init.c revision 45e8fc6bfd9221274f48861287ff7af06ee7a199
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#include <libgen.h> 35 36#include <cutils/sockets.h> 37#include <cutils/iosched_policy.h> 38#include <private/android_filesystem_config.h> 39#include <termios.h> 40 41#include <sys/system_properties.h> 42 43#include "devices.h" 44#include "init.h" 45#include "list.h" 46#include "log.h" 47#include "property_service.h" 48#include "bootchart.h" 49#include "signal_handler.h" 50#include "keychords.h" 51#include "init_parser.h" 52#include "util.h" 53#include "ueventd.h" 54 55static int property_triggers_enabled = 0; 56 57#if BOOTCHART 58static int bootchart_count; 59#endif 60 61static char console[32]; 62static char serialno[32]; 63static char bootmode[32]; 64static char baseband[32]; 65static char carrier[32]; 66static char bootloader[32]; 67static char hardware[32]; 68static unsigned revision = 0; 69static char qemu[32]; 70 71static struct action *cur_action = NULL; 72static struct command *cur_command = NULL; 73static struct listnode *command_queue = NULL; 74 75void notify_service_state(const char *name, const char *state) 76{ 77 char pname[PROP_NAME_MAX]; 78 int len = strlen(name); 79 if ((len + 10) > PROP_NAME_MAX) 80 return; 81 snprintf(pname, sizeof(pname), "init.svc.%s", name); 82 property_set(pname, state); 83} 84 85static int have_console; 86static char *console_name = "/dev/console"; 87static time_t process_needs_restart; 88 89static const char *ENV[32]; 90 91/* add_environment - add "key=value" to the current environment */ 92int add_environment(const char *key, const char *val) 93{ 94 int n; 95 96 for (n = 0; n < 31; n++) { 97 if (!ENV[n]) { 98 size_t len = strlen(key) + strlen(val) + 2; 99 char *entry = malloc(len); 100 snprintf(entry, len, "%s=%s", key, val); 101 ENV[n] = entry; 102 return 0; 103 } 104 } 105 106 return 1; 107} 108 109static void zap_stdio(void) 110{ 111 int fd; 112 fd = open("/dev/null", O_RDWR); 113 dup2(fd, 0); 114 dup2(fd, 1); 115 dup2(fd, 2); 116 close(fd); 117} 118 119static void open_console() 120{ 121 int fd; 122 if ((fd = open(console_name, O_RDWR)) < 0) { 123 fd = open("/dev/null", O_RDWR); 124 } 125 dup2(fd, 0); 126 dup2(fd, 1); 127 dup2(fd, 2); 128 close(fd); 129} 130 131static void publish_socket(const char *name, int fd) 132{ 133 char key[64] = ANDROID_SOCKET_ENV_PREFIX; 134 char val[64]; 135 136 strlcpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1, 137 name, 138 sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX)); 139 snprintf(val, sizeof(val), "%d", fd); 140 add_environment(key, val); 141 142 /* make sure we don't close-on-exec */ 143 fcntl(fd, F_SETFD, 0); 144} 145 146void service_start(struct service *svc, const char *dynamic_args) 147{ 148 struct stat s; 149 pid_t pid; 150 int needs_console; 151 int n; 152 153 /* starting a service removes it from the disabled or reset 154 * state and immediately takes it out of the restarting 155 * state if it was in there 156 */ 157 svc->flags &= (~(SVC_DISABLED|SVC_RESTARTING|SVC_RESET)); 158 svc->time_started = 0; 159 160 /* running processes require no additional work -- if 161 * they're in the process of exiting, we've ensured 162 * that they will immediately restart on exit, unless 163 * they are ONESHOT 164 */ 165 if (svc->flags & SVC_RUNNING) { 166 return; 167 } 168 169 needs_console = (svc->flags & SVC_CONSOLE) ? 1 : 0; 170 if (needs_console && (!have_console)) { 171 ERROR("service '%s' requires console\n", svc->name); 172 svc->flags |= SVC_DISABLED; 173 return; 174 } 175 176 if (stat(svc->args[0], &s) != 0) { 177 ERROR("cannot find '%s', disabling '%s'\n", svc->args[0], svc->name); 178 svc->flags |= SVC_DISABLED; 179 return; 180 } 181 182 if ((!(svc->flags & SVC_ONESHOT)) && dynamic_args) { 183 ERROR("service '%s' must be one-shot to use dynamic args, disabling\n", 184 svc->args[0]); 185 svc->flags |= SVC_DISABLED; 186 return; 187 } 188 189 NOTICE("starting '%s'\n", svc->name); 190 191 pid = fork(); 192 193 if (pid == 0) { 194 struct socketinfo *si; 195 struct svcenvinfo *ei; 196 char tmp[32]; 197 int fd, sz; 198 199 if (properties_inited()) { 200 get_property_workspace(&fd, &sz); 201 sprintf(tmp, "%d,%d", dup(fd), sz); 202 add_environment("ANDROID_PROPERTY_WORKSPACE", tmp); 203 } 204 205 for (ei = svc->envvars; ei; ei = ei->next) 206 add_environment(ei->name, ei->value); 207 208 for (si = svc->sockets; si; si = si->next) { 209 int socket_type = ( 210 !strcmp(si->type, "stream") ? SOCK_STREAM : 211 (!strcmp(si->type, "dgram") ? SOCK_DGRAM : SOCK_SEQPACKET)); 212 int s = create_socket(si->name, socket_type, 213 si->perm, si->uid, si->gid); 214 if (s >= 0) { 215 publish_socket(si->name, s); 216 } 217 } 218 219 if (svc->ioprio_class != IoSchedClass_NONE) { 220 if (android_set_ioprio(getpid(), svc->ioprio_class, svc->ioprio_pri)) { 221 ERROR("Failed to set pid %d ioprio = %d,%d: %s\n", 222 getpid(), svc->ioprio_class, svc->ioprio_pri, strerror(errno)); 223 } 224 } 225 226 if (needs_console) { 227 setsid(); 228 open_console(); 229 } else { 230 zap_stdio(); 231 } 232 233#if 0 234 for (n = 0; svc->args[n]; n++) { 235 INFO("args[%d] = '%s'\n", n, svc->args[n]); 236 } 237 for (n = 0; ENV[n]; n++) { 238 INFO("env[%d] = '%s'\n", n, ENV[n]); 239 } 240#endif 241 242 setpgid(0, getpid()); 243 244 /* as requested, set our gid, supplemental gids, and uid */ 245 if (svc->gid) { 246 if (setgid(svc->gid) != 0) { 247 ERROR("setgid failed: %s\n", strerror(errno)); 248 _exit(127); 249 } 250 } 251 if (svc->nr_supp_gids) { 252 if (setgroups(svc->nr_supp_gids, svc->supp_gids) != 0) { 253 ERROR("setgroups failed: %s\n", strerror(errno)); 254 _exit(127); 255 } 256 } 257 if (svc->uid) { 258 if (setuid(svc->uid) != 0) { 259 ERROR("setuid failed: %s\n", strerror(errno)); 260 _exit(127); 261 } 262 } 263 264 if (!dynamic_args) { 265 if (execve(svc->args[0], (char**) svc->args, (char**) ENV) < 0) { 266 ERROR("cannot execve('%s'): %s\n", svc->args[0], strerror(errno)); 267 } 268 } else { 269 char *arg_ptrs[INIT_PARSER_MAXARGS+1]; 270 int arg_idx = svc->nargs; 271 char *tmp = strdup(dynamic_args); 272 char *next = tmp; 273 char *bword; 274 275 /* Copy the static arguments */ 276 memcpy(arg_ptrs, svc->args, (svc->nargs * sizeof(char *))); 277 278 while((bword = strsep(&next, " "))) { 279 arg_ptrs[arg_idx++] = bword; 280 if (arg_idx == INIT_PARSER_MAXARGS) 281 break; 282 } 283 arg_ptrs[arg_idx] = '\0'; 284 execve(svc->args[0], (char**) arg_ptrs, (char**) ENV); 285 } 286 _exit(127); 287 } 288 289 if (pid < 0) { 290 ERROR("failed to start '%s'\n", svc->name); 291 svc->pid = 0; 292 return; 293 } 294 295 svc->time_started = gettime(); 296 svc->pid = pid; 297 svc->flags |= SVC_RUNNING; 298 299 if (properties_inited()) 300 notify_service_state(svc->name, "running"); 301} 302 303/* The how field should be either SVC_DISABLED or SVC_RESET */ 304static void service_stop_or_reset(struct service *svc, int how) 305{ 306 /* we are no longer running, nor should we 307 * attempt to restart 308 */ 309 svc->flags &= (~(SVC_RUNNING|SVC_RESTARTING)); 310 311 if ((how != SVC_DISABLED) && (how != SVC_RESET)) { 312 /* Hrm, an illegal flag. Default to SVC_DISABLED */ 313 how = SVC_DISABLED; 314 } 315 /* if the service has not yet started, prevent 316 * it from auto-starting with its class 317 */ 318 svc->flags |= how; 319 320 if (svc->pid) { 321 NOTICE("service '%s' is being killed\n", svc->name); 322 kill(-svc->pid, SIGKILL); 323 notify_service_state(svc->name, "stopping"); 324 } else { 325 notify_service_state(svc->name, "stopped"); 326 } 327} 328 329void service_reset(struct service *svc) 330{ 331 service_stop_or_reset(svc, SVC_RESET); 332} 333 334void service_stop(struct service *svc) 335{ 336 service_stop_or_reset(svc, SVC_DISABLED); 337} 338 339void property_changed(const char *name, const char *value) 340{ 341 if (property_triggers_enabled) 342 queue_property_triggers(name, value); 343} 344 345static void restart_service_if_needed(struct service *svc) 346{ 347 time_t next_start_time = svc->time_started + 5; 348 349 if (next_start_time <= gettime()) { 350 svc->flags &= (~SVC_RESTARTING); 351 service_start(svc, NULL); 352 return; 353 } 354 355 if ((next_start_time < process_needs_restart) || 356 (process_needs_restart == 0)) { 357 process_needs_restart = next_start_time; 358 } 359} 360 361static void restart_processes() 362{ 363 process_needs_restart = 0; 364 service_for_each_flags(SVC_RESTARTING, 365 restart_service_if_needed); 366} 367 368static void msg_start(const char *name) 369{ 370 struct service *svc; 371 char *tmp = NULL; 372 char *args = NULL; 373 374 if (!strchr(name, ':')) 375 svc = service_find_by_name(name); 376 else { 377 tmp = strdup(name); 378 args = strchr(tmp, ':'); 379 *args = '\0'; 380 args++; 381 382 svc = service_find_by_name(tmp); 383 } 384 385 if (svc) { 386 service_start(svc, args); 387 } else { 388 ERROR("no such service '%s'\n", name); 389 } 390 if (tmp) 391 free(tmp); 392} 393 394static void msg_stop(const char *name) 395{ 396 struct service *svc = service_find_by_name(name); 397 398 if (svc) { 399 service_stop(svc); 400 } else { 401 ERROR("no such service '%s'\n", name); 402 } 403} 404 405void handle_control_message(const char *msg, const char *arg) 406{ 407 if (!strcmp(msg,"start")) { 408 msg_start(arg); 409 } else if (!strcmp(msg,"stop")) { 410 msg_stop(arg); 411 } else if (!strcmp(msg,"restart")) { 412 msg_stop(arg); 413 msg_start(arg); 414 } else { 415 ERROR("unknown control msg '%s'\n", msg); 416 } 417} 418 419static void import_kernel_nv(char *name, int in_qemu) 420{ 421 char *value = strchr(name, '='); 422 423 if (value == 0) return; 424 *value++ = 0; 425 if (*name == 0) return; 426 427 if (!in_qemu) 428 { 429 /* on a real device, white-list the kernel options */ 430 if (!strcmp(name,"qemu")) { 431 strlcpy(qemu, value, sizeof(qemu)); 432 } else if (!strcmp(name,"androidboot.console")) { 433 strlcpy(console, value, sizeof(console)); 434 } else if (!strcmp(name,"androidboot.mode")) { 435 strlcpy(bootmode, value, sizeof(bootmode)); 436 } else if (!strcmp(name,"androidboot.serialno")) { 437 strlcpy(serialno, value, sizeof(serialno)); 438 } else if (!strcmp(name,"androidboot.baseband")) { 439 strlcpy(baseband, value, sizeof(baseband)); 440 } else if (!strcmp(name,"androidboot.carrier")) { 441 strlcpy(carrier, value, sizeof(carrier)); 442 } else if (!strcmp(name,"androidboot.bootloader")) { 443 strlcpy(bootloader, value, sizeof(bootloader)); 444 } else if (!strcmp(name,"androidboot.hardware")) { 445 strlcpy(hardware, value, sizeof(hardware)); 446 } 447 } else { 448 /* in the emulator, export any kernel option with the 449 * ro.kernel. prefix */ 450 char buff[32]; 451 int len = snprintf( buff, sizeof(buff), "ro.kernel.%s", name ); 452 if (len < (int)sizeof(buff)) { 453 property_set( buff, value ); 454 } 455 } 456} 457 458static void import_kernel_cmdline(int in_qemu) 459{ 460 char cmdline[1024]; 461 char *ptr; 462 int fd; 463 464 fd = open("/proc/cmdline", O_RDONLY); 465 if (fd >= 0) { 466 int n = read(fd, cmdline, 1023); 467 if (n < 0) n = 0; 468 469 /* get rid of trailing newline, it happens */ 470 if (n > 0 && cmdline[n-1] == '\n') n--; 471 472 cmdline[n] = 0; 473 close(fd); 474 } else { 475 cmdline[0] = 0; 476 } 477 478 ptr = cmdline; 479 while (ptr && *ptr) { 480 char *x = strchr(ptr, ' '); 481 if (x != 0) *x++ = 0; 482 import_kernel_nv(ptr, in_qemu); 483 ptr = x; 484 } 485 486 /* don't expose the raw commandline to nonpriv processes */ 487 chmod("/proc/cmdline", 0440); 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) 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 property_init_action(int nargs, char **args) 550{ 551 INFO("property init\n"); 552 property_init(); 553 return 0; 554} 555 556static int keychord_init_action(int nargs, char **args) 557{ 558 keychord_init(); 559 return 0; 560} 561 562static int console_init_action(int nargs, char **args) 563{ 564 int fd; 565 char tmp[PROP_VALUE_MAX]; 566 567 if (console[0]) { 568 snprintf(tmp, sizeof(tmp), "/dev/%s", console); 569 console_name = strdup(tmp); 570 } 571 572 fd = open(console_name, O_RDWR); 573 if (fd >= 0) 574 have_console = 1; 575 close(fd); 576 577 if( load_565rle_image(INIT_IMAGE_FILE) ) { 578 fd = open("/dev/tty0", O_WRONLY); 579 if (fd >= 0) { 580 const char *msg; 581 msg = "\n" 582 "\n" 583 "\n" 584 "\n" 585 "\n" 586 "\n" 587 "\n" // console is 40 cols x 30 lines 588 "\n" 589 "\n" 590 "\n" 591 "\n" 592 "\n" 593 "\n" 594 "\n" 595 " A N D R O I D "; 596 write(fd, msg, strlen(msg)); 597 close(fd); 598 } 599 } 600 return 0; 601} 602 603static int set_init_properties_action(int nargs, char **args) 604{ 605 char tmp[PROP_VALUE_MAX]; 606 607 if (qemu[0]) 608 import_kernel_cmdline(1); 609 610 if (!strcmp(bootmode,"factory")) 611 property_set("ro.factorytest", "1"); 612 else if (!strcmp(bootmode,"factory2")) 613 property_set("ro.factorytest", "2"); 614 else 615 property_set("ro.factorytest", "0"); 616 617 property_set("ro.serialno", serialno[0] ? serialno : ""); 618 property_set("ro.bootmode", bootmode[0] ? bootmode : "unknown"); 619 property_set("ro.baseband", baseband[0] ? baseband : "unknown"); 620 property_set("ro.carrier", carrier[0] ? carrier : "unknown"); 621 property_set("ro.bootloader", bootloader[0] ? bootloader : "unknown"); 622 623 property_set("ro.hardware", hardware); 624 snprintf(tmp, PROP_VALUE_MAX, "%d", revision); 625 property_set("ro.revision", tmp); 626 return 0; 627} 628 629static int property_service_init_action(int nargs, char **args) 630{ 631 /* read any property files on system or data and 632 * fire up the property service. This must happen 633 * after the ro.foo properties are set above so 634 * that /data/local.prop cannot interfere with them. 635 */ 636 start_property_service(); 637 return 0; 638} 639 640static int signal_init_action(int nargs, char **args) 641{ 642 signal_init(); 643 return 0; 644} 645 646static int check_startup_action(int nargs, char **args) 647{ 648 /* make sure we actually have all the pieces we need */ 649 if ((get_property_set_fd() < 0) || 650 (get_signal_fd() < 0)) { 651 ERROR("init startup failure\n"); 652 exit(1); 653 } 654 return 0; 655} 656 657static int queue_property_triggers_action(int nargs, char **args) 658{ 659 queue_all_property_triggers(); 660 /* enable property triggers */ 661 property_triggers_enabled = 1; 662 return 0; 663} 664 665#if BOOTCHART 666static int bootchart_init_action(int nargs, char **args) 667{ 668 bootchart_count = bootchart_init(); 669 if (bootchart_count < 0) { 670 ERROR("bootcharting init failure\n"); 671 } else if (bootchart_count > 0) { 672 NOTICE("bootcharting started (period=%d ms)\n", bootchart_count*BOOTCHART_POLLING_MS); 673 } else { 674 NOTICE("bootcharting ignored\n"); 675 } 676 677 return 0; 678} 679#endif 680 681int main(int argc, char **argv) 682{ 683 int fd_count = 0; 684 struct pollfd ufds[4]; 685 char *tmpdev; 686 char* debuggable; 687 char tmp[32]; 688 int property_set_fd_init = 0; 689 int signal_fd_init = 0; 690 int keychord_fd_init = 0; 691 692 if (!strcmp(basename(argv[0]), "ueventd")) 693 return ueventd_main(argc, argv); 694 695 /* clear the umask */ 696 umask(0); 697 698 /* Get the basic filesystem setup we need put 699 * together in the initramdisk on / and then we'll 700 * let the rc file figure out the rest. 701 */ 702 mkdir("/dev", 0755); 703 mkdir("/proc", 0755); 704 mkdir("/sys", 0755); 705 706 mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755"); 707 mkdir("/dev/pts", 0755); 708 mkdir("/dev/socket", 0755); 709 mount("devpts", "/dev/pts", "devpts", 0, NULL); 710 mount("proc", "/proc", "proc", 0, NULL); 711 mount("sysfs", "/sys", "sysfs", 0, NULL); 712 713 /* We must have some place other than / to create the 714 * device nodes for kmsg and null, otherwise we won't 715 * be able to remount / read-only later on. 716 * Now that tmpfs is mounted on /dev, we can actually 717 * talk to the outside world. 718 */ 719 open_devnull_stdio(); 720 log_init(); 721 722 INFO("reading config file\n"); 723 init_parse_config_file("/init.rc"); 724 725 /* pull the kernel commandline and ramdisk properties file in */ 726 import_kernel_cmdline(0); 727 728 get_hardware_name(hardware, &revision); 729 snprintf(tmp, sizeof(tmp), "/init.%s.rc", hardware); 730 init_parse_config_file(tmp); 731 732 action_for_each_trigger("early-init", action_add_queue_tail); 733 734 queue_builtin_action(wait_for_coldboot_done_action, "wait_for_coldboot_done"); 735 queue_builtin_action(property_init_action, "property_init"); 736 queue_builtin_action(keychord_init_action, "keychord_init"); 737 queue_builtin_action(console_init_action, "console_init"); 738 queue_builtin_action(set_init_properties_action, "set_init_properties"); 739 740 /* execute all the boot actions to get us started */ 741 action_for_each_trigger("init", action_add_queue_tail); 742 action_for_each_trigger("early-fs", action_add_queue_tail); 743 action_for_each_trigger("fs", action_add_queue_tail); 744 action_for_each_trigger("post-fs", action_add_queue_tail); 745 action_for_each_trigger("post-fs-data", action_add_queue_tail); 746 747 queue_builtin_action(property_service_init_action, "property_service_init"); 748 queue_builtin_action(signal_init_action, "signal_init"); 749 queue_builtin_action(check_startup_action, "check_startup"); 750 751 /* execute all the boot actions to get us started */ 752 action_for_each_trigger("early-boot", action_add_queue_tail); 753 action_for_each_trigger("boot", action_add_queue_tail); 754 755 /* run all property triggers based on current state of the properties */ 756 queue_builtin_action(queue_property_triggers_action, "queue_propety_triggers"); 757 758 759#if BOOTCHART 760 queue_builtin_action(bootchart_init_action, "bootchart_init"); 761#endif 762 763 for(;;) { 764 int nr, i, timeout = -1; 765 766 execute_one_command(); 767 restart_processes(); 768 769 if (!property_set_fd_init && get_property_set_fd() > 0) { 770 ufds[fd_count].fd = get_property_set_fd(); 771 ufds[fd_count].events = POLLIN; 772 ufds[fd_count].revents = 0; 773 fd_count++; 774 property_set_fd_init = 1; 775 } 776 if (!signal_fd_init && get_signal_fd() > 0) { 777 ufds[fd_count].fd = get_signal_fd(); 778 ufds[fd_count].events = POLLIN; 779 ufds[fd_count].revents = 0; 780 fd_count++; 781 signal_fd_init = 1; 782 } 783 if (!keychord_fd_init && get_keychord_fd() > 0) { 784 ufds[fd_count].fd = get_keychord_fd(); 785 ufds[fd_count].events = POLLIN; 786 ufds[fd_count].revents = 0; 787 fd_count++; 788 keychord_fd_init = 1; 789 } 790 791 if (process_needs_restart) { 792 timeout = (process_needs_restart - gettime()) * 1000; 793 if (timeout < 0) 794 timeout = 0; 795 } 796 797 if (!action_queue_empty() || cur_action) 798 timeout = 0; 799 800#if BOOTCHART 801 if (bootchart_count > 0) { 802 if (timeout < 0 || timeout > BOOTCHART_POLLING_MS) 803 timeout = BOOTCHART_POLLING_MS; 804 if (bootchart_step() < 0 || --bootchart_count == 0) { 805 bootchart_finish(); 806 bootchart_count = 0; 807 } 808 } 809#endif 810 811 nr = poll(ufds, fd_count, timeout); 812 if (nr <= 0) 813 continue; 814 815 for (i = 0; i < fd_count; i++) { 816 if (ufds[i].revents == POLLIN) { 817 if (ufds[i].fd == get_property_set_fd()) 818 handle_property_set_fd(); 819 else if (ufds[i].fd == get_keychord_fd()) 820 handle_keychord(); 821 else if (ufds[i].fd == get_signal_fd()) 822 handle_signal(); 823 } 824 } 825 } 826 827 return 0; 828} 829