init.c revision 01c76f540054b3f5849da1d557fd2c477b876356 
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/list.h>
37#include <cutils/sockets.h>
38#include <cutils/iosched_policy.h>
39#include <private/android_filesystem_config.h>
40#include <termios.h>
41
42#include <sys/system_properties.h>
43
44#include "devices.h"
45#include "init.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 char modelno[32];
69static unsigned revision = 0;
70static char qemu[32];
71
72static struct action *cur_action = NULL;
73static struct command *cur_command = NULL;
74static struct listnode *command_queue = NULL;
75
76void notify_service_state(const char *name, const char *state)
77{
78    char pname[PROP_NAME_MAX];
79    int len = strlen(name);
80    if ((len + 10) > PROP_NAME_MAX)
81        return;
82    snprintf(pname, sizeof(pname), "init.svc.%s", name);
83    property_set(pname, state);
84}
85
86static int have_console;
87static char *console_name = "/dev/console";
88static time_t process_needs_restart;
89
90static const char *ENV[32];
91
92/* add_environment - add "key=value" to the current environment */
93int add_environment(const char *key, const char *val)
94{
95    int n;
96
97    for (n = 0; n < 31; n++) {
98        if (!ENV[n]) {
99            size_t len = strlen(key) + strlen(val) + 2;
100            char *entry = malloc(len);
101            snprintf(entry, len, "%s=%s", key, val);
102            ENV[n] = entry;
103            return 0;
104        }
105    }
106
107    return 1;
108}
109
110static void zap_stdio(void)
111{
112    int fd;
113    fd = open("/dev/null", O_RDWR);
114    dup2(fd, 0);
115    dup2(fd, 1);
116    dup2(fd, 2);
117    close(fd);
118}
119
120static void open_console()
121{
122    int fd;
123    if ((fd = open(console_name, O_RDWR)) < 0) {
124        fd = open("/dev/null", O_RDWR);
125    }
126    dup2(fd, 0);
127    dup2(fd, 1);
128    dup2(fd, 2);
129    close(fd);
130}
131
132static void publish_socket(const char *name, int fd)
133{
134    char key[64] = ANDROID_SOCKET_ENV_PREFIX;
135    char val[64];
136
137    strlcpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1,
138            name,
139            sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX));
140    snprintf(val, sizeof(val), "%d", fd);
141    add_environment(key, val);
142
143    /* make sure we don't close-on-exec */
144    fcntl(fd, F_SETFD, 0);
145}
146
147void service_start(struct service *svc, const char *dynamic_args)
148{
149    struct stat s;
150    pid_t pid;
151    int needs_console;
152    int n;
153
154        /* starting a service removes it from the disabled or reset
155         * state and immediately takes it out of the restarting
156         * state if it was in there
157         */
158    svc->flags &= (~(SVC_DISABLED|SVC_RESTARTING|SVC_RESET));
159    svc->time_started = 0;
160
161        /* running processes require no additional work -- if
162         * they're in the process of exiting, we've ensured
163         * that they will immediately restart on exit, unless
164         * they are ONESHOT
165         */
166    if (svc->flags & SVC_RUNNING) {
167        return;
168    }
169
170    needs_console = (svc->flags & SVC_CONSOLE) ? 1 : 0;
171    if (needs_console && (!have_console)) {
172        ERROR("service '%s' requires console\n", svc->name);
173        svc->flags |= SVC_DISABLED;
174        return;
175    }
176
177    if (stat(svc->args[0], &s) != 0) {
178        ERROR("cannot find '%s', disabling '%s'\n", svc->args[0], svc->name);
179        svc->flags |= SVC_DISABLED;
180        return;
181    }
182
183    if ((!(svc->flags & SVC_ONESHOT)) && dynamic_args) {
184        ERROR("service '%s' must be one-shot to use dynamic args, disabling\n",
185               svc->args[0]);
186        svc->flags |= SVC_DISABLED;
187        return;
188    }
189
190    NOTICE("starting '%s'\n", svc->name);
191
192    pid = fork();
193
194    if (pid == 0) {
195        struct socketinfo *si;
196        struct svcenvinfo *ei;
197        char tmp[32];
198        int fd, sz;
199
200        if (properties_inited()) {
201            get_property_workspace(&fd, &sz);
202            sprintf(tmp, "%d,%d", dup(fd), sz);
203            add_environment("ANDROID_PROPERTY_WORKSPACE", tmp);
204        }
205
206        for (ei = svc->envvars; ei; ei = ei->next)
207            add_environment(ei->name, ei->value);
208
209        for (si = svc->sockets; si; si = si->next) {
210            int socket_type = (
211                    !strcmp(si->type, "stream") ? SOCK_STREAM :
212                        (!strcmp(si->type, "dgram") ? SOCK_DGRAM : SOCK_SEQPACKET));
213            int s = create_socket(si->name, socket_type,
214                                  si->perm, si->uid, si->gid);
215            if (s >= 0) {
216                publish_socket(si->name, s);
217            }
218        }
219
220        if (svc->ioprio_class != IoSchedClass_NONE) {
221            if (android_set_ioprio(getpid(), svc->ioprio_class, svc->ioprio_pri)) {
222                ERROR("Failed to set pid %d ioprio = %d,%d: %s\n",
223                      getpid(), svc->ioprio_class, svc->ioprio_pri, strerror(errno));
224            }
225        }
226
227        if (needs_console) {
228            setsid();
229            open_console();
230        } else {
231            zap_stdio();
232        }
233
234#if 0
235        for (n = 0; svc->args[n]; n++) {
236            INFO("args[%d] = '%s'\n", n, svc->args[n]);
237        }
238        for (n = 0; ENV[n]; n++) {
239            INFO("env[%d] = '%s'\n", n, ENV[n]);
240        }
241#endif
242
243        setpgid(0, getpid());
244
245    /* as requested, set our gid, supplemental gids, and uid */
246        if (svc->gid) {
247            if (setgid(svc->gid) != 0) {
248                ERROR("setgid failed: %s\n", strerror(errno));
249                _exit(127);
250            }
251        }
252        if (svc->nr_supp_gids) {
253            if (setgroups(svc->nr_supp_gids, svc->supp_gids) != 0) {
254                ERROR("setgroups failed: %s\n", strerror(errno));
255                _exit(127);
256            }
257        }
258        if (svc->uid) {
259            if (setuid(svc->uid) != 0) {
260                ERROR("setuid failed: %s\n", strerror(errno));
261                _exit(127);
262            }
263        }
264
265        if (!dynamic_args) {
266            if (execve(svc->args[0], (char**) svc->args, (char**) ENV) < 0) {
267                ERROR("cannot execve('%s'): %s\n", svc->args[0], strerror(errno));
268            }
269        } else {
270            char *arg_ptrs[INIT_PARSER_MAXARGS+1];
271            int arg_idx = svc->nargs;
272            char *tmp = strdup(dynamic_args);
273            char *next = tmp;
274            char *bword;
275
276            /* Copy the static arguments */
277            memcpy(arg_ptrs, svc->args, (svc->nargs * sizeof(char *)));
278
279            while((bword = strsep(&next, " "))) {
280                arg_ptrs[arg_idx++] = bword;
281                if (arg_idx == INIT_PARSER_MAXARGS)
282                    break;
283            }
284            arg_ptrs[arg_idx] = '\0';
285            execve(svc->args[0], (char**) arg_ptrs, (char**) ENV);
286        }
287        _exit(127);
288    }
289
290    if (pid < 0) {
291        ERROR("failed to start '%s'\n", svc->name);
292        svc->pid = 0;
293        return;
294    }
295
296    svc->time_started = gettime();
297    svc->pid = pid;
298    svc->flags |= SVC_RUNNING;
299
300    if (properties_inited())
301        notify_service_state(svc->name, "running");
302}
303
304/* The how field should be either SVC_DISABLED or SVC_RESET */
305static void service_stop_or_reset(struct service *svc, int how)
306{
307        /* we are no longer running, nor should we
308         * attempt to restart
309         */
310    svc->flags &= (~(SVC_RUNNING|SVC_RESTARTING));
311
312    if ((how != SVC_DISABLED) && (how != SVC_RESET)) {
313        /* Hrm, an illegal flag.  Default to SVC_DISABLED */
314        how = SVC_DISABLED;
315    }
316        /* if the service has not yet started, prevent
317         * it from auto-starting with its class
318         */
319    if (how == SVC_RESET) {
320        svc->flags |= (svc->flags & SVC_RC_DISABLED) ? SVC_DISABLED : SVC_RESET;
321    } else {
322        svc->flags |= how;
323    }
324
325    if (svc->pid) {
326        NOTICE("service '%s' is being killed\n", svc->name);
327        kill(-svc->pid, SIGKILL);
328        notify_service_state(svc->name, "stopping");
329    } else {
330        notify_service_state(svc->name, "stopped");
331    }
332}
333
334void service_reset(struct service *svc)
335{
336    service_stop_or_reset(svc, SVC_RESET);
337}
338
339void service_stop(struct service *svc)
340{
341    service_stop_or_reset(svc, SVC_DISABLED);
342}
343
344void property_changed(const char *name, const char *value)
345{
346    if (property_triggers_enabled)
347        queue_property_triggers(name, value);
348}
349
350static void restart_service_if_needed(struct service *svc)
351{
352    time_t next_start_time = svc->time_started + 5;
353
354    if (next_start_time <= gettime()) {
355        svc->flags &= (~SVC_RESTARTING);
356        service_start(svc, NULL);
357        return;
358    }
359
360    if ((next_start_time < process_needs_restart) ||
361        (process_needs_restart == 0)) {
362        process_needs_restart = next_start_time;
363    }
364}
365
366static void restart_processes()
367{
368    process_needs_restart = 0;
369    service_for_each_flags(SVC_RESTARTING,
370                           restart_service_if_needed);
371}
372
373static void msg_start(const char *name)
374{
375    struct service *svc;
376    char *tmp = NULL;
377    char *args = NULL;
378
379    if (!strchr(name, ':'))
380        svc = service_find_by_name(name);
381    else {
382        tmp = strdup(name);
383        args = strchr(tmp, ':');
384        *args = '\0';
385        args++;
386
387        svc = service_find_by_name(tmp);
388    }
389
390    if (svc) {
391        service_start(svc, args);
392    } else {
393        ERROR("no such service '%s'\n", name);
394    }
395    if (tmp)
396        free(tmp);
397}
398
399static void msg_stop(const char *name)
400{
401    struct service *svc = service_find_by_name(name);
402
403    if (svc) {
404        service_stop(svc);
405    } else {
406        ERROR("no such service '%s'\n", name);
407    }
408}
409
410void handle_control_message(const char *msg, const char *arg)
411{
412    if (!strcmp(msg,"start")) {
413        msg_start(arg);
414    } else if (!strcmp(msg,"stop")) {
415        msg_stop(arg);
416    } else if (!strcmp(msg,"restart")) {
417        msg_stop(arg);
418        msg_start(arg);
419    } else {
420        ERROR("unknown control msg '%s'\n", msg);
421    }
422}
423
424static void import_kernel_nv(char *name, int in_qemu)
425{
426    char *value = strchr(name, '=');
427
428    if (value == 0) return;
429    *value++ = 0;
430    if (*name == 0) return;
431
432    if (!in_qemu)
433    {
434        /* on a real device, white-list the kernel options */
435        if (!strcmp(name,"qemu")) {
436            strlcpy(qemu, value, sizeof(qemu));
437        } else if (!strcmp(name,"androidboot.console")) {
438            strlcpy(console, value, sizeof(console));
439        } else if (!strcmp(name,"androidboot.mode")) {
440            strlcpy(bootmode, value, sizeof(bootmode));
441        } else if (!strcmp(name,"androidboot.serialno")) {
442            strlcpy(serialno, value, sizeof(serialno));
443        } else if (!strcmp(name,"androidboot.baseband")) {
444            strlcpy(baseband, value, sizeof(baseband));
445        } else if (!strcmp(name,"androidboot.carrier")) {
446            strlcpy(carrier, value, sizeof(carrier));
447        } else if (!strcmp(name,"androidboot.bootloader")) {
448            strlcpy(bootloader, value, sizeof(bootloader));
449        } else if (!strcmp(name,"androidboot.hardware")) {
450            strlcpy(hardware, value, sizeof(hardware));
451        } else if (!strcmp(name,"androidboot.modelno")) {
452            strlcpy(modelno, value, sizeof(modelno));
453        }
454    } else {
455        /* in the emulator, export any kernel option with the
456         * ro.kernel. prefix */
457        char  buff[32];
458        int   len = snprintf( buff, sizeof(buff), "ro.kernel.%s", name );
459        if (len < (int)sizeof(buff)) {
460            property_set( buff, value );
461        }
462    }
463}
464
465static struct command *get_first_command(struct action *act)
466{
467    struct listnode *node;
468    node = list_head(&act->commands);
469    if (!node || list_empty(&act->commands))
470        return NULL;
471
472    return node_to_item(node, struct command, clist);
473}
474
475static struct command *get_next_command(struct action *act, struct command *cmd)
476{
477    struct listnode *node;
478    node = cmd->clist.next;
479    if (!node)
480        return NULL;
481    if (node == &act->commands)
482        return NULL;
483
484    return node_to_item(node, struct command, clist);
485}
486
487static int is_last_command(struct action *act, struct command *cmd)
488{
489    return (list_tail(&act->commands) == &cmd->clist);
490}
491
492void execute_one_command(void)
493{
494    int ret;
495
496    if (!cur_action || !cur_command || is_last_command(cur_action, cur_command)) {
497        cur_action = action_remove_queue_head();
498        cur_command = NULL;
499        if (!cur_action)
500            return;
501        INFO("processing action %p (%s)\n", cur_action, cur_action->name);
502        cur_command = get_first_command(cur_action);
503    } else {
504        cur_command = get_next_command(cur_action, cur_command);
505    }
506
507    if (!cur_command)
508        return;
509
510    ret = cur_command->func(cur_command->nargs, cur_command->args);
511    INFO("command '%s' r=%d\n", cur_command->args[0], ret);
512}
513
514static int wait_for_coldboot_done_action(int nargs, char **args)
515{
516    int ret;
517    INFO("wait for %s\n", coldboot_done);
518    ret = wait_for_file(coldboot_done, COMMAND_RETRY_TIMEOUT);
519    if (ret)
520        ERROR("Timed out waiting for %s\n", coldboot_done);
521    return ret;
522}
523
524static int property_init_action(int nargs, char **args)
525{
526    bool load_defaults = true;
527
528    INFO("property init\n");
529    if (!strcmp(bootmode, "charger"))
530        load_defaults = false;
531    property_init(load_defaults);
532    return 0;
533}
534
535static int keychord_init_action(int nargs, char **args)
536{
537    keychord_init();
538    return 0;
539}
540
541static int console_init_action(int nargs, char **args)
542{
543    int fd;
544    char tmp[PROP_VALUE_MAX];
545
546    if (console[0]) {
547        snprintf(tmp, sizeof(tmp), "/dev/%s", console);
548        console_name = strdup(tmp);
549    }
550
551    fd = open(console_name, O_RDWR);
552    if (fd >= 0)
553        have_console = 1;
554    close(fd);
555
556    if( load_565rle_image(INIT_IMAGE_FILE) ) {
557        fd = open("/dev/tty0", O_WRONLY);
558        if (fd >= 0) {
559            const char *msg;
560                msg = "\n"
561            "\n"
562            "\n"
563            "\n"
564            "\n"
565            "\n"
566            "\n"  // console is 40 cols x 30 lines
567            "\n"
568            "\n"
569            "\n"
570            "\n"
571            "\n"
572            "\n"
573            "\n"
574            "             A N D R O I D ";
575            write(fd, msg, strlen(msg));
576            close(fd);
577        }
578    }
579    return 0;
580}
581
582static int set_init_properties_action(int nargs, char **args)
583{
584    char tmp[PROP_VALUE_MAX];
585
586    if (qemu[0])
587        import_kernel_cmdline(1, import_kernel_nv);
588
589    if (!strcmp(bootmode,"factory"))
590        property_set("ro.factorytest", "1");
591    else if (!strcmp(bootmode,"factory2"))
592        property_set("ro.factorytest", "2");
593    else
594        property_set("ro.factorytest", "0");
595
596    property_set("ro.serialno", serialno[0] ? serialno : "");
597    property_set("ro.bootmode", bootmode[0] ? bootmode : "unknown");
598    property_set("ro.baseband", baseband[0] ? baseband : "unknown");
599    property_set("ro.carrier", carrier[0] ? carrier : "unknown");
600    property_set("ro.bootloader", bootloader[0] ? bootloader : "unknown");
601
602    if (modelno[0])
603        property_set("ro.boot.modelno", modelno);
604
605    property_set("ro.hardware", hardware);
606    snprintf(tmp, PROP_VALUE_MAX, "%d", revision);
607    property_set("ro.revision", tmp);
608    return 0;
609}
610
611static int property_service_init_action(int nargs, char **args)
612{
613    /* read any property files on system or data and
614     * fire up the property service.  This must happen
615     * after the ro.foo properties are set above so
616     * that /data/local.prop cannot interfere with them.
617     */
618    start_property_service();
619    return 0;
620}
621
622static int signal_init_action(int nargs, char **args)
623{
624    signal_init();
625    return 0;
626}
627
628static int check_startup_action(int nargs, char **args)
629{
630    /* make sure we actually have all the pieces we need */
631    if ((get_property_set_fd() < 0) ||
632        (get_signal_fd() < 0)) {
633        ERROR("init startup failure\n");
634        exit(1);
635    }
636
637        /* signal that we hit this point */
638    unlink("/dev/.booting");
639
640    return 0;
641}
642
643static int queue_property_triggers_action(int nargs, char **args)
644{
645    queue_all_property_triggers();
646    /* enable property triggers */
647    property_triggers_enabled = 1;
648    return 0;
649}
650
651#if BOOTCHART
652static int bootchart_init_action(int nargs, char **args)
653{
654    bootchart_count = bootchart_init();
655    if (bootchart_count < 0) {
656        ERROR("bootcharting init failure\n");
657    } else if (bootchart_count > 0) {
658        NOTICE("bootcharting started (period=%d ms)\n", bootchart_count*BOOTCHART_POLLING_MS);
659    } else {
660        NOTICE("bootcharting ignored\n");
661    }
662
663    return 0;
664}
665#endif
666
667int main(int argc, char **argv)
668{
669    int fd_count = 0;
670    struct pollfd ufds[4];
671    char *tmpdev;
672    char* debuggable;
673    char tmp[32];
674    int property_set_fd_init = 0;
675    int signal_fd_init = 0;
676    int keychord_fd_init = 0;
677
678    if (!strcmp(basename(argv[0]), "ueventd"))
679        return ueventd_main(argc, argv);
680
681    /* clear the umask */
682    umask(0);
683
684        /* Get the basic filesystem setup we need put
685         * together in the initramdisk on / and then we'll
686         * let the rc file figure out the rest.
687         */
688    mkdir("/dev", 0755);
689    mkdir("/proc", 0755);
690    mkdir("/sys", 0755);
691
692    mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755");
693    mkdir("/dev/pts", 0755);
694    mkdir("/dev/socket", 0755);
695    mount("devpts", "/dev/pts", "devpts", 0, NULL);
696    mount("proc", "/proc", "proc", 0, NULL);
697    mount("sysfs", "/sys", "sysfs", 0, NULL);
698
699        /* indicate that booting is in progress to background fw loaders, etc */
700    close(open("/dev/.booting", O_WRONLY | O_CREAT, 0000));
701
702        /* We must have some place other than / to create the
703         * device nodes for kmsg and null, otherwise we won't
704         * be able to remount / read-only later on.
705         * Now that tmpfs is mounted on /dev, we can actually
706         * talk to the outside world.
707         */
708    open_devnull_stdio();
709    klog_init();
710
711    INFO("reading config file\n");
712    init_parse_config_file("/init.rc");
713
714    /* pull the kernel commandline and ramdisk properties file in */
715    import_kernel_cmdline(0, import_kernel_nv);
716    /* don't expose the raw commandline to nonpriv processes */
717    chmod("/proc/cmdline", 0440);
718    get_hardware_name(hardware, &revision);
719    snprintf(tmp, sizeof(tmp), "/init.%s.rc", hardware);
720    init_parse_config_file(tmp);
721
722    action_for_each_trigger("early-init", action_add_queue_tail);
723
724    queue_builtin_action(wait_for_coldboot_done_action, "wait_for_coldboot_done");
725    queue_builtin_action(property_init_action, "property_init");
726    queue_builtin_action(keychord_init_action, "keychord_init");
727    queue_builtin_action(console_init_action, "console_init");
728    queue_builtin_action(set_init_properties_action, "set_init_properties");
729
730    /* execute all the boot actions to get us started */
731    action_for_each_trigger("init", action_add_queue_tail);
732
733    /* skip mounting filesystems in charger mode */
734    if (strcmp(bootmode, "charger") != 0) {
735        action_for_each_trigger("early-fs", action_add_queue_tail);
736        action_for_each_trigger("fs", action_add_queue_tail);
737        action_for_each_trigger("post-fs", action_add_queue_tail);
738        action_for_each_trigger("post-fs-data", action_add_queue_tail);
739    }
740
741    queue_builtin_action(property_service_init_action, "property_service_init");
742    queue_builtin_action(signal_init_action, "signal_init");
743    queue_builtin_action(check_startup_action, "check_startup");
744
745    if (!strcmp(bootmode, "charger")) {
746        action_for_each_trigger("charger", action_add_queue_tail);
747    } else {
748        action_for_each_trigger("early-boot", action_add_queue_tail);
749        action_for_each_trigger("boot", action_add_queue_tail);
750    }
751
752        /* run all property triggers based on current state of the properties */
753    queue_builtin_action(queue_property_triggers_action, "queue_propety_triggers");
754
755
756#if BOOTCHART
757    queue_builtin_action(bootchart_init_action, "bootchart_init");
758#endif
759
760    for(;;) {
761        int nr, i, timeout = -1;
762
763        execute_one_command();
764        restart_processes();
765
766        if (!property_set_fd_init && get_property_set_fd() > 0) {
767            ufds[fd_count].fd = get_property_set_fd();
768            ufds[fd_count].events = POLLIN;
769            ufds[fd_count].revents = 0;
770            fd_count++;
771            property_set_fd_init = 1;
772        }
773        if (!signal_fd_init && get_signal_fd() > 0) {
774            ufds[fd_count].fd = get_signal_fd();
775            ufds[fd_count].events = POLLIN;
776            ufds[fd_count].revents = 0;
777            fd_count++;
778            signal_fd_init = 1;
779        }
780        if (!keychord_fd_init && get_keychord_fd() > 0) {
781            ufds[fd_count].fd = get_keychord_fd();
782            ufds[fd_count].events = POLLIN;
783            ufds[fd_count].revents = 0;
784            fd_count++;
785            keychord_fd_init = 1;
786        }
787
788        if (process_needs_restart) {
789            timeout = (process_needs_restart - gettime()) * 1000;
790            if (timeout < 0)
791                timeout = 0;
792        }
793
794        if (!action_queue_empty() || cur_action)
795            timeout = 0;
796
797#if BOOTCHART
798        if (bootchart_count > 0) {
799            if (timeout < 0 || timeout > BOOTCHART_POLLING_MS)
800                timeout = BOOTCHART_POLLING_MS;
801            if (bootchart_step() < 0 || --bootchart_count == 0) {
802                bootchart_finish();
803                bootchart_count = 0;
804            }
805        }
806#endif
807
808        nr = poll(ufds, fd_count, timeout);
809        if (nr <= 0)
810            continue;
811
812        for (i = 0; i < fd_count; i++) {
813            if (ufds[i].revents == POLLIN) {
814                if (ufds[i].fd == get_property_set_fd())
815                    handle_property_set_fd();
816                else if (ufds[i].fd == get_keychord_fd())
817                    handle_keychord();
818                else if (ufds[i].fd == get_signal_fd())
819                    handle_signal();
820            }
821        }
822    }
823
824    return 0;
825}
826