init.c revision 4f6e8d7a00cbeda1e70cc15be9c4af1018bdad53 
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 <time.h>
29#include <errno.h>
30#include <stdarg.h>
31#include <mtd/mtd-user.h>
32#include <sys/types.h>
33#include <sys/socket.h>
34#include <sys/un.h>
35#include <sys/reboot.h>
36
37#include <cutils/sockets.h>
38#include <termios.h>
39#include <linux/kd.h>
40
41#include <sys/system_properties.h>
42
43#include "devices.h"
44#include "init.h"
45#include "property_service.h"
46
47#ifndef BOOTCHART
48# define  BOOTCHART  0
49#endif
50
51static int property_triggers_enabled = 0;
52
53#if BOOTCHART
54static int   bootchart_count;
55extern int   bootchart_init(void);
56extern int   bootchart_step(void);
57extern void  bootchart_finish(void);
58# define BOOTCHART_POLLING_MS   200 /* polling period in ms */
59# define BOOTCHART_MAX_TIME_MS  (2*60*1000) /* max polling time from boot */
60# define BOOTCHART_MAX_COUNT    (BOOTCHART_MAX_TIME_MS/BOOTCHART_POLLING_MS)
61#endif
62
63static char console[32];
64static char serialno[32];
65static char bootmode[32];
66static char baseband[32];
67static char carrier[32];
68static char bootloader[32];
69static char hardware[32];
70static unsigned revision = 0;
71static char qemu[32];
72
73static void drain_action_queue(void);
74
75static void 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
131/*
132 * gettime() - returns the time in seconds of the system's monotonic clock or
133 * zero on error.
134 */
135static time_t gettime(void)
136{
137    struct timespec ts;
138    int ret;
139
140    ret = clock_gettime(CLOCK_MONOTONIC, &ts);
141    if (ret < 0) {
142        ERROR("clock_gettime(CLOCK_MONOTONIC) failed: %s\n", strerror(errno));
143        return 0;
144    }
145
146    return ts.tv_sec;
147}
148
149static void publish_socket(const char *name, int fd)
150{
151    char key[64] = ANDROID_SOCKET_ENV_PREFIX;
152    char val[64];
153
154    strlcpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1,
155            name,
156            sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX));
157    snprintf(val, sizeof(val), "%d", fd);
158    add_environment(key, val);
159
160    /* make sure we don't close-on-exec */
161    fcntl(fd, F_SETFD, 0);
162}
163
164void service_start(struct service *svc)
165{
166    struct stat s;
167    pid_t pid;
168    int needs_console;
169    int n;
170
171        /* starting a service removes it from the disabled
172         * state and immediately takes it out of the restarting
173         * state if it was in there
174         */
175    svc->flags &= (~(SVC_DISABLED|SVC_RESTARTING));
176    svc->time_started = 0;
177
178        /* running processes require no additional work -- if
179         * they're in the process of exiting, we've ensured
180         * that they will immediately restart on exit, unless
181         * they are ONESHOT
182         */
183    if (svc->flags & SVC_RUNNING) {
184        return;
185    }
186
187    needs_console = (svc->flags & SVC_CONSOLE) ? 1 : 0;
188    if (needs_console && (!have_console)) {
189        ERROR("service '%s' requires console\n", svc->name);
190        svc->flags |= SVC_DISABLED;
191        return;
192    }
193
194    if (stat(svc->args[0], &s) != 0) {
195        ERROR("cannot find '%s', disabling '%s'\n", svc->args[0], svc->name);
196        svc->flags |= SVC_DISABLED;
197        return;
198    }
199
200    NOTICE("starting '%s'\n", svc->name);
201
202    pid = fork();
203
204    if (pid == 0) {
205        struct socketinfo *si;
206        struct svcenvinfo *ei;
207        char tmp[32];
208        int fd, sz;
209
210        get_property_workspace(&fd, &sz);
211        sprintf(tmp, "%d,%d", dup(fd), sz);
212        add_environment("ANDROID_PROPERTY_WORKSPACE", tmp);
213
214        for (ei = svc->envvars; ei; ei = ei->next)
215            add_environment(ei->name, ei->value);
216
217        for (si = svc->sockets; si; si = si->next) {
218            int s = create_socket(si->name,
219                                  !strcmp(si->type, "dgram") ?
220                                  SOCK_DGRAM : SOCK_STREAM,
221                                  si->perm, si->uid, si->gid);
222            if (s >= 0) {
223                publish_socket(si->name, s);
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            setgid(svc->gid);
248        }
249        if (svc->nr_supp_gids) {
250            setgroups(svc->nr_supp_gids, svc->supp_gids);
251        }
252        if (svc->uid) {
253            setuid(svc->uid);
254        }
255
256        execve(svc->args[0], (char**) svc->args, (char**) ENV);
257        _exit(127);
258    }
259
260    if (pid < 0) {
261        ERROR("failed to start '%s'\n", svc->name);
262        svc->pid = 0;
263        return;
264    }
265
266    svc->time_started = gettime();
267    svc->pid = pid;
268    svc->flags |= SVC_RUNNING;
269
270    notify_service_state(svc->name, "running");
271}
272
273void service_stop(struct service *svc)
274{
275        /* we are no longer running, nor should we
276         * attempt to restart
277         */
278    svc->flags &= (~(SVC_RUNNING|SVC_RESTARTING));
279
280        /* if the service has not yet started, prevent
281         * it from auto-starting with its class
282         */
283    svc->flags |= SVC_DISABLED;
284
285    if (svc->pid) {
286        NOTICE("service '%s' is being killed\n", svc->name);
287        kill(-svc->pid, SIGTERM);
288        notify_service_state(svc->name, "stopping");
289    } else {
290        notify_service_state(svc->name, "stopped");
291    }
292}
293
294void property_changed(const char *name, const char *value)
295{
296    if (property_triggers_enabled) {
297        queue_property_triggers(name, value);
298        drain_action_queue();
299    }
300}
301
302#define CRITICAL_CRASH_THRESHOLD    4       /* if we crash >4 times ... */
303#define CRITICAL_CRASH_WINDOW       (4*60)  /* ... in 4 minutes, goto recovery*/
304
305static int wait_for_one_process(int block)
306{
307    pid_t pid;
308    int status;
309    struct service *svc;
310    struct socketinfo *si;
311    time_t now;
312    struct listnode *node;
313    struct command *cmd;
314
315    while ( (pid = waitpid(-1, &status, block ? 0 : WNOHANG)) == -1 && errno == EINTR );
316    if (pid <= 0) return -1;
317    INFO("waitpid returned pid %d, status = %08x\n", pid, status);
318
319    svc = service_find_by_pid(pid);
320    if (!svc) {
321        ERROR("untracked pid %d exited\n", pid);
322        return 0;
323    }
324
325    NOTICE("process '%s', pid %d exited\n", svc->name, pid);
326
327    if (!(svc->flags & SVC_ONESHOT)) {
328        kill(-pid, SIGKILL);
329        NOTICE("process '%s' killing any children in process group\n", svc->name);
330    }
331
332    /* remove any sockets we may have created */
333    for (si = svc->sockets; si; si = si->next) {
334        char tmp[128];
335        snprintf(tmp, sizeof(tmp), ANDROID_SOCKET_DIR"/%s", si->name);
336        unlink(tmp);
337    }
338
339    svc->pid = 0;
340    svc->flags &= (~SVC_RUNNING);
341
342        /* oneshot processes go into the disabled state on exit */
343    if (svc->flags & SVC_ONESHOT) {
344        svc->flags |= SVC_DISABLED;
345    }
346
347        /* disabled processes do not get restarted automatically */
348    if (svc->flags & SVC_DISABLED) {
349        notify_service_state(svc->name, "stopped");
350        return 0;
351    }
352
353    now = gettime();
354    if (svc->flags & SVC_CRITICAL) {
355        if (svc->time_crashed + CRITICAL_CRASH_WINDOW >= now) {
356            if (++svc->nr_crashed > CRITICAL_CRASH_THRESHOLD) {
357                ERROR("critical process '%s' exited %d times in %d minutes; "
358                      "rebooting into recovery mode\n", svc->name,
359                      CRITICAL_CRASH_THRESHOLD, CRITICAL_CRASH_WINDOW / 60);
360                sync();
361                __reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2,
362                         LINUX_REBOOT_CMD_RESTART2, "recovery");
363                return 0;
364            }
365        } else {
366            svc->time_crashed = now;
367            svc->nr_crashed = 1;
368        }
369    }
370
371    /* Execute all onrestart commands for this service. */
372    list_for_each(node, &svc->onrestart.commands) {
373        cmd = node_to_item(node, struct command, clist);
374        cmd->func(cmd->nargs, cmd->args);
375    }
376    svc->flags |= SVC_RESTARTING;
377    notify_service_state(svc->name, "restarting");
378    return 0;
379}
380
381static void restart_service_if_needed(struct service *svc)
382{
383    time_t next_start_time = svc->time_started + 5;
384
385    if (next_start_time <= gettime()) {
386        svc->flags &= (~SVC_RESTARTING);
387        service_start(svc);
388        return;
389    }
390
391    if ((next_start_time < process_needs_restart) ||
392        (process_needs_restart == 0)) {
393        process_needs_restart = next_start_time;
394    }
395}
396
397static void restart_processes()
398{
399    process_needs_restart = 0;
400    service_for_each_flags(SVC_RESTARTING,
401                           restart_service_if_needed);
402}
403
404static int signal_fd = -1;
405
406static void sigchld_handler(int s)
407{
408    write(signal_fd, &s, 1);
409}
410
411static void msg_start(const char *name)
412{
413    struct service *svc = service_find_by_name(name);
414
415    if (svc) {
416        service_start(svc);
417    } else {
418        ERROR("no such service '%s'\n", name);
419    }
420}
421
422static void msg_stop(const char *name)
423{
424    struct service *svc = service_find_by_name(name);
425
426    if (svc) {
427        service_stop(svc);
428    } else {
429        ERROR("no such service '%s'\n");
430    }
431}
432
433void handle_control_message(const char *msg, const char *arg)
434{
435    if (!strcmp(msg,"start")) {
436        msg_start(arg);
437    } else if (!strcmp(msg,"stop")) {
438        msg_stop(arg);
439    } else {
440        ERROR("unknown control msg '%s'\n", msg);
441    }
442}
443
444#define MAX_MTD_PARTITIONS 16
445
446static struct {
447    char name[16];
448    int number;
449} mtd_part_map[MAX_MTD_PARTITIONS];
450
451static int mtd_part_count = -1;
452
453static void find_mtd_partitions(void)
454{
455    int fd;
456    char buf[1024];
457    char *pmtdbufp;
458    ssize_t pmtdsize;
459    int r;
460
461    fd = open("/proc/mtd", O_RDONLY);
462    if (fd < 0)
463        return;
464
465    buf[sizeof(buf) - 1] = '\0';
466    pmtdsize = read(fd, buf, sizeof(buf) - 1);
467    pmtdbufp = buf;
468    while (pmtdsize > 0) {
469        int mtdnum, mtdsize, mtderasesize;
470        char mtdname[16];
471        mtdname[0] = '\0';
472        mtdnum = -1;
473        r = sscanf(pmtdbufp, "mtd%d: %x %x %15s",
474                   &mtdnum, &mtdsize, &mtderasesize, mtdname);
475        if ((r == 4) && (mtdname[0] == '"')) {
476            char *x = strchr(mtdname + 1, '"');
477            if (x) {
478                *x = 0;
479            }
480            INFO("mtd partition %d, %s\n", mtdnum, mtdname + 1);
481            if (mtd_part_count < MAX_MTD_PARTITIONS) {
482                strcpy(mtd_part_map[mtd_part_count].name, mtdname + 1);
483                mtd_part_map[mtd_part_count].number = mtdnum;
484                mtd_part_count++;
485            } else {
486                ERROR("too many mtd partitions\n");
487            }
488        }
489        while (pmtdsize > 0 && *pmtdbufp != '\n') {
490            pmtdbufp++;
491            pmtdsize--;
492        }
493        if (pmtdsize > 0) {
494            pmtdbufp++;
495            pmtdsize--;
496        }
497    }
498    close(fd);
499}
500
501int mtd_name_to_number(const char *name)
502{
503    int n;
504    if (mtd_part_count < 0) {
505        mtd_part_count = 0;
506        find_mtd_partitions();
507    }
508    for (n = 0; n < mtd_part_count; n++) {
509        if (!strcmp(name, mtd_part_map[n].name)) {
510            return mtd_part_map[n].number;
511        }
512    }
513    return -1;
514}
515
516static void import_kernel_nv(char *name, int in_qemu)
517{
518    char *value = strchr(name, '=');
519
520    if (value == 0) return;
521    *value++ = 0;
522    if (*name == 0) return;
523
524    if (!in_qemu)
525    {
526        /* on a real device, white-list the kernel options */
527        if (!strcmp(name,"qemu")) {
528            strlcpy(qemu, value, sizeof(qemu));
529        } else if (!strcmp(name,"androidboot.console")) {
530            strlcpy(console, value, sizeof(console));
531        } else if (!strcmp(name,"androidboot.mode")) {
532            strlcpy(bootmode, value, sizeof(bootmode));
533        } else if (!strcmp(name,"androidboot.serialno")) {
534            strlcpy(serialno, value, sizeof(serialno));
535        } else if (!strcmp(name,"androidboot.baseband")) {
536            strlcpy(baseband, value, sizeof(baseband));
537        } else if (!strcmp(name,"androidboot.carrier")) {
538            strlcpy(carrier, value, sizeof(carrier));
539        } else if (!strcmp(name,"androidboot.bootloader")) {
540            strlcpy(bootloader, value, sizeof(bootloader));
541        } else if (!strcmp(name,"androidboot.hardware")) {
542            strlcpy(hardware, value, sizeof(hardware));
543        } else {
544            qemu_cmdline(name, value);
545        }
546    } else {
547        /* in the emulator, export any kernel option with the
548         * ro.kernel. prefix */
549        char  buff[32];
550        int   len = snprintf( buff, sizeof(buff), "ro.kernel.%s", name );
551        if (len < (int)sizeof(buff)) {
552            property_set( buff, value );
553        }
554    }
555}
556
557static void import_kernel_cmdline(int in_qemu)
558{
559    char cmdline[1024];
560    char *ptr;
561    int fd;
562
563    fd = open("/proc/cmdline", O_RDONLY);
564    if (fd >= 0) {
565        int n = read(fd, cmdline, 1023);
566        if (n < 0) n = 0;
567
568        /* get rid of trailing newline, it happens */
569        if (n > 0 && cmdline[n-1] == '\n') n--;
570
571        cmdline[n] = 0;
572        close(fd);
573    } else {
574        cmdline[0] = 0;
575    }
576
577    ptr = cmdline;
578    while (ptr && *ptr) {
579        char *x = strchr(ptr, ' ');
580        if (x != 0) *x++ = 0;
581        import_kernel_nv(ptr, in_qemu);
582        ptr = x;
583    }
584
585        /* don't expose the raw commandline to nonpriv processes */
586    chmod("/proc/cmdline", 0440);
587}
588
589static void get_hardware_name(void)
590{
591    char data[1024];
592    int fd, n;
593    char *x, *hw, *rev;
594
595    /* Hardware string was provided on kernel command line */
596    if (hardware[0])
597        return;
598
599    fd = open("/proc/cpuinfo", O_RDONLY);
600    if (fd < 0) return;
601
602    n = read(fd, data, 1023);
603    close(fd);
604    if (n < 0) return;
605
606    data[n] = 0;
607    hw = strstr(data, "\nHardware");
608    rev = strstr(data, "\nRevision");
609
610    if (hw) {
611        x = strstr(hw, ": ");
612        if (x) {
613            x += 2;
614            n = 0;
615            while (*x && !isspace(*x)) {
616                hardware[n++] = tolower(*x);
617                x++;
618                if (n == 31) break;
619            }
620            hardware[n] = 0;
621        }
622    }
623
624    if (rev) {
625        x = strstr(rev, ": ");
626        if (x) {
627            revision = strtoul(x + 2, 0, 16);
628        }
629    }
630}
631
632static void drain_action_queue(void)
633{
634    struct listnode *node;
635    struct command *cmd;
636    struct action *act;
637    int ret;
638
639    while ((act = action_remove_queue_head())) {
640        INFO("processing action %p (%s)\n", act, act->name);
641        list_for_each(node, &act->commands) {
642            cmd = node_to_item(node, struct command, clist);
643            ret = cmd->func(cmd->nargs, cmd->args);
644            INFO("command '%s' r=%d\n", cmd->args[0], ret);
645        }
646    }
647}
648
649void open_devnull_stdio(void)
650{
651    int fd;
652    static const char *name = "/dev/__null__";
653    if (mknod(name, S_IFCHR | 0600, (1 << 8) | 3) == 0) {
654        fd = open(name, O_RDWR);
655        unlink(name);
656        if (fd >= 0) {
657            dup2(fd, 0);
658            dup2(fd, 1);
659            dup2(fd, 2);
660            if (fd > 2) {
661                close(fd);
662            }
663            return;
664        }
665    }
666
667    exit(1);
668}
669
670int main(int argc, char **argv)
671{
672    int device_fd = -1;
673    int property_set_fd = -1;
674    int signal_recv_fd = -1;
675    int s[2];
676    int fd;
677    struct sigaction act;
678    char tmp[PROP_VALUE_MAX];
679    struct pollfd ufds[4];
680    char *tmpdev;
681
682    act.sa_handler = sigchld_handler;
683    act.sa_flags = SA_NOCLDSTOP;
684    act.sa_mask = 0;
685    act.sa_restorer = NULL;
686    sigaction(SIGCHLD, &act, 0);
687
688    /* clear the umask */
689    umask(0);
690
691        /* Get the basic filesystem setup we need put
692         * together in the initramdisk on / and then we'll
693         * let the rc file figure out the rest.
694         */
695    mkdir("/dev", 0755);
696    mkdir("/proc", 0755);
697    mkdir("/sys", 0755);
698
699    mount("tmpfs", "/dev", "tmpfs", 0, "mode=0755");
700    mkdir("/dev/pts", 0755);
701    mkdir("/dev/socket", 0755);
702    mount("devpts", "/dev/pts", "devpts", 0, NULL);
703    mount("proc", "/proc", "proc", 0, NULL);
704    mount("sysfs", "/sys", "sysfs", 0, NULL);
705
706        /* We must have some place other than / to create the
707         * device nodes for kmsg and null, otherwise we won't
708         * be able to remount / read-only later on.
709         * Now that tmpfs is mounted on /dev, we can actually
710         * talk to the outside world.
711         */
712    open_devnull_stdio();
713    log_init();
714
715    INFO("reading config file\n");
716    parse_config_file("/init.rc");
717
718    /* pull the kernel commandline and ramdisk properties file in */
719    qemu_init();
720    import_kernel_cmdline(0);
721
722    get_hardware_name();
723    snprintf(tmp, sizeof(tmp), "/init.%s.rc", hardware);
724    parse_config_file(tmp);
725
726    action_for_each_trigger("early-init", action_add_queue_tail);
727    drain_action_queue();
728
729    INFO("device init\n");
730    device_fd = device_init();
731
732    property_init();
733
734    if (console[0]) {
735        snprintf(tmp, sizeof(tmp), "/dev/%s", console);
736        console_name = strdup(tmp);
737    }
738
739    fd = open(console_name, O_RDWR);
740    if (fd >= 0)
741        have_console = 1;
742    close(fd);
743
744    if( load_565rle_image(INIT_IMAGE_FILE) ) {
745	fd = open("/dev/tty0", O_WRONLY);
746	if (fd >= 0) {
747	    const char *msg;
748            msg = "\n"
749		"\n"
750		"\n"
751		"\n"
752		"\n"
753		"\n"
754		"\n"  // console is 40 cols x 30 lines
755		"\n"
756		"\n"
757		"\n"
758		"\n"
759		"\n"
760		"\n"
761		"\n"
762		"             A N D R O I D ";
763	    write(fd, msg, strlen(msg));
764	    close(fd);
765	}
766    }
767
768    if (qemu[0])
769        import_kernel_cmdline(1);
770
771    if (!strcmp(bootmode,"factory"))
772        property_set("ro.factorytest", "1");
773    else if (!strcmp(bootmode,"factory2"))
774        property_set("ro.factorytest", "2");
775    else
776        property_set("ro.factorytest", "0");
777
778    property_set("ro.serialno", serialno[0] ? serialno : "");
779    property_set("ro.bootmode", bootmode[0] ? bootmode : "unknown");
780    property_set("ro.baseband", baseband[0] ? baseband : "unknown");
781    property_set("ro.carrier", carrier[0] ? carrier : "unknown");
782    property_set("ro.bootloader", bootloader[0] ? bootloader : "unknown");
783
784    property_set("ro.hardware", hardware);
785    snprintf(tmp, PROP_VALUE_MAX, "%d", revision);
786    property_set("ro.revision", tmp);
787
788        /* execute all the boot actions to get us started */
789    action_for_each_trigger("init", action_add_queue_tail);
790    drain_action_queue();
791
792        /* read any property files on system or data and
793         * fire up the property service.  This must happen
794         * after the ro.foo properties are set above so
795         * that /data/local.prop cannot interfere with them.
796         */
797    property_set_fd = start_property_service();
798
799    /* create a signalling mechanism for the sigchld handler */
800    if (socketpair(AF_UNIX, SOCK_STREAM, 0, s) == 0) {
801        signal_fd = s[0];
802        signal_recv_fd = s[1];
803        fcntl(s[0], F_SETFD, FD_CLOEXEC);
804        fcntl(s[0], F_SETFL, O_NONBLOCK);
805        fcntl(s[1], F_SETFD, FD_CLOEXEC);
806        fcntl(s[1], F_SETFL, O_NONBLOCK);
807    }
808
809    /* make sure we actually have all the pieces we need */
810    if ((device_fd < 0) ||
811        (property_set_fd < 0) ||
812        (signal_recv_fd < 0)) {
813        ERROR("init startup failure\n");
814        return 1;
815    }
816
817    /* execute all the boot actions to get us started */
818    action_for_each_trigger("early-boot", action_add_queue_tail);
819    action_for_each_trigger("boot", action_add_queue_tail);
820    drain_action_queue();
821
822        /* run all property triggers based on current state of the properties */
823    queue_all_property_triggers();
824    drain_action_queue();
825
826        /* enable property triggers */
827    property_triggers_enabled = 1;
828
829    ufds[0].fd = device_fd;
830    ufds[0].events = POLLIN;
831    ufds[1].fd = property_set_fd;
832    ufds[1].events = POLLIN;
833    ufds[2].fd = signal_recv_fd;
834    ufds[2].events = POLLIN;
835
836#if BOOTCHART
837    if (bootchart_init() < 0)
838        ERROR("bootcharting init failure\n");
839    else {
840        NOTICE("bootcharting started\n");
841        bootchart_count = BOOTCHART_MAX_COUNT;
842    }
843#endif
844
845    for(;;) {
846        int nr, timeout = -1;
847
848        ufds[0].revents = 0;
849        ufds[1].revents = 0;
850        ufds[2].revents = 0;
851
852        drain_action_queue();
853        restart_processes();
854
855        if (process_needs_restart) {
856            timeout = (process_needs_restart - gettime()) * 1000;
857            if (timeout < 0)
858                timeout = 0;
859        }
860
861#if BOOTCHART
862        if (bootchart_count > 0) {
863            if (timeout < 0 || timeout > BOOTCHART_POLLING_MS)
864                timeout = BOOTCHART_POLLING_MS;
865            if (bootchart_step() < 0 || --bootchart_count == 0) {
866                bootchart_finish();
867                bootchart_count = 0;
868            }
869        }
870#endif
871        nr = poll(ufds, 3, timeout);
872        if (nr <= 0)
873            continue;
874
875        if (ufds[2].revents == POLLIN) {
876            /* we got a SIGCHLD - reap and restart as needed */
877            read(signal_recv_fd, tmp, sizeof(tmp));
878            while (!wait_for_one_process(0))
879                ;
880            continue;
881        }
882
883        if (ufds[0].revents == POLLIN)
884            handle_device_fd(device_fd);
885
886        if (ufds[1].revents == POLLIN)
887            handle_property_set_fd(property_set_fd);
888    }
889
890    return 0;
891}
892