1 /* system/debuggerd/debuggerd.c 2 ** 3 ** Copyright 2006, The Android Open Source Project 4 ** 5 ** Licensed under the Apache License, Version 2.0 (the "License"); 6 ** you may not use this file except in compliance with the License. 7 ** You may obtain a copy of the License at 8 ** 9 ** http://www.apache.org/licenses/LICENSE-2.0 10 ** 11 ** Unless required by applicable law or agreed to in writing, software 12 ** distributed under the License is distributed on an "AS IS" BASIS, 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 ** See the License for the specific language governing permissions and 15 ** limitations under the License. 16 */ 17 18 #include <stdio.h> 19 #include <errno.h> 20 #include <signal.h> 21 #include <pthread.h> 22 #include <stdarg.h> 23 #include <fcntl.h> 24 #include <sys/types.h> 25 #include <dirent.h> 26 27 #include <sys/ptrace.h> 28 #include <sys/wait.h> 29 #include <sys/exec_elf.h> 30 #include <sys/stat.h> 31 32 #include <cutils/sockets.h> 33 #include <cutils/logd.h> 34 #include <cutils/properties.h> 35 36 #include <linux/input.h> 37 38 #include <private/android_filesystem_config.h> 39 40 #include "debuggerd.h" 41 #include "utility.h" 42 43 #define ANDROID_LOG_INFO 4 44 45 /* Log information onto the tombstone */ 46 void _LOG(int tfd, bool in_tombstone_only, const char *fmt, ...) 47 { 48 char buf[512]; 49 50 va_list ap; 51 va_start(ap, fmt); 52 53 if (tfd >= 0) { 54 int len; 55 vsnprintf(buf, sizeof(buf), fmt, ap); 56 len = strlen(buf); 57 if(tfd >= 0) write(tfd, buf, len); 58 } 59 60 if (!in_tombstone_only) 61 __android_log_vprint(ANDROID_LOG_INFO, "DEBUG", fmt, ap); 62 } 63 64 // 6f000000-6f01e000 rwxp 00000000 00:0c 16389419 /system/lib/libcomposer.so 65 // 012345678901234567890123456789012345678901234567890123456789 66 // 0 1 2 3 4 5 67 68 mapinfo *parse_maps_line(char *line) 69 { 70 mapinfo *mi; 71 int len = strlen(line); 72 73 if(len < 1) return 0; 74 line[--len] = 0; 75 76 if(len < 50) return 0; 77 if(line[20] != 'x') return 0; 78 79 mi = malloc(sizeof(mapinfo) + (len - 47)); 80 if(mi == 0) return 0; 81 82 mi->start = strtoul(line, 0, 16); 83 mi->end = strtoul(line + 9, 0, 16); 84 /* To be filled in parse_elf_info if the mapped section starts with 85 * elf_header 86 */ 87 mi->exidx_start = mi->exidx_end = 0; 88 mi->symbols = 0; 89 mi->next = 0; 90 strcpy(mi->name, line + 49); 91 92 return mi; 93 } 94 95 void dump_build_info(int tfd) 96 { 97 char fingerprint[PROPERTY_VALUE_MAX]; 98 99 property_get("ro.build.fingerprint", fingerprint, "unknown"); 100 101 _LOG(tfd, false, "Build fingerprint: '%s'\n", fingerprint); 102 } 103 104 const char *get_signame(int sig) 105 { 106 switch(sig) { 107 case SIGILL: return "SIGILL"; 108 case SIGABRT: return "SIGABRT"; 109 case SIGBUS: return "SIGBUS"; 110 case SIGFPE: return "SIGFPE"; 111 case SIGSEGV: return "SIGSEGV"; 112 case SIGSTKFLT: return "SIGSTKFLT"; 113 default: return "?"; 114 } 115 } 116 117 const char *get_sigcode(int signo, int code) 118 { 119 switch (signo) { 120 case SIGILL: 121 switch (code) { 122 case ILL_ILLOPC: return "ILL_ILLOPC"; 123 case ILL_ILLOPN: return "ILL_ILLOPN"; 124 case ILL_ILLADR: return "ILL_ILLADR"; 125 case ILL_ILLTRP: return "ILL_ILLTRP"; 126 case ILL_PRVOPC: return "ILL_PRVOPC"; 127 case ILL_PRVREG: return "ILL_PRVREG"; 128 case ILL_COPROC: return "ILL_COPROC"; 129 case ILL_BADSTK: return "ILL_BADSTK"; 130 } 131 break; 132 case SIGBUS: 133 switch (code) { 134 case BUS_ADRALN: return "BUS_ADRALN"; 135 case BUS_ADRERR: return "BUS_ADRERR"; 136 case BUS_OBJERR: return "BUS_OBJERR"; 137 } 138 break; 139 case SIGFPE: 140 switch (code) { 141 case FPE_INTDIV: return "FPE_INTDIV"; 142 case FPE_INTOVF: return "FPE_INTOVF"; 143 case FPE_FLTDIV: return "FPE_FLTDIV"; 144 case FPE_FLTOVF: return "FPE_FLTOVF"; 145 case FPE_FLTUND: return "FPE_FLTUND"; 146 case FPE_FLTRES: return "FPE_FLTRES"; 147 case FPE_FLTINV: return "FPE_FLTINV"; 148 case FPE_FLTSUB: return "FPE_FLTSUB"; 149 } 150 break; 151 case SIGSEGV: 152 switch (code) { 153 case SEGV_MAPERR: return "SEGV_MAPERR"; 154 case SEGV_ACCERR: return "SEGV_ACCERR"; 155 } 156 break; 157 } 158 return "?"; 159 } 160 161 void dump_fault_addr(int tfd, int pid, int sig) 162 { 163 siginfo_t si; 164 165 memset(&si, 0, sizeof(si)); 166 if(ptrace(PTRACE_GETSIGINFO, pid, 0, &si)){ 167 _LOG(tfd, false, "cannot get siginfo: %s\n", strerror(errno)); 168 } else { 169 _LOG(tfd, false, "signal %d (%s), code %d (%s), fault addr %08x\n", 170 sig, get_signame(sig), 171 si.si_code, get_sigcode(sig, si.si_code), 172 si.si_addr); 173 } 174 } 175 176 void dump_crash_banner(int tfd, unsigned pid, unsigned tid, int sig) 177 { 178 char data[1024]; 179 char *x = 0; 180 FILE *fp; 181 182 sprintf(data, "/proc/%d/cmdline", pid); 183 fp = fopen(data, "r"); 184 if(fp) { 185 x = fgets(data, 1024, fp); 186 fclose(fp); 187 } 188 189 _LOG(tfd, false, 190 "*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***\n"); 191 dump_build_info(tfd); 192 _LOG(tfd, false, "pid: %d, tid: %d >>> %s <<<\n", 193 pid, tid, x ? x : "UNKNOWN"); 194 195 if(sig) dump_fault_addr(tfd, tid, sig); 196 } 197 198 static void parse_elf_info(mapinfo *milist, pid_t pid) 199 { 200 mapinfo *mi; 201 for (mi = milist; mi != NULL; mi = mi->next) { 202 Elf32_Ehdr ehdr; 203 204 memset(&ehdr, 0, sizeof(Elf32_Ehdr)); 205 /* Read in sizeof(Elf32_Ehdr) worth of data from the beginning of 206 * mapped section. 207 */ 208 get_remote_struct(pid, (void *) (mi->start), &ehdr, 209 sizeof(Elf32_Ehdr)); 210 /* Check if it has the matching magic words */ 211 if (IS_ELF(ehdr)) { 212 Elf32_Phdr phdr; 213 Elf32_Phdr *ptr; 214 int i; 215 216 ptr = (Elf32_Phdr *) (mi->start + ehdr.e_phoff); 217 for (i = 0; i < ehdr.e_phnum; i++) { 218 /* Parse the program header */ 219 get_remote_struct(pid, (char *) (ptr+i), &phdr, 220 sizeof(Elf32_Phdr)); 221 #ifdef __arm__ 222 /* Found a EXIDX segment? */ 223 if (phdr.p_type == PT_ARM_EXIDX) { 224 mi->exidx_start = mi->start + phdr.p_offset; 225 mi->exidx_end = mi->exidx_start + phdr.p_filesz; 226 break; 227 } 228 #endif 229 } 230 231 /* Try to load symbols from this file */ 232 mi->symbols = symbol_table_create(mi->name); 233 } 234 } 235 } 236 237 void dump_crash_report(int tfd, unsigned pid, unsigned tid, bool at_fault) 238 { 239 char data[1024]; 240 FILE *fp; 241 mapinfo *milist = 0; 242 unsigned int sp_list[STACK_CONTENT_DEPTH]; 243 int stack_depth; 244 #ifdef __arm__ 245 int frame0_pc_sane = 1; 246 #endif 247 248 if (!at_fault) { 249 _LOG(tfd, true, 250 "--- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---\n"); 251 _LOG(tfd, true, "pid: %d, tid: %d\n", pid, tid); 252 } 253 254 dump_registers(tfd, tid, at_fault); 255 256 /* Clear stack pointer records */ 257 memset(sp_list, 0, sizeof(sp_list)); 258 259 sprintf(data, "/proc/%d/maps", pid); 260 fp = fopen(data, "r"); 261 if(fp) { 262 while(fgets(data, 1024, fp)) { 263 mapinfo *mi = parse_maps_line(data); 264 if(mi) { 265 mi->next = milist; 266 milist = mi; 267 } 268 } 269 fclose(fp); 270 } 271 272 parse_elf_info(milist, tid); 273 274 #if __arm__ 275 /* If stack unwinder fails, use the default solution to dump the stack 276 * content. 277 */ 278 stack_depth = unwind_backtrace_with_ptrace(tfd, tid, milist, sp_list, 279 &frame0_pc_sane, at_fault); 280 281 /* The stack unwinder should at least unwind two levels of stack. If less 282 * level is seen we make sure at lease pc and lr are dumped. 283 */ 284 if (stack_depth < 2) { 285 dump_pc_and_lr(tfd, tid, milist, stack_depth, at_fault); 286 } 287 288 dump_stack_and_code(tfd, tid, milist, stack_depth, sp_list, at_fault); 289 #elif __i386__ 290 /* If stack unwinder fails, use the default solution to dump the stack 291 * content. 292 */ 293 stack_depth = unwind_backtrace_with_ptrace_x86(tfd, tid, milist,at_fault); 294 #else 295 #error "Unsupported architecture" 296 #endif 297 298 while(milist) { 299 mapinfo *next = milist->next; 300 symbol_table_free(milist->symbols); 301 free(milist); 302 milist = next; 303 } 304 } 305 306 #define MAX_TOMBSTONES 10 307 308 #define typecheck(x,y) { \ 309 typeof(x) __dummy1; \ 310 typeof(y) __dummy2; \ 311 (void)(&__dummy1 == &__dummy2); } 312 313 #define TOMBSTONE_DIR "/data/tombstones" 314 315 /* 316 * find_and_open_tombstone - find an available tombstone slot, if any, of the 317 * form tombstone_XX where XX is 00 to MAX_TOMBSTONES-1, inclusive. If no 318 * file is available, we reuse the least-recently-modified file. 319 */ 320 static int find_and_open_tombstone(void) 321 { 322 unsigned long mtime = ULONG_MAX; 323 struct stat sb; 324 char path[128]; 325 int fd, i, oldest = 0; 326 327 /* 328 * XXX: Our stat.st_mtime isn't time_t. If it changes, as it probably ought 329 * to, our logic breaks. This check will generate a warning if that happens. 330 */ 331 typecheck(mtime, sb.st_mtime); 332 333 /* 334 * In a single wolf-like pass, find an available slot and, in case none 335 * exist, find and record the least-recently-modified file. 336 */ 337 for (i = 0; i < MAX_TOMBSTONES; i++) { 338 snprintf(path, sizeof(path), TOMBSTONE_DIR"/tombstone_%02d", i); 339 340 if (!stat(path, &sb)) { 341 if (sb.st_mtime < mtime) { 342 oldest = i; 343 mtime = sb.st_mtime; 344 } 345 continue; 346 } 347 if (errno != ENOENT) 348 continue; 349 350 fd = open(path, O_CREAT | O_EXCL | O_WRONLY, 0600); 351 if (fd < 0) 352 continue; /* raced ? */ 353 354 fchown(fd, AID_SYSTEM, AID_SYSTEM); 355 return fd; 356 } 357 358 /* we didn't find an available file, so we clobber the oldest one */ 359 snprintf(path, sizeof(path), TOMBSTONE_DIR"/tombstone_%02d", oldest); 360 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600); 361 fchown(fd, AID_SYSTEM, AID_SYSTEM); 362 363 return fd; 364 } 365 366 /* Return true if some thread is not detached cleanly */ 367 static bool dump_sibling_thread_report(int tfd, unsigned pid, unsigned tid) 368 { 369 char task_path[1024]; 370 371 sprintf(task_path, "/proc/%d/task", pid); 372 DIR *d; 373 struct dirent *de; 374 int need_cleanup = 0; 375 376 d = opendir(task_path); 377 /* Bail early if cannot open the task directory */ 378 if (d == NULL) { 379 XLOG("Cannot open /proc/%d/task\n", pid); 380 return false; 381 } 382 while ((de = readdir(d)) != NULL) { 383 unsigned new_tid; 384 /* Ignore "." and ".." */ 385 if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, "..")) 386 continue; 387 new_tid = atoi(de->d_name); 388 /* The main thread at fault has been handled individually */ 389 if (new_tid == tid) 390 continue; 391 392 /* Skip this thread if cannot ptrace it */ 393 if (ptrace(PTRACE_ATTACH, new_tid, 0, 0) < 0) 394 continue; 395 396 dump_crash_report(tfd, pid, new_tid, false); 397 need_cleanup |= ptrace(PTRACE_DETACH, new_tid, 0, 0); 398 } 399 closedir(d); 400 return need_cleanup != 0; 401 } 402 403 /* Return true if some thread is not detached cleanly */ 404 static bool engrave_tombstone(unsigned pid, unsigned tid, int debug_uid, 405 int signal) 406 { 407 int fd; 408 bool need_cleanup = false; 409 410 mkdir(TOMBSTONE_DIR, 0755); 411 chown(TOMBSTONE_DIR, AID_SYSTEM, AID_SYSTEM); 412 413 fd = find_and_open_tombstone(); 414 if (fd < 0) 415 return need_cleanup; 416 417 dump_crash_banner(fd, pid, tid, signal); 418 dump_crash_report(fd, pid, tid, true); 419 /* 420 * If the user has requested to attach gdb, don't collect the per-thread 421 * information as it increases the chance to lose track of the process. 422 */ 423 if ((signed)pid > debug_uid) { 424 need_cleanup = dump_sibling_thread_report(fd, pid, tid); 425 } 426 427 close(fd); 428 return need_cleanup; 429 } 430 431 static int 432 write_string(const char* file, const char* string) 433 { 434 int len; 435 int fd; 436 ssize_t amt; 437 fd = open(file, O_RDWR); 438 len = strlen(string); 439 if (fd < 0) 440 return -errno; 441 amt = write(fd, string, len); 442 close(fd); 443 return amt >= 0 ? 0 : -errno; 444 } 445 446 static 447 void init_debug_led(void) 448 { 449 // trout leds 450 write_string("/sys/class/leds/red/brightness", "0"); 451 write_string("/sys/class/leds/green/brightness", "0"); 452 write_string("/sys/class/leds/blue/brightness", "0"); 453 write_string("/sys/class/leds/red/device/blink", "0"); 454 // sardine leds 455 write_string("/sys/class/leds/left/cadence", "0,0"); 456 } 457 458 static 459 void enable_debug_led(void) 460 { 461 // trout leds 462 write_string("/sys/class/leds/red/brightness", "255"); 463 // sardine leds 464 write_string("/sys/class/leds/left/cadence", "1,0"); 465 } 466 467 static 468 void disable_debug_led(void) 469 { 470 // trout leds 471 write_string("/sys/class/leds/red/brightness", "0"); 472 // sardine leds 473 write_string("/sys/class/leds/left/cadence", "0,0"); 474 } 475 476 extern int init_getevent(); 477 extern void uninit_getevent(); 478 extern int get_event(struct input_event* event, int timeout); 479 480 static void wait_for_user_action(unsigned tid, struct ucred* cr) 481 { 482 (void)tid; 483 /* First log a helpful message */ 484 LOG( "********************************************************\n" 485 "* Process %d has been suspended while crashing. To\n" 486 "* attach gdbserver for a gdb connection on port 5039:\n" 487 "*\n" 488 "* adb shell gdbserver :5039 --attach %d &\n" 489 "*\n" 490 "* Press HOME key to let the process continue crashing.\n" 491 "********************************************************\n", 492 cr->pid, cr->pid); 493 494 /* wait for HOME key (TODO: something useful for devices w/o HOME key) */ 495 if (init_getevent() == 0) { 496 int ms = 1200 / 10; 497 int dit = 1; 498 int dah = 3*dit; 499 int _ = -dit; 500 int ___ = 3*_; 501 int _______ = 7*_; 502 const signed char codes[] = { 503 dit,_,dit,_,dit,___,dah,_,dah,_,dah,___,dit,_,dit,_,dit,_______ 504 }; 505 size_t s = 0; 506 struct input_event e; 507 int home = 0; 508 init_debug_led(); 509 enable_debug_led(); 510 do { 511 int timeout = abs((int)(codes[s])) * ms; 512 int res = get_event(&e, timeout); 513 if (res == 0) { 514 if (e.type==EV_KEY && e.code==KEY_HOME && e.value==0) 515 home = 1; 516 } else if (res == 1) { 517 if (++s >= sizeof(codes)/sizeof(*codes)) 518 s = 0; 519 if (codes[s] > 0) { 520 enable_debug_led(); 521 } else { 522 disable_debug_led(); 523 } 524 } 525 } while (!home); 526 uninit_getevent(); 527 } 528 529 /* don't forget to turn debug led off */ 530 disable_debug_led(); 531 532 /* close filedescriptor */ 533 LOG("debuggerd resuming process %d", cr->pid); 534 } 535 536 static void handle_crashing_process(int fd) 537 { 538 char buf[64]; 539 struct stat s; 540 unsigned tid; 541 struct ucred cr; 542 int n, len, status; 543 int tid_attach_status = -1; 544 unsigned retry = 30; 545 bool need_cleanup = false; 546 547 char value[PROPERTY_VALUE_MAX]; 548 property_get("debug.db.uid", value, "-1"); 549 int debug_uid = atoi(value); 550 551 XLOG("handle_crashing_process(%d)\n", fd); 552 553 len = sizeof(cr); 554 n = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cr, &len); 555 if(n != 0) { 556 LOG("cannot get credentials\n"); 557 goto done; 558 } 559 560 XLOG("reading tid\n"); 561 fcntl(fd, F_SETFL, O_NONBLOCK); 562 while((n = read(fd, &tid, sizeof(unsigned))) != sizeof(unsigned)) { 563 if(errno == EINTR) continue; 564 if(errno == EWOULDBLOCK) { 565 if(retry-- > 0) { 566 usleep(100 * 1000); 567 continue; 568 } 569 LOG("timed out reading tid\n"); 570 goto done; 571 } 572 LOG("read failure? %s\n", strerror(errno)); 573 goto done; 574 } 575 576 snprintf(buf, sizeof buf, "/proc/%d/task/%d", cr.pid, tid); 577 if(stat(buf, &s)) { 578 LOG("tid %d does not exist in pid %d. ignoring debug request\n", 579 tid, cr.pid); 580 close(fd); 581 return; 582 } 583 584 XLOG("BOOM: pid=%d uid=%d gid=%d tid=%d\n", cr.pid, cr.uid, cr.gid, tid); 585 586 /* Note that at this point, the target thread's signal handler 587 * is blocked in a read() call. This gives us the time to PTRACE_ATTACH 588 * to it before it has a chance to really fault. 589 * 590 * After the attach, the thread is stopped, and we write to the file 591 * descriptor to ensure that it will run as soon as we call PTRACE_CONT 592 * below. See details in bionic/libc/linker/debugger.c, in function 593 * debugger_signal_handler(). 594 */ 595 tid_attach_status = ptrace(PTRACE_ATTACH, tid, 0, 0); 596 int ptrace_error = errno; 597 598 if (TEMP_FAILURE_RETRY(write(fd, &tid, 1)) != 1) { 599 XLOG("failed responding to client: %s\n", 600 strerror(errno)); 601 goto done; 602 } 603 604 if(tid_attach_status < 0) { 605 LOG("ptrace attach failed: %s\n", strerror(ptrace_error)); 606 goto done; 607 } 608 609 close(fd); 610 fd = -1; 611 612 const int sleep_time_usec = 200000; /* 0.2 seconds */ 613 const int max_total_sleep_usec = 3000000; /* 3 seconds */ 614 int loop_limit = max_total_sleep_usec / sleep_time_usec; 615 for(;;) { 616 if (loop_limit-- == 0) { 617 LOG("timed out waiting for pid=%d tid=%d uid=%d to die\n", 618 cr.pid, tid, cr.uid); 619 goto done; 620 } 621 n = waitpid(tid, &status, __WALL | WNOHANG); 622 623 if (n == 0) { 624 /* not ready yet */ 625 XLOG("not ready yet\n"); 626 usleep(sleep_time_usec); 627 continue; 628 } 629 630 if(n < 0) { 631 if(errno == EAGAIN) continue; 632 LOG("waitpid failed: %s\n", strerror(errno)); 633 goto done; 634 } 635 636 XLOG("waitpid: n=%d status=%08x\n", n, status); 637 638 if(WIFSTOPPED(status)){ 639 n = WSTOPSIG(status); 640 switch(n) { 641 case SIGSTOP: 642 XLOG("stopped -- continuing\n"); 643 n = ptrace(PTRACE_CONT, tid, 0, 0); 644 if(n) { 645 LOG("ptrace failed: %s\n", strerror(errno)); 646 goto done; 647 } 648 continue; 649 650 case SIGILL: 651 case SIGABRT: 652 case SIGBUS: 653 case SIGFPE: 654 case SIGSEGV: 655 case SIGSTKFLT: { 656 XLOG("stopped -- fatal signal\n"); 657 need_cleanup = engrave_tombstone(cr.pid, tid, debug_uid, n); 658 kill(tid, SIGSTOP); 659 goto done; 660 } 661 662 default: 663 XLOG("stopped -- unexpected signal\n"); 664 goto done; 665 } 666 } else { 667 XLOG("unexpected waitpid response\n"); 668 goto done; 669 } 670 } 671 672 done: 673 XLOG("detaching\n"); 674 675 /* stop the process so we can debug */ 676 kill(cr.pid, SIGSTOP); 677 678 /* 679 * If a thread has been attached by ptrace, make sure it is detached 680 * successfully otherwise we will get a zombie. 681 */ 682 if (tid_attach_status == 0) { 683 int detach_status; 684 /* detach so we can attach gdbserver */ 685 detach_status = ptrace(PTRACE_DETACH, tid, 0, 0); 686 need_cleanup |= (detach_status != 0); 687 } 688 689 /* 690 * if debug.db.uid is set, its value indicates if we should wait 691 * for user action for the crashing process. 692 * in this case, we log a message and turn the debug LED on 693 * waiting for a gdb connection (for instance) 694 */ 695 696 if ((signed)cr.uid <= debug_uid) { 697 wait_for_user_action(tid, &cr); 698 } 699 700 /* resume stopped process (so it can crash in peace) */ 701 kill(cr.pid, SIGCONT); 702 703 if (need_cleanup) { 704 LOG("debuggerd committing suicide to free the zombie!\n"); 705 kill(getpid(), SIGKILL); 706 } 707 708 if(fd != -1) close(fd); 709 } 710 711 712 int main() 713 { 714 int s; 715 struct sigaction act; 716 int logsocket = -1; 717 718 /* 719 * debuggerd crashes can't be reported to debuggerd. Reset all of the 720 * crash handlers. 721 */ 722 signal(SIGILL, SIG_DFL); 723 signal(SIGABRT, SIG_DFL); 724 signal(SIGBUS, SIG_DFL); 725 signal(SIGFPE, SIG_DFL); 726 signal(SIGSEGV, SIG_DFL); 727 signal(SIGSTKFLT, SIG_DFL); 728 signal(SIGPIPE, SIG_DFL); 729 730 logsocket = socket_local_client("logd", 731 ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_DGRAM); 732 if(logsocket < 0) { 733 logsocket = -1; 734 } else { 735 fcntl(logsocket, F_SETFD, FD_CLOEXEC); 736 } 737 738 act.sa_handler = SIG_DFL; 739 sigemptyset(&act.sa_mask); 740 sigaddset(&act.sa_mask,SIGCHLD); 741 act.sa_flags = SA_NOCLDWAIT; 742 sigaction(SIGCHLD, &act, 0); 743 744 s = socket_local_server("android:debuggerd", 745 ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM); 746 if(s < 0) return -1; 747 fcntl(s, F_SETFD, FD_CLOEXEC); 748 749 LOG("debuggerd: " __DATE__ " " __TIME__ "\n"); 750 751 for(;;) { 752 struct sockaddr addr; 753 socklen_t alen; 754 int fd; 755 756 alen = sizeof(addr); 757 XLOG("waiting for connection\n"); 758 fd = accept(s, &addr, &alen); 759 if(fd < 0) { 760 XLOG("accept failed: %s\n", strerror(errno)); 761 continue; 762 } 763 764 fcntl(fd, F_SETFD, FD_CLOEXEC); 765 766 handle_crashing_process(fd); 767 } 768 return 0; 769 } 770
