init.c revision 11e1c42df69b15c938aa1b7570e4370e6ab15a86 
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#include <linux/keychord.h>
41
42#include <sys/system_properties.h>
43
44#include "devices.h"
45#include "init.h"
46#include "property_service.h"
47#include "bootchart.h"
48
49static int property_triggers_enabled = 0;
50
51#if BOOTCHART
52static int   bootchart_count;
53#endif
54
55static char console[32];
56static char serialno[32];
57static char bootmode[32];
58static char baseband[32];
59static char carrier[32];
60static char bootloader[32];
61static char hardware[32];
62static unsigned revision = 0;
63static char qemu[32];
64static struct input_keychord *keychords = 0;
65static int keychords_count = 0;
66static int keychords_length = 0;
67
68static void notify_service_state(const char *name, const char *state)
69{
70    char pname[PROP_NAME_MAX];
71    int len = strlen(name);
72    if ((len + 10) > PROP_NAME_MAX)
73        return;
74    snprintf(pname, sizeof(pname), "init.svc.%s", name);
75    property_set(pname, state);
76}
77
78static int have_console;
79static char *console_name = "/dev/console";
80static time_t process_needs_restart;
81
82static const char *ENV[32];
83
84/* add_environment - add "key=value" to the current environment */
85int add_environment(const char *key, const char *val)
86{
87    int n;
88
89    for (n = 0; n < 31; n++) {
90        if (!ENV[n]) {
91            size_t len = strlen(key) + strlen(val) + 2;
92            char *entry = malloc(len);
93            snprintf(entry, len, "%s=%s", key, val);
94            ENV[n] = entry;
95            return 0;
96        }
97    }
98
99    return 1;
100}
101
102static void zap_stdio(void)
103{
104    int fd;
105    fd = open("/dev/null", O_RDWR);
106    dup2(fd, 0);
107    dup2(fd, 1);
108    dup2(fd, 2);
109    close(fd);
110}
111
112static void open_console()
113{
114    int fd;
115    if ((fd = open(console_name, O_RDWR)) < 0) {
116        fd = open("/dev/null", O_RDWR);
117    }
118    dup2(fd, 0);
119    dup2(fd, 1);
120    dup2(fd, 2);
121    close(fd);
122}
123
124/*
125 * gettime() - returns the time in seconds of the system's monotonic clock or
126 * zero on error.
127 */
128static time_t gettime(void)
129{
130    struct timespec ts;
131    int ret;
132
133    ret = clock_gettime(CLOCK_MONOTONIC, &ts);
134    if (ret < 0) {
135        ERROR("clock_gettime(CLOCK_MONOTONIC) failed: %s\n", strerror(errno));
136        return 0;
137    }
138
139    return ts.tv_sec;
140}
141
142static void publish_socket(const char *name, int fd)
143{
144    char key[64] = ANDROID_SOCKET_ENV_PREFIX;
145    char val[64];
146
147    strlcpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1,
148            name,
149            sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX));
150    snprintf(val, sizeof(val), "%d", fd);
151    add_environment(key, val);
152
153    /* make sure we don't close-on-exec */
154    fcntl(fd, F_SETFD, 0);
155}
156
157void service_start(struct service *svc, const char *dynamic_args)
158{
159    struct stat s;
160    pid_t pid;
161    int needs_console;
162    int n;
163
164        /* starting a service removes it from the disabled
165         * state and immediately takes it out of the restarting
166         * state if it was in there
167         */
168    svc->flags &= (~(SVC_DISABLED|SVC_RESTARTING));
169    svc->time_started = 0;
170
171        /* running processes require no additional work -- if
172         * they're in the process of exiting, we've ensured
173         * that they will immediately restart on exit, unless
174         * they are ONESHOT
175         */
176    if (svc->flags & SVC_RUNNING) {
177        return;
178    }
179
180    needs_console = (svc->flags & SVC_CONSOLE) ? 1 : 0;
181    if (needs_console && (!have_console)) {
182        ERROR("service '%s' requires console\n", svc->name);
183        svc->flags |= SVC_DISABLED;
184        return;
185    }
186
187    if (stat(svc->args[0], &s) != 0) {
188        ERROR("cannot find '%s', disabling '%s'\n", svc->args[0], svc->name);
189        svc->flags |= SVC_DISABLED;
190        return;
191    }
192
193    if ((!(svc->flags & SVC_ONESHOT)) && dynamic_args) {
194        ERROR("service '%s' must be one-shot to use dynamic args, disabling\n",
195               svc->args[0]);
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        if (!dynamic_args)
257            if (execve(svc->args[0], (char**) svc->args, (char**) ENV) < 0)
258                ERROR("cannot execve('%s'): %s\n", svc->args[0], strerror(errno));
259        else {
260            char *arg_ptrs[SVC_MAXARGS+1];
261            int arg_idx = svc->nargs;
262            char *tmp = strdup(dynamic_args);
263            char *next = tmp;
264            char *bword;
265
266            /* Copy the static arguments */
267            memcpy(arg_ptrs, svc->args, (svc->nargs * sizeof(char *)));
268
269            while((bword = strsep(&next, " "))) {
270                arg_ptrs[arg_idx++] = bword;
271                if (arg_idx == SVC_MAXARGS)
272                    break;
273            }
274            arg_ptrs[arg_idx] = '\0';
275            if (execve(svc->args[0], (char**) arg_ptrs, (char**) ENV) < 0)
276                ERROR("cannot execve('%s'): %s\n", svc->args[0], strerror(errno));
277        }
278        _exit(127);
279    }
280
281    if (pid < 0) {
282        ERROR("failed to start '%s'\n", svc->name);
283        svc->pid = 0;
284        return;
285    }
286
287    svc->time_started = gettime();
288    svc->pid = pid;
289    svc->flags |= SVC_RUNNING;
290
291    notify_service_state(svc->name, "running");
292}
293
294void service_stop(struct service *svc)
295{
296        /* we are no longer running, nor should we
297         * attempt to restart
298         */
299    svc->flags &= (~(SVC_RUNNING|SVC_RESTARTING));
300
301        /* if the service has not yet started, prevent
302         * it from auto-starting with its class
303         */
304    svc->flags |= SVC_DISABLED;
305
306    if (svc->pid) {
307        NOTICE("service '%s' is being killed\n", svc->name);
308        kill(-svc->pid, SIGTERM);
309        notify_service_state(svc->name, "stopping");
310    } else {
311        notify_service_state(svc->name, "stopped");
312    }
313}
314
315void property_changed(const char *name, const char *value)
316{
317    if (property_triggers_enabled) {
318        queue_property_triggers(name, value);
319        drain_action_queue();
320    }
321}
322
323#define CRITICAL_CRASH_THRESHOLD    4       /* if we crash >4 times ... */
324#define CRITICAL_CRASH_WINDOW       (4*60)  /* ... in 4 minutes, goto recovery*/
325
326static int wait_for_one_process(int block)
327{
328    pid_t pid;
329    int status;
330    struct service *svc;
331    struct socketinfo *si;
332    time_t now;
333    struct listnode *node;
334    struct command *cmd;
335
336    while ( (pid = waitpid(-1, &status, block ? 0 : WNOHANG)) == -1 && errno == EINTR );
337    if (pid <= 0) return -1;
338    INFO("waitpid returned pid %d, status = %08x\n", pid, status);
339
340    svc = service_find_by_pid(pid);
341    if (!svc) {
342        ERROR("untracked pid %d exited\n", pid);
343        return 0;
344    }
345
346    NOTICE("process '%s', pid %d exited\n", svc->name, pid);
347
348    if (!(svc->flags & SVC_ONESHOT)) {
349        kill(-pid, SIGKILL);
350        NOTICE("process '%s' killing any children in process group\n", svc->name);
351    }
352
353    /* remove any sockets we may have created */
354    for (si = svc->sockets; si; si = si->next) {
355        char tmp[128];
356        snprintf(tmp, sizeof(tmp), ANDROID_SOCKET_DIR"/%s", si->name);
357        unlink(tmp);
358    }
359
360    svc->pid = 0;
361    svc->flags &= (~SVC_RUNNING);
362
363        /* oneshot processes go into the disabled state on exit */
364    if (svc->flags & SVC_ONESHOT) {
365        svc->flags |= SVC_DISABLED;
366    }
367
368        /* disabled processes do not get restarted automatically */
369    if (svc->flags & SVC_DISABLED) {
370        notify_service_state(svc->name, "stopped");
371        return 0;
372    }
373
374    now = gettime();
375    if (svc->flags & SVC_CRITICAL) {
376        if (svc->time_crashed + CRITICAL_CRASH_WINDOW >= now) {
377            if (++svc->nr_crashed > CRITICAL_CRASH_THRESHOLD) {
378                ERROR("critical process '%s' exited %d times in %d minutes; "
379                      "rebooting into recovery mode\n", svc->name,
380                      CRITICAL_CRASH_THRESHOLD, CRITICAL_CRASH_WINDOW / 60);
381                sync();
382                __reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2,
383                         LINUX_REBOOT_CMD_RESTART2, "recovery");
384                return 0;
385            }
386        } else {
387            svc->time_crashed = now;
388            svc->nr_crashed = 1;
389        }
390    }
391
392    /* Execute all onrestart commands for this service. */
393    list_for_each(node, &svc->onrestart.commands) {
394        cmd = node_to_item(node, struct command, clist);
395        cmd->func(cmd->nargs, cmd->args);
396    }
397    svc->flags |= SVC_RESTARTING;
398    notify_service_state(svc->name, "restarting");
399    return 0;
400}
401
402static void restart_service_if_needed(struct service *svc)
403{
404    time_t next_start_time = svc->time_started + 5;
405
406    if (next_start_time <= gettime()) {
407        svc->flags &= (~SVC_RESTARTING);
408        service_start(svc, NULL);
409        return;
410    }
411
412    if ((next_start_time < process_needs_restart) ||
413        (process_needs_restart == 0)) {
414        process_needs_restart = next_start_time;
415    }
416}
417
418static void restart_processes()
419{
420    process_needs_restart = 0;
421    service_for_each_flags(SVC_RESTARTING,
422                           restart_service_if_needed);
423}
424
425static int signal_fd = -1;
426
427static void sigchld_handler(int s)
428{
429    write(signal_fd, &s, 1);
430}
431
432static void msg_start(const char *name)
433{
434    struct service *svc;
435    char *tmp = NULL;
436    char *args = NULL;
437
438    if (!strchr(name, ':'))
439        svc = service_find_by_name(name);
440    else {
441        tmp = strdup(name);
442        args = strchr(tmp, ':');
443        *args = '\0';
444        args++;
445
446        svc = service_find_by_name(tmp);
447    }
448
449    if (svc) {
450        service_start(svc, args);
451    } else {
452        ERROR("no such service '%s'\n", name);
453    }
454    if (tmp)
455        free(tmp);
456}
457
458static void msg_stop(const char *name)
459{
460    struct service *svc = service_find_by_name(name);
461
462    if (svc) {
463        service_stop(svc);
464    } else {
465        ERROR("no such service '%s'\n", name);
466    }
467}
468
469void handle_control_message(const char *msg, const char *arg)
470{
471    if (!strcmp(msg,"start")) {
472        msg_start(arg);
473    } else if (!strcmp(msg,"stop")) {
474        msg_stop(arg);
475    } else {
476        ERROR("unknown control msg '%s'\n", msg);
477    }
478}
479
480#define MAX_MTD_PARTITIONS 16
481
482static struct {
483    char name[16];
484    int number;
485} mtd_part_map[MAX_MTD_PARTITIONS];
486
487static int mtd_part_count = -1;
488
489static void find_mtd_partitions(void)
490{
491    int fd;
492    char buf[1024];
493    char *pmtdbufp;
494    ssize_t pmtdsize;
495    int r;
496
497    fd = open("/proc/mtd", O_RDONLY);
498    if (fd < 0)
499        return;
500
501    buf[sizeof(buf) - 1] = '\0';
502    pmtdsize = read(fd, buf, sizeof(buf) - 1);
503    pmtdbufp = buf;
504    while (pmtdsize > 0) {
505        int mtdnum, mtdsize, mtderasesize;
506        char mtdname[16];
507        mtdname[0] = '\0';
508        mtdnum = -1;
509        r = sscanf(pmtdbufp, "mtd%d: %x %x %15s",
510                   &mtdnum, &mtdsize, &mtderasesize, mtdname);
511        if ((r == 4) && (mtdname[0] == '"')) {
512            char *x = strchr(mtdname + 1, '"');
513            if (x) {
514                *x = 0;
515            }
516            INFO("mtd partition %d, %s\n", mtdnum, mtdname + 1);
517            if (mtd_part_count < MAX_MTD_PARTITIONS) {
518                strcpy(mtd_part_map[mtd_part_count].name, mtdname + 1);
519                mtd_part_map[mtd_part_count].number = mtdnum;
520                mtd_part_count++;
521            } else {
522                ERROR("too many mtd partitions\n");
523            }
524        }
525        while (pmtdsize > 0 && *pmtdbufp != '\n') {
526            pmtdbufp++;
527            pmtdsize--;
528        }
529        if (pmtdsize > 0) {
530            pmtdbufp++;
531            pmtdsize--;
532        }
533    }
534    close(fd);
535}
536
537int mtd_name_to_number(const char *name)
538{
539    int n;
540    if (mtd_part_count < 0) {
541        mtd_part_count = 0;
542        find_mtd_partitions();
543    }
544    for (n = 0; n < mtd_part_count; n++) {
545        if (!strcmp(name, mtd_part_map[n].name)) {
546            return mtd_part_map[n].number;
547        }
548    }
549    return -1;
550}
551
552static void import_kernel_nv(char *name, int in_qemu)
553{
554    char *value = strchr(name, '=');
555
556    if (value == 0) return;
557    *value++ = 0;
558    if (*name == 0) return;
559
560    if (!in_qemu)
561    {
562        /* on a real device, white-list the kernel options */
563        if (!strcmp(name,"qemu")) {
564            strlcpy(qemu, value, sizeof(qemu));
565        } else if (!strcmp(name,"androidboot.console")) {
566            strlcpy(console, value, sizeof(console));
567        } else if (!strcmp(name,"androidboot.mode")) {
568            strlcpy(bootmode, value, sizeof(bootmode));
569        } else if (!strcmp(name,"androidboot.serialno")) {
570            strlcpy(serialno, value, sizeof(serialno));
571        } else if (!strcmp(name,"androidboot.baseband")) {
572            strlcpy(baseband, value, sizeof(baseband));
573        } else if (!strcmp(name,"androidboot.carrier")) {
574            strlcpy(carrier, value, sizeof(carrier));
575        } else if (!strcmp(name,"androidboot.bootloader")) {
576            strlcpy(bootloader, value, sizeof(bootloader));
577        } else if (!strcmp(name,"androidboot.hardware")) {
578            strlcpy(hardware, value, sizeof(hardware));
579        } else {
580            qemu_cmdline(name, value);
581        }
582    } else {
583        /* in the emulator, export any kernel option with the
584         * ro.kernel. prefix */
585        char  buff[32];
586        int   len = snprintf( buff, sizeof(buff), "ro.kernel.%s", name );
587        if (len < (int)sizeof(buff)) {
588            property_set( buff, value );
589        }
590    }
591}
592
593static void import_kernel_cmdline(int in_qemu)
594{
595    char cmdline[1024];
596    char *ptr;
597    int fd;
598
599    fd = open("/proc/cmdline", O_RDONLY);
600    if (fd >= 0) {
601        int n = read(fd, cmdline, 1023);
602        if (n < 0) n = 0;
603
604        /* get rid of trailing newline, it happens */
605        if (n > 0 && cmdline[n-1] == '\n') n--;
606
607        cmdline[n] = 0;
608        close(fd);
609    } else {
610        cmdline[0] = 0;
611    }
612
613    ptr = cmdline;
614    while (ptr && *ptr) {
615        char *x = strchr(ptr, ' ');
616        if (x != 0) *x++ = 0;
617        import_kernel_nv(ptr, in_qemu);
618        ptr = x;
619    }
620
621        /* don't expose the raw commandline to nonpriv processes */
622    chmod("/proc/cmdline", 0440);
623}
624
625static void get_hardware_name(void)
626{
627    char data[1024];
628    int fd, n;
629    char *x, *hw, *rev;
630
631    /* Hardware string was provided on kernel command line */
632    if (hardware[0])
633        return;
634
635    fd = open("/proc/cpuinfo", O_RDONLY);
636    if (fd < 0) return;
637
638    n = read(fd, data, 1023);
639    close(fd);
640    if (n < 0) return;
641
642    data[n] = 0;
643    hw = strstr(data, "\nHardware");
644    rev = strstr(data, "\nRevision");
645
646    if (hw) {
647        x = strstr(hw, ": ");
648        if (x) {
649            x += 2;
650            n = 0;
651            while (*x && !isspace(*x)) {
652                hardware[n++] = tolower(*x);
653                x++;
654                if (n == 31) break;
655            }
656            hardware[n] = 0;
657        }
658    }
659
660    if (rev) {
661        x = strstr(rev, ": ");
662        if (x) {
663            revision = strtoul(x + 2, 0, 16);
664        }
665    }
666}
667
668void drain_action_queue(void)
669{
670    struct listnode *node;
671    struct command *cmd;
672    struct action *act;
673    int ret;
674
675    while ((act = action_remove_queue_head())) {
676        INFO("processing action %p (%s)\n", act, act->name);
677        list_for_each(node, &act->commands) {
678            cmd = node_to_item(node, struct command, clist);
679            ret = cmd->func(cmd->nargs, cmd->args);
680            INFO("command '%s' r=%d\n", cmd->args[0], ret);
681        }
682    }
683}
684
685void open_devnull_stdio(void)
686{
687    int fd;
688    static const char *name = "/dev/__null__";
689    if (mknod(name, S_IFCHR | 0600, (1 << 8) | 3) == 0) {
690        fd = open(name, O_RDWR);
691        unlink(name);
692        if (fd >= 0) {
693            dup2(fd, 0);
694            dup2(fd, 1);
695            dup2(fd, 2);
696            if (fd > 2) {
697                close(fd);
698            }
699            return;
700        }
701    }
702
703    exit(1);
704}
705
706void add_service_keycodes(struct service *svc)
707{
708    struct input_keychord *keychord;
709    int i, size;
710
711    if (svc->keycodes) {
712        /* add a new keychord to the list */
713        size = sizeof(*keychord) + svc->nkeycodes * sizeof(keychord->keycodes[0]);
714        keychords = realloc(keychords, keychords_length + size);
715        if (!keychords) {
716            ERROR("could not allocate keychords\n");
717            keychords_length = 0;
718            keychords_count = 0;
719            return;
720        }
721
722        keychord = (struct input_keychord *)((char *)keychords + keychords_length);
723        keychord->version = KEYCHORD_VERSION;
724        keychord->id = keychords_count + 1;
725        keychord->count = svc->nkeycodes;
726        svc->keychord_id = keychord->id;
727
728        for (i = 0; i < svc->nkeycodes; i++) {
729            keychord->keycodes[i] = svc->keycodes[i];
730        }
731        keychords_count++;
732        keychords_length += size;
733    }
734}
735
736int open_keychord()
737{
738    int fd, ret;
739
740    service_for_each(add_service_keycodes);
741
742    /* nothing to do if no services require keychords */
743    if (!keychords)
744        return -1;
745
746    fd = open("/dev/keychord", O_RDWR);
747    if (fd < 0) {
748        ERROR("could not open /dev/keychord\n");
749        return fd;
750    }
751    fcntl(fd, F_SETFD, FD_CLOEXEC);
752
753    ret = write(fd, keychords, keychords_length);
754    if (ret != keychords_length) {
755        ERROR("could not configure /dev/keychord %d (%d)\n", ret, errno);
756        close(fd);
757        fd = -1;
758    }
759
760    free(keychords);
761    keychords = 0;
762
763    return fd;
764}
765
766void handle_keychord(int fd)
767{
768    struct service *svc;
769    int ret;
770    __u16 id;
771
772    ret = read(fd, &id, sizeof(id));
773    if (ret != sizeof(id)) {
774        ERROR("could not read keychord id\n");
775        return;
776    }
777
778    svc = service_find_by_keychord(id);
779    if (svc) {
780        INFO("starting service %s from keychord\n", svc->name);
781        service_start(svc, NULL);
782    } else {
783        ERROR("service for keychord %d not found\n", id);
784    }
785}
786
787int main(int argc, char **argv)
788{
789    int device_fd = -1;
790    int property_set_fd = -1;
791    int signal_recv_fd = -1;
792    int keychord_fd = -1;
793    int fd_count;
794    int s[2];
795    int fd;
796    struct sigaction act;
797    char tmp[PROP_VALUE_MAX];
798    struct pollfd ufds[4];
799    char *tmpdev;
800    char* debuggable;
801
802    act.sa_handler = sigchld_handler;
803    act.sa_flags = SA_NOCLDSTOP;
804    act.sa_mask = 0;
805    act.sa_restorer = NULL;
806    sigaction(SIGCHLD, &act, 0);
807
808    /* clear the umask */
809    umask(0);
810
811        /* Get the basic filesystem setup we need put
812         * together in the initramdisk on / and then we'll
813         * let the rc file figure out the rest.
814         */
815    mkdir("/dev", 0755);
816    mkdir("/proc", 0755);
817    mkdir("/sys", 0755);
818
819    mount("tmpfs", "/dev", "tmpfs", 0, "mode=0755");
820    mkdir("/dev/pts", 0755);
821    mkdir("/dev/socket", 0755);
822    mount("devpts", "/dev/pts", "devpts", 0, NULL);
823    mount("proc", "/proc", "proc", 0, NULL);
824    mount("sysfs", "/sys", "sysfs", 0, NULL);
825
826        /* We must have some place other than / to create the
827         * device nodes for kmsg and null, otherwise we won't
828         * be able to remount / read-only later on.
829         * Now that tmpfs is mounted on /dev, we can actually
830         * talk to the outside world.
831         */
832    open_devnull_stdio();
833    log_init();
834
835    INFO("reading config file\n");
836    parse_config_file("/init.rc");
837
838    /* pull the kernel commandline and ramdisk properties file in */
839    qemu_init();
840    import_kernel_cmdline(0);
841
842    get_hardware_name();
843    snprintf(tmp, sizeof(tmp), "/init.%s.rc", hardware);
844    parse_config_file(tmp);
845
846    action_for_each_trigger("early-init", action_add_queue_tail);
847    drain_action_queue();
848
849    INFO("device init\n");
850    device_fd = device_init();
851
852    property_init();
853
854    // only listen for keychords if ro.debuggable is true
855    debuggable = property_get("ro.debuggable");
856    if (debuggable && !strcmp(debuggable, "1")) {
857        keychord_fd = open_keychord();
858    }
859
860    if (console[0]) {
861        snprintf(tmp, sizeof(tmp), "/dev/%s", console);
862        console_name = strdup(tmp);
863    }
864
865    fd = open(console_name, O_RDWR);
866    if (fd >= 0)
867        have_console = 1;
868    close(fd);
869
870    if( load_565rle_image(INIT_IMAGE_FILE) ) {
871    fd = open("/dev/tty0", O_WRONLY);
872    if (fd >= 0) {
873        const char *msg;
874            msg = "\n"
875        "\n"
876        "\n"
877        "\n"
878        "\n"
879        "\n"
880        "\n"  // console is 40 cols x 30 lines
881        "\n"
882        "\n"
883        "\n"
884        "\n"
885        "\n"
886        "\n"
887        "\n"
888        "             A N D R O I D ";
889        write(fd, msg, strlen(msg));
890        close(fd);
891    }
892    }
893
894    if (qemu[0])
895        import_kernel_cmdline(1);
896
897    if (!strcmp(bootmode,"factory"))
898        property_set("ro.factorytest", "1");
899    else if (!strcmp(bootmode,"factory2"))
900        property_set("ro.factorytest", "2");
901    else
902        property_set("ro.factorytest", "0");
903
904    property_set("ro.serialno", serialno[0] ? serialno : "");
905    property_set("ro.bootmode", bootmode[0] ? bootmode : "unknown");
906    property_set("ro.baseband", baseband[0] ? baseband : "unknown");
907    property_set("ro.carrier", carrier[0] ? carrier : "unknown");
908    property_set("ro.bootloader", bootloader[0] ? bootloader : "unknown");
909
910    property_set("ro.hardware", hardware);
911    snprintf(tmp, PROP_VALUE_MAX, "%d", revision);
912    property_set("ro.revision", tmp);
913
914        /* execute all the boot actions to get us started */
915    action_for_each_trigger("init", action_add_queue_tail);
916    drain_action_queue();
917
918        /* read any property files on system or data and
919         * fire up the property service.  This must happen
920         * after the ro.foo properties are set above so
921         * that /data/local.prop cannot interfere with them.
922         */
923    property_set_fd = start_property_service();
924
925    /* create a signalling mechanism for the sigchld handler */
926    if (socketpair(AF_UNIX, SOCK_STREAM, 0, s) == 0) {
927        signal_fd = s[0];
928        signal_recv_fd = s[1];
929        fcntl(s[0], F_SETFD, FD_CLOEXEC);
930        fcntl(s[0], F_SETFL, O_NONBLOCK);
931        fcntl(s[1], F_SETFD, FD_CLOEXEC);
932        fcntl(s[1], F_SETFL, O_NONBLOCK);
933    }
934
935    /* make sure we actually have all the pieces we need */
936    if ((device_fd < 0) ||
937        (property_set_fd < 0) ||
938        (signal_recv_fd < 0)) {
939        ERROR("init startup failure\n");
940        return 1;
941    }
942
943    /* execute all the boot actions to get us started */
944    action_for_each_trigger("early-boot", action_add_queue_tail);
945    action_for_each_trigger("boot", action_add_queue_tail);
946    drain_action_queue();
947
948        /* run all property triggers based on current state of the properties */
949    queue_all_property_triggers();
950    drain_action_queue();
951
952        /* enable property triggers */
953    property_triggers_enabled = 1;
954
955    ufds[0].fd = device_fd;
956    ufds[0].events = POLLIN;
957    ufds[1].fd = property_set_fd;
958    ufds[1].events = POLLIN;
959    ufds[2].fd = signal_recv_fd;
960    ufds[2].events = POLLIN;
961    fd_count = 3;
962
963    if (keychord_fd > 0) {
964        ufds[3].fd = keychord_fd;
965        ufds[3].events = POLLIN;
966        fd_count++;
967    } else {
968        ufds[3].events = 0;
969        ufds[3].revents = 0;
970    }
971
972#if BOOTCHART
973    bootchart_count = bootchart_init();
974    if (bootchart_count < 0) {
975        ERROR("bootcharting init failure\n");
976    } else if (bootchart_count > 0) {
977        NOTICE("bootcharting started (period=%d ms)\n", bootchart_count*BOOTCHART_POLLING_MS);
978    } else {
979        NOTICE("bootcharting ignored\n");
980    }
981#endif
982
983    for(;;) {
984        int nr, i, timeout = -1;
985
986        for (i = 0; i < fd_count; i++)
987            ufds[i].revents = 0;
988
989        drain_action_queue();
990        restart_processes();
991
992        if (process_needs_restart) {
993            timeout = (process_needs_restart - gettime()) * 1000;
994            if (timeout < 0)
995                timeout = 0;
996        }
997
998#if BOOTCHART
999        if (bootchart_count > 0) {
1000            if (timeout < 0 || timeout > BOOTCHART_POLLING_MS)
1001                timeout = BOOTCHART_POLLING_MS;
1002            if (bootchart_step() < 0 || --bootchart_count == 0) {
1003                bootchart_finish();
1004                bootchart_count = 0;
1005            }
1006        }
1007#endif
1008        nr = poll(ufds, fd_count, timeout);
1009        if (nr <= 0)
1010            continue;
1011
1012        if (ufds[2].revents == POLLIN) {
1013            /* we got a SIGCHLD - reap and restart as needed */
1014            read(signal_recv_fd, tmp, sizeof(tmp));
1015            while (!wait_for_one_process(0))
1016                ;
1017            continue;
1018        }
1019
1020        if (ufds[0].revents == POLLIN)
1021            handle_device_fd(device_fd);
1022
1023        if (ufds[1].revents == POLLIN)
1024            handle_property_set_fd(property_set_fd);
1025        if (ufds[3].revents == POLLIN)
1026            handle_keychord(keychord_fd);
1027    }
1028
1029    return 0;
1030}
1031