init.c revision ae6f3d7c05070f7e0e56fe0056c8923c6ee2f473
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 <stdio.h> 18#include <stdlib.h> 19#include <string.h> 20#include <unistd.h> 21#include <fcntl.h> 22#include <ctype.h> 23#include <signal.h> 24#include <sys/wait.h> 25#include <sys/mount.h> 26#include <sys/stat.h> 27#include <sys/poll.h> 28#include <errno.h> 29#include <stdarg.h> 30#include <mtd/mtd-user.h> 31#include <sys/types.h> 32#include <sys/socket.h> 33#include <sys/un.h> 34 35#ifdef HAVE_SELINUX 36#include <selinux/selinux.h> 37#include <selinux/label.h> 38#include <selinux/android.h> 39#endif 40 41#include <libgen.h> 42 43#include <cutils/list.h> 44#include <cutils/sockets.h> 45#include <cutils/iosched_policy.h> 46#include <private/android_filesystem_config.h> 47#include <termios.h> 48 49#include <sys/system_properties.h> 50 51#include "devices.h" 52#include "init.h" 53#include "log.h" 54#include "property_service.h" 55#include "bootchart.h" 56#include "signal_handler.h" 57#include "keychords.h" 58#include "init_parser.h" 59#include "util.h" 60#include "ueventd.h" 61 62#ifdef HAVE_SELINUX 63struct selabel_handle *sehandle; 64#endif 65 66static int property_triggers_enabled = 0; 67 68#if BOOTCHART 69static int bootchart_count; 70#endif 71 72static char console[32]; 73static char bootmode[32]; 74static char hardware[32]; 75static unsigned revision = 0; 76static char qemu[32]; 77 78#ifdef HAVE_SELINUX 79static int selinux_enabled = 1; 80#endif 81 82static struct action *cur_action = NULL; 83static struct command *cur_command = NULL; 84static struct listnode *command_queue = NULL; 85 86void notify_service_state(const char *name, const char *state) 87{ 88 char pname[PROP_NAME_MAX]; 89 int len = strlen(name); 90 if ((len + 10) > PROP_NAME_MAX) 91 return; 92 snprintf(pname, sizeof(pname), "init.svc.%s", name); 93 property_set(pname, state); 94} 95 96static int have_console; 97static char *console_name = "/dev/console"; 98static time_t process_needs_restart; 99 100static const char *ENV[32]; 101 102/* add_environment - add "key=value" to the current environment */ 103int add_environment(const char *key, const char *val) 104{ 105 int n; 106 107 for (n = 0; n < 31; n++) { 108 if (!ENV[n]) { 109 size_t len = strlen(key) + strlen(val) + 2; 110 char *entry = malloc(len); 111 snprintf(entry, len, "%s=%s", key, val); 112 ENV[n] = entry; 113 return 0; 114 } 115 } 116 117 return 1; 118} 119 120static void zap_stdio(void) 121{ 122 int fd; 123 fd = open("/dev/null", O_RDWR); 124 dup2(fd, 0); 125 dup2(fd, 1); 126 dup2(fd, 2); 127 close(fd); 128} 129 130static void open_console() 131{ 132 int fd; 133 if ((fd = open(console_name, O_RDWR)) < 0) { 134 fd = open("/dev/null", O_RDWR); 135 } 136 ioctl(fd, TIOCSCTTY, 0); 137 dup2(fd, 0); 138 dup2(fd, 1); 139 dup2(fd, 2); 140 close(fd); 141} 142 143static void publish_socket(const char *name, int fd) 144{ 145 char key[64] = ANDROID_SOCKET_ENV_PREFIX; 146 char val[64]; 147 148 strlcpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1, 149 name, 150 sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX)); 151 snprintf(val, sizeof(val), "%d", fd); 152 add_environment(key, val); 153 154 /* make sure we don't close-on-exec */ 155 fcntl(fd, F_SETFD, 0); 156} 157 158void service_start(struct service *svc, const char *dynamic_args) 159{ 160 struct stat s; 161 pid_t pid; 162 int needs_console; 163 int n; 164#ifdef HAVE_SELINUX 165 char *scon = NULL; 166 int rc; 167#endif 168 /* starting a service removes it from the disabled or reset 169 * state and immediately takes it out of the restarting 170 * state if it was in there 171 */ 172 svc->flags &= (~(SVC_DISABLED|SVC_RESTARTING|SVC_RESET)); 173 svc->time_started = 0; 174 175 /* running processes require no additional work -- if 176 * they're in the process of exiting, we've ensured 177 * that they will immediately restart on exit, unless 178 * they are ONESHOT 179 */ 180 if (svc->flags & SVC_RUNNING) { 181 return; 182 } 183 184 needs_console = (svc->flags & SVC_CONSOLE) ? 1 : 0; 185 if (needs_console && (!have_console)) { 186 ERROR("service '%s' requires console\n", svc->name); 187 svc->flags |= SVC_DISABLED; 188 return; 189 } 190 191 if (stat(svc->args[0], &s) != 0) { 192 ERROR("cannot find '%s', disabling '%s'\n", svc->args[0], svc->name); 193 svc->flags |= SVC_DISABLED; 194 return; 195 } 196 197 if ((!(svc->flags & SVC_ONESHOT)) && dynamic_args) { 198 ERROR("service '%s' must be one-shot to use dynamic args, disabling\n", 199 svc->args[0]); 200 svc->flags |= SVC_DISABLED; 201 return; 202 } 203 204#ifdef HAVE_SELINUX 205 if (is_selinux_enabled() > 0) { 206 char *mycon = NULL, *fcon = NULL; 207 208 INFO("computing context for service '%s'\n", svc->args[0]); 209 rc = getcon(&mycon); 210 if (rc < 0) { 211 ERROR("could not get context while starting '%s'\n", svc->name); 212 return; 213 } 214 215 rc = getfilecon(svc->args[0], &fcon); 216 if (rc < 0) { 217 ERROR("could not get context while starting '%s'\n", svc->name); 218 freecon(mycon); 219 return; 220 } 221 222 rc = security_compute_create(mycon, fcon, string_to_security_class("process"), &scon); 223 freecon(mycon); 224 freecon(fcon); 225 if (rc < 0) { 226 ERROR("could not get context while starting '%s'\n", svc->name); 227 return; 228 } 229 } 230#endif 231 232 NOTICE("starting '%s'\n", svc->name); 233 234 pid = fork(); 235 236 if (pid == 0) { 237 struct socketinfo *si; 238 struct svcenvinfo *ei; 239 char tmp[32]; 240 int fd, sz; 241 242 umask(077); 243 if (properties_inited()) { 244 get_property_workspace(&fd, &sz); 245 sprintf(tmp, "%d,%d", dup(fd), sz); 246 add_environment("ANDROID_PROPERTY_WORKSPACE", tmp); 247 } 248 249 for (ei = svc->envvars; ei; ei = ei->next) 250 add_environment(ei->name, ei->value); 251 252#ifdef HAVE_SELINUX 253 setsockcreatecon(scon); 254#endif 255 256 for (si = svc->sockets; si; si = si->next) { 257 int socket_type = ( 258 !strcmp(si->type, "stream") ? SOCK_STREAM : 259 (!strcmp(si->type, "dgram") ? SOCK_DGRAM : SOCK_SEQPACKET)); 260 int s = create_socket(si->name, socket_type, 261 si->perm, si->uid, si->gid); 262 if (s >= 0) { 263 publish_socket(si->name, s); 264 } 265 } 266 267#ifdef HAVE_SELINUX 268 freecon(scon); 269 scon = NULL; 270 setsockcreatecon(NULL); 271#endif 272 273 if (svc->ioprio_class != IoSchedClass_NONE) { 274 if (android_set_ioprio(getpid(), svc->ioprio_class, svc->ioprio_pri)) { 275 ERROR("Failed to set pid %d ioprio = %d,%d: %s\n", 276 getpid(), svc->ioprio_class, svc->ioprio_pri, strerror(errno)); 277 } 278 } 279 280 if (needs_console) { 281 setsid(); 282 open_console(); 283 } else { 284 zap_stdio(); 285 } 286 287#if 0 288 for (n = 0; svc->args[n]; n++) { 289 INFO("args[%d] = '%s'\n", n, svc->args[n]); 290 } 291 for (n = 0; ENV[n]; n++) { 292 INFO("env[%d] = '%s'\n", n, ENV[n]); 293 } 294#endif 295 296 setpgid(0, getpid()); 297 298 /* as requested, set our gid, supplemental gids, and uid */ 299 if (svc->gid) { 300 if (setgid(svc->gid) != 0) { 301 ERROR("setgid failed: %s\n", strerror(errno)); 302 _exit(127); 303 } 304 } 305 if (svc->nr_supp_gids) { 306 if (setgroups(svc->nr_supp_gids, svc->supp_gids) != 0) { 307 ERROR("setgroups failed: %s\n", strerror(errno)); 308 _exit(127); 309 } 310 } 311 if (svc->uid) { 312 if (setuid(svc->uid) != 0) { 313 ERROR("setuid failed: %s\n", strerror(errno)); 314 _exit(127); 315 } 316 } 317 318#ifdef HAVE_SELINUX 319 if (svc->seclabel) { 320 if (is_selinux_enabled() > 0 && setexeccon(svc->seclabel) < 0) { 321 ERROR("cannot setexeccon('%s'): %s\n", svc->seclabel, strerror(errno)); 322 _exit(127); 323 } 324 } 325#endif 326 327 if (!dynamic_args) { 328 if (execve(svc->args[0], (char**) svc->args, (char**) ENV) < 0) { 329 ERROR("cannot execve('%s'): %s\n", svc->args[0], strerror(errno)); 330 } 331 } else { 332 char *arg_ptrs[INIT_PARSER_MAXARGS+1]; 333 int arg_idx = svc->nargs; 334 char *tmp = strdup(dynamic_args); 335 char *next = tmp; 336 char *bword; 337 338 /* Copy the static arguments */ 339 memcpy(arg_ptrs, svc->args, (svc->nargs * sizeof(char *))); 340 341 while((bword = strsep(&next, " "))) { 342 arg_ptrs[arg_idx++] = bword; 343 if (arg_idx == INIT_PARSER_MAXARGS) 344 break; 345 } 346 arg_ptrs[arg_idx] = '\0'; 347 execve(svc->args[0], (char**) arg_ptrs, (char**) ENV); 348 } 349 _exit(127); 350 } 351 352#ifdef HAVE_SELINUX 353 freecon(scon); 354#endif 355 356 if (pid < 0) { 357 ERROR("failed to start '%s'\n", svc->name); 358 svc->pid = 0; 359 return; 360 } 361 362 svc->time_started = gettime(); 363 svc->pid = pid; 364 svc->flags |= SVC_RUNNING; 365 366 if (properties_inited()) 367 notify_service_state(svc->name, "running"); 368} 369 370/* The how field should be either SVC_DISABLED or SVC_RESET */ 371static void service_stop_or_reset(struct service *svc, int how) 372{ 373 /* we are no longer running, nor should we 374 * attempt to restart 375 */ 376 svc->flags &= (~(SVC_RUNNING|SVC_RESTARTING)); 377 378 if ((how != SVC_DISABLED) && (how != SVC_RESET)) { 379 /* Hrm, an illegal flag. Default to SVC_DISABLED */ 380 how = SVC_DISABLED; 381 } 382 /* if the service has not yet started, prevent 383 * it from auto-starting with its class 384 */ 385 if (how == SVC_RESET) { 386 svc->flags |= (svc->flags & SVC_RC_DISABLED) ? SVC_DISABLED : SVC_RESET; 387 } else { 388 svc->flags |= how; 389 } 390 391 if (svc->pid) { 392 NOTICE("service '%s' is being killed\n", svc->name); 393 kill(-svc->pid, SIGKILL); 394 notify_service_state(svc->name, "stopping"); 395 } else { 396 notify_service_state(svc->name, "stopped"); 397 } 398} 399 400void service_reset(struct service *svc) 401{ 402 service_stop_or_reset(svc, SVC_RESET); 403} 404 405void service_stop(struct service *svc) 406{ 407 service_stop_or_reset(svc, SVC_DISABLED); 408} 409 410void property_changed(const char *name, const char *value) 411{ 412 if (property_triggers_enabled) 413 queue_property_triggers(name, value); 414} 415 416static void restart_service_if_needed(struct service *svc) 417{ 418 time_t next_start_time = svc->time_started + 5; 419 420 if (next_start_time <= gettime()) { 421 svc->flags &= (~SVC_RESTARTING); 422 service_start(svc, NULL); 423 return; 424 } 425 426 if ((next_start_time < process_needs_restart) || 427 (process_needs_restart == 0)) { 428 process_needs_restart = next_start_time; 429 } 430} 431 432static void restart_processes() 433{ 434 process_needs_restart = 0; 435 service_for_each_flags(SVC_RESTARTING, 436 restart_service_if_needed); 437} 438 439static void msg_start(const char *name) 440{ 441 struct service *svc; 442 char *tmp = NULL; 443 char *args = NULL; 444 445 if (!strchr(name, ':')) 446 svc = service_find_by_name(name); 447 else { 448 tmp = strdup(name); 449 args = strchr(tmp, ':'); 450 *args = '\0'; 451 args++; 452 453 svc = service_find_by_name(tmp); 454 } 455 456 if (svc) { 457 service_start(svc, args); 458 } else { 459 ERROR("no such service '%s'\n", name); 460 } 461 if (tmp) 462 free(tmp); 463} 464 465static void msg_stop(const char *name) 466{ 467 struct service *svc = service_find_by_name(name); 468 469 if (svc) { 470 service_stop(svc); 471 } else { 472 ERROR("no such service '%s'\n", name); 473 } 474} 475 476void handle_control_message(const char *msg, const char *arg) 477{ 478 if (!strcmp(msg,"start")) { 479 msg_start(arg); 480 } else if (!strcmp(msg,"stop")) { 481 msg_stop(arg); 482 } else if (!strcmp(msg,"restart")) { 483 msg_stop(arg); 484 msg_start(arg); 485 } else { 486 ERROR("unknown control msg '%s'\n", msg); 487 } 488} 489 490static struct command *get_first_command(struct action *act) 491{ 492 struct listnode *node; 493 node = list_head(&act->commands); 494 if (!node || list_empty(&act->commands)) 495 return NULL; 496 497 return node_to_item(node, struct command, clist); 498} 499 500static struct command *get_next_command(struct action *act, struct command *cmd) 501{ 502 struct listnode *node; 503 node = cmd->clist.next; 504 if (!node) 505 return NULL; 506 if (node == &act->commands) 507 return NULL; 508 509 return node_to_item(node, struct command, clist); 510} 511 512static int is_last_command(struct action *act, struct command *cmd) 513{ 514 return (list_tail(&act->commands) == &cmd->clist); 515} 516 517void execute_one_command(void) 518{ 519 int ret; 520 521 if (!cur_action || !cur_command || is_last_command(cur_action, cur_command)) { 522 cur_action = action_remove_queue_head(); 523 cur_command = NULL; 524 if (!cur_action) 525 return; 526 INFO("processing action %p (%s)\n", cur_action, cur_action->name); 527 cur_command = get_first_command(cur_action); 528 } else { 529 cur_command = get_next_command(cur_action, cur_command); 530 } 531 532 if (!cur_command) 533 return; 534 535 ret = cur_command->func(cur_command->nargs, cur_command->args); 536 INFO("command '%s' r=%d\n", cur_command->args[0], ret); 537} 538 539static int wait_for_coldboot_done_action(int nargs, char **args) 540{ 541 int ret; 542 INFO("wait for %s\n", coldboot_done); 543 ret = wait_for_file(coldboot_done, COMMAND_RETRY_TIMEOUT); 544 if (ret) 545 ERROR("Timed out waiting for %s\n", coldboot_done); 546 return ret; 547} 548 549static int keychord_init_action(int nargs, char **args) 550{ 551 keychord_init(); 552 return 0; 553} 554 555static int console_init_action(int nargs, char **args) 556{ 557 int fd; 558 char tmp[PROP_VALUE_MAX]; 559 560 if (console[0]) { 561 snprintf(tmp, sizeof(tmp), "/dev/%s", console); 562 console_name = strdup(tmp); 563 } 564 565 fd = open(console_name, O_RDWR); 566 if (fd >= 0) 567 have_console = 1; 568 close(fd); 569 570 if( load_565rle_image(INIT_IMAGE_FILE) ) { 571 fd = open("/dev/tty0", O_WRONLY); 572 if (fd >= 0) { 573 const char *msg; 574 msg = "\n" 575 "\n" 576 "\n" 577 "\n" 578 "\n" 579 "\n" 580 "\n" // console is 40 cols x 30 lines 581 "\n" 582 "\n" 583 "\n" 584 "\n" 585 "\n" 586 "\n" 587 "\n" 588 " A N D R O I D "; 589 write(fd, msg, strlen(msg)); 590 close(fd); 591 } 592 } 593 return 0; 594} 595 596static void import_kernel_nv(char *name, int for_emulator) 597{ 598 char *value = strchr(name, '='); 599 int name_len = strlen(name); 600 601 if (value == 0) return; 602 *value++ = 0; 603 if (name_len == 0) return; 604 605#ifdef HAVE_SELINUX 606 if (!strcmp(name,"selinux")) { 607 selinux_enabled = atoi(value); 608 } 609#endif 610 611 if (for_emulator) { 612 /* in the emulator, export any kernel option with the 613 * ro.kernel. prefix */ 614 char buff[PROP_NAME_MAX]; 615 int len = snprintf( buff, sizeof(buff), "ro.kernel.%s", name ); 616 617 if (len < (int)sizeof(buff)) 618 property_set( buff, value ); 619 return; 620 } 621 622 if (!strcmp(name,"qemu")) { 623 strlcpy(qemu, value, sizeof(qemu)); 624 } else if (!strncmp(name, "androidboot.", 12) && name_len > 12) { 625 const char *boot_prop_name = name + 12; 626 char prop[PROP_NAME_MAX]; 627 int cnt; 628 629 cnt = snprintf(prop, sizeof(prop), "ro.boot.%s", boot_prop_name); 630 if (cnt < PROP_NAME_MAX) 631 property_set(prop, value); 632 } 633} 634 635static void export_kernel_boot_props(void) 636{ 637 char tmp[PROP_VALUE_MAX]; 638 const char *pval; 639 unsigned i; 640 struct { 641 const char *src_prop; 642 const char *dest_prop; 643 const char *def_val; 644 } prop_map[] = { 645 { "ro.boot.serialno", "ro.serialno", "", }, 646 { "ro.boot.mode", "ro.bootmode", "unknown", }, 647 { "ro.boot.baseband", "ro.baseband", "unknown", }, 648 { "ro.boot.bootloader", "ro.bootloader", "unknown", }, 649 }; 650 651 for (i = 0; i < ARRAY_SIZE(prop_map); i++) { 652 pval = property_get(prop_map[i].src_prop); 653 property_set(prop_map[i].dest_prop, pval ?: prop_map[i].def_val); 654 } 655 656 pval = property_get("ro.boot.console"); 657 if (pval) 658 strlcpy(console, pval, sizeof(console)); 659 660 /* save a copy for init's usage during boot */ 661 strlcpy(bootmode, property_get("ro.bootmode"), sizeof(bootmode)); 662 663 /* if this was given on kernel command line, override what we read 664 * before (e.g. from /proc/cpuinfo), if anything */ 665 pval = property_get("ro.boot.hardware"); 666 if (pval) 667 strlcpy(hardware, pval, sizeof(hardware)); 668 property_set("ro.hardware", hardware); 669 670 snprintf(tmp, PROP_VALUE_MAX, "%d", revision); 671 property_set("ro.revision", tmp); 672 673 /* TODO: these are obsolete. We should delete them */ 674 if (!strcmp(bootmode,"factory")) 675 property_set("ro.factorytest", "1"); 676 else if (!strcmp(bootmode,"factory2")) 677 property_set("ro.factorytest", "2"); 678 else 679 property_set("ro.factorytest", "0"); 680} 681 682static void process_kernel_cmdline(void) 683{ 684 /* don't expose the raw commandline to nonpriv processes */ 685 chmod("/proc/cmdline", 0440); 686 687 /* first pass does the common stuff, and finds if we are in qemu. 688 * second pass is only necessary for qemu to export all kernel params 689 * as props. 690 */ 691 import_kernel_cmdline(0, import_kernel_nv); 692 if (qemu[0]) 693 import_kernel_cmdline(1, import_kernel_nv); 694 695 /* now propogate the info given on command line to internal variables 696 * used by init as well as the current required properties 697 */ 698 export_kernel_boot_props(); 699} 700 701static int property_service_init_action(int nargs, char **args) 702{ 703 /* read any property files on system or data and 704 * fire up the property service. This must happen 705 * after the ro.foo properties are set above so 706 * that /data/local.prop cannot interfere with them. 707 */ 708 start_property_service(); 709 return 0; 710} 711 712static int signal_init_action(int nargs, char **args) 713{ 714 signal_init(); 715 return 0; 716} 717 718static int check_startup_action(int nargs, char **args) 719{ 720 /* make sure we actually have all the pieces we need */ 721 if ((get_property_set_fd() < 0) || 722 (get_signal_fd() < 0)) { 723 ERROR("init startup failure\n"); 724 exit(1); 725 } 726 727 /* signal that we hit this point */ 728 unlink("/dev/.booting"); 729 730 return 0; 731} 732 733static int queue_property_triggers_action(int nargs, char **args) 734{ 735 queue_all_property_triggers(); 736 /* enable property triggers */ 737 property_triggers_enabled = 1; 738 return 0; 739} 740 741#if BOOTCHART 742static int bootchart_init_action(int nargs, char **args) 743{ 744 bootchart_count = bootchart_init(); 745 if (bootchart_count < 0) { 746 ERROR("bootcharting init failure\n"); 747 } else if (bootchart_count > 0) { 748 NOTICE("bootcharting started (period=%d ms)\n", bootchart_count*BOOTCHART_POLLING_MS); 749 } else { 750 NOTICE("bootcharting ignored\n"); 751 } 752 753 return 0; 754} 755#endif 756 757#ifdef HAVE_SELINUX 758void selinux_init_all_handles(void) 759{ 760 sehandle = selinux_android_file_context_handle(); 761} 762 763int selinux_reload_policy(void) 764{ 765 if (!selinux_enabled) { 766 return -1; 767 } 768 769 INFO("SELinux: Attempting to reload policy files\n"); 770 771 if (selinux_android_reload_policy() == -1) { 772 return -1; 773 } 774 775 if (sehandle) 776 selabel_close(sehandle); 777 778 selinux_init_all_handles(); 779 return 0; 780} 781#endif 782 783int main(int argc, char **argv) 784{ 785 int fd_count = 0; 786 struct pollfd ufds[4]; 787 char *tmpdev; 788 char* debuggable; 789 char tmp[32]; 790 int property_set_fd_init = 0; 791 int signal_fd_init = 0; 792 int keychord_fd_init = 0; 793 bool is_charger = false; 794 795 if (!strcmp(basename(argv[0]), "ueventd")) 796 return ueventd_main(argc, argv); 797 798 /* clear the umask */ 799 umask(0); 800 801 /* Get the basic filesystem setup we need put 802 * together in the initramdisk on / and then we'll 803 * let the rc file figure out the rest. 804 */ 805 mkdir("/dev", 0755); 806 mkdir("/proc", 0755); 807 mkdir("/sys", 0755); 808 809 mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755"); 810 mkdir("/dev/pts", 0755); 811 mkdir("/dev/socket", 0755); 812 mount("devpts", "/dev/pts", "devpts", 0, NULL); 813 mount("proc", "/proc", "proc", 0, NULL); 814 mount("sysfs", "/sys", "sysfs", 0, NULL); 815 816 /* indicate that booting is in progress to background fw loaders, etc */ 817 close(open("/dev/.booting", O_WRONLY | O_CREAT, 0000)); 818 819 /* We must have some place other than / to create the 820 * device nodes for kmsg and null, otherwise we won't 821 * be able to remount / read-only later on. 822 * Now that tmpfs is mounted on /dev, we can actually 823 * talk to the outside world. 824 */ 825 open_devnull_stdio(); 826 klog_init(); 827 property_init(); 828 829 get_hardware_name(hardware, &revision); 830 831 process_kernel_cmdline(); 832 833#ifdef HAVE_SELINUX 834 INFO("loading selinux policy\n"); 835 if (selinux_enabled) { 836 if (selinux_android_load_policy() < 0) { 837 selinux_enabled = 0; 838 INFO("SELinux: Disabled due to failed policy load\n"); 839 } else { 840 selinux_init_all_handles(); 841 } 842 } else { 843 INFO("SELinux: Disabled by command line option\n"); 844 } 845 /* These directories were necessarily created before initial policy load 846 * and therefore need their security context restored to the proper value. 847 * This must happen before /dev is populated by ueventd. 848 */ 849 restorecon("/dev"); 850 restorecon("/dev/socket"); 851#endif 852 853 is_charger = !strcmp(bootmode, "charger"); 854 855 INFO("property init\n"); 856 if (!is_charger) 857 property_load_boot_defaults(); 858 859 INFO("reading config file\n"); 860 init_parse_config_file("/init.rc"); 861 862 action_for_each_trigger("early-init", action_add_queue_tail); 863 864 queue_builtin_action(wait_for_coldboot_done_action, "wait_for_coldboot_done"); 865 queue_builtin_action(keychord_init_action, "keychord_init"); 866 queue_builtin_action(console_init_action, "console_init"); 867 868 /* execute all the boot actions to get us started */ 869 action_for_each_trigger("init", action_add_queue_tail); 870 871 /* skip mounting filesystems in charger mode */ 872 if (!is_charger) { 873 action_for_each_trigger("early-fs", action_add_queue_tail); 874 action_for_each_trigger("fs", action_add_queue_tail); 875 action_for_each_trigger("post-fs", action_add_queue_tail); 876 action_for_each_trigger("post-fs-data", action_add_queue_tail); 877 } 878 879 queue_builtin_action(property_service_init_action, "property_service_init"); 880 queue_builtin_action(signal_init_action, "signal_init"); 881 queue_builtin_action(check_startup_action, "check_startup"); 882 883 if (is_charger) { 884 action_for_each_trigger("charger", action_add_queue_tail); 885 } else { 886 action_for_each_trigger("early-boot", action_add_queue_tail); 887 action_for_each_trigger("boot", action_add_queue_tail); 888 } 889 890 /* run all property triggers based on current state of the properties */ 891 queue_builtin_action(queue_property_triggers_action, "queue_property_triggers"); 892 893 894#if BOOTCHART 895 queue_builtin_action(bootchart_init_action, "bootchart_init"); 896#endif 897 898 for(;;) { 899 int nr, i, timeout = -1; 900 901 execute_one_command(); 902 restart_processes(); 903 904 if (!property_set_fd_init && get_property_set_fd() > 0) { 905 ufds[fd_count].fd = get_property_set_fd(); 906 ufds[fd_count].events = POLLIN; 907 ufds[fd_count].revents = 0; 908 fd_count++; 909 property_set_fd_init = 1; 910 } 911 if (!signal_fd_init && get_signal_fd() > 0) { 912 ufds[fd_count].fd = get_signal_fd(); 913 ufds[fd_count].events = POLLIN; 914 ufds[fd_count].revents = 0; 915 fd_count++; 916 signal_fd_init = 1; 917 } 918 if (!keychord_fd_init && get_keychord_fd() > 0) { 919 ufds[fd_count].fd = get_keychord_fd(); 920 ufds[fd_count].events = POLLIN; 921 ufds[fd_count].revents = 0; 922 fd_count++; 923 keychord_fd_init = 1; 924 } 925 926 if (process_needs_restart) { 927 timeout = (process_needs_restart - gettime()) * 1000; 928 if (timeout < 0) 929 timeout = 0; 930 } 931 932 if (!action_queue_empty() || cur_action) 933 timeout = 0; 934 935#if BOOTCHART 936 if (bootchart_count > 0) { 937 if (timeout < 0 || timeout > BOOTCHART_POLLING_MS) 938 timeout = BOOTCHART_POLLING_MS; 939 if (bootchart_step() < 0 || --bootchart_count == 0) { 940 bootchart_finish(); 941 bootchart_count = 0; 942 } 943 } 944#endif 945 946 nr = poll(ufds, fd_count, timeout); 947 if (nr <= 0) 948 continue; 949 950 for (i = 0; i < fd_count; i++) { 951 if (ufds[i].revents == POLLIN) { 952 if (ufds[i].fd == get_property_set_fd()) 953 handle_property_set_fd(); 954 else if (ufds[i].fd == get_keychord_fd()) 955 handle_keychord(); 956 else if (ufds[i].fd == get_signal_fd()) 957 handle_signal(); 958 } 959 } 960 } 961 962 return 0; 963} 964