init.c revision ebc6ff105a114ff5b5465e64fa0f3889730da19d 
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#include <cutils/sockets.h>
36#include <cutils/iosched_policy.h>
37#include <termios.h>
38
39#include <sys/system_properties.h>
40
41#include "devices.h"
42#include "init.h"
43#include "property_service.h"
44#include "bootchart.h"
45#include "signal_handler.h"
46#include "keychords.h"
47#include "parser.h"
48#include "util.h"
49
50static int property_triggers_enabled = 0;
51
52#if BOOTCHART
53static int   bootchart_count;
54#endif
55
56static char console[32];
57static char serialno[32];
58static char bootmode[32];
59static char baseband[32];
60static char carrier[32];
61static char bootloader[32];
62static char hardware[32];
63static unsigned revision = 0;
64static char qemu[32];
65
66static struct action *cur_action = NULL;
67static struct command *cur_command = NULL;
68static struct listnode *command_queue = NULL;
69
70void notify_service_state(const char *name, const char *state)
71{
72    char pname[PROP_NAME_MAX];
73    int len = strlen(name);
74    if ((len + 10) > PROP_NAME_MAX)
75        return;
76    snprintf(pname, sizeof(pname), "init.svc.%s", name);
77    property_set(pname, state);
78}
79
80static int have_console;
81static char *console_name = "/dev/console";
82static time_t process_needs_restart;
83
84static const char *ENV[32];
85
86/* add_environment - add "key=value" to the current environment */
87int add_environment(const char *key, const char *val)
88{
89    int n;
90
91    for (n = 0; n < 31; n++) {
92        if (!ENV[n]) {
93            size_t len = strlen(key) + strlen(val) + 2;
94            char *entry = malloc(len);
95            snprintf(entry, len, "%s=%s", key, val);
96            ENV[n] = entry;
97            return 0;
98        }
99    }
100
101    return 1;
102}
103
104static void zap_stdio(void)
105{
106    int fd;
107    fd = open("/dev/null", O_RDWR);
108    dup2(fd, 0);
109    dup2(fd, 1);
110    dup2(fd, 2);
111    close(fd);
112}
113
114static void open_console()
115{
116    int fd;
117    if ((fd = open(console_name, O_RDWR)) < 0) {
118        fd = open("/dev/null", O_RDWR);
119    }
120    dup2(fd, 0);
121    dup2(fd, 1);
122    dup2(fd, 2);
123    close(fd);
124}
125
126static void publish_socket(const char *name, int fd)
127{
128    char key[64] = ANDROID_SOCKET_ENV_PREFIX;
129    char val[64];
130
131    strlcpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1,
132            name,
133            sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX));
134    snprintf(val, sizeof(val), "%d", fd);
135    add_environment(key, val);
136
137    /* make sure we don't close-on-exec */
138    fcntl(fd, F_SETFD, 0);
139}
140
141void service_start(struct service *svc, const char *dynamic_args)
142{
143    struct stat s;
144    pid_t pid;
145    int needs_console;
146    int n;
147
148        /* starting a service removes it from the disabled
149         * state and immediately takes it out of the restarting
150         * state if it was in there
151         */
152    svc->flags &= (~(SVC_DISABLED|SVC_RESTARTING));
153    svc->time_started = 0;
154
155        /* running processes require no additional work -- if
156         * they're in the process of exiting, we've ensured
157         * that they will immediately restart on exit, unless
158         * they are ONESHOT
159         */
160    if (svc->flags & SVC_RUNNING) {
161        return;
162    }
163
164    needs_console = (svc->flags & SVC_CONSOLE) ? 1 : 0;
165    if (needs_console && (!have_console)) {
166        ERROR("service '%s' requires console\n", svc->name);
167        svc->flags |= SVC_DISABLED;
168        return;
169    }
170
171    if (stat(svc->args[0], &s) != 0) {
172        ERROR("cannot find '%s', disabling '%s'\n", svc->args[0], svc->name);
173        svc->flags |= SVC_DISABLED;
174        return;
175    }
176
177    if ((!(svc->flags & SVC_ONESHOT)) && dynamic_args) {
178        ERROR("service '%s' must be one-shot to use dynamic args, disabling\n",
179               svc->args[0]);
180        svc->flags |= SVC_DISABLED;
181        return;
182    }
183
184    NOTICE("starting '%s'\n", svc->name);
185
186    pid = fork();
187
188    if (pid == 0) {
189        struct socketinfo *si;
190        struct svcenvinfo *ei;
191        char tmp[32];
192        int fd, sz;
193
194        get_property_workspace(&fd, &sz);
195        sprintf(tmp, "%d,%d", dup(fd), sz);
196        add_environment("ANDROID_PROPERTY_WORKSPACE", tmp);
197
198        for (ei = svc->envvars; ei; ei = ei->next)
199            add_environment(ei->name, ei->value);
200
201        for (si = svc->sockets; si; si = si->next) {
202            int s = create_socket(si->name,
203                                  !strcmp(si->type, "dgram") ?
204                                  SOCK_DGRAM : SOCK_STREAM,
205                                  si->perm, si->uid, si->gid);
206            if (s >= 0) {
207                publish_socket(si->name, s);
208            }
209        }
210
211        if (svc->ioprio_class != IoSchedClass_NONE) {
212            if (android_set_ioprio(getpid(), svc->ioprio_class, svc->ioprio_pri)) {
213                ERROR("Failed to set pid %d ioprio = %d,%d: %s\n",
214                      getpid(), svc->ioprio_class, svc->ioprio_pri, strerror(errno));
215            }
216        }
217
218        if (needs_console) {
219            setsid();
220            open_console();
221        } else {
222            zap_stdio();
223        }
224
225#if 0
226        for (n = 0; svc->args[n]; n++) {
227            INFO("args[%d] = '%s'\n", n, svc->args[n]);
228        }
229        for (n = 0; ENV[n]; n++) {
230            INFO("env[%d] = '%s'\n", n, ENV[n]);
231        }
232#endif
233
234        setpgid(0, getpid());
235
236    /* as requested, set our gid, supplemental gids, and uid */
237        if (svc->gid) {
238            setgid(svc->gid);
239        }
240        if (svc->nr_supp_gids) {
241            setgroups(svc->nr_supp_gids, svc->supp_gids);
242        }
243        if (svc->uid) {
244            setuid(svc->uid);
245        }
246
247        if (!dynamic_args) {
248            if (execve(svc->args[0], (char**) svc->args, (char**) ENV) < 0) {
249                ERROR("cannot execve('%s'): %s\n", svc->args[0], strerror(errno));
250            }
251        } else {
252            char *arg_ptrs[SVC_MAXARGS+1];
253            int arg_idx = svc->nargs;
254            char *tmp = strdup(dynamic_args);
255            char *next = tmp;
256            char *bword;
257
258            /* Copy the static arguments */
259            memcpy(arg_ptrs, svc->args, (svc->nargs * sizeof(char *)));
260
261            while((bword = strsep(&next, " "))) {
262                arg_ptrs[arg_idx++] = bword;
263                if (arg_idx == SVC_MAXARGS)
264                    break;
265            }
266            arg_ptrs[arg_idx] = '\0';
267            execve(svc->args[0], (char**) arg_ptrs, (char**) ENV);
268        }
269        _exit(127);
270    }
271
272    if (pid < 0) {
273        ERROR("failed to start '%s'\n", svc->name);
274        svc->pid = 0;
275        return;
276    }
277
278    svc->time_started = gettime();
279    svc->pid = pid;
280    svc->flags |= SVC_RUNNING;
281
282    notify_service_state(svc->name, "running");
283}
284
285void service_stop(struct service *svc)
286{
287        /* we are no longer running, nor should we
288         * attempt to restart
289         */
290    svc->flags &= (~(SVC_RUNNING|SVC_RESTARTING));
291
292        /* if the service has not yet started, prevent
293         * it from auto-starting with its class
294         */
295    svc->flags |= SVC_DISABLED;
296
297    if (svc->pid) {
298        NOTICE("service '%s' is being killed\n", svc->name);
299        kill(-svc->pid, SIGTERM);
300        notify_service_state(svc->name, "stopping");
301    } else {
302        notify_service_state(svc->name, "stopped");
303    }
304}
305
306void property_changed(const char *name, const char *value)
307{
308    if (property_triggers_enabled)
309        queue_property_triggers(name, value);
310}
311
312static void restart_service_if_needed(struct service *svc)
313{
314    time_t next_start_time = svc->time_started + 5;
315
316    if (next_start_time <= gettime()) {
317        svc->flags &= (~SVC_RESTARTING);
318        service_start(svc, NULL);
319        return;
320    }
321
322    if ((next_start_time < process_needs_restart) ||
323        (process_needs_restart == 0)) {
324        process_needs_restart = next_start_time;
325    }
326}
327
328static void restart_processes()
329{
330    process_needs_restart = 0;
331    service_for_each_flags(SVC_RESTARTING,
332                           restart_service_if_needed);
333}
334
335static void msg_start(const char *name)
336{
337    struct service *svc;
338    char *tmp = NULL;
339    char *args = NULL;
340
341    if (!strchr(name, ':'))
342        svc = service_find_by_name(name);
343    else {
344        tmp = strdup(name);
345        args = strchr(tmp, ':');
346        *args = '\0';
347        args++;
348
349        svc = service_find_by_name(tmp);
350    }
351
352    if (svc) {
353        service_start(svc, args);
354    } else {
355        ERROR("no such service '%s'\n", name);
356    }
357    if (tmp)
358        free(tmp);
359}
360
361static void msg_stop(const char *name)
362{
363    struct service *svc = service_find_by_name(name);
364
365    if (svc) {
366        service_stop(svc);
367    } else {
368        ERROR("no such service '%s'\n", name);
369    }
370}
371
372void handle_control_message(const char *msg, const char *arg)
373{
374    if (!strcmp(msg,"start")) {
375        msg_start(arg);
376    } else if (!strcmp(msg,"stop")) {
377        msg_stop(arg);
378    } else {
379        ERROR("unknown control msg '%s'\n", msg);
380    }
381}
382
383static void import_kernel_nv(char *name, int in_qemu)
384{
385    char *value = strchr(name, '=');
386
387    if (value == 0) return;
388    *value++ = 0;
389    if (*name == 0) return;
390
391    if (!in_qemu)
392    {
393        /* on a real device, white-list the kernel options */
394        if (!strcmp(name,"qemu")) {
395            strlcpy(qemu, value, sizeof(qemu));
396        } else if (!strcmp(name,"androidboot.console")) {
397            strlcpy(console, value, sizeof(console));
398        } else if (!strcmp(name,"androidboot.mode")) {
399            strlcpy(bootmode, value, sizeof(bootmode));
400        } else if (!strcmp(name,"androidboot.serialno")) {
401            strlcpy(serialno, value, sizeof(serialno));
402        } else if (!strcmp(name,"androidboot.baseband")) {
403            strlcpy(baseband, value, sizeof(baseband));
404        } else if (!strcmp(name,"androidboot.carrier")) {
405            strlcpy(carrier, value, sizeof(carrier));
406        } else if (!strcmp(name,"androidboot.bootloader")) {
407            strlcpy(bootloader, value, sizeof(bootloader));
408        } else if (!strcmp(name,"androidboot.hardware")) {
409            strlcpy(hardware, value, sizeof(hardware));
410        } else {
411            qemu_cmdline(name, value);
412        }
413    } else {
414        /* in the emulator, export any kernel option with the
415         * ro.kernel. prefix */
416        char  buff[32];
417        int   len = snprintf( buff, sizeof(buff), "ro.kernel.%s", name );
418        if (len < (int)sizeof(buff)) {
419            property_set( buff, value );
420        }
421    }
422}
423
424static void import_kernel_cmdline(int in_qemu)
425{
426    char cmdline[1024];
427    char *ptr;
428    int fd;
429
430    fd = open("/proc/cmdline", O_RDONLY);
431    if (fd >= 0) {
432        int n = read(fd, cmdline, 1023);
433        if (n < 0) n = 0;
434
435        /* get rid of trailing newline, it happens */
436        if (n > 0 && cmdline[n-1] == '\n') n--;
437
438        cmdline[n] = 0;
439        close(fd);
440    } else {
441        cmdline[0] = 0;
442    }
443
444    ptr = cmdline;
445    while (ptr && *ptr) {
446        char *x = strchr(ptr, ' ');
447        if (x != 0) *x++ = 0;
448        import_kernel_nv(ptr, in_qemu);
449        ptr = x;
450    }
451
452        /* don't expose the raw commandline to nonpriv processes */
453    chmod("/proc/cmdline", 0440);
454}
455
456static void get_hardware_name(void)
457{
458    char data[1024];
459    int fd, n;
460    char *x, *hw, *rev;
461
462    /* Hardware string was provided on kernel command line */
463    if (hardware[0])
464        return;
465
466    fd = open("/proc/cpuinfo", O_RDONLY);
467    if (fd < 0) return;
468
469    n = read(fd, data, 1023);
470    close(fd);
471    if (n < 0) return;
472
473    data[n] = 0;
474    hw = strstr(data, "\nHardware");
475    rev = strstr(data, "\nRevision");
476
477    if (hw) {
478        x = strstr(hw, ": ");
479        if (x) {
480            x += 2;
481            n = 0;
482            while (*x && !isspace(*x)) {
483                hardware[n++] = tolower(*x);
484                x++;
485                if (n == 31) break;
486            }
487            hardware[n] = 0;
488        }
489    }
490
491    if (rev) {
492        x = strstr(rev, ": ");
493        if (x) {
494            revision = strtoul(x + 2, 0, 16);
495        }
496    }
497}
498
499static struct command *get_first_command(struct action *act)
500{
501    struct listnode *node;
502    node = list_head(&act->commands);
503    if (!node)
504        return NULL;
505
506    return node_to_item(node, struct command, clist);
507}
508
509static struct command *get_next_command(struct action *act, struct command *cmd)
510{
511    struct listnode *node;
512    node = cmd->clist.next;
513    if (!node)
514        return NULL;
515    if (node == &act->commands)
516        return NULL;
517
518    return node_to_item(node, struct command, clist);
519}
520
521static int is_last_command(struct action *act, struct command *cmd)
522{
523    return (list_tail(&act->commands) == &cmd->clist);
524}
525
526void execute_one_command(void)
527{
528    int ret;
529
530    if (!cur_action || !cur_command || is_last_command(cur_action, cur_command)) {
531        cur_action = action_remove_queue_head();
532        if (!cur_action)
533            return;
534        INFO("processing action %p (%s)\n", cur_action, cur_action->name);
535        cur_command = get_first_command(cur_action);
536    } else {
537        cur_command = get_next_command(cur_action, cur_command);
538    }
539
540    if (!cur_command)
541        return;
542
543    ret = cur_command->func(cur_command->nargs, cur_command->args);
544    INFO("command '%s' r=%d\n", cur_command->args[0], ret);
545}
546
547void open_devnull_stdio(void)
548{
549    int fd;
550    static const char *name = "/dev/__null__";
551    if (mknod(name, S_IFCHR | 0600, (1 << 8) | 3) == 0) {
552        fd = open(name, O_RDWR);
553        unlink(name);
554        if (fd >= 0) {
555            dup2(fd, 0);
556            dup2(fd, 1);
557            dup2(fd, 2);
558            if (fd > 2) {
559                close(fd);
560            }
561            return;
562        }
563    }
564
565    exit(1);
566}
567
568static int device_init_action(int nargs, char **args)
569{
570    INFO("device init\n");
571    device_init();
572    return 0;
573}
574
575static int property_init_action(int nargs, char **args)
576{
577    INFO("property init\n");
578    property_init();
579    return 0;
580}
581
582static int keychord_init_action(int nargs, char **args)
583{
584    keychord_init();
585    return 0;
586}
587
588static int console_init_action(int nargs, char **args)
589{
590    int fd;
591    char tmp[PROP_VALUE_MAX];
592
593    if (console[0]) {
594        snprintf(tmp, sizeof(tmp), "/dev/%s", console);
595        console_name = strdup(tmp);
596    }
597
598    fd = open(console_name, O_RDWR);
599    if (fd >= 0)
600        have_console = 1;
601    close(fd);
602
603    if( load_565rle_image(INIT_IMAGE_FILE) ) {
604        fd = open("/dev/tty0", O_WRONLY);
605        if (fd >= 0) {
606            const char *msg;
607                msg = "\n"
608            "\n"
609            "\n"
610            "\n"
611            "\n"
612            "\n"
613            "\n"  // console is 40 cols x 30 lines
614            "\n"
615            "\n"
616            "\n"
617            "\n"
618            "\n"
619            "\n"
620            "\n"
621            "             A N D R O I D ";
622            write(fd, msg, strlen(msg));
623            close(fd);
624        }
625    }
626    return 0;
627}
628
629static int set_init_properties_action(int nargs, char **args)
630{
631    char tmp[PROP_VALUE_MAX];
632
633    if (qemu[0])
634        import_kernel_cmdline(1);
635
636    if (!strcmp(bootmode,"factory"))
637        property_set("ro.factorytest", "1");
638    else if (!strcmp(bootmode,"factory2"))
639        property_set("ro.factorytest", "2");
640    else
641        property_set("ro.factorytest", "0");
642
643    property_set("ro.serialno", serialno[0] ? serialno : "");
644    property_set("ro.bootmode", bootmode[0] ? bootmode : "unknown");
645    property_set("ro.baseband", baseband[0] ? baseband : "unknown");
646    property_set("ro.carrier", carrier[0] ? carrier : "unknown");
647    property_set("ro.bootloader", bootloader[0] ? bootloader : "unknown");
648
649    property_set("ro.hardware", hardware);
650    snprintf(tmp, PROP_VALUE_MAX, "%d", revision);
651    property_set("ro.revision", tmp);
652    return 0;
653}
654
655static int property_service_init_action(int nargs, char **args)
656{
657    /* read any property files on system or data and
658     * fire up the property service.  This must happen
659     * after the ro.foo properties are set above so
660     * that /data/local.prop cannot interfere with them.
661     */
662    start_property_service();
663    return 0;
664}
665
666static int signal_init_action(int nargs, char **args)
667{
668    signal_init();
669    return 0;
670}
671
672static int check_startup_action(int nargs, char **args)
673{
674    /* make sure we actually have all the pieces we need */
675    if ((get_device_fd() < 0) ||
676        (get_property_set_fd() < 0) ||
677        (get_signal_fd() < 0)) {
678        ERROR("init startup failure\n");
679        exit(1);
680    }
681    return 0;
682}
683
684static int queue_property_triggers_action(int nargs, char **args)
685{
686    queue_all_property_triggers();
687    /* enable property triggers */
688    property_triggers_enabled = 1;
689    return 0;
690}
691
692#if BOOTCHART
693static int bootchart_init_action(int nargs, char **args)
694{
695    bootchart_count = bootchart_init();
696    if (bootchart_count < 0) {
697        ERROR("bootcharting init failure\n");
698    } else if (bootchart_count > 0) {
699        NOTICE("bootcharting started (period=%d ms)\n", bootchart_count*BOOTCHART_POLLING_MS);
700    } else {
701        NOTICE("bootcharting ignored\n");
702    }
703}
704#endif
705
706int main(int argc, char **argv)
707{
708    int fd_count = 0;
709    struct pollfd ufds[4];
710    char *tmpdev;
711    char* debuggable;
712    char tmp[32];
713    int device_fd_init = 0;
714    int property_set_fd_init = 0;
715    int signal_fd_init = 0;
716    int keychord_fd_init = 0;
717
718    /* clear the umask */
719    umask(0);
720
721        /* Get the basic filesystem setup we need put
722         * together in the initramdisk on / and then we'll
723         * let the rc file figure out the rest.
724         */
725    mkdir("/dev", 0755);
726    mkdir("/proc", 0755);
727    mkdir("/sys", 0755);
728
729    mount("tmpfs", "/dev", "tmpfs", 0, "mode=0755");
730    mkdir("/dev/pts", 0755);
731    mkdir("/dev/socket", 0755);
732    mount("devpts", "/dev/pts", "devpts", 0, NULL);
733    mount("proc", "/proc", "proc", 0, NULL);
734    mount("sysfs", "/sys", "sysfs", 0, NULL);
735
736        /* We must have some place other than / to create the
737         * device nodes for kmsg and null, otherwise we won't
738         * be able to remount / read-only later on.
739         * Now that tmpfs is mounted on /dev, we can actually
740         * talk to the outside world.
741         */
742    open_devnull_stdio();
743    log_init();
744
745    INFO("reading config file\n");
746    parse_config_file("/init.rc");
747
748    /* pull the kernel commandline and ramdisk properties file in */
749    qemu_init();
750    import_kernel_cmdline(0);
751
752    get_hardware_name();
753    snprintf(tmp, sizeof(tmp), "/init.%s.rc", hardware);
754    parse_config_file(tmp);
755
756    action_for_each_trigger("early-init", action_add_queue_tail);
757
758    queue_builtin_action(device_init_action, "device_init");
759    queue_builtin_action(property_init_action, "property_init");
760    queue_builtin_action(keychord_init_action, "keychord_init");
761    queue_builtin_action(console_init_action, "console_init");
762    queue_builtin_action(set_init_properties_action, "set_init_properties");
763
764        /* execute all the boot actions to get us started */
765    action_for_each_trigger("init", action_add_queue_tail);
766    action_for_each_trigger("early-fs", action_add_queue_tail);
767    action_for_each_trigger("fs", action_add_queue_tail);
768    action_for_each_trigger("post-fs", action_add_queue_tail);
769
770    queue_builtin_action(property_service_init_action, "property_service_init");
771    queue_builtin_action(signal_init_action, "signal_init");
772    queue_builtin_action(check_startup_action, "check_startup");
773
774    /* execute all the boot actions to get us started */
775    action_for_each_trigger("early-boot", action_add_queue_tail);
776    action_for_each_trigger("boot", action_add_queue_tail);
777
778        /* run all property triggers based on current state of the properties */
779    queue_builtin_action(queue_property_triggers_action, "queue_propety_triggers");
780
781
782#if BOOTCHART
783    queue_builtin_action(bootchart_init_action, "bootchart_init");
784#endif
785
786    for(;;) {
787        int nr, i, timeout = -1;
788
789        execute_one_command();
790        restart_processes();
791
792        if (!device_fd_init && get_device_fd() > 0) {
793            ufds[fd_count].fd = get_device_fd();
794            ufds[fd_count].events = POLLIN;
795            ufds[fd_count].revents = 0;
796            fd_count++;
797            device_fd_init = 1;
798        }
799        if (!property_set_fd_init && get_property_set_fd() > 0) {
800            ufds[fd_count].fd = get_property_set_fd();
801            ufds[fd_count].events = POLLIN;
802            ufds[fd_count].revents = 0;
803            fd_count++;
804            property_set_fd_init = 1;
805        }
806        if (!signal_fd_init && get_signal_fd() > 0) {
807            ufds[fd_count].fd = get_signal_fd();
808            ufds[fd_count].events = POLLIN;
809            ufds[fd_count].revents = 0;
810            fd_count++;
811            signal_fd_init = 1;
812        }
813        if (!keychord_fd_init && get_keychord_fd() > 0) {
814            ufds[fd_count].fd = get_keychord_fd();
815            ufds[fd_count].events = POLLIN;
816            ufds[fd_count].revents = 0;
817            fd_count++;
818            keychord_fd_init = 1;
819        }
820
821        if (process_needs_restart) {
822            timeout = (process_needs_restart - gettime()) * 1000;
823            if (timeout < 0)
824                timeout = 0;
825        }
826
827        if (!action_queue_empty() || cur_command)
828            timeout = 0;
829
830#if BOOTCHART
831        if (bootchart_count > 0) {
832            if (timeout < 0 || timeout > BOOTCHART_POLLING_MS)
833                timeout = BOOTCHART_POLLING_MS;
834            if (bootchart_step() < 0 || --bootchart_count == 0) {
835                bootchart_finish();
836                bootchart_count = 0;
837            }
838        }
839#endif
840
841        nr = poll(ufds, fd_count, timeout);
842        if (nr <= 0)
843            continue;
844
845        for (i = 0; i < fd_count; i++) {
846            if (ufds[i].revents == POLLIN) {
847                if (ufds[i].fd == get_device_fd())
848                    handle_device_fd();
849                else if (ufds[i].fd == get_property_set_fd())
850                    handle_property_set_fd();
851                else if (ufds[i].fd == get_keychord_fd())
852                    handle_keychord();
853                else if (ufds[i].fd == get_signal_fd())
854                    handle_signal();
855            }
856        }
857    }
858
859    return 0;
860}
861