init.c revision d5c8ddfdf3f275226c02dc00ccbe63229acf6786
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 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)); 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 303void service_stop(struct service *svc) 304{ 305 /* we are no longer running, nor should we 306 * attempt to restart 307 */ 308 svc->flags &= (~(SVC_RUNNING|SVC_RESTARTING)); 309 310 /* if the service has not yet started, prevent 311 * it from auto-starting with its class 312 */ 313 svc->flags |= SVC_DISABLED; 314 315 if (svc->pid) { 316 NOTICE("service '%s' is being killed\n", svc->name); 317 kill(-svc->pid, SIGTERM); 318 notify_service_state(svc->name, "stopping"); 319 } else { 320 notify_service_state(svc->name, "stopped"); 321 } 322} 323 324void property_changed(const char *name, const char *value) 325{ 326 if (property_triggers_enabled) 327 queue_property_triggers(name, value); 328} 329 330static void restart_service_if_needed(struct service *svc) 331{ 332 time_t next_start_time = svc->time_started + 5; 333 334 if (next_start_time <= gettime()) { 335 svc->flags &= (~SVC_RESTARTING); 336 service_start(svc, NULL); 337 return; 338 } 339 340 if ((next_start_time < process_needs_restart) || 341 (process_needs_restart == 0)) { 342 process_needs_restart = next_start_time; 343 } 344} 345 346static void restart_processes() 347{ 348 process_needs_restart = 0; 349 service_for_each_flags(SVC_RESTARTING, 350 restart_service_if_needed); 351} 352 353static void msg_start(const char *name) 354{ 355 struct service *svc; 356 char *tmp = NULL; 357 char *args = NULL; 358 359 if (!strchr(name, ':')) 360 svc = service_find_by_name(name); 361 else { 362 tmp = strdup(name); 363 args = strchr(tmp, ':'); 364 *args = '\0'; 365 args++; 366 367 svc = service_find_by_name(tmp); 368 } 369 370 if (svc) { 371 service_start(svc, args); 372 } else { 373 ERROR("no such service '%s'\n", name); 374 } 375 if (tmp) 376 free(tmp); 377} 378 379static void msg_stop(const char *name) 380{ 381 struct service *svc = service_find_by_name(name); 382 383 if (svc) { 384 service_stop(svc); 385 } else { 386 ERROR("no such service '%s'\n", name); 387 } 388} 389 390void handle_control_message(const char *msg, const char *arg) 391{ 392 if (!strcmp(msg,"start")) { 393 msg_start(arg); 394 } else if (!strcmp(msg,"stop")) { 395 msg_stop(arg); 396 } else if (!strcmp(msg,"restart")) { 397 msg_stop(arg); 398 msg_start(arg); 399 } else { 400 ERROR("unknown control msg '%s'\n", msg); 401 } 402} 403 404static void import_kernel_nv(char *name, int in_qemu) 405{ 406 char *value = strchr(name, '='); 407 408 if (value == 0) return; 409 *value++ = 0; 410 if (*name == 0) return; 411 412 if (!in_qemu) 413 { 414 /* on a real device, white-list the kernel options */ 415 if (!strcmp(name,"qemu")) { 416 strlcpy(qemu, value, sizeof(qemu)); 417 } else if (!strcmp(name,"androidboot.console")) { 418 strlcpy(console, value, sizeof(console)); 419 } else if (!strcmp(name,"androidboot.mode")) { 420 strlcpy(bootmode, value, sizeof(bootmode)); 421 } else if (!strcmp(name,"androidboot.serialno")) { 422 strlcpy(serialno, value, sizeof(serialno)); 423 } else if (!strcmp(name,"androidboot.baseband")) { 424 strlcpy(baseband, value, sizeof(baseband)); 425 } else if (!strcmp(name,"androidboot.carrier")) { 426 strlcpy(carrier, value, sizeof(carrier)); 427 } else if (!strcmp(name,"androidboot.bootloader")) { 428 strlcpy(bootloader, value, sizeof(bootloader)); 429 } else if (!strcmp(name,"androidboot.hardware")) { 430 strlcpy(hardware, value, sizeof(hardware)); 431 } 432 } else { 433 /* in the emulator, export any kernel option with the 434 * ro.kernel. prefix */ 435 char buff[32]; 436 int len = snprintf( buff, sizeof(buff), "ro.kernel.%s", name ); 437 if (len < (int)sizeof(buff)) { 438 property_set( buff, value ); 439 } 440 } 441} 442 443static void import_kernel_cmdline(int in_qemu) 444{ 445 char cmdline[1024]; 446 char *ptr; 447 int fd; 448 449 fd = open("/proc/cmdline", O_RDONLY); 450 if (fd >= 0) { 451 int n = read(fd, cmdline, 1023); 452 if (n < 0) n = 0; 453 454 /* get rid of trailing newline, it happens */ 455 if (n > 0 && cmdline[n-1] == '\n') n--; 456 457 cmdline[n] = 0; 458 close(fd); 459 } else { 460 cmdline[0] = 0; 461 } 462 463 ptr = cmdline; 464 while (ptr && *ptr) { 465 char *x = strchr(ptr, ' '); 466 if (x != 0) *x++ = 0; 467 import_kernel_nv(ptr, in_qemu); 468 ptr = x; 469 } 470 471 /* don't expose the raw commandline to nonpriv processes */ 472 chmod("/proc/cmdline", 0440); 473} 474 475static struct command *get_first_command(struct action *act) 476{ 477 struct listnode *node; 478 node = list_head(&act->commands); 479 if (!node) 480 return NULL; 481 482 return node_to_item(node, struct command, clist); 483} 484 485static struct command *get_next_command(struct action *act, struct command *cmd) 486{ 487 struct listnode *node; 488 node = cmd->clist.next; 489 if (!node) 490 return NULL; 491 if (node == &act->commands) 492 return NULL; 493 494 return node_to_item(node, struct command, clist); 495} 496 497static int is_last_command(struct action *act, struct command *cmd) 498{ 499 return (list_tail(&act->commands) == &cmd->clist); 500} 501 502void execute_one_command(void) 503{ 504 int ret; 505 506 if (!cur_action || !cur_command || is_last_command(cur_action, cur_command)) { 507 cur_action = action_remove_queue_head(); 508 cur_command = NULL; 509 if (!cur_action) 510 return; 511 INFO("processing action %p (%s)\n", cur_action, cur_action->name); 512 cur_command = get_first_command(cur_action); 513 } else { 514 cur_command = get_next_command(cur_action, cur_command); 515 } 516 517 if (!cur_command) 518 return; 519 520 ret = cur_command->func(cur_command->nargs, cur_command->args); 521 INFO("command '%s' r=%d\n", cur_command->args[0], ret); 522} 523 524static int wait_for_coldboot_done_action(int nargs, char **args) 525{ 526 int ret; 527 INFO("wait for %s\n", coldboot_done); 528 ret = wait_for_file(coldboot_done, COMMAND_RETRY_TIMEOUT); 529 if (ret) 530 ERROR("Timed out waiting for %s\n", coldboot_done); 531 return ret; 532} 533 534static int property_init_action(int nargs, char **args) 535{ 536 INFO("property init\n"); 537 property_init(); 538 return 0; 539} 540 541static int keychord_init_action(int nargs, char **args) 542{ 543 keychord_init(); 544 return 0; 545} 546 547static int console_init_action(int nargs, char **args) 548{ 549 int fd; 550 char tmp[PROP_VALUE_MAX]; 551 552 if (console[0]) { 553 snprintf(tmp, sizeof(tmp), "/dev/%s", console); 554 console_name = strdup(tmp); 555 } 556 557 fd = open(console_name, O_RDWR); 558 if (fd >= 0) 559 have_console = 1; 560 close(fd); 561 562 if( load_565rle_image(INIT_IMAGE_FILE) ) { 563 fd = open("/dev/tty0", O_WRONLY); 564 if (fd >= 0) { 565 const char *msg; 566 msg = "\n" 567 "\n" 568 "\n" 569 "\n" 570 "\n" 571 "\n" 572 "\n" // console is 40 cols x 30 lines 573 "\n" 574 "\n" 575 "\n" 576 "\n" 577 "\n" 578 "\n" 579 "\n" 580 " A N D R O I D "; 581 write(fd, msg, strlen(msg)); 582 close(fd); 583 } 584 } 585 return 0; 586} 587 588static int set_init_properties_action(int nargs, char **args) 589{ 590 char tmp[PROP_VALUE_MAX]; 591 592 if (qemu[0]) 593 import_kernel_cmdline(1); 594 595 if (!strcmp(bootmode,"factory")) 596 property_set("ro.factorytest", "1"); 597 else if (!strcmp(bootmode,"factory2")) 598 property_set("ro.factorytest", "2"); 599 else 600 property_set("ro.factorytest", "0"); 601 602 property_set("ro.serialno", serialno[0] ? serialno : ""); 603 property_set("ro.bootmode", bootmode[0] ? bootmode : "unknown"); 604 property_set("ro.baseband", baseband[0] ? baseband : "unknown"); 605 property_set("ro.carrier", carrier[0] ? carrier : "unknown"); 606 property_set("ro.bootloader", bootloader[0] ? bootloader : "unknown"); 607 608 property_set("ro.hardware", hardware); 609 snprintf(tmp, PROP_VALUE_MAX, "%d", revision); 610 property_set("ro.revision", tmp); 611 return 0; 612} 613 614static int property_service_init_action(int nargs, char **args) 615{ 616 /* read any property files on system or data and 617 * fire up the property service. This must happen 618 * after the ro.foo properties are set above so 619 * that /data/local.prop cannot interfere with them. 620 */ 621 start_property_service(); 622 return 0; 623} 624 625static int signal_init_action(int nargs, char **args) 626{ 627 signal_init(); 628 return 0; 629} 630 631static int check_startup_action(int nargs, char **args) 632{ 633 /* make sure we actually have all the pieces we need */ 634 if ((get_property_set_fd() < 0) || 635 (get_signal_fd() < 0)) { 636 ERROR("init startup failure\n"); 637 exit(1); 638 } 639 return 0; 640} 641 642static int queue_property_triggers_action(int nargs, char **args) 643{ 644 queue_all_property_triggers(); 645 /* enable property triggers */ 646 property_triggers_enabled = 1; 647 return 0; 648} 649 650#if BOOTCHART 651static int bootchart_init_action(int nargs, char **args) 652{ 653 bootchart_count = bootchart_init(); 654 if (bootchart_count < 0) { 655 ERROR("bootcharting init failure\n"); 656 } else if (bootchart_count > 0) { 657 NOTICE("bootcharting started (period=%d ms)\n", bootchart_count*BOOTCHART_POLLING_MS); 658 } else { 659 NOTICE("bootcharting ignored\n"); 660 } 661} 662#endif 663 664int main(int argc, char **argv) 665{ 666 int fd_count = 0; 667 struct pollfd ufds[4]; 668 char *tmpdev; 669 char* debuggable; 670 char tmp[32]; 671 int property_set_fd_init = 0; 672 int signal_fd_init = 0; 673 int keychord_fd_init = 0; 674 675 if (!strcmp(basename(argv[0]), "ueventd")) 676 return ueventd_main(argc, argv); 677 678 /* clear the umask */ 679 umask(0); 680 681 /* Get the basic filesystem setup we need put 682 * together in the initramdisk on / and then we'll 683 * let the rc file figure out the rest. 684 */ 685 mkdir("/dev", 0755); 686 mkdir("/proc", 0755); 687 mkdir("/sys", 0755); 688 689 mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755"); 690 mkdir("/dev/pts", 0755); 691 mkdir("/dev/socket", 0755); 692 mount("devpts", "/dev/pts", "devpts", 0, NULL); 693 mount("proc", "/proc", "proc", 0, NULL); 694 mount("sysfs", "/sys", "sysfs", 0, NULL); 695 696 /* We must have some place other than / to create the 697 * device nodes for kmsg and null, otherwise we won't 698 * be able to remount / read-only later on. 699 * Now that tmpfs is mounted on /dev, we can actually 700 * talk to the outside world. 701 */ 702 open_devnull_stdio(); 703 log_init(); 704 705 INFO("reading config file\n"); 706 init_parse_config_file("/init.rc"); 707 708 /* pull the kernel commandline and ramdisk properties file in */ 709 import_kernel_cmdline(0); 710 711 get_hardware_name(hardware, &revision); 712 snprintf(tmp, sizeof(tmp), "/init.%s.rc", hardware); 713 init_parse_config_file(tmp); 714 715 action_for_each_trigger("early-init", action_add_queue_tail); 716 717 queue_builtin_action(wait_for_coldboot_done_action, "wait_for_coldboot_done"); 718 queue_builtin_action(property_init_action, "property_init"); 719 queue_builtin_action(keychord_init_action, "keychord_init"); 720 queue_builtin_action(console_init_action, "console_init"); 721 queue_builtin_action(set_init_properties_action, "set_init_properties"); 722 723 /* execute all the boot actions to get us started */ 724 action_for_each_trigger("init", action_add_queue_tail); 725 action_for_each_trigger("early-fs", action_add_queue_tail); 726 action_for_each_trigger("fs", action_add_queue_tail); 727 action_for_each_trigger("post-fs", action_add_queue_tail); 728 729 queue_builtin_action(property_service_init_action, "property_service_init"); 730 queue_builtin_action(signal_init_action, "signal_init"); 731 queue_builtin_action(check_startup_action, "check_startup"); 732 733 /* execute all the boot actions to get us started */ 734 action_for_each_trigger("early-boot", action_add_queue_tail); 735 action_for_each_trigger("boot", action_add_queue_tail); 736 737 /* run all property triggers based on current state of the properties */ 738 queue_builtin_action(queue_property_triggers_action, "queue_propety_triggers"); 739 740 741#if BOOTCHART 742 queue_builtin_action(bootchart_init_action, "bootchart_init"); 743#endif 744 745 for(;;) { 746 int nr, i, timeout = -1; 747 748 execute_one_command(); 749 restart_processes(); 750 751 if (!property_set_fd_init && get_property_set_fd() > 0) { 752 ufds[fd_count].fd = get_property_set_fd(); 753 ufds[fd_count].events = POLLIN; 754 ufds[fd_count].revents = 0; 755 fd_count++; 756 property_set_fd_init = 1; 757 } 758 if (!signal_fd_init && get_signal_fd() > 0) { 759 ufds[fd_count].fd = get_signal_fd(); 760 ufds[fd_count].events = POLLIN; 761 ufds[fd_count].revents = 0; 762 fd_count++; 763 signal_fd_init = 1; 764 } 765 if (!keychord_fd_init && get_keychord_fd() > 0) { 766 ufds[fd_count].fd = get_keychord_fd(); 767 ufds[fd_count].events = POLLIN; 768 ufds[fd_count].revents = 0; 769 fd_count++; 770 keychord_fd_init = 1; 771 } 772 773 if (process_needs_restart) { 774 timeout = (process_needs_restart - gettime()) * 1000; 775 if (timeout < 0) 776 timeout = 0; 777 } 778 779 if (!action_queue_empty() || cur_action) 780 timeout = 0; 781 782#if BOOTCHART 783 if (bootchart_count > 0) { 784 if (timeout < 0 || timeout > BOOTCHART_POLLING_MS) 785 timeout = BOOTCHART_POLLING_MS; 786 if (bootchart_step() < 0 || --bootchart_count == 0) { 787 bootchart_finish(); 788 bootchart_count = 0; 789 } 790 } 791#endif 792 793 nr = poll(ufds, fd_count, timeout); 794 if (nr <= 0) 795 continue; 796 797 for (i = 0; i < fd_count; i++) { 798 if (ufds[i].revents == POLLIN) { 799 if (ufds[i].fd == get_property_set_fd()) 800 handle_property_set_fd(); 801 else if (ufds[i].fd == get_keychord_fd()) 802 handle_keychord(); 803 else if (ufds[i].fd == get_signal_fd()) 804 handle_signal(); 805 } 806 } 807 } 808 809 return 0; 810} 811