init.c revision 1a6f4c3bf29a4d474c4582e70fb279d0d28fb7f1 
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 <selinux/selinux.h>
36#include <selinux/label.h>
37#include <selinux/android.h>
38
39#include <libgen.h>
40
41#include <cutils/list.h>
42#include <cutils/sockets.h>
43#include <cutils/iosched_policy.h>
44#include <private/android_filesystem_config.h>
45#include <termios.h>
46
47#include <sys/system_properties.h>
48
49#include "devices.h"
50#include "init.h"
51#include "log.h"
52#include "property_service.h"
53#include "bootchart.h"
54#include "signal_handler.h"
55#include "keychords.h"
56#include "init_parser.h"
57#include "util.h"
58#include "ueventd.h"
59#include "watchdogd.h"
60
61struct selabel_handle *sehandle;
62struct selabel_handle *sehandle_prop;
63
64static int property_triggers_enabled = 0;
65
66#if BOOTCHART
67static int   bootchart_count;
68#endif
69
70static char console[32];
71static char bootmode[32];
72static char hardware[32];
73static unsigned revision = 0;
74static char qemu[32];
75
76static int selinux_enabled = 1;
77
78static struct action *cur_action = NULL;
79static struct command *cur_command = NULL;
80static struct listnode *command_queue = NULL;
81
82void notify_service_state(const char *name, const char *state)
83{
84    char pname[PROP_NAME_MAX];
85    int len = strlen(name);
86    if ((len + 10) > PROP_NAME_MAX)
87        return;
88    snprintf(pname, sizeof(pname), "init.svc.%s", name);
89    property_set(pname, state);
90}
91
92static int have_console;
93static char console_name[PROP_VALUE_MAX] = "/dev/console";
94static time_t process_needs_restart;
95
96static const char *ENV[32];
97
98/* add_environment - add "key=value" to the current environment */
99int add_environment(const char *key, const char *val)
100{
101    int n;
102
103    for (n = 0; n < 31; n++) {
104        if (!ENV[n]) {
105            size_t len = strlen(key) + strlen(val) + 2;
106            char *entry = malloc(len);
107            snprintf(entry, len, "%s=%s", key, val);
108            ENV[n] = entry;
109            return 0;
110        }
111    }
112
113    return 1;
114}
115
116static void zap_stdio(void)
117{
118    int fd;
119    fd = open("/dev/null", O_RDWR);
120    dup2(fd, 0);
121    dup2(fd, 1);
122    dup2(fd, 2);
123    close(fd);
124}
125
126static void open_console()
127{
128    int fd;
129    if ((fd = open(console_name, O_RDWR)) < 0) {
130        fd = open("/dev/null", O_RDWR);
131    }
132    ioctl(fd, TIOCSCTTY, 0);
133    dup2(fd, 0);
134    dup2(fd, 1);
135    dup2(fd, 2);
136    close(fd);
137}
138
139static void publish_socket(const char *name, int fd)
140{
141    char key[64] = ANDROID_SOCKET_ENV_PREFIX;
142    char val[64];
143
144    strlcpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1,
145            name,
146            sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX));
147    snprintf(val, sizeof(val), "%d", fd);
148    add_environment(key, val);
149
150    /* make sure we don't close-on-exec */
151    fcntl(fd, F_SETFD, 0);
152}
153
154void service_start(struct service *svc, const char *dynamic_args)
155{
156    struct stat s;
157    pid_t pid;
158    int needs_console;
159    int n;
160    char *scon = NULL;
161    int rc;
162
163        /* starting a service removes it from the disabled or reset
164         * state and immediately takes it out of the restarting
165         * state if it was in there
166         */
167    svc->flags &= (~(SVC_DISABLED|SVC_RESTARTING|SVC_RESET));
168    svc->time_started = 0;
169
170        /* running processes require no additional work -- if
171         * they're in the process of exiting, we've ensured
172         * that they will immediately restart on exit, unless
173         * they are ONESHOT
174         */
175    if (svc->flags & SVC_RUNNING) {
176        return;
177    }
178
179    needs_console = (svc->flags & SVC_CONSOLE) ? 1 : 0;
180    if (needs_console && (!have_console)) {
181        ERROR("service '%s' requires console\n", svc->name);
182        svc->flags |= SVC_DISABLED;
183        return;
184    }
185
186    if (stat(svc->args[0], &s) != 0) {
187        ERROR("cannot find '%s', disabling '%s'\n", svc->args[0], svc->name);
188        svc->flags |= SVC_DISABLED;
189        return;
190    }
191
192    if ((!(svc->flags & SVC_ONESHOT)) && dynamic_args) {
193        ERROR("service '%s' must be one-shot to use dynamic args, disabling\n",
194               svc->args[0]);
195        svc->flags |= SVC_DISABLED;
196        return;
197    }
198
199    if (is_selinux_enabled() > 0) {
200        if (svc->seclabel) {
201            scon = strdup(svc->seclabel);
202            if (!scon) {
203                ERROR("Out of memory while starting '%s'\n", svc->name);
204                return;
205            }
206        } else {
207            char *mycon = NULL, *fcon = NULL;
208
209            INFO("computing context for service '%s'\n", svc->args[0]);
210            rc = getcon(&mycon);
211            if (rc < 0) {
212                ERROR("could not get context while starting '%s'\n", svc->name);
213                return;
214            }
215
216            rc = getfilecon(svc->args[0], &fcon);
217            if (rc < 0) {
218                ERROR("could not get context while starting '%s'\n", svc->name);
219                freecon(mycon);
220                return;
221            }
222
223            rc = security_compute_create(mycon, fcon, string_to_security_class("process"), &scon);
224            freecon(mycon);
225            freecon(fcon);
226            if (rc < 0) {
227                ERROR("could not get context while starting '%s'\n", svc->name);
228                return;
229            }
230        }
231    }
232
233    NOTICE("starting '%s'\n", svc->name);
234
235    pid = fork();
236
237    if (pid == 0) {
238        struct socketinfo *si;
239        struct svcenvinfo *ei;
240        char tmp[32];
241        int fd, sz;
242
243        umask(077);
244        if (properties_inited()) {
245            get_property_workspace(&fd, &sz);
246            sprintf(tmp, "%d,%d", dup(fd), sz);
247            add_environment("ANDROID_PROPERTY_WORKSPACE", tmp);
248        }
249
250        for (ei = svc->envvars; ei; ei = ei->next)
251            add_environment(ei->name, ei->value);
252
253        setsockcreatecon(scon);
254
255        for (si = svc->sockets; si; si = si->next) {
256            int socket_type = (
257                    !strcmp(si->type, "stream") ? SOCK_STREAM :
258                        (!strcmp(si->type, "dgram") ? SOCK_DGRAM : SOCK_SEQPACKET));
259            int s = create_socket(si->name, socket_type,
260                                  si->perm, si->uid, si->gid);
261            if (s >= 0) {
262                publish_socket(si->name, s);
263            }
264        }
265
266        freecon(scon);
267        scon = NULL;
268        setsockcreatecon(NULL);
269
270        if (svc->ioprio_class != IoSchedClass_NONE) {
271            if (android_set_ioprio(getpid(), svc->ioprio_class, svc->ioprio_pri)) {
272                ERROR("Failed to set pid %d ioprio = %d,%d: %s\n",
273                      getpid(), svc->ioprio_class, svc->ioprio_pri, strerror(errno));
274            }
275        }
276
277        if (needs_console) {
278            setsid();
279            open_console();
280        } else {
281            zap_stdio();
282        }
283
284#if 0
285        for (n = 0; svc->args[n]; n++) {
286            INFO("args[%d] = '%s'\n", n, svc->args[n]);
287        }
288        for (n = 0; ENV[n]; n++) {
289            INFO("env[%d] = '%s'\n", n, ENV[n]);
290        }
291#endif
292
293        setpgid(0, getpid());
294
295    /* as requested, set our gid, supplemental gids, and uid */
296        if (svc->gid) {
297            if (setgid(svc->gid) != 0) {
298                ERROR("setgid failed: %s\n", strerror(errno));
299                _exit(127);
300            }
301        }
302        if (svc->nr_supp_gids) {
303            if (setgroups(svc->nr_supp_gids, svc->supp_gids) != 0) {
304                ERROR("setgroups failed: %s\n", strerror(errno));
305                _exit(127);
306            }
307        }
308        if (svc->uid) {
309            if (setuid(svc->uid) != 0) {
310                ERROR("setuid failed: %s\n", strerror(errno));
311                _exit(127);
312            }
313        }
314        if (svc->seclabel) {
315            if (is_selinux_enabled() > 0 && setexeccon(svc->seclabel) < 0) {
316                ERROR("cannot setexeccon('%s'): %s\n", svc->seclabel, strerror(errno));
317                _exit(127);
318            }
319        }
320
321        if (!dynamic_args) {
322            if (execve(svc->args[0], (char**) svc->args, (char**) ENV) < 0) {
323                ERROR("cannot execve('%s'): %s\n", svc->args[0], strerror(errno));
324            }
325        } else {
326            char *arg_ptrs[INIT_PARSER_MAXARGS+1];
327            int arg_idx = svc->nargs;
328            char *tmp = strdup(dynamic_args);
329            char *next = tmp;
330            char *bword;
331
332            /* Copy the static arguments */
333            memcpy(arg_ptrs, svc->args, (svc->nargs * sizeof(char *)));
334
335            while((bword = strsep(&next, " "))) {
336                arg_ptrs[arg_idx++] = bword;
337                if (arg_idx == INIT_PARSER_MAXARGS)
338                    break;
339            }
340            arg_ptrs[arg_idx] = '\0';
341            execve(svc->args[0], (char**) arg_ptrs, (char**) ENV);
342        }
343        _exit(127);
344    }
345
346    freecon(scon);
347
348    if (pid < 0) {
349        ERROR("failed to start '%s'\n", svc->name);
350        svc->pid = 0;
351        return;
352    }
353
354    svc->time_started = gettime();
355    svc->pid = pid;
356    svc->flags |= SVC_RUNNING;
357
358    if (properties_inited())
359        notify_service_state(svc->name, "running");
360}
361
362/* The how field should be either SVC_DISABLED or SVC_RESET */
363static void service_stop_or_reset(struct service *svc, int how)
364{
365        /* we are no longer running, nor should we
366         * attempt to restart
367         */
368    svc->flags &= (~(SVC_RUNNING|SVC_RESTARTING));
369
370    if ((how != SVC_DISABLED) && (how != SVC_RESET)) {
371        /* Hrm, an illegal flag.  Default to SVC_DISABLED */
372        how = SVC_DISABLED;
373    }
374        /* if the service has not yet started, prevent
375         * it from auto-starting with its class
376         */
377    if (how == SVC_RESET) {
378        svc->flags |= (svc->flags & SVC_RC_DISABLED) ? SVC_DISABLED : SVC_RESET;
379    } else {
380        svc->flags |= how;
381    }
382
383    if (svc->pid) {
384        NOTICE("service '%s' is being killed\n", svc->name);
385        kill(-svc->pid, SIGKILL);
386        notify_service_state(svc->name, "stopping");
387    } else {
388        notify_service_state(svc->name, "stopped");
389    }
390}
391
392void service_reset(struct service *svc)
393{
394    service_stop_or_reset(svc, SVC_RESET);
395}
396
397void service_stop(struct service *svc)
398{
399    service_stop_or_reset(svc, SVC_DISABLED);
400}
401
402void property_changed(const char *name, const char *value)
403{
404    if (property_triggers_enabled)
405        queue_property_triggers(name, value);
406}
407
408static void restart_service_if_needed(struct service *svc)
409{
410    time_t next_start_time = svc->time_started + 5;
411
412    if (next_start_time <= gettime()) {
413        svc->flags &= (~SVC_RESTARTING);
414        service_start(svc, NULL);
415        return;
416    }
417
418    if ((next_start_time < process_needs_restart) ||
419        (process_needs_restart == 0)) {
420        process_needs_restart = next_start_time;
421    }
422}
423
424static void restart_processes()
425{
426    process_needs_restart = 0;
427    service_for_each_flags(SVC_RESTARTING,
428                           restart_service_if_needed);
429}
430
431static void msg_start(const char *name)
432{
433    struct service *svc = NULL;
434    char *tmp = NULL;
435    char *args = NULL;
436
437    if (!strchr(name, ':'))
438        svc = service_find_by_name(name);
439    else {
440        tmp = strdup(name);
441        if (tmp) {
442            args = strchr(tmp, ':');
443            *args = '\0';
444            args++;
445
446            svc = service_find_by_name(tmp);
447        }
448    }
449
450    if (svc) {
451        service_start(svc, args);
452    } else {
453        ERROR("no such service '%s'\n", name);
454    }
455    if (tmp)
456        free(tmp);
457}
458
459static void msg_stop(const char *name)
460{
461    struct service *svc = service_find_by_name(name);
462
463    if (svc) {
464        service_stop(svc);
465    } else {
466        ERROR("no such service '%s'\n", name);
467    }
468}
469
470void handle_control_message(const char *msg, const char *arg)
471{
472    if (!strcmp(msg,"start")) {
473        msg_start(arg);
474    } else if (!strcmp(msg,"stop")) {
475        msg_stop(arg);
476    } else if (!strcmp(msg,"restart")) {
477        msg_stop(arg);
478        msg_start(arg);
479    } else {
480        ERROR("unknown control msg '%s'\n", msg);
481    }
482}
483
484static struct command *get_first_command(struct action *act)
485{
486    struct listnode *node;
487    node = list_head(&act->commands);
488    if (!node || list_empty(&act->commands))
489        return NULL;
490
491    return node_to_item(node, struct command, clist);
492}
493
494static struct command *get_next_command(struct action *act, struct command *cmd)
495{
496    struct listnode *node;
497    node = cmd->clist.next;
498    if (!node)
499        return NULL;
500    if (node == &act->commands)
501        return NULL;
502
503    return node_to_item(node, struct command, clist);
504}
505
506static int is_last_command(struct action *act, struct command *cmd)
507{
508    return (list_tail(&act->commands) == &cmd->clist);
509}
510
511void execute_one_command(void)
512{
513    int ret;
514
515    if (!cur_action || !cur_command || is_last_command(cur_action, cur_command)) {
516        cur_action = action_remove_queue_head();
517        cur_command = NULL;
518        if (!cur_action)
519            return;
520        INFO("processing action %p (%s)\n", cur_action, cur_action->name);
521        cur_command = get_first_command(cur_action);
522    } else {
523        cur_command = get_next_command(cur_action, cur_command);
524    }
525
526    if (!cur_command)
527        return;
528
529    ret = cur_command->func(cur_command->nargs, cur_command->args);
530    INFO("command '%s' r=%d\n", cur_command->args[0], ret);
531}
532
533static int wait_for_coldboot_done_action(int nargs, char **args)
534{
535    int ret;
536    INFO("wait for %s\n", coldboot_done);
537    ret = wait_for_file(coldboot_done, COMMAND_RETRY_TIMEOUT);
538    if (ret)
539        ERROR("Timed out waiting for %s\n", coldboot_done);
540    return ret;
541}
542
543static int keychord_init_action(int nargs, char **args)
544{
545    keychord_init();
546    return 0;
547}
548
549static int console_init_action(int nargs, char **args)
550{
551    int fd;
552
553    if (console[0]) {
554        snprintf(console_name, sizeof(console_name), "/dev/%s", console);
555    }
556
557    fd = open(console_name, O_RDWR);
558    if (fd >= 0)
559        have_console = 1;
560    close(fd);
561
562    if( load_565rle_image(INIT_IMAGE_FILE) ) {
563        fd = open("/dev/tty0", O_WRONLY);
564        if (fd >= 0) {
565            const char *msg;
566                msg = "\n"
567            "\n"
568            "\n"
569            "\n"
570            "\n"
571            "\n"
572            "\n"  // console is 40 cols x 30 lines
573            "\n"
574            "\n"
575            "\n"
576            "\n"
577            "\n"
578            "\n"
579            "\n"
580            "             A N D R O I D ";
581            write(fd, msg, strlen(msg));
582            close(fd);
583        }
584    }
585    return 0;
586}
587
588static void import_kernel_nv(char *name, int for_emulator)
589{
590    char *value = strchr(name, '=');
591    int name_len = strlen(name);
592
593    if (value == 0) return;
594    *value++ = 0;
595    if (name_len == 0) return;
596
597    if (!strcmp(name,"selinux")) {
598        selinux_enabled = atoi(value);
599    }
600
601    if (for_emulator) {
602        /* in the emulator, export any kernel option with the
603         * ro.kernel. prefix */
604        char buff[PROP_NAME_MAX];
605        int len = snprintf( buff, sizeof(buff), "ro.kernel.%s", name );
606
607        if (len < (int)sizeof(buff))
608            property_set( buff, value );
609        return;
610    }
611
612    if (!strcmp(name,"qemu")) {
613        strlcpy(qemu, value, sizeof(qemu));
614    } else if (!strncmp(name, "androidboot.", 12) && name_len > 12) {
615        const char *boot_prop_name = name + 12;
616        char prop[PROP_NAME_MAX];
617        int cnt;
618
619        cnt = snprintf(prop, sizeof(prop), "ro.boot.%s", boot_prop_name);
620        if (cnt < PROP_NAME_MAX)
621            property_set(prop, value);
622    }
623}
624
625static void export_kernel_boot_props(void)
626{
627    char tmp[PROP_VALUE_MAX];
628    int ret;
629    unsigned i;
630    struct {
631        const char *src_prop;
632        const char *dest_prop;
633        const char *def_val;
634    } prop_map[] = {
635        { "ro.boot.serialno", "ro.serialno", "", },
636        { "ro.boot.mode", "ro.bootmode", "unknown", },
637        { "ro.boot.baseband", "ro.baseband", "unknown", },
638        { "ro.boot.bootloader", "ro.bootloader", "unknown", },
639    };
640
641    for (i = 0; i < ARRAY_SIZE(prop_map); i++) {
642        ret = property_get(prop_map[i].src_prop, tmp);
643        if (ret == 0)
644            property_set(prop_map[i].dest_prop, prop_map[i].def_val);
645    }
646
647    ret = property_get("ro.boot.console", tmp);
648    if (ret)
649        strlcpy(console, tmp, sizeof(console));
650
651    /* save a copy for init's usage during boot */
652    property_get("ro.bootmode", tmp);
653    strlcpy(bootmode, tmp, sizeof(bootmode));
654
655    /* if this was given on kernel command line, override what we read
656     * before (e.g. from /proc/cpuinfo), if anything */
657    ret = property_get("ro.boot.hardware", tmp);
658    if (ret)
659        strlcpy(hardware, tmp, sizeof(hardware));
660    property_set("ro.hardware", hardware);
661
662    snprintf(tmp, PROP_VALUE_MAX, "%d", revision);
663    property_set("ro.revision", tmp);
664
665    /* TODO: these are obsolete. We should delete them */
666    if (!strcmp(bootmode,"factory"))
667        property_set("ro.factorytest", "1");
668    else if (!strcmp(bootmode,"factory2"))
669        property_set("ro.factorytest", "2");
670    else
671        property_set("ro.factorytest", "0");
672}
673
674static void process_kernel_cmdline(void)
675{
676    /* don't expose the raw commandline to nonpriv processes */
677    chmod("/proc/cmdline", 0440);
678
679    /* first pass does the common stuff, and finds if we are in qemu.
680     * second pass is only necessary for qemu to export all kernel params
681     * as props.
682     */
683    import_kernel_cmdline(0, import_kernel_nv);
684    if (qemu[0])
685        import_kernel_cmdline(1, import_kernel_nv);
686
687    /* now propogate the info given on command line to internal variables
688     * used by init as well as the current required properties
689     */
690    export_kernel_boot_props();
691}
692
693static int property_service_init_action(int nargs, char **args)
694{
695    /* read any property files on system or data and
696     * fire up the property service.  This must happen
697     * after the ro.foo properties are set above so
698     * that /data/local.prop cannot interfere with them.
699     */
700    start_property_service();
701    return 0;
702}
703
704static int signal_init_action(int nargs, char **args)
705{
706    signal_init();
707    return 0;
708}
709
710static int check_startup_action(int nargs, char **args)
711{
712    /* make sure we actually have all the pieces we need */
713    if ((get_property_set_fd() < 0) ||
714        (get_signal_fd() < 0)) {
715        ERROR("init startup failure\n");
716        exit(1);
717    }
718
719        /* signal that we hit this point */
720    unlink("/dev/.booting");
721
722    return 0;
723}
724
725static int queue_property_triggers_action(int nargs, char **args)
726{
727    queue_all_property_triggers();
728    /* enable property triggers */
729    property_triggers_enabled = 1;
730    return 0;
731}
732
733#if BOOTCHART
734static int bootchart_init_action(int nargs, char **args)
735{
736    bootchart_count = bootchart_init();
737    if (bootchart_count < 0) {
738        ERROR("bootcharting init failure\n");
739    } else if (bootchart_count > 0) {
740        NOTICE("bootcharting started (period=%d ms)\n", bootchart_count*BOOTCHART_POLLING_MS);
741    } else {
742        NOTICE("bootcharting ignored\n");
743    }
744
745    return 0;
746}
747#endif
748
749static const struct selinux_opt seopts_prop[] = {
750        { SELABEL_OPT_PATH, "/data/security/property_contexts" },
751        { SELABEL_OPT_PATH, "/property_contexts" },
752        { 0, NULL }
753};
754
755struct selabel_handle* selinux_android_prop_context_handle(void)
756{
757    int i = 0;
758    struct selabel_handle* sehandle = NULL;
759    while ((sehandle == NULL) && seopts_prop[i].value) {
760        sehandle = selabel_open(SELABEL_CTX_ANDROID_PROP, &seopts_prop[i], 1);
761        i++;
762    }
763
764    if (!sehandle) {
765        ERROR("SELinux:  Could not load property_contexts:  %s\n",
766              strerror(errno));
767        return NULL;
768    }
769    INFO("SELinux: Loaded property contexts from %s\n", seopts_prop[i - 1].value);
770    return sehandle;
771}
772
773void selinux_init_all_handles(void)
774{
775    sehandle = selinux_android_file_context_handle();
776    sehandle_prop = selinux_android_prop_context_handle();
777}
778
779int selinux_reload_policy(void)
780{
781    if (!selinux_enabled) {
782        return -1;
783    }
784
785    INFO("SELinux: Attempting to reload policy files\n");
786
787    if (selinux_android_reload_policy() == -1) {
788        return -1;
789    }
790
791    if (sehandle)
792        selabel_close(sehandle);
793
794    if (sehandle_prop)
795        selabel_close(sehandle_prop);
796
797    selinux_init_all_handles();
798    return 0;
799}
800
801int audit_callback(void *data, security_class_t cls, char *buf, size_t len)
802{
803    snprintf(buf, len, "property=%s", !data ? "NULL" : (char *)data);
804    return 0;
805}
806
807int main(int argc, char **argv)
808{
809    int fd_count = 0;
810    struct pollfd ufds[4];
811    char *tmpdev;
812    char* debuggable;
813    char tmp[32];
814    int property_set_fd_init = 0;
815    int signal_fd_init = 0;
816    int keychord_fd_init = 0;
817    bool is_charger = false;
818
819    if (!strcmp(basename(argv[0]), "ueventd"))
820        return ueventd_main(argc, argv);
821
822    if (!strcmp(basename(argv[0]), "watchdogd"))
823        return watchdogd_main(argc, argv);
824
825    /* clear the umask */
826    umask(0);
827
828        /* Get the basic filesystem setup we need put
829         * together in the initramdisk on / and then we'll
830         * let the rc file figure out the rest.
831         */
832    mkdir("/dev", 0755);
833    mkdir("/proc", 0755);
834    mkdir("/sys", 0755);
835
836    mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755");
837    mkdir("/dev/pts", 0755);
838    mkdir("/dev/socket", 0755);
839    mount("devpts", "/dev/pts", "devpts", 0, NULL);
840    mount("proc", "/proc", "proc", 0, NULL);
841    mount("sysfs", "/sys", "sysfs", 0, NULL);
842
843        /* indicate that booting is in progress to background fw loaders, etc */
844    close(open("/dev/.booting", O_WRONLY | O_CREAT, 0000));
845
846        /* We must have some place other than / to create the
847         * device nodes for kmsg and null, otherwise we won't
848         * be able to remount / read-only later on.
849         * Now that tmpfs is mounted on /dev, we can actually
850         * talk to the outside world.
851         */
852    open_devnull_stdio();
853    klog_init();
854    property_init();
855
856    get_hardware_name(hardware, &revision);
857
858    process_kernel_cmdline();
859
860    union selinux_callback cb;
861    cb.func_log = klog_write;
862    selinux_set_callback(SELINUX_CB_LOG, cb);
863
864    cb.func_audit = audit_callback;
865    selinux_set_callback(SELINUX_CB_AUDIT, cb);
866
867    INFO("loading selinux policy\n");
868    if (selinux_enabled) {
869        if (selinux_android_load_policy() < 0) {
870            selinux_enabled = 0;
871            INFO("SELinux: Disabled due to failed policy load\n");
872        } else {
873            selinux_init_all_handles();
874        }
875    } else {
876        INFO("SELinux:  Disabled by command line option\n");
877    }
878    /* These directories were necessarily created before initial policy load
879     * and therefore need their security context restored to the proper value.
880     * This must happen before /dev is populated by ueventd.
881     */
882    restorecon("/dev");
883    restorecon("/dev/socket");
884
885    is_charger = !strcmp(bootmode, "charger");
886
887    INFO("property init\n");
888    if (!is_charger)
889        property_load_boot_defaults();
890
891    INFO("reading config file\n");
892    init_parse_config_file("/init.rc");
893
894    action_for_each_trigger("early-init", action_add_queue_tail);
895
896    queue_builtin_action(wait_for_coldboot_done_action, "wait_for_coldboot_done");
897    queue_builtin_action(keychord_init_action, "keychord_init");
898    queue_builtin_action(console_init_action, "console_init");
899
900    /* execute all the boot actions to get us started */
901    action_for_each_trigger("init", action_add_queue_tail);
902
903    /* skip mounting filesystems in charger mode */
904    if (!is_charger) {
905        action_for_each_trigger("early-fs", action_add_queue_tail);
906        action_for_each_trigger("fs", action_add_queue_tail);
907        action_for_each_trigger("post-fs", action_add_queue_tail);
908        action_for_each_trigger("post-fs-data", action_add_queue_tail);
909    }
910
911    queue_builtin_action(property_service_init_action, "property_service_init");
912    queue_builtin_action(signal_init_action, "signal_init");
913    queue_builtin_action(check_startup_action, "check_startup");
914
915    if (is_charger) {
916        action_for_each_trigger("charger", action_add_queue_tail);
917    } else {
918        action_for_each_trigger("early-boot", action_add_queue_tail);
919        action_for_each_trigger("boot", action_add_queue_tail);
920    }
921
922        /* run all property triggers based on current state of the properties */
923    queue_builtin_action(queue_property_triggers_action, "queue_property_triggers");
924
925
926#if BOOTCHART
927    queue_builtin_action(bootchart_init_action, "bootchart_init");
928#endif
929
930    for(;;) {
931        int nr, i, timeout = -1;
932
933        execute_one_command();
934        restart_processes();
935
936        if (!property_set_fd_init && get_property_set_fd() > 0) {
937            ufds[fd_count].fd = get_property_set_fd();
938            ufds[fd_count].events = POLLIN;
939            ufds[fd_count].revents = 0;
940            fd_count++;
941            property_set_fd_init = 1;
942        }
943        if (!signal_fd_init && get_signal_fd() > 0) {
944            ufds[fd_count].fd = get_signal_fd();
945            ufds[fd_count].events = POLLIN;
946            ufds[fd_count].revents = 0;
947            fd_count++;
948            signal_fd_init = 1;
949        }
950        if (!keychord_fd_init && get_keychord_fd() > 0) {
951            ufds[fd_count].fd = get_keychord_fd();
952            ufds[fd_count].events = POLLIN;
953            ufds[fd_count].revents = 0;
954            fd_count++;
955            keychord_fd_init = 1;
956        }
957
958        if (process_needs_restart) {
959            timeout = (process_needs_restart - gettime()) * 1000;
960            if (timeout < 0)
961                timeout = 0;
962        }
963
964        if (!action_queue_empty() || cur_action)
965            timeout = 0;
966
967#if BOOTCHART
968        if (bootchart_count > 0) {
969            if (timeout < 0 || timeout > BOOTCHART_POLLING_MS)
970                timeout = BOOTCHART_POLLING_MS;
971            if (bootchart_step() < 0 || --bootchart_count == 0) {
972                bootchart_finish();
973                bootchart_count = 0;
974            }
975        }
976#endif
977
978        nr = poll(ufds, fd_count, timeout);
979        if (nr <= 0)
980            continue;
981
982        for (i = 0; i < fd_count; i++) {
983            if (ufds[i].revents == POLLIN) {
984                if (ufds[i].fd == get_property_set_fd())
985                    handle_property_set_fd();
986                else if (ufds[i].fd == get_keychord_fd())
987                    handle_keychord();
988                else if (ufds[i].fd == get_signal_fd())
989                    handle_signal();
990            }
991        }
992    }
993
994    return 0;
995}
996