init.c revision ed8a7d84428ec945c48b6b53dc5a3a18fabaf683 
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 "list.h"
44#include "log.h"
45#include "property_service.h"
46#include "bootchart.h"
47#include "signal_handler.h"
48#include "keychords.h"
49#include "parser.h"
50#include "util.h"
51
52static int property_triggers_enabled = 0;
53
54#if BOOTCHART
55static int   bootchart_count;
56#endif
57
58static char console[32];
59static char serialno[32];
60static char bootmode[32];
61static char baseband[32];
62static char carrier[32];
63static char bootloader[32];
64static char hardware[32];
65static unsigned revision = 0;
66static char qemu[32];
67
68static struct action *cur_action = NULL;
69static struct command *cur_command = NULL;
70static struct listnode *command_queue = NULL;
71
72void notify_service_state(const char *name, const char *state)
73{
74    char pname[PROP_NAME_MAX];
75    int len = strlen(name);
76    if ((len + 10) > PROP_NAME_MAX)
77        return;
78    snprintf(pname, sizeof(pname), "init.svc.%s", name);
79    property_set(pname, state);
80}
81
82static int have_console;
83static char *console_name = "/dev/console";
84static time_t process_needs_restart;
85
86static const char *ENV[32];
87
88/* add_environment - add "key=value" to the current environment */
89int add_environment(const char *key, const char *val)
90{
91    int n;
92
93    for (n = 0; n < 31; n++) {
94        if (!ENV[n]) {
95            size_t len = strlen(key) + strlen(val) + 2;
96            char *entry = malloc(len);
97            snprintf(entry, len, "%s=%s", key, val);
98            ENV[n] = entry;
99            return 0;
100        }
101    }
102
103    return 1;
104}
105
106static void zap_stdio(void)
107{
108    int fd;
109    fd = open("/dev/null", O_RDWR);
110    dup2(fd, 0);
111    dup2(fd, 1);
112    dup2(fd, 2);
113    close(fd);
114}
115
116static void open_console()
117{
118    int fd;
119    if ((fd = open(console_name, O_RDWR)) < 0) {
120        fd = open("/dev/null", O_RDWR);
121    }
122    dup2(fd, 0);
123    dup2(fd, 1);
124    dup2(fd, 2);
125    close(fd);
126}
127
128static void publish_socket(const char *name, int fd)
129{
130    char key[64] = ANDROID_SOCKET_ENV_PREFIX;
131    char val[64];
132
133    strlcpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1,
134            name,
135            sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX));
136    snprintf(val, sizeof(val), "%d", fd);
137    add_environment(key, val);
138
139    /* make sure we don't close-on-exec */
140    fcntl(fd, F_SETFD, 0);
141}
142
143void service_start(struct service *svc, const char *dynamic_args)
144{
145    struct stat s;
146    pid_t pid;
147    int needs_console;
148    int n;
149
150        /* starting a service removes it from the disabled
151         * state and immediately takes it out of the restarting
152         * state if it was in there
153         */
154    svc->flags &= (~(SVC_DISABLED|SVC_RESTARTING));
155    svc->time_started = 0;
156
157        /* running processes require no additional work -- if
158         * they're in the process of exiting, we've ensured
159         * that they will immediately restart on exit, unless
160         * they are ONESHOT
161         */
162    if (svc->flags & SVC_RUNNING) {
163        return;
164    }
165
166    needs_console = (svc->flags & SVC_CONSOLE) ? 1 : 0;
167    if (needs_console && (!have_console)) {
168        ERROR("service '%s' requires console\n", svc->name);
169        svc->flags |= SVC_DISABLED;
170        return;
171    }
172
173    if (stat(svc->args[0], &s) != 0) {
174        ERROR("cannot find '%s', disabling '%s'\n", svc->args[0], svc->name);
175        svc->flags |= SVC_DISABLED;
176        return;
177    }
178
179    if ((!(svc->flags & SVC_ONESHOT)) && dynamic_args) {
180        ERROR("service '%s' must be one-shot to use dynamic args, disabling\n",
181               svc->args[0]);
182        svc->flags |= SVC_DISABLED;
183        return;
184    }
185
186    NOTICE("starting '%s'\n", svc->name);
187
188    pid = fork();
189
190    if (pid == 0) {
191        struct socketinfo *si;
192        struct svcenvinfo *ei;
193        char tmp[32];
194        int fd, sz;
195
196        get_property_workspace(&fd, &sz);
197        sprintf(tmp, "%d,%d", dup(fd), sz);
198        add_environment("ANDROID_PROPERTY_WORKSPACE", tmp);
199
200        for (ei = svc->envvars; ei; ei = ei->next)
201            add_environment(ei->name, ei->value);
202
203        for (si = svc->sockets; si; si = si->next) {
204            int s = create_socket(si->name,
205                                  !strcmp(si->type, "dgram") ?
206                                  SOCK_DGRAM : SOCK_STREAM,
207                                  si->perm, si->uid, si->gid);
208            if (s >= 0) {
209                publish_socket(si->name, s);
210            }
211        }
212
213        if (svc->ioprio_class != IoSchedClass_NONE) {
214            if (android_set_ioprio(getpid(), svc->ioprio_class, svc->ioprio_pri)) {
215                ERROR("Failed to set pid %d ioprio = %d,%d: %s\n",
216                      getpid(), svc->ioprio_class, svc->ioprio_pri, strerror(errno));
217            }
218        }
219
220        if (needs_console) {
221            setsid();
222            open_console();
223        } else {
224            zap_stdio();
225        }
226
227#if 0
228        for (n = 0; svc->args[n]; n++) {
229            INFO("args[%d] = '%s'\n", n, svc->args[n]);
230        }
231        for (n = 0; ENV[n]; n++) {
232            INFO("env[%d] = '%s'\n", n, ENV[n]);
233        }
234#endif
235
236        setpgid(0, getpid());
237
238    /* as requested, set our gid, supplemental gids, and uid */
239        if (svc->gid) {
240            setgid(svc->gid);
241        }
242        if (svc->nr_supp_gids) {
243            setgroups(svc->nr_supp_gids, svc->supp_gids);
244        }
245        if (svc->uid) {
246            setuid(svc->uid);
247        }
248
249        if (!dynamic_args) {
250            if (execve(svc->args[0], (char**) svc->args, (char**) ENV) < 0) {
251                ERROR("cannot execve('%s'): %s\n", svc->args[0], strerror(errno));
252            }
253        } else {
254            char *arg_ptrs[SVC_MAXARGS+1];
255            int arg_idx = svc->nargs;
256            char *tmp = strdup(dynamic_args);
257            char *next = tmp;
258            char *bword;
259
260            /* Copy the static arguments */
261            memcpy(arg_ptrs, svc->args, (svc->nargs * sizeof(char *)));
262
263            while((bword = strsep(&next, " "))) {
264                arg_ptrs[arg_idx++] = bword;
265                if (arg_idx == SVC_MAXARGS)
266                    break;
267            }
268            arg_ptrs[arg_idx] = '\0';
269            execve(svc->args[0], (char**) arg_ptrs, (char**) ENV);
270        }
271        _exit(127);
272    }
273
274    if (pid < 0) {
275        ERROR("failed to start '%s'\n", svc->name);
276        svc->pid = 0;
277        return;
278    }
279
280    svc->time_started = gettime();
281    svc->pid = pid;
282    svc->flags |= SVC_RUNNING;
283
284    notify_service_state(svc->name, "running");
285}
286
287void service_stop(struct service *svc)
288{
289        /* we are no longer running, nor should we
290         * attempt to restart
291         */
292    svc->flags &= (~(SVC_RUNNING|SVC_RESTARTING));
293
294        /* if the service has not yet started, prevent
295         * it from auto-starting with its class
296         */
297    svc->flags |= SVC_DISABLED;
298
299    if (svc->pid) {
300        NOTICE("service '%s' is being killed\n", svc->name);
301        kill(-svc->pid, SIGTERM);
302        notify_service_state(svc->name, "stopping");
303    } else {
304        notify_service_state(svc->name, "stopped");
305    }
306}
307
308void property_changed(const char *name, const char *value)
309{
310    if (property_triggers_enabled)
311        queue_property_triggers(name, value);
312}
313
314static void restart_service_if_needed(struct service *svc)
315{
316    time_t next_start_time = svc->time_started + 5;
317
318    if (next_start_time <= gettime()) {
319        svc->flags &= (~SVC_RESTARTING);
320        service_start(svc, NULL);
321        return;
322    }
323
324    if ((next_start_time < process_needs_restart) ||
325        (process_needs_restart == 0)) {
326        process_needs_restart = next_start_time;
327    }
328}
329
330static void restart_processes()
331{
332    process_needs_restart = 0;
333    service_for_each_flags(SVC_RESTARTING,
334                           restart_service_if_needed);
335}
336
337static void msg_start(const char *name)
338{
339    struct service *svc;
340    char *tmp = NULL;
341    char *args = NULL;
342
343    if (!strchr(name, ':'))
344        svc = service_find_by_name(name);
345    else {
346        tmp = strdup(name);
347        args = strchr(tmp, ':');
348        *args = '\0';
349        args++;
350
351        svc = service_find_by_name(tmp);
352    }
353
354    if (svc) {
355        service_start(svc, args);
356    } else {
357        ERROR("no such service '%s'\n", name);
358    }
359    if (tmp)
360        free(tmp);
361}
362
363static void msg_stop(const char *name)
364{
365    struct service *svc = service_find_by_name(name);
366
367    if (svc) {
368        service_stop(svc);
369    } else {
370        ERROR("no such service '%s'\n", name);
371    }
372}
373
374void handle_control_message(const char *msg, const char *arg)
375{
376    if (!strcmp(msg,"start")) {
377        msg_start(arg);
378    } else if (!strcmp(msg,"stop")) {
379        msg_stop(arg);
380    } else {
381        ERROR("unknown control msg '%s'\n", msg);
382    }
383}
384
385static void import_kernel_nv(char *name, int in_qemu)
386{
387    char *value = strchr(name, '=');
388
389    if (value == 0) return;
390    *value++ = 0;
391    if (*name == 0) return;
392
393    if (!in_qemu)
394    {
395        /* on a real device, white-list the kernel options */
396        if (!strcmp(name,"qemu")) {
397            strlcpy(qemu, value, sizeof(qemu));
398        } else if (!strcmp(name,"androidboot.console")) {
399            strlcpy(console, value, sizeof(console));
400        } else if (!strcmp(name,"androidboot.mode")) {
401            strlcpy(bootmode, value, sizeof(bootmode));
402        } else if (!strcmp(name,"androidboot.serialno")) {
403            strlcpy(serialno, value, sizeof(serialno));
404        } else if (!strcmp(name,"androidboot.baseband")) {
405            strlcpy(baseband, value, sizeof(baseband));
406        } else if (!strcmp(name,"androidboot.carrier")) {
407            strlcpy(carrier, value, sizeof(carrier));
408        } else if (!strcmp(name,"androidboot.bootloader")) {
409            strlcpy(bootloader, value, sizeof(bootloader));
410        } else if (!strcmp(name,"androidboot.hardware")) {
411            strlcpy(hardware, value, sizeof(hardware));
412        } else {
413            qemu_cmdline(name, value);
414        }
415    } else {
416        /* in the emulator, export any kernel option with the
417         * ro.kernel. prefix */
418        char  buff[32];
419        int   len = snprintf( buff, sizeof(buff), "ro.kernel.%s", name );
420        if (len < (int)sizeof(buff)) {
421            property_set( buff, value );
422        }
423    }
424}
425
426static void import_kernel_cmdline(int in_qemu)
427{
428    char cmdline[1024];
429    char *ptr;
430    int fd;
431
432    fd = open("/proc/cmdline", O_RDONLY);
433    if (fd >= 0) {
434        int n = read(fd, cmdline, 1023);
435        if (n < 0) n = 0;
436
437        /* get rid of trailing newline, it happens */
438        if (n > 0 && cmdline[n-1] == '\n') n--;
439
440        cmdline[n] = 0;
441        close(fd);
442    } else {
443        cmdline[0] = 0;
444    }
445
446    ptr = cmdline;
447    while (ptr && *ptr) {
448        char *x = strchr(ptr, ' ');
449        if (x != 0) *x++ = 0;
450        import_kernel_nv(ptr, in_qemu);
451        ptr = x;
452    }
453
454        /* don't expose the raw commandline to nonpriv processes */
455    chmod("/proc/cmdline", 0440);
456}
457
458static void get_hardware_name(void)
459{
460    char data[1024];
461    int fd, n;
462    char *x, *hw, *rev;
463
464    /* Hardware string was provided on kernel command line */
465    if (hardware[0])
466        return;
467
468    fd = open("/proc/cpuinfo", O_RDONLY);
469    if (fd < 0) return;
470
471    n = read(fd, data, 1023);
472    close(fd);
473    if (n < 0) return;
474
475    data[n] = 0;
476    hw = strstr(data, "\nHardware");
477    rev = strstr(data, "\nRevision");
478
479    if (hw) {
480        x = strstr(hw, ": ");
481        if (x) {
482            x += 2;
483            n = 0;
484            while (*x && !isspace(*x)) {
485                hardware[n++] = tolower(*x);
486                x++;
487                if (n == 31) break;
488            }
489            hardware[n] = 0;
490        }
491    }
492
493    if (rev) {
494        x = strstr(rev, ": ");
495        if (x) {
496            revision = strtoul(x + 2, 0, 16);
497        }
498    }
499}
500
501static struct command *get_first_command(struct action *act)
502{
503    struct listnode *node;
504    node = list_head(&act->commands);
505    if (!node)
506        return NULL;
507
508    return node_to_item(node, struct command, clist);
509}
510
511static struct command *get_next_command(struct action *act, struct command *cmd)
512{
513    struct listnode *node;
514    node = cmd->clist.next;
515    if (!node)
516        return NULL;
517    if (node == &act->commands)
518        return NULL;
519
520    return node_to_item(node, struct command, clist);
521}
522
523static int is_last_command(struct action *act, struct command *cmd)
524{
525    return (list_tail(&act->commands) == &cmd->clist);
526}
527
528void execute_one_command(void)
529{
530    int ret;
531
532    if (!cur_action || !cur_command || is_last_command(cur_action, cur_command)) {
533        cur_action = action_remove_queue_head();
534        if (!cur_action)
535            return;
536        INFO("processing action %p (%s)\n", cur_action, cur_action->name);
537        cur_command = get_first_command(cur_action);
538    } else {
539        cur_command = get_next_command(cur_action, cur_command);
540    }
541
542    if (!cur_command)
543        return;
544
545    ret = cur_command->func(cur_command->nargs, cur_command->args);
546    INFO("command '%s' r=%d\n", cur_command->args[0], ret);
547}
548
549void open_devnull_stdio(void)
550{
551    int fd;
552    static const char *name = "/dev/__null__";
553    if (mknod(name, S_IFCHR | 0600, (1 << 8) | 3) == 0) {
554        fd = open(name, O_RDWR);
555        unlink(name);
556        if (fd >= 0) {
557            dup2(fd, 0);
558            dup2(fd, 1);
559            dup2(fd, 2);
560            if (fd > 2) {
561                close(fd);
562            }
563            return;
564        }
565    }
566
567    exit(1);
568}
569
570static int device_init_action(int nargs, char **args)
571{
572    INFO("device init\n");
573    device_init();
574    return 0;
575}
576
577static int property_init_action(int nargs, char **args)
578{
579    INFO("property init\n");
580    property_init();
581    return 0;
582}
583
584static int keychord_init_action(int nargs, char **args)
585{
586    keychord_init();
587    return 0;
588}
589
590static int console_init_action(int nargs, char **args)
591{
592    int fd;
593    char tmp[PROP_VALUE_MAX];
594
595    if (console[0]) {
596        snprintf(tmp, sizeof(tmp), "/dev/%s", console);
597        console_name = strdup(tmp);
598    }
599
600    fd = open(console_name, O_RDWR);
601    if (fd >= 0)
602        have_console = 1;
603    close(fd);
604
605    if( load_565rle_image(INIT_IMAGE_FILE) ) {
606        fd = open("/dev/tty0", O_WRONLY);
607        if (fd >= 0) {
608            const char *msg;
609                msg = "\n"
610            "\n"
611            "\n"
612            "\n"
613            "\n"
614            "\n"
615            "\n"  // console is 40 cols x 30 lines
616            "\n"
617            "\n"
618            "\n"
619            "\n"
620            "\n"
621            "\n"
622            "\n"
623            "             A N D R O I D ";
624            write(fd, msg, strlen(msg));
625            close(fd);
626        }
627    }
628    return 0;
629}
630
631static int set_init_properties_action(int nargs, char **args)
632{
633    char tmp[PROP_VALUE_MAX];
634
635    if (qemu[0])
636        import_kernel_cmdline(1);
637
638    if (!strcmp(bootmode,"factory"))
639        property_set("ro.factorytest", "1");
640    else if (!strcmp(bootmode,"factory2"))
641        property_set("ro.factorytest", "2");
642    else
643        property_set("ro.factorytest", "0");
644
645    property_set("ro.serialno", serialno[0] ? serialno : "");
646    property_set("ro.bootmode", bootmode[0] ? bootmode : "unknown");
647    property_set("ro.baseband", baseband[0] ? baseband : "unknown");
648    property_set("ro.carrier", carrier[0] ? carrier : "unknown");
649    property_set("ro.bootloader", bootloader[0] ? bootloader : "unknown");
650
651    property_set("ro.hardware", hardware);
652    snprintf(tmp, PROP_VALUE_MAX, "%d", revision);
653    property_set("ro.revision", tmp);
654    return 0;
655}
656
657static int property_service_init_action(int nargs, char **args)
658{
659    /* read any property files on system or data and
660     * fire up the property service.  This must happen
661     * after the ro.foo properties are set above so
662     * that /data/local.prop cannot interfere with them.
663     */
664    start_property_service();
665    return 0;
666}
667
668static int signal_init_action(int nargs, char **args)
669{
670    signal_init();
671    return 0;
672}
673
674static int check_startup_action(int nargs, char **args)
675{
676    /* make sure we actually have all the pieces we need */
677    if ((get_device_fd() < 0) ||
678        (get_property_set_fd() < 0) ||
679        (get_signal_fd() < 0)) {
680        ERROR("init startup failure\n");
681        exit(1);
682    }
683    return 0;
684}
685
686static int queue_property_triggers_action(int nargs, char **args)
687{
688    queue_all_property_triggers();
689    /* enable property triggers */
690    property_triggers_enabled = 1;
691    return 0;
692}
693
694#if BOOTCHART
695static int bootchart_init_action(int nargs, char **args)
696{
697    bootchart_count = bootchart_init();
698    if (bootchart_count < 0) {
699        ERROR("bootcharting init failure\n");
700    } else if (bootchart_count > 0) {
701        NOTICE("bootcharting started (period=%d ms)\n", bootchart_count*BOOTCHART_POLLING_MS);
702    } else {
703        NOTICE("bootcharting ignored\n");
704    }
705}
706#endif
707
708int main(int argc, char **argv)
709{
710    int fd_count = 0;
711    struct pollfd ufds[4];
712    char *tmpdev;
713    char* debuggable;
714    char tmp[32];
715    int device_fd_init = 0;
716    int property_set_fd_init = 0;
717    int signal_fd_init = 0;
718    int keychord_fd_init = 0;
719
720    /* clear the umask */
721    umask(0);
722
723        /* Get the basic filesystem setup we need put
724         * together in the initramdisk on / and then we'll
725         * let the rc file figure out the rest.
726         */
727    mkdir("/dev", 0755);
728    mkdir("/proc", 0755);
729    mkdir("/sys", 0755);
730
731    mount("tmpfs", "/dev", "tmpfs", 0, "mode=0755");
732    mkdir("/dev/pts", 0755);
733    mkdir("/dev/socket", 0755);
734    mount("devpts", "/dev/pts", "devpts", 0, NULL);
735    mount("proc", "/proc", "proc", 0, NULL);
736    mount("sysfs", "/sys", "sysfs", 0, NULL);
737
738        /* We must have some place other than / to create the
739         * device nodes for kmsg and null, otherwise we won't
740         * be able to remount / read-only later on.
741         * Now that tmpfs is mounted on /dev, we can actually
742         * talk to the outside world.
743         */
744    open_devnull_stdio();
745    log_init();
746
747    INFO("reading config file\n");
748    parse_config_file("/init.rc");
749
750    /* pull the kernel commandline and ramdisk properties file in */
751    qemu_init();
752    import_kernel_cmdline(0);
753
754    get_hardware_name();
755    snprintf(tmp, sizeof(tmp), "/init.%s.rc", hardware);
756    parse_config_file(tmp);
757
758    action_for_each_trigger("early-init", action_add_queue_tail);
759
760    queue_builtin_action(device_init_action, "device_init");
761    queue_builtin_action(property_init_action, "property_init");
762    queue_builtin_action(keychord_init_action, "keychord_init");
763    queue_builtin_action(console_init_action, "console_init");
764    queue_builtin_action(set_init_properties_action, "set_init_properties");
765
766        /* execute all the boot actions to get us started */
767    action_for_each_trigger("init", action_add_queue_tail);
768    action_for_each_trigger("early-fs", action_add_queue_tail);
769    action_for_each_trigger("fs", action_add_queue_tail);
770    action_for_each_trigger("post-fs", action_add_queue_tail);
771
772    queue_builtin_action(property_service_init_action, "property_service_init");
773    queue_builtin_action(signal_init_action, "signal_init");
774    queue_builtin_action(check_startup_action, "check_startup");
775
776    /* execute all the boot actions to get us started */
777    action_for_each_trigger("early-boot", action_add_queue_tail);
778    action_for_each_trigger("boot", action_add_queue_tail);
779
780        /* run all property triggers based on current state of the properties */
781    queue_builtin_action(queue_property_triggers_action, "queue_propety_triggers");
782
783
784#if BOOTCHART
785    queue_builtin_action(bootchart_init_action, "bootchart_init");
786#endif
787
788    for(;;) {
789        int nr, i, timeout = -1;
790
791        execute_one_command();
792        restart_processes();
793
794        if (!device_fd_init && get_device_fd() > 0) {
795            ufds[fd_count].fd = get_device_fd();
796            ufds[fd_count].events = POLLIN;
797            ufds[fd_count].revents = 0;
798            fd_count++;
799            device_fd_init = 1;
800        }
801        if (!property_set_fd_init && get_property_set_fd() > 0) {
802            ufds[fd_count].fd = get_property_set_fd();
803            ufds[fd_count].events = POLLIN;
804            ufds[fd_count].revents = 0;
805            fd_count++;
806            property_set_fd_init = 1;
807        }
808        if (!signal_fd_init && get_signal_fd() > 0) {
809            ufds[fd_count].fd = get_signal_fd();
810            ufds[fd_count].events = POLLIN;
811            ufds[fd_count].revents = 0;
812            fd_count++;
813            signal_fd_init = 1;
814        }
815        if (!keychord_fd_init && get_keychord_fd() > 0) {
816            ufds[fd_count].fd = get_keychord_fd();
817            ufds[fd_count].events = POLLIN;
818            ufds[fd_count].revents = 0;
819            fd_count++;
820            keychord_fd_init = 1;
821        }
822
823        if (process_needs_restart) {
824            timeout = (process_needs_restart - gettime()) * 1000;
825            if (timeout < 0)
826                timeout = 0;
827        }
828
829        if (!action_queue_empty() || cur_command)
830            timeout = 0;
831
832#if BOOTCHART
833        if (bootchart_count > 0) {
834            if (timeout < 0 || timeout > BOOTCHART_POLLING_MS)
835                timeout = BOOTCHART_POLLING_MS;
836            if (bootchart_step() < 0 || --bootchart_count == 0) {
837                bootchart_finish();
838                bootchart_count = 0;
839            }
840        }
841#endif
842
843        nr = poll(ufds, fd_count, timeout);
844        if (nr <= 0)
845            continue;
846
847        for (i = 0; i < fd_count; i++) {
848            if (ufds[i].revents == POLLIN) {
849                if (ufds[i].fd == get_device_fd())
850                    handle_device_fd();
851                else if (ufds[i].fd == get_property_set_fd())
852                    handle_property_set_fd();
853                else if (ufds[i].fd == get_keychord_fd())
854                    handle_keychord();
855                else if (ufds[i].fd == get_signal_fd())
856                    handle_signal();
857            }
858        }
859    }
860
861    return 0;
862}
863