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      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 #include <sys/personality.h>
     35 
     36 #ifdef HAVE_SELINUX
     37 #include <selinux/selinux.h>
     38 #include <selinux/label.h>
     39 #include <selinux/android.h>
     40 #endif
     41 
     42 #include <libgen.h>
     43 
     44 #include <cutils/list.h>
     45 #include <cutils/sockets.h>
     46 #include <cutils/iosched_policy.h>
     47 #include <private/android_filesystem_config.h>
     48 #include <termios.h>
     49 
     50 #include <sys/system_properties.h>
     51 
     52 #include "devices.h"
     53 #include "init.h"
     54 #include "log.h"
     55 #include "property_service.h"
     56 #include "bootchart.h"
     57 #include "signal_handler.h"
     58 #include "keychords.h"
     59 #include "init_parser.h"
     60 #include "util.h"
     61 #include "ueventd.h"
     62 #include "watchdogd.h"
     63 
     64 #ifdef HAVE_SELINUX
     65 struct selabel_handle *sehandle;
     66 struct selabel_handle *sehandle_prop;
     67 #endif
     68 
     69 static int property_triggers_enabled = 0;
     70 
     71 #if BOOTCHART
     72 static int   bootchart_count;
     73 #endif
     74 
     75 static char console[32];
     76 static char bootmode[32];
     77 static char hardware[32];
     78 static unsigned revision = 0;
     79 static char qemu[32];
     80 
     81 #ifdef HAVE_SELINUX
     82 static int selinux_enabled = 1;
     83 #endif
     84 
     85 static struct action *cur_action = NULL;
     86 static struct command *cur_command = NULL;
     87 static struct listnode *command_queue = NULL;
     88 
     89 void notify_service_state(const char *name, const char *state)
     90 {
     91     char pname[PROP_NAME_MAX];
     92     int len = strlen(name);
     93     if ((len + 10) > PROP_NAME_MAX)
     94         return;
     95     snprintf(pname, sizeof(pname), "init.svc.%s", name);
     96     property_set(pname, state);
     97 }
     98 
     99 static int have_console;
    100 static char *console_name = "/dev/console";
    101 static time_t process_needs_restart;
    102 
    103 static const char *ENV[32];
    104 
    105 /* add_environment - add "key=value" to the current environment */
    106 int add_environment(const char *key, const char *val)
    107 {
    108     int n;
    109 
    110     for (n = 0; n < 31; n++) {
    111         if (!ENV[n]) {
    112             size_t len = strlen(key) + strlen(val) + 2;
    113             char *entry = malloc(len);
    114             snprintf(entry, len, "%s=%s", key, val);
    115             ENV[n] = entry;
    116             return 0;
    117         }
    118     }
    119 
    120     return 1;
    121 }
    122 
    123 static void zap_stdio(void)
    124 {
    125     int fd;
    126     fd = open("/dev/null", O_RDWR);
    127     dup2(fd, 0);
    128     dup2(fd, 1);
    129     dup2(fd, 2);
    130     close(fd);
    131 }
    132 
    133 static void open_console()
    134 {
    135     int fd;
    136     if ((fd = open(console_name, O_RDWR)) < 0) {
    137         fd = open("/dev/null", O_RDWR);
    138     }
    139     ioctl(fd, TIOCSCTTY, 0);
    140     dup2(fd, 0);
    141     dup2(fd, 1);
    142     dup2(fd, 2);
    143     close(fd);
    144 }
    145 
    146 static void publish_socket(const char *name, int fd)
    147 {
    148     char key[64] = ANDROID_SOCKET_ENV_PREFIX;
    149     char val[64];
    150 
    151     strlcpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1,
    152             name,
    153             sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX));
    154     snprintf(val, sizeof(val), "%d", fd);
    155     add_environment(key, val);
    156 
    157     /* make sure we don't close-on-exec */
    158     fcntl(fd, F_SETFD, 0);
    159 }
    160 
    161 void service_start(struct service *svc, const char *dynamic_args)
    162 {
    163     struct stat s;
    164     pid_t pid;
    165     int needs_console;
    166     int n;
    167 #ifdef HAVE_SELINUX
    168     char *scon = NULL;
    169     int rc;
    170 #endif
    171         /* starting a service removes it from the disabled or reset
    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|SVC_RESET));
    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     if ((!(svc->flags & SVC_ONESHOT)) && dynamic_args) {
    201         ERROR("service '%s' must be one-shot to use dynamic args, disabling\n",
    202                svc->args[0]);
    203         svc->flags |= SVC_DISABLED;
    204         return;
    205     }
    206 
    207 #ifdef HAVE_SELINUX
    208     if (is_selinux_enabled() > 0) {
    209         char *mycon = NULL, *fcon = NULL;
    210 
    211         INFO("computing context for service '%s'\n", svc->args[0]);
    212         rc = getcon(&mycon);
    213         if (rc < 0) {
    214             ERROR("could not get context while starting '%s'\n", svc->name);
    215             return;
    216         }
    217 
    218         rc = getfilecon(svc->args[0], &fcon);
    219         if (rc < 0) {
    220             ERROR("could not get context while starting '%s'\n", svc->name);
    221             freecon(mycon);
    222             return;
    223         }
    224 
    225         rc = security_compute_create(mycon, fcon, string_to_security_class("process"), &scon);
    226         freecon(mycon);
    227         freecon(fcon);
    228         if (rc < 0) {
    229             ERROR("could not get context while starting '%s'\n", svc->name);
    230             return;
    231         }
    232     }
    233 #endif
    234 
    235     NOTICE("starting '%s'\n", svc->name);
    236 
    237     pid = fork();
    238 
    239     if (pid == 0) {
    240         struct socketinfo *si;
    241         struct svcenvinfo *ei;
    242         char tmp[32];
    243         int fd, sz;
    244 
    245         umask(077);
    246 #ifdef __arm__
    247         /*
    248          * b/7188322 - Temporarily revert to the compat memory layout
    249          * to avoid breaking third party apps.
    250          *
    251          * THIS WILL GO AWAY IN A FUTURE ANDROID RELEASE.
    252          *
    253          * http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=7dbaa466
    254          * changes the kernel mapping from bottom up to top-down.
    255          * This breaks some programs which improperly embed
    256          * an out of date copy of Android's linker.
    257          */
    258         int current = personality(0xffffFFFF);
    259         personality(current | ADDR_COMPAT_LAYOUT);
    260 #endif
    261         if (properties_inited()) {
    262             get_property_workspace(&fd, &sz);
    263             sprintf(tmp, "%d,%d", dup(fd), sz);
    264             add_environment("ANDROID_PROPERTY_WORKSPACE", tmp);
    265         }
    266 
    267         for (ei = svc->envvars; ei; ei = ei->next)
    268             add_environment(ei->name, ei->value);
    269 
    270 #ifdef HAVE_SELINUX
    271         setsockcreatecon(scon);
    272 #endif
    273 
    274         for (si = svc->sockets; si; si = si->next) {
    275             int socket_type = (
    276                     !strcmp(si->type, "stream") ? SOCK_STREAM :
    277                         (!strcmp(si->type, "dgram") ? SOCK_DGRAM : SOCK_SEQPACKET));
    278             int s = create_socket(si->name, socket_type,
    279                                   si->perm, si->uid, si->gid);
    280             if (s >= 0) {
    281                 publish_socket(si->name, s);
    282             }
    283         }
    284 
    285 #ifdef HAVE_SELINUX
    286         freecon(scon);
    287         scon = NULL;
    288         setsockcreatecon(NULL);
    289 #endif
    290 
    291         if (svc->ioprio_class != IoSchedClass_NONE) {
    292             if (android_set_ioprio(getpid(), svc->ioprio_class, svc->ioprio_pri)) {
    293                 ERROR("Failed to set pid %d ioprio = %d,%d: %s\n",
    294                       getpid(), svc->ioprio_class, svc->ioprio_pri, strerror(errno));
    295             }
    296         }
    297 
    298         if (needs_console) {
    299             setsid();
    300             open_console();
    301         } else {
    302             zap_stdio();
    303         }
    304 
    305 #if 0
    306         for (n = 0; svc->args[n]; n++) {
    307             INFO("args[%d] = '%s'\n", n, svc->args[n]);
    308         }
    309         for (n = 0; ENV[n]; n++) {
    310             INFO("env[%d] = '%s'\n", n, ENV[n]);
    311         }
    312 #endif
    313 
    314         setpgid(0, getpid());
    315 
    316     /* as requested, set our gid, supplemental gids, and uid */
    317         if (svc->gid) {
    318             if (setgid(svc->gid) != 0) {
    319                 ERROR("setgid failed: %s\n", strerror(errno));
    320                 _exit(127);
    321             }
    322         }
    323         if (svc->nr_supp_gids) {
    324             if (setgroups(svc->nr_supp_gids, svc->supp_gids) != 0) {
    325                 ERROR("setgroups failed: %s\n", strerror(errno));
    326                 _exit(127);
    327             }
    328         }
    329         if (svc->uid) {
    330             if (setuid(svc->uid) != 0) {
    331                 ERROR("setuid failed: %s\n", strerror(errno));
    332                 _exit(127);
    333             }
    334         }
    335 
    336 #ifdef HAVE_SELINUX
    337         if (svc->seclabel) {
    338             if (is_selinux_enabled() > 0 && setexeccon(svc->seclabel) < 0) {
    339                 ERROR("cannot setexeccon('%s'): %s\n", svc->seclabel, strerror(errno));
    340                 _exit(127);
    341             }
    342         }
    343 #endif
    344 
    345         if (!dynamic_args) {
    346             if (execve(svc->args[0], (char**) svc->args, (char**) ENV) < 0) {
    347                 ERROR("cannot execve('%s'): %s\n", svc->args[0], strerror(errno));
    348             }
    349         } else {
    350             char *arg_ptrs[INIT_PARSER_MAXARGS+1];
    351             int arg_idx = svc->nargs;
    352             char *tmp = strdup(dynamic_args);
    353             char *next = tmp;
    354             char *bword;
    355 
    356             /* Copy the static arguments */
    357             memcpy(arg_ptrs, svc->args, (svc->nargs * sizeof(char *)));
    358 
    359             while((bword = strsep(&next, " "))) {
    360                 arg_ptrs[arg_idx++] = bword;
    361                 if (arg_idx == INIT_PARSER_MAXARGS)
    362                     break;
    363             }
    364             arg_ptrs[arg_idx] = '\0';
    365             execve(svc->args[0], (char**) arg_ptrs, (char**) ENV);
    366         }
    367         _exit(127);
    368     }
    369 
    370 #ifdef HAVE_SELINUX
    371     freecon(scon);
    372 #endif
    373 
    374     if (pid < 0) {
    375         ERROR("failed to start '%s'\n", svc->name);
    376         svc->pid = 0;
    377         return;
    378     }
    379 
    380     svc->time_started = gettime();
    381     svc->pid = pid;
    382     svc->flags |= SVC_RUNNING;
    383 
    384     if (properties_inited())
    385         notify_service_state(svc->name, "running");
    386 }
    387 
    388 /* The how field should be either SVC_DISABLED or SVC_RESET */
    389 static void service_stop_or_reset(struct service *svc, int how)
    390 {
    391         /* we are no longer running, nor should we
    392          * attempt to restart
    393          */
    394     svc->flags &= (~(SVC_RUNNING|SVC_RESTARTING));
    395 
    396     if ((how != SVC_DISABLED) && (how != SVC_RESET)) {
    397         /* Hrm, an illegal flag.  Default to SVC_DISABLED */
    398         how = SVC_DISABLED;
    399     }
    400         /* if the service has not yet started, prevent
    401          * it from auto-starting with its class
    402          */
    403     if (how == SVC_RESET) {
    404         svc->flags |= (svc->flags & SVC_RC_DISABLED) ? SVC_DISABLED : SVC_RESET;
    405     } else {
    406         svc->flags |= how;
    407     }
    408 
    409     if (svc->pid) {
    410         NOTICE("service '%s' is being killed\n", svc->name);
    411         kill(-svc->pid, SIGKILL);
    412         notify_service_state(svc->name, "stopping");
    413     } else {
    414         notify_service_state(svc->name, "stopped");
    415     }
    416 }
    417 
    418 void service_reset(struct service *svc)
    419 {
    420     service_stop_or_reset(svc, SVC_RESET);
    421 }
    422 
    423 void service_stop(struct service *svc)
    424 {
    425     service_stop_or_reset(svc, SVC_DISABLED);
    426 }
    427 
    428 void property_changed(const char *name, const char *value)
    429 {
    430     if (property_triggers_enabled)
    431         queue_property_triggers(name, value);
    432 }
    433 
    434 static void restart_service_if_needed(struct service *svc)
    435 {
    436     time_t next_start_time = svc->time_started + 5;
    437 
    438     if (next_start_time <= gettime()) {
    439         svc->flags &= (~SVC_RESTARTING);
    440         service_start(svc, NULL);
    441         return;
    442     }
    443 
    444     if ((next_start_time < process_needs_restart) ||
    445         (process_needs_restart == 0)) {
    446         process_needs_restart = next_start_time;
    447     }
    448 }
    449 
    450 static void restart_processes()
    451 {
    452     process_needs_restart = 0;
    453     service_for_each_flags(SVC_RESTARTING,
    454                            restart_service_if_needed);
    455 }
    456 
    457 static void msg_start(const char *name)
    458 {
    459     struct service *svc;
    460     char *tmp = NULL;
    461     char *args = NULL;
    462 
    463     if (!strchr(name, ':'))
    464         svc = service_find_by_name(name);
    465     else {
    466         tmp = strdup(name);
    467         args = strchr(tmp, ':');
    468         *args = '\0';
    469         args++;
    470 
    471         svc = service_find_by_name(tmp);
    472     }
    473 
    474     if (svc) {
    475         service_start(svc, args);
    476     } else {
    477         ERROR("no such service '%s'\n", name);
    478     }
    479     if (tmp)
    480         free(tmp);
    481 }
    482 
    483 static void msg_stop(const char *name)
    484 {
    485     struct service *svc = service_find_by_name(name);
    486 
    487     if (svc) {
    488         service_stop(svc);
    489     } else {
    490         ERROR("no such service '%s'\n", name);
    491     }
    492 }
    493 
    494 void handle_control_message(const char *msg, const char *arg)
    495 {
    496     if (!strcmp(msg,"start")) {
    497         msg_start(arg);
    498     } else if (!strcmp(msg,"stop")) {
    499         msg_stop(arg);
    500     } else if (!strcmp(msg,"restart")) {
    501         msg_stop(arg);
    502         msg_start(arg);
    503     } else {
    504         ERROR("unknown control msg '%s'\n", msg);
    505     }
    506 }
    507 
    508 static struct command *get_first_command(struct action *act)
    509 {
    510     struct listnode *node;
    511     node = list_head(&act->commands);
    512     if (!node || list_empty(&act->commands))
    513         return NULL;
    514 
    515     return node_to_item(node, struct command, clist);
    516 }
    517 
    518 static struct command *get_next_command(struct action *act, struct command *cmd)
    519 {
    520     struct listnode *node;
    521     node = cmd->clist.next;
    522     if (!node)
    523         return NULL;
    524     if (node == &act->commands)
    525         return NULL;
    526 
    527     return node_to_item(node, struct command, clist);
    528 }
    529 
    530 static int is_last_command(struct action *act, struct command *cmd)
    531 {
    532     return (list_tail(&act->commands) == &cmd->clist);
    533 }
    534 
    535 void execute_one_command(void)
    536 {
    537     int ret;
    538 
    539     if (!cur_action || !cur_command || is_last_command(cur_action, cur_command)) {
    540         cur_action = action_remove_queue_head();
    541         cur_command = NULL;
    542         if (!cur_action)
    543             return;
    544         INFO("processing action %p (%s)\n", cur_action, cur_action->name);
    545         cur_command = get_first_command(cur_action);
    546     } else {
    547         cur_command = get_next_command(cur_action, cur_command);
    548     }
    549 
    550     if (!cur_command)
    551         return;
    552 
    553     ret = cur_command->func(cur_command->nargs, cur_command->args);
    554     INFO("command '%s' r=%d\n", cur_command->args[0], ret);
    555 }
    556 
    557 static int wait_for_coldboot_done_action(int nargs, char **args)
    558 {
    559     int ret;
    560     INFO("wait for %s\n", coldboot_done);
    561     ret = wait_for_file(coldboot_done, COMMAND_RETRY_TIMEOUT);
    562     if (ret)
    563         ERROR("Timed out waiting for %s\n", coldboot_done);
    564     return ret;
    565 }
    566 
    567 static int keychord_init_action(int nargs, char **args)
    568 {
    569     keychord_init();
    570     return 0;
    571 }
    572 
    573 static int console_init_action(int nargs, char **args)
    574 {
    575     int fd;
    576     char tmp[PROP_VALUE_MAX];
    577 
    578     if (console[0]) {
    579         snprintf(tmp, sizeof(tmp), "/dev/%s", console);
    580         console_name = strdup(tmp);
    581     }
    582 
    583     fd = open(console_name, O_RDWR);
    584     if (fd >= 0)
    585         have_console = 1;
    586     close(fd);
    587 
    588     if( load_565rle_image(INIT_IMAGE_FILE) ) {
    589         fd = open("/dev/tty0", O_WRONLY);
    590         if (fd >= 0) {
    591             const char *msg;
    592                 msg = "\n"
    593             "\n"
    594             "\n"
    595             "\n"
    596             "\n"
    597             "\n"
    598             "\n"  // console is 40 cols x 30 lines
    599             "\n"
    600             "\n"
    601             "\n"
    602             "\n"
    603             "\n"
    604             "\n"
    605             "\n"
    606             "             A N D R O I D ";
    607             write(fd, msg, strlen(msg));
    608             close(fd);
    609         }
    610     }
    611     return 0;
    612 }
    613 
    614 static void import_kernel_nv(char *name, int for_emulator)
    615 {
    616     char *value = strchr(name, '=');
    617     int name_len = strlen(name);
    618 
    619     if (value == 0) return;
    620     *value++ = 0;
    621     if (name_len == 0) return;
    622 
    623 #ifdef HAVE_SELINUX
    624     if (!strcmp(name,"selinux")) {
    625         selinux_enabled = atoi(value);
    626     }
    627 #endif
    628 
    629     if (for_emulator) {
    630         /* in the emulator, export any kernel option with the
    631          * ro.kernel. prefix */
    632         char buff[PROP_NAME_MAX];
    633         int len = snprintf( buff, sizeof(buff), "ro.kernel.%s", name );
    634 
    635         if (len < (int)sizeof(buff))
    636             property_set( buff, value );
    637         return;
    638     }
    639 
    640     if (!strcmp(name,"qemu")) {
    641         strlcpy(qemu, value, sizeof(qemu));
    642     } else if (!strncmp(name, "androidboot.", 12) && name_len > 12) {
    643         const char *boot_prop_name = name + 12;
    644         char prop[PROP_NAME_MAX];
    645         int cnt;
    646 
    647         cnt = snprintf(prop, sizeof(prop), "ro.boot.%s", boot_prop_name);
    648         if (cnt < PROP_NAME_MAX)
    649             property_set(prop, value);
    650     }
    651 }
    652 
    653 static void export_kernel_boot_props(void)
    654 {
    655     char tmp[PROP_VALUE_MAX];
    656     const char *pval;
    657     unsigned i;
    658     struct {
    659         const char *src_prop;
    660         const char *dest_prop;
    661         const char *def_val;
    662     } prop_map[] = {
    663         { "ro.boot.serialno", "ro.serialno", "", },
    664         { "ro.boot.mode", "ro.bootmode", "unknown", },
    665         { "ro.boot.baseband", "ro.baseband", "unknown", },
    666         { "ro.boot.bootloader", "ro.bootloader", "unknown", },
    667     };
    668 
    669     for (i = 0; i < ARRAY_SIZE(prop_map); i++) {
    670         pval = property_get(prop_map[i].src_prop);
    671         property_set(prop_map[i].dest_prop, pval ?: prop_map[i].def_val);
    672     }
    673 
    674     pval = property_get("ro.boot.console");
    675     if (pval)
    676         strlcpy(console, pval, sizeof(console));
    677 
    678     /* save a copy for init's usage during boot */
    679     strlcpy(bootmode, property_get("ro.bootmode"), sizeof(bootmode));
    680 
    681     /* if this was given on kernel command line, override what we read
    682      * before (e.g. from /proc/cpuinfo), if anything */
    683     pval = property_get("ro.boot.hardware");
    684     if (pval)
    685         strlcpy(hardware, pval, sizeof(hardware));
    686     property_set("ro.hardware", hardware);
    687 
    688     snprintf(tmp, PROP_VALUE_MAX, "%d", revision);
    689     property_set("ro.revision", tmp);
    690 
    691     /* TODO: these are obsolete. We should delete them */
    692     if (!strcmp(bootmode,"factory"))
    693         property_set("ro.factorytest", "1");
    694     else if (!strcmp(bootmode,"factory2"))
    695         property_set("ro.factorytest", "2");
    696     else
    697         property_set("ro.factorytest", "0");
    698 }
    699 
    700 static void process_kernel_cmdline(void)
    701 {
    702     /* don't expose the raw commandline to nonpriv processes */
    703     chmod("/proc/cmdline", 0440);
    704 
    705     /* first pass does the common stuff, and finds if we are in qemu.
    706      * second pass is only necessary for qemu to export all kernel params
    707      * as props.
    708      */
    709     import_kernel_cmdline(0, import_kernel_nv);
    710     if (qemu[0])
    711         import_kernel_cmdline(1, import_kernel_nv);
    712 
    713     /* now propogate the info given on command line to internal variables
    714      * used by init as well as the current required properties
    715      */
    716     export_kernel_boot_props();
    717 }
    718 
    719 static int property_service_init_action(int nargs, char **args)
    720 {
    721     /* read any property files on system or data and
    722      * fire up the property service.  This must happen
    723      * after the ro.foo properties are set above so
    724      * that /data/local.prop cannot interfere with them.
    725      */
    726     start_property_service();
    727     return 0;
    728 }
    729 
    730 static int signal_init_action(int nargs, char **args)
    731 {
    732     signal_init();
    733     return 0;
    734 }
    735 
    736 static int check_startup_action(int nargs, char **args)
    737 {
    738     /* make sure we actually have all the pieces we need */
    739     if ((get_property_set_fd() < 0) ||
    740         (get_signal_fd() < 0)) {
    741         ERROR("init startup failure\n");
    742         exit(1);
    743     }
    744 
    745         /* signal that we hit this point */
    746     unlink("/dev/.booting");
    747 
    748     return 0;
    749 }
    750 
    751 static int queue_property_triggers_action(int nargs, char **args)
    752 {
    753     queue_all_property_triggers();
    754     /* enable property triggers */
    755     property_triggers_enabled = 1;
    756     return 0;
    757 }
    758 
    759 #if BOOTCHART
    760 static int bootchart_init_action(int nargs, char **args)
    761 {
    762     bootchart_count = bootchart_init();
    763     if (bootchart_count < 0) {
    764         ERROR("bootcharting init failure\n");
    765     } else if (bootchart_count > 0) {
    766         NOTICE("bootcharting started (period=%d ms)\n", bootchart_count*BOOTCHART_POLLING_MS);
    767     } else {
    768         NOTICE("bootcharting ignored\n");
    769     }
    770 
    771     return 0;
    772 }
    773 #endif
    774 
    775 #ifdef HAVE_SELINUX
    776 static const struct selinux_opt seopts_prop[] = {
    777         { SELABEL_OPT_PATH, "/data/system/property_contexts" },
    778         { SELABEL_OPT_PATH, "/property_contexts" },
    779         { 0, NULL }
    780 };
    781 
    782 struct selabel_handle* selinux_android_prop_context_handle(void)
    783 {
    784     int i = 0;
    785     struct selabel_handle* sehandle = NULL;
    786     while ((sehandle == NULL) && seopts_prop[i].value) {
    787         sehandle = selabel_open(SELABEL_CTX_ANDROID_PROP, &seopts_prop[i], 1);
    788         i++;
    789     }
    790 
    791     if (!sehandle) {
    792         ERROR("SELinux:  Could not load property_contexts:  %s\n",
    793               strerror(errno));
    794         return NULL;
    795     }
    796     INFO("SELinux: Loaded property contexts from %s\n", seopts_prop[i - 1].value);
    797     return sehandle;
    798 }
    799 
    800 void selinux_init_all_handles(void)
    801 {
    802     sehandle = selinux_android_file_context_handle();
    803     sehandle_prop = selinux_android_prop_context_handle();
    804 }
    805 
    806 int selinux_reload_policy(void)
    807 {
    808     if (!selinux_enabled) {
    809         return -1;
    810     }
    811 
    812     INFO("SELinux: Attempting to reload policy files\n");
    813 
    814     if (selinux_android_reload_policy() == -1) {
    815         return -1;
    816     }
    817 
    818     if (sehandle)
    819         selabel_close(sehandle);
    820 
    821     if (sehandle_prop)
    822         selabel_close(sehandle_prop);
    823 
    824     selinux_init_all_handles();
    825     return 0;
    826 }
    827 
    828 int audit_callback(void *data, security_class_t cls, char *buf, size_t len)
    829 {
    830     snprintf(buf, len, "property=%s", !data ? "NULL" : (char *)data);
    831     return 0;
    832 }
    833 
    834 #endif
    835 
    836 int main(int argc, char **argv)
    837 {
    838     int fd_count = 0;
    839     struct pollfd ufds[4];
    840     char *tmpdev;
    841     char* debuggable;
    842     char tmp[32];
    843     int property_set_fd_init = 0;
    844     int signal_fd_init = 0;
    845     int keychord_fd_init = 0;
    846     bool is_charger = false;
    847 
    848     if (!strcmp(basename(argv[0]), "ueventd"))
    849         return ueventd_main(argc, argv);
    850 
    851     if (!strcmp(basename(argv[0]), "watchdogd"))
    852         return watchdogd_main(argc, argv);
    853 
    854     /* clear the umask */
    855     umask(0);
    856 
    857         /* Get the basic filesystem setup we need put
    858          * together in the initramdisk on / and then we'll
    859          * let the rc file figure out the rest.
    860          */
    861     mkdir("/dev", 0755);
    862     mkdir("/proc", 0755);
    863     mkdir("/sys", 0755);
    864 
    865     mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755");
    866     mkdir("/dev/pts", 0755);
    867     mkdir("/dev/socket", 0755);
    868     mount("devpts", "/dev/pts", "devpts", 0, NULL);
    869     mount("proc", "/proc", "proc", 0, NULL);
    870     mount("sysfs", "/sys", "sysfs", 0, NULL);
    871 
    872         /* indicate that booting is in progress to background fw loaders, etc */
    873     close(open("/dev/.booting", O_WRONLY | O_CREAT, 0000));
    874 
    875         /* We must have some place other than / to create the
    876          * device nodes for kmsg and null, otherwise we won't
    877          * be able to remount / read-only later on.
    878          * Now that tmpfs is mounted on /dev, we can actually
    879          * talk to the outside world.
    880          */
    881     open_devnull_stdio();
    882     klog_init();
    883     property_init();
    884 
    885     get_hardware_name(hardware, &revision);
    886 
    887     process_kernel_cmdline();
    888 
    889 #ifdef HAVE_SELINUX
    890     union selinux_callback cb;
    891     cb.func_log = klog_write;
    892     selinux_set_callback(SELINUX_CB_LOG, cb);
    893 
    894     cb.func_audit = audit_callback;
    895     selinux_set_callback(SELINUX_CB_AUDIT, cb);
    896 
    897     INFO("loading selinux policy\n");
    898     if (selinux_enabled) {
    899         if (selinux_android_load_policy() < 0) {
    900             selinux_enabled = 0;
    901             INFO("SELinux: Disabled due to failed policy load\n");
    902         } else {
    903             selinux_init_all_handles();
    904         }
    905     } else {
    906         INFO("SELinux:  Disabled by command line option\n");
    907     }
    908     /* These directories were necessarily created before initial policy load
    909      * and therefore need their security context restored to the proper value.
    910      * This must happen before /dev is populated by ueventd.
    911      */
    912     restorecon("/dev");
    913     restorecon("/dev/socket");
    914 #endif
    915 
    916     is_charger = !strcmp(bootmode, "charger");
    917 
    918     INFO("property init\n");
    919     if (!is_charger)
    920         property_load_boot_defaults();
    921 
    922     INFO("reading config file\n");
    923     init_parse_config_file("/init.rc");
    924 
    925     action_for_each_trigger("early-init", action_add_queue_tail);
    926 
    927     queue_builtin_action(wait_for_coldboot_done_action, "wait_for_coldboot_done");
    928     queue_builtin_action(keychord_init_action, "keychord_init");
    929     queue_builtin_action(console_init_action, "console_init");
    930 
    931     /* execute all the boot actions to get us started */
    932     action_for_each_trigger("init", action_add_queue_tail);
    933 
    934     /* skip mounting filesystems in charger mode */
    935     if (!is_charger) {
    936         action_for_each_trigger("early-fs", action_add_queue_tail);
    937         action_for_each_trigger("fs", action_add_queue_tail);
    938         action_for_each_trigger("post-fs", action_add_queue_tail);
    939         action_for_each_trigger("post-fs-data", action_add_queue_tail);
    940     }
    941 
    942     queue_builtin_action(property_service_init_action, "property_service_init");
    943     queue_builtin_action(signal_init_action, "signal_init");
    944     queue_builtin_action(check_startup_action, "check_startup");
    945 
    946     if (is_charger) {
    947         action_for_each_trigger("charger", action_add_queue_tail);
    948     } else {
    949         action_for_each_trigger("early-boot", action_add_queue_tail);
    950         action_for_each_trigger("boot", action_add_queue_tail);
    951     }
    952 
    953         /* run all property triggers based on current state of the properties */
    954     queue_builtin_action(queue_property_triggers_action, "queue_property_triggers");
    955 
    956 
    957 #if BOOTCHART
    958     queue_builtin_action(bootchart_init_action, "bootchart_init");
    959 #endif
    960 
    961     for(;;) {
    962         int nr, i, timeout = -1;
    963 
    964         execute_one_command();
    965         restart_processes();
    966 
    967         if (!property_set_fd_init && get_property_set_fd() > 0) {
    968             ufds[fd_count].fd = get_property_set_fd();
    969             ufds[fd_count].events = POLLIN;
    970             ufds[fd_count].revents = 0;
    971             fd_count++;
    972             property_set_fd_init = 1;
    973         }
    974         if (!signal_fd_init && get_signal_fd() > 0) {
    975             ufds[fd_count].fd = get_signal_fd();
    976             ufds[fd_count].events = POLLIN;
    977             ufds[fd_count].revents = 0;
    978             fd_count++;
    979             signal_fd_init = 1;
    980         }
    981         if (!keychord_fd_init && get_keychord_fd() > 0) {
    982             ufds[fd_count].fd = get_keychord_fd();
    983             ufds[fd_count].events = POLLIN;
    984             ufds[fd_count].revents = 0;
    985             fd_count++;
    986             keychord_fd_init = 1;
    987         }
    988 
    989         if (process_needs_restart) {
    990             timeout = (process_needs_restart - gettime()) * 1000;
    991             if (timeout < 0)
    992                 timeout = 0;
    993         }
    994 
    995         if (!action_queue_empty() || cur_action)
    996             timeout = 0;
    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 
   1009         nr = poll(ufds, fd_count, timeout);
   1010         if (nr <= 0)
   1011             continue;
   1012 
   1013         for (i = 0; i < fd_count; i++) {
   1014             if (ufds[i].revents == POLLIN) {
   1015                 if (ufds[i].fd == get_property_set_fd())
   1016                     handle_property_set_fd();
   1017                 else if (ufds[i].fd == get_keychord_fd())
   1018                     handle_keychord();
   1019                 else if (ufds[i].fd == get_signal_fd())
   1020                     handle_signal();
   1021             }
   1022         }
   1023     }
   1024 
   1025     return 0;
   1026 }
   1027