s/%d\n", key, value, weight_total); 875 876 int status = property_set(key, value); 877 if (status) { 878 ALOGW("Could not update progress by setting system property %s to %s: %d\n", 879 key, value, status); 880 } 881} 882