当我们只是按下电源键开机时,会进入正常启动模式。 Secondary stage bootloader 会从boot 分区开始启动。Boot 分区的格式是固定的,首先是一个头部,然后是 Linux 内核,最后是用作根文件系统的 ramdisk。
当 Linux 内核启动完毕后,就开始执行根文件系统中的 init 程序,init 程序会读取启动脚本文件(init.rc 和init.goldfish)。

现在就来说一下，init.rc到底在做些什么，我会在附件上传有关init_rc脚本语法和自己阅读是坐下到笔记，希望对各位有所帮助。
  1. on boot-pause
  2.     exec sbin/chargerlogo #运行sbin/chargerlogo（此运行在内核目录下）

  4. on early-init
  5.     start ueventd #调用sbin/uventd链接所指的可执行程序，其源码位于system/core/init/ueventd.c，为设备赋予权限

  7. on init #源码位于system/core/init/init.c
  8. #主要完成一下的工作
  9. #清空umask、创建并挂载一些基本的目录（/dev-设备、/proc-系统信息、/sys-系统信息、/dev/pts-终端控制字，用于执行adb、/dev/socket）

  11. sysclktz 0 #把硬件时钟当成本地时间（GMT时区）

  13. loglevel 3 #讲系统LOG设置成可见，0为（NONE）

  15.     write /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor "performance"

  17. # setup the global environment 设置全局变量
  18.     export PATH /sbin:/vendor/bin:/system/sbin:/system/bin:/system/xbin #PATH变量
  19.     export LD_LIBRARY_PATH /vendor/lib:/system/lib #库
  20.     export ANDROID_BOOTLOGO 1
  21.     export ANDROID_CACHE /cache #cache目录
  22.     export ANDROID_ROOT /system #安卓系统root分区-->/system
  23.     export ANDROID_ASSETS /system/app #安卓系统可访问到-->/system/app（这就是为什么没有root权限不能删除/system/app下到文件）
  24.     export ANDROID_DATA /data #安卓data区
  25.     export DOWNLOAD_CACHE /cache/download #下载缓存为/cache/download
  26.     export EXTERNAL_STORAGE /mnt/sdcard #附加存储-->sdcard卡
  27.     export ASEC_MOUNTPOINT /mnt/asec #asec根文件目录
  28.     export LOOP_MOUNTPOINT /mnt/obb
  29.     export SD_EXT_DIRECTORY /sd-ext #sdcard挂载格式
  30.     export BOOTCLASSPATH /system/framework/core.jar:/system/framework/bouncycastle.jar:/system/framework/ext.jar:/system/framework/framework.jar:/system/framework/android.policy.jar:/system/framework/services.jar:/system/framework/core-junit.jar #bootclasspath
  31.     export DSP_PATH /system/lib/dsp #dsp(数字信号处理器) path
  32.     export DEFAULT_BASEIMAGE /system/lib/dsp/baseimage.dof
  33.     export QOSDYN_FILE /system/lib/dsp/qosdyn_3430.dll64P

  35. # Backward compatibility #反向兼容，确保对以前版本到兼容？（不缺定）
  36.     symlink /system/etc /etc #在/etc下创建链接到/system/etc到链接
  37.     symlink /sys/kernel/debug /d

  39. # Right now vendor lives on the same filesystem as system,
  40. # but someday that may change.
  41.     symlink /system/vendor /vendor

  43. # create mountpoints
  44.     mkdir /mnt 0775 root system
  45.     #给system赋予0775的权限，也就是rwx-rwx-rw-现在详细解释如下
  46.     #此权限数值对应为：
  47.     #u(用户):r(读)-w(写)-x(执行)
  48.     #g(群组):r(读)-w(写)-x(执行)
  49.     #0(其他):r(读)-w(写)-
  50.     #对应到2进制数值为：
  51.     #1  1 1  ：111 ---7
  52.     #1  1 1  ：111 ---7
  53.     #1  1 0  ：110 ---5
  54.     #
  55.     mkdir /mnt/sdcard 0000 system system

  57. # Create cgroup mount point for cpu accounting #为cpu创建
  58.     mkdir /acct
  59.     mount cgroup none /acct cpuacct
  60.     mkdir /acct/uid

  62. # Backwards Compat - XXX: Going away in G*
  63.     symlink /mnt/sdcard /sdcard

  65.     mkdir /system
  66.     mkdir /data 0771 system system
  67.     mkdir /cache 0771 system cache
  68.     mkdir /config 0500 root root

  70.     mkdir /sqlite_stmt_journals 01777 root root
  71.     mount tmpfs tmpfs /sqlite_stmt_journals size=4m

  73.     # Directory for putting things only root should see.#创建用于存放root用户才能可见到文件夹
  74.     mkdir /mnt/secure 0700 root root

  76.     # Directory for staging bindmounts #伺服器根文件目录
  77.     mkdir /mnt/secure/staging 0700 root root

  79.     # Directory-target for where the secure container
  80.     # imagefile directory will be bind-mounted
  81.     mkdir /mnt/secure/asec  0700 root root

  83.     # Secure container public mount points.
  84.     mkdir /mnt/asec  0700 root system
  85.     mount tmpfs tmpfs /mnt/asec mode=0755,gid=1000

  87.     # Filesystem image public mount points.
  88.     mkdir /mnt/obb 0700 root system
  89.     mount tmpfs tmpfs /mnt/obb mode=0755,gid=1000

  91.     mkdir /sd-ext 0771 system system

  93.     write /proc/sys/kernel/panic_on_oops 1
  94.     write /proc/sys/kernel/hung_task_timeout_secs 0
  95.     write /proc/cpu/alignment 4
  96.     write /proc/sys/kernel/sched_latency_ns 10000000
  97.     write /proc/sys/kernel/sched_wakeup_granularity_ns 2000000
  98.     write /proc/sys/kernel/sched_compat_yield 1
  99.     write /proc/sys/kernel/sched_child_runs_first 0

  101. # Create cgroup mount points for process groups
  102.     mkdir /dev/cpuctl
  103.     mount cgroup none /dev/cpuctl cpu
  104.     chown system system /dev/cpuctl
  105.     chown system system /dev/cpuctl/tasks
  106.     chmod 0777 /dev/cpuctl/tasks
  107.     write /dev/cpuctl/cpu.shares 1024

  109.     mkdir /dev/cpuctl/fg_boost
  110.     chown system system /dev/cpuctl/fg_boost/tasks
  111.     chmod 0777 /dev/cpuctl/fg_boost/tasks
  112.     write /dev/cpuctl/fg_boost/cpu.shares 1024

  114.     mkdir /dev/cpuctl/bg_non_interactive
  115.     chown system system /dev/cpuctl/bg_non_interactive/tasks
  116.     chmod 0777 /dev/cpuctl/bg_non_interactive/tasks
  117.     # 5.0 %
  118.     write /dev/cpuctl/bg_non_interactive/cpu.shares 52

  120. #[LGE_start] hyunwoong.ahn
  121.     mkdir /dvp 0771 system system
  122.     mkdir /dvp/hwkey 0771 system system
  123.     mkdir /dvp/userdata 0771 system system
  124. #[LGE_end] hyunwoong.ahn

  126.     chown system system /sys/class/leds/lcd-backlight/als

  128.     # Increase readahead buffers on MMC devices
  129.     write /sys/block/mmcblk0/bdi/read_ahead_kb 1024
  130.     write /sys/block/mmcblk1/bdi/read_ahead_kb 1024

  132. on fs
  133. # mount mtd partitions
  134.     # Mount /system rw first to give the filesystem a chance to save a checkpoint
  135.     mount ext4 /dev/block/mmcblk0p8 /system ro noatime barrier=1 wait
  136.     # We chown/chmod /data again so because mount is run as root + defaults
  137.     mount ext4 /dev/block/mmcblk0p9 /data nosuid nodev noatime barrier=1 wait
  138.     chown system system /data
  139.     chmod 0771 /data

  141. #[LGE_star]Hyunwoong.ahn^M
  142.     mount ext3 /dev/block/mmcblk0p6 /dvp/hwkey nosuid nodev
  143.     chown system system /dvp/hwkey
  144.     chown system divxdrm /dvp/hwkey/key.hw
  145.     chmod 0660 /dvp/hwkey/key.hw
  146.     mount ext3 /dev/block/mmcblk0p6 /dvp/userdata nosuid nodev
  147.     chown system divxdrm /dvp/userdata
  148.     chmod 0770 /dvp/userdata
  149.     chown system system /dev/block/mmcblk0p5
  150.     chown system system /dev/block/mmcblk0p12
  151.         chmod 0777 /dev/block/mmcblk0p5
  152.         chmod 0777 /dev/block/mmcblk0p12

  154.     mount ext4 /dev/block/mmcblk0p10 /cache nosuid nodev noatime barrier=1 wait

  156.     mkdir /lgdrm 0770 lgdrm lgdrm_acc
  157.     mount ext3 /dev/block/mmcblk0p5 /lgdrm nosuid nodev





  163. on post-fs

  165.     # once everything is setup, no need to modify /
  166.     mount rootfs rootfs / ro remount

  168.     # We chown/chmod /data again so because mount is run as root + defaults
  169.     chown system system /data
  170.     chmod 0771 /data

  172.     # Mount compressed filesystems
  173.     mount squashfs loop@/system/lib/modules/modules.sqf /system/lib/modules ro
  174.     mount squashfs loop@/system/xbin/xbin.sqf /system/xbin ro

  176.     # Create dump dir and collect dumps.
  177.     # Do this before we mount cache so eventually we can use cache for
  178.     # storing dumps on platforms which do not have a dedicated dump partition.
  179.    
  180.     mkdir /data/dontpanic
  181.     chown root log /data/dontpanic
  182.     chmod 0750 /data/dontpanic

  184.     # Collect apanic data, free resources and re-arm trigger
  185.     copy /proc/apanic_console /data/dontpanic/apanic_console
  186.     chown root log /data/dontpanic/apanic_console
  187.     chmod 0640 /data/dontpanic/apanic_console

  189.     copy /proc/apanic_threads /data/dontpanic/apanic_threads
  190.     chown root log /data/dontpanic/apanic_threads
  191.     chmod 0640 /data/dontpanic/apanic_threads

  193.     write /proc/apanic_console 1

  195.     # Same reason as /data above
  196.     chown system cache /cache
  197.     chmod 0771 /cache

  199.     # This may have been created by the recovery system with odd permissions
  200.     chown system cache /cache/recovery
  201.     chmod 0770 /cache/recovery

  203.     #change permissions on vmallocinfo so we can grab it from bugreports
  204.     chown root log /proc/vmallocinfo
  205.     chmod 0440 /proc/vmallocinfo

  207.     #change permissions on kmsg & sysrq-trigger so bugreports can grab kthread stacks
  208.     chown root system /proc/kmsg
  209.     chmod 0440 /proc/kmsg
  210.     chown root system /proc/sysrq-trigger
  211.     chmod 0220 /proc/sysrq-trigger

  213. # create basic filesystem structure
  214.     mkdir /data/misc 01771 system misc
  215.     mkdir /data/misc/bluetoothd 0770 bluetooth bluetooth
  216.     mkdir /data/misc/bluetooth 0770 system system
  217.     mkdir /data/misc/keystore 0700 keystore keystore
  218.     mkdir /data/misc/vpn 0770 system system
  219.     mkdir /data/misc/systemkeys 0700 system system
  220.     mkdir /data/misc/vpn/profiles 0770 system system
  221.     # give system access to wpa_supplicant.conf for backup and restore
  222.     mkdir /data/misc/wifi 0770 wifi wifi
  223.     chmod 0770 /data/misc/wifi
  224.     chmod 0660 /data/misc/wifi/wpa_supplicant.conf
  225.     mkdir /data/local 0771 shell shell
  226.     mkdir /data/local/tmp 0771 shell shell
  227.     mkdir /data/local/download 0771 system cache
  228.     mkdir /data/data 0771 system system
  229.     mkdir /data/app-private 0771 system system
  230.     mkdir /data/app 0771 system system
  231.     mkdir /data/property 0700 root root

  233.     mkdir /cache/download 0771 system cache

  235.     # create dalvik-cache and double-check the perms
  236.     mkdir /data/dalvik-cache 0771 system system
  237.     chown system system /data/dalvik-cache
  238.     chmod 0771 /data/dalvik-cache

  240.     mkdir /cache/dalvik-cache 0771 system system
  241.     chown system system /cache/dalvik-cache
  242.     chmod 0771 /cache/dalvik-cache

  244.     # create the lost+found directories, so as to enforce our permissions
  245.     mkdir /data/lost+found 0770
  246.     mkdir /cache/lost+found 0770

  248.     # double check the perms, in case lost+found already exists, and set owner
  249.     chown root root /data/lost+found
  250.     chmod 0770 /data/lost+found
  251.     chown root root /cache/lost+found
  252.     chmod 0770 /cache/lost+found

  254.     # allow net_raw to have access to /dev/socket directory
  255.     chown root net_raw /dev/socket
  256.     chmod 0775 /dev/socket

  258.     # allow system to modify cpufreq control files
  259.     chown root system /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
  260.     chmod 0664 /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
  261.     chown root system /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
  262.     chmod 0664 /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
  263.     chown root system /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
  264.     chmod 0664 /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq

  266.     chmod 0777 /data/misc/wifi/config_mac
  267.     mkdir /data/misc/wifi/sockets 0770 wifi wifi
  268.     mkdir /data/misc/dhcp 0777 dhcp dhcp
  269.     setprop wifi.supplicant_scan_interval 20
  270.     setprop wifi.interface wlan0

  272. on boot
  273. # basic network init
  274.     ifup lo
  275.     hostname localhost
  276.     domainname localdomain

  278. # set RLIMIT_NICE to allow priorities from 19 to -20
  279.     setrlimit 13 40 40

  281. # Define the oom_adj values for the classes of processes that can be
  282. # killed by the kernel.  These are used in ActivityManagerService.
  283.     setprop ro.FOREGROUND_APP_ADJ 0
  284.     setprop ro.VISIBLE_APP_ADJ 1
  285.     setprop ro.PERCEPTIBLE_APP_ADJ 2
  286.     setprop ro.HEAVY_WEIGHT_APP_ADJ 3
  287.     setprop ro.SECONDARY_SERVER_ADJ 4
  288.     setprop ro.BACKUP_APP_ADJ 5
  289.     setprop ro.HOME_APP_ADJ 6
  290.     setprop ro.HIDDEN_APP_MIN_ADJ 7
  291.     setprop ro.EMPTY_APP_ADJ 15

  293. # Define the memory thresholds at which the above process classes will
  294. # be killed.  These numbers are in pages (4k).
  295.     setprop ro.FOREGROUND_APP_MEM 2048
  296.     setprop ro.VISIBLE_APP_MEM 3072
  297.     setprop ro.PERCEPTIBLE_APP_MEM 4096
  298.     setprop ro.HEAVY_WEIGHT_APP_MEM 4096
  299.     setprop ro.SECONDARY_SERVER_MEM 6144
  300.     setprop ro.BACKUP_APP_MEM 6144
  301.     setprop ro.HOME_APP_MEM 6144
  302.     setprop ro.HIDDEN_APP_MEM 7168
  303.     setprop ro.EMPTY_APP_MEM 8192

  305. # Write value must be consistent with the above properties.
  306. # Note that the driver only supports 6 slots, so we have combined some of
  307. # the classes into the same memory level; the associated processes of higher
  308. # classes will still be killed first.
  309.     write /sys/module/lowmemorykiller/parameters/adj 0,1,2,4,7,15

  311.     write /proc/sys/vm/overcommit_memory 1
  312.     write /proc/sys/vm/min_free_order_shift 4
  313.     write /sys/module/lowmemorykiller/parameters/minfree 2048,3072,4096,6144,7168,8192

  315.     # Set init its forked children's oom_adj.
  316.     write /proc/1/oom_adj -16

  318.     # Tweak background writeout
  319.     write /proc/sys/vm/dirty_expire_centisecs 200
  320.     write /proc/sys/vm/dirty_background_ratio  5

  322.     # Permissions for System Server and daemons.
  323.     chown radio system /sys/android_power/state
  324.     chown radio system /sys/android_power/request_state
  325.     chown radio system /sys/android_power/acquire_full_wake_lock
  326.     chown radio system /sys/android_power/acquire_partial_wake_lock
  327.     chown radio system /sys/android_power/release_wake_lock
  328.     chown radio system /sys/power/state
  329.     chown radio system /sys/power/wake_lock
  330.     chown radio system /sys/power/wake_unlock
  331.     chmod 0660 /sys/power/state
  332.     chmod 0660 /sys/power/wake_lock
  333.     chmod 0660 /sys/power/wake_unlock
  334.     chown system system /sys/class/timed_output/vibrator/enable
  335.     chown system system /sys/class/leds/keyboard-backlight/brightness
  336.     chown system system /sys/class/leds/lcd-backlight/brightness
  337.     chown system system /sys/class/leds/button-backlight/brightness
  338.     chown system system /sys/class/leds/jogball-backlight/brightness
  339.     chown system system /sys/class/leds/red/brightness
  340.     chown system system /sys/class/leds/green/brightness
  341.     chown system system /sys/class/leds/blue/brightness
  342.     chown system system /sys/class/leds/red/device/grpfreq
  343.     chown system system /sys/class/leds/red/device/grppwm
  344.     chown system system /sys/class/leds/red/device/blink
  345.     chown system system /sys/class/leds/red/brightness
  346.     chown system system /sys/class/leds/green/brightness
  347.     chown system system /sys/class/leds/blue/brightness
  348.     chown system system /sys/class/leds/red/device/grpfreq
  349.     chown system system /sys/class/leds/red/device/grppwm
  350.     chown system system /sys/class/leds/red/device/blink
  351.     chown system system /sys/class/timed_output/vibrator/enable
  352.     chown system system /sys/module/sco/parameters/disable_esco
  353.     chown system system /sys/kernel/ipv4/tcp_wmem_min
  354.     chown system system /sys/kernel/ipv4/tcp_wmem_def
  355.     chown system system /sys/kernel/ipv4/tcp_wmem_max
  356.     chown system system /sys/kernel/ipv4/tcp_rmem_min
  357.     chown system system /sys/kernel/ipv4/tcp_rmem_def
  358.     chown system system /sys/kernel/ipv4/tcp_rmem_max
  359.     chown root radio /proc/cmdline

  361. # Define TCP buffer sizes for various networks
  362. #   ReadMin, ReadInitial, ReadMax, WriteMin, WriteInitial, WriteMax,
  363.     setprop net.tcp.buffersize.default 4096,87380,110208,4096,16384,110208
  364.     setprop net.tcp.buffersize.wifi    4095,87380,110208,4096,16384,110208
  365.     setprop net.tcp.buffersize.umts    4094,87380,110208,4096,16384,110208
  366.     setprop net.tcp.buffersize.edge    4093,26280,35040,4096,16384,35040
  367.     setprop net.tcp.buffersize.hspa    4094,87380,110208,4096,16384,110208
  368.     setprop net.tcp.buffersize.gprs    4092,8760,11680,4096,8760,11680

  370.     chmod 0660 /sys/class/rfkill/rfkill0/state
  371.     chmod 0660 /sys/class/rfkill/rfkill0/type
  372.     chmod 0660 /sys/class/rfkill/rfkill1/state
  373.     chmod 0660 /sys/class/rfkill/rfkill1/type
  374.     chmod 0666 /sys/devices/platform/bd_address/bdaddr_if
  375.     chown bluetooth bluetooth /sys/class/rfkill/rfkill0/state
  376.     chown bluetooth bluetooth /sys/class/rfkill/rfkill0/type
  377.     chown bluetooth bluetooth /sys/class/rfkill/rfkill1/state
  378.     chown bluetooth bluetooth /sys/class/rfkill/rfkill1/type
  379.     write /sys/class/rfkill/rfkill0/state 0

  381.     chown system system /sys/devices/platform/motion_sensor/accel_onoff
  382.     chown system system /sys/devices/platform/motion_sensor/accel_delay
  383.     chown system system /sys/devices/platform/motion_sensor/compass_onoff
  384.     chown system system /sys/devices/platform/motion_sensor/compass_delay
  385.     chown system system /sys/devices/platform/motion_sensor/tilt_onoff
  386.     chown system system /sys/devices/platform/motion_sensor/tilt_delay
  387.     chown system system /sys/devices/platform/motion_sensor/gyro_onoff
  388.     chown system system /sys/devices/platform/motion_sensor/gyro_delay
  389.     chown system system /sys/bus/i2c/drivers/hub_proxi/3-0044/onoff
  390.     chown system system /sys/bus/i2c/drivers/hub_proxi/3-0044/delay
  391.     chown system system /sys/devices/platform/motion_sensor/shake_onoff
  392.     chown system system /sys/bus/i2c/drivers/kxtf9/3-000f/shake_onoff
  393.     chown system system /sys/devices/platform/motion_sensor/snap_onoff
  394.     chown system system /sys/bus/i2c/drivers/kxtf9/3-000f/snap_onoff
  395.     chown system system /sys/devices/platform/motion_sensor/flip_onoff
  396.     chown system system /sys/bus/i2c/drivers/kxtf9/3-000f/flip_onoff
  397.     chown system system /sys/devices/platform/motion_sensor/tap_onoff
  398.     chown system system /sys/bus/i2c/drivers/kxtf9/3-000f/tap_onoff
  399.     chown system system /sys/devices/platform/motion_sensor/yawimage_onoff
  400.     chown system system /sys/devices/platform/i2c-gpio.7/i2c-adapter/i2c-7/7-001c/checkresult
  401.     chown system system /sys/devices/platform/i2c-gpio.7/i2c-adapter/i2c-7/7-001c/checkopmode
  402.     chmod 0666 /sys/devices/platform/motion_sensor/accel_onoff
  403.     chmod 0666 /sys/devices/platform/motion_sensor/accel_delay
  404.     chmod 0666 /sys/devices/platform/motion_sensor/compass_onoff
  405.     chmod 0666 /sys/devices/platform/motion_sensor/compass_delay
  406.     chmod 0666 /sys/devices/platform/motion_sensor/tilt_onoff
  407.     chmod 0666 /sys/devices/platform/motion_sensor/tilt_delay
  408.     chmod 0666 /sys/devices/platform/motion_sensor/gyro_onoff
  409.     chmod 0666 /sys/devices/platform/motion_sensor/gyro_delay
  410.     chmod 0666 /sys/bus/i2c/drivers/hub_proxi/3-0044/onoff
  411.     chmod 0666 /sys/bus/i2c/drivers/hub_proxi/3-0044/delay
  412.     chmod 0666 /sys/devices/platform/motion_sensor/shake_onoff
  413.     chmod 0666 /sys/bus/i2c/drivers/kxtf9/3-000f/shake_onoff
  414.     chmod 0666 /sys/devices/platform/motion_sensor/snap_onoff
  415.     chmod 0666 /sys/bus/i2c/drivers/kxtf9/3-000f/snap_onoff
  416.     chmod 0666 /sys/devices/platform/motion_sensor/flip_onoff
  417.     chmod 0666 /sys/bus/i2c/drivers/kxtf9/3-000f/flip_onoff
  418.     chmod 0666 /sys/devices/platform/motion_sensor/tap_onoff
  419.     chmod 0666 /sys/bus/i2c/drivers/kxtf9/3-000f/tap_onoff
  420.     chmod 0666 /sys/devices/platform/motion_sensor/yawimage_onoff
  421.     chmod 0666 /sys/devices/platform/i2c-gpio.7/i2c-adapter/i2c-7/7-001c/checkresult
  422.     chmod 0666 /sys/devices/platform/i2c-gpio.7/i2c-adapter/i2c-7/7-001c/checkopmode

  424.     chmod 0666 /sys/devices/platform/omapdss/display0/name
  425.     chmod 0666 /sys/devices/platform/omapdss/display1/name
  426.     chmod 0666 /sys/devices/platform/omapdss/display0/enabled
  427.     chmod 0666 /sys/devices/platform/omapdss/display1/enabled
  428.     chmod 0666 /sys/devices/platform/omapdss/display0/timings
  429.     chmod 0666 /sys/devices/platform/omapdss/display1/timings
  430.     chmod 0666 /sys/devices/platform/omapdss/overlay0/manager
  431.     chmod 0666 /sys/devices/platform/omapdss/overlay1/manager
  432.     chmod 0666 /sys/devices/platform/omapdss/overlay2/manager
  433.     chmod 0666 /sys/devices/platform/omapdss/overlay0/zorder
  434.     chmod 0666 /sys/devices/platform/omapdss/overlay1/zorder
  435.     chmod 0666 /sys/devices/platform/omapdss/overlay2/zorder
  436.     chmod 0666 /sys/devices/platform/omapdss/overlay0/enabled
  437.     chmod 0666 /sys/devices/platform/omapdss/overlay1/enabled
  438.     chmod 0666 /sys/devices/platform/omapdss/overlay2/enabled
  439.     chmod 0666 /sys/devices/platform/omapdss/manager0/display
  440.     chmod 0666 /sys/devices/platform/omapdss/manager1/display
  441.     chmod 0666 /sys/devices/platform/omapdss/manager0/trans_key_enabled
  442.     chmod 0666 /sys/devices/platform/omapdss/manager1/trans_key_enabled
  443.     chmod 0666 /sys/devices/platform/omapdss/manager0/trans_key_type
  444.     chmod 0666 /sys/devices/platform/omapdss/manager1/trans_key_type
  445.     chmod 0666 /sys/devices/platform/omapdss/manager0/trans_key_value
  446.     chmod 0666 /sys/devices/platform/omapdss/manager1/trans_key_value
  447.     chmod 0666 /sys/devices/platform/omapdss/manager0/alpha_blending_enabled
  448.     chmod 0666 /sys/devices/platform/omapdss/manager1/alpha_blending_enabled
  449.     write /sys/devices/platform/omapdss/manager0/alpha_blending_enabled 1

  451. # MMS: Create log directory for fw3a_core
  452.     mkdir /data/log/fw3A 0775 root root

  454. # change permissions for alsa nodes
  455.     symlink /dev/snd/pcmC0D0c /dev/pcmC0D0c
  456.     symlink /dev/snd/pcmC0D0p /dev/pcmC0D0p
  457.     symlink /dev/snd/controlC0 /dev/controlC0
  458.     symlink /dev/snd/timer /dev/timer
  459.     chmod 0777 /dev/pcmC0D0c
  460.     chmod 0777 /dev/pcmC0D0p
  461.     chmod 0777 /dev/controlC0
  462.     chmod 0777 /dev/timer

  464.     chmod 0664 /sys/devices/platform/i2c_omap.2/i2c-2/2-0060/leds/lcd-backlight/als
  465.     chown system system /sys/devices/platform/i2c_omap.2/i2c-2/2-0060/leds/lcd-backlight/als

  467.     # Batt gauge error detection
  468.     chmod 0666 /sys/bus/platform/drivers/twl4030_bci/twl4030_bci/gauge_if

  470.     # Enabling sleep in idle path
  471.     write /sys/power/sleep_while_idle 1

  473.     # Enabling Off mode
  474.     write /sys/power/enable_off_mode 1

  476.     # Enabling voltage off while idle
  477.     write /sys/power/voltage_off_while_idle 1

  479.     # Permissions for setting the DSP Frequency
  480.     chown media root /sys/power/dsp_freq
  481.     chown media system /sys/devices/platform/omap3isp/isp_reserve

  483. # Include extra init file
  484.     import /system/etc/init.local.rc

  486. # gps permissions
  487.     chown system system /sys/devices/platform/hub_gps_gpio/poweron
  488.     chown system system /sys/devices/platform/hub_gps_gpio/reset
  489.     mkdir /data/gps
  490.     chmod 777 /data/gps
  491.     mkdir /data/gps/var
  492.     chmod 777 /data/gps/var
  493.     mkdir /data/gps/var/run
  494.     chmod 777 /data/gps/var/run
  495.     mkdir /data/gps/log
  496.     chmod 777 /data/gps/log
  497.     mkdir /data/cache
  498.     chmod 777 /data/cache

  500.     ## Torch perms
  501.     chown system camera /sys/class/leds/rt8515/brightness
  502.     chmod 0660 /sys/class/leds/rt8515/brightness

  504.     ## liblights
  505.     chown system system /sys/class/leds/lcd-backlight/brightness
  506.     chown system system /sys/class/leds/lcd-backlight/onoff
  507.     chown system system /sys/devices/platform/i2c_omap.2/i2c-2/2-001a/led_brightness
  508.     chown system system /sys/devices/platform/i2c_omap.2/i2c-2/2-001a/led_onoff
  509.     chown system system /sys/devices/platform/i2c_omap.2/i2c-2/2-001a/led_sync
  510.     chown system system /sys/devices/platform/i2c_omap.2/i2c-2/2-001a/blink_enable
  511.     chown system system /sys/devices/platform/i2c_omap.2/i2c-2/2-001a/0x06
  512.     chown system system /sys/devices/platform/i2c_omap.2/i2c-2/2-001a/0x07
  513.     chown system system /sys/devices/platform/i2c_omap.2/i2c-2/2-001a/0x0D
  514.     chown system system /sys/devices/platform/i2c_omap.2/i2c-2/2-001a/0x0E
  515.     chown system system /sys/devices/platform/i2c_omap.2/i2c-2/2-001a/0x10
  516.     chown system system /sys/devices/platform/i2c_omap.2/i2c-2/2-001a/0x11
  517.     chown system system /sys/devices/platform/i2c_omap.2/i2c-2/2-001a/0x03
  518.     chown system system /sys/devices/platform/i2c_omap.2/i2c-2/2-001a/0x04
  519.     chown system system /sys/devices/platform/i2c_omap.2/i2c-2/2-001a/0x09
  520.     chown system system /sys/devices/platform/i2c_omap.2/i2c-2/2-001a/0x0A
  521.     chown system system /sys/devices/platform/i2c_omap.2/i2c-2/2-001a/0x13
  522.     chown system system /sys/devices/platform/i2c_omap.2/i2c-2/2-001a/0x14

  524. # Run sysinit
  525.     exec /system/bin/sysinit

  527.     class_start default

  529. ## Daemon processes to be run by init.
  530. ##
  531. service ueventd /sbin/ueventd
  532.     critical

  534. service prb /sbin/prb
  535.     user root
  536.     disabled
  537.     oneshot
  538.     keycodes 114 116

  540. service console /system/bin/sh
  541.     console
  542.     disabled
  543.     user shell
  544.     group log

  546. on property:ro.secure=0
  547.     start console

  549. # adbd is controlled by the persist.service.adb.enable system property
  550. service adbd /sbin/adbd
  551.     disabled

  553. # adbd on at boot in emulator
  554. on property:ro.kernel.qemu=1
  555.     start adbd

  557. on property:persist.service.adb.enable=1
  558.     start adbd

  560. on property:persist.service.adb.enable=0
  561.     stop adbd

  563. service pvrsrvinit /system/bin/pvrsrvinit
  564.         user root
  565.         oneshot

  567. # load DSP firmware 防火墙
  568. service baseimage /system/bin/cexec.out /system/lib/dsp/baseimage.dof
  569.     user root
  570.     group audio
  571.     oneshot

  573. service fw3a /system/bin/fw3a_core --dbgport=6660 --dbgremote --dbgpath=/data/log/fw3A
  574.     user root
  575.     group root

  577. service servicemanager /system/bin/servicemanager
  578.     user system
  579.     critical
  580.     onrestart restart zygote
  581.     onrestart restart media

  583. service vold /system/bin/vold
  584.     socket vold stream 0660 root mount
  585.     ioprio be 2

  587. service netd /system/bin/netd
  588.     socket netd stream 0660 root system
  589.     socket dnsproxyd stream 0660 root inet

  591. service debuggerd /system/bin/debuggerd

  593. service ril-daemon /system/bin/rild
  594.     socket rild stream 660 root radio
  595.     socket rild-debug stream 660 radio system
  596.     user root
  597.     group radio cache inet misc audio sdcard_rw net_admin net_raw

  599. service zygote /system/bin/app_process -Xzygote /system/bin --zygote --start-system-server
  600.     socket zygote stream 666
  601.     onrestart write /sys/android_power/request_state wake
  602.     onrestart write /sys/power/state on
  603.     onrestart restart media
  604.     onrestart restart netd

  606. service media /system/bin/mediaserver
  607.     user media
  608.     group system audio camera graphics inet net_bt net_bt_admin net_raw
  609.     ioprio rt 4

  611. service bootanim /system/bin/bootanimation
  612.     user graphics
  613.     group graphics
  614.     disabled
  615.     oneshot

  617. service dbus /system/bin/dbus-daemon --system --nofork
  618.     socket dbus stream 660 bluetooth bluetooth
  619.     user bluetooth
  620.     group bluetooth net_bt_admin

  622. service bluetoothd /system/bin/bluetoothd -n
  623.     socket bluetooth stream 660 bluetooth bluetooth
  624.     socket dbus_bluetooth stream 660 bluetooth bluetooth
  625.     # init.rc does not yet support applying capabilities, so run as root and
  626.     # let bluetoothd drop uid to bluetooth with the right linux capabilities
  627.     group bluetooth net_bt_admin misc
  628.     disabled

  630. service hfag /system/bin/sdptool add --channel=10 HFAG
  631.     user bluetooth
  632.     group bluetooth net_bt_admin
  633.     disabled
  634.     oneshot

  636. service hsag /system/bin/sdptool add --channel=11 HSAG
  637.     user bluetooth
  638.     group bluetooth net_bt_admin
  639.     disabled
  640.     oneshot

  642. service opush /system/bin/sdptool add --channel=12 OPUSH
  643.     user bluetooth
  644.     group bluetooth net_bt_admin
  645.     disabled
  646.     oneshot

  648. service pbap /system/bin/sdptool add --channel=19 PBAP
  649.     user bluetooth
  650.     group bluetooth net_bt_admin
  651.     disabled
  652.     oneshot

  654. service installd /system/bin/installd
  655.     socket installd stream 600 system system

  657. service racoon /system/bin/racoon
  658.     socket racoon stream 600 system system
  659.     # racoon will setuid to vpn after getting necessary resources.
  660.     group net_admin
  661.     disabled
  662.     oneshot

  664. service mtpd /system/bin/mtpd
  665.     socket mtpd stream 600 system system
  666.     user vpn
  667.     group vpn net_admin net_raw
  668.     disabled
  669.     oneshot

  671. service keystore /system/bin/keystore /data/misc/keystore
  672.     user keystore
  673.     group keystore
  674.     socket keystore stream 666

  676. service dumpstate /system/bin/dumpstate -s
  677.     socket dumpstate stream 0660 shell log
  678.     disabled
  679.     oneshot
  680. #开启GPS服务，配置文件位置位于：/system/etc/gps_brcm_conf.xml
  681. service glgps /system/bin/glgps -c /system/etc/gps_brcm_conf.xml
  682.     user root
  683.     group system

  685. on property:dev.bootcomplete=1
  686.     write /sys/devices/platform/i2c_omap.2/i2c-2/2-001a/blink_enable 0
  687.     write /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor "interactive"
  688.     #write /sys/devices/system/cpu/cpu0/cpufreq/ondemand/up_threshold 90
  689.     #write /sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate 40000
  690.     write /sys/devices/system/cpu/cpu0/cpufreq/turn_on_lg_dvfs 1

  692. service dhcpcd_wlan0 /system/bin/dhcpcd -BKA wlan0
  693.     disabled
  694.     oneshot

  696. service iprenew_wlan0 /system/bin/dhcpcd -n wlan0
  697.     disabled
  698.     oneshot

  700. on property:init.svc.wpa_supplicant=stopped
  701.     stop dhcpcd_wlan0

  703. service wpa_supplicant /system/bin/wpa_supplicant -Dwext -iwlan0 -c/data/misc/wifi/wpa_supplicant.conf #-dd
  704.     socket wpa_wlan0 dgram 660 wifi wifi
  705.     group system wifi inet
  706.     disabled

  708. service hciattach /system/bin/brcm_patchram_plus --enable_hci --enable_lpm \
  709.     --baudrate 3000000 --patchram /etc/firmware/BCM43291A0_003.001.013.0066.xxxx_B-Project.hcd /dev/ttyO1
  710.     user bluetooth
  711.     group bluetooth net_bt_admin
  712.     disabled

  714. service rawip_vsnet1 /system/bin/init.vsnet 1
  715.    user root
  716.    group radio cache inet misc
  717.    disabled
  718.    oneshot

  720. service wlan_precheck /system/bin/wlan-precheck
  721.     oneshot
复制代码

++++++++++++++++++++++++++++++++++++++++语法+++++++++++++++++++++++++++++++++++++++++++++++++++
  1. system/core/init/readme.txt（此文也是对init.rc 的解释）内容不同：
  2. socket <name> <type> <perm> [ <user> [ <group> ] ]
  3. －－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－

  5. 注1：另外还讲述了怎样输出log：


  8. Debugging notes
  9. ---------------
  10. By default, programs executed by init will drop stdout and stderr into
  11. /dev/null. To help with debugging, you can execute your program via the
  12. Andoird program logwrapper. This will redirect stdout/stderr into the
  13. Android logging system (accessed via logcat).
  14. For example
  15. service akmd /system/bin/logwrapper /sbin/akmd
  16. 注2：讲述了一个新的命令




  21. sysclktz <mins_west_of_gmt>
  22.    Set the system clock base (0 if system clock ticks in GMT)



  26. 注3：triggers



  30. boot
  31.    This is the first trigger that will occur when init starts
  32.    (after /init.conf is loaded)
  33. <name>=<value>
  34.    Triggers of this form occur when the property <name> is set
  35.    to the specific value <value>.
  36. device-added-<path>
  37. device-removed-<path>
  38.    Triggers of these forms occur when a device node is added
  39.    or removed.
  40. service-exited-<name>
  41.    Triggers of this form occur when the specified service exits.
  42. －－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－





  48. init 由如下四种类型语句组成：

  50. Actionn       ：行为
  51. Commands  
  52. Services
  53. Options
  54. 语法(language syntax)结构如下：


  57. 每一个语句占据一行，并且各个关键字被空格分开。c规范中的（如 /n）反斜杠将被忽略(backslash escapes)而被认为是一个空格 ，双引号用来保证空格不会把一个文字串分分为多个关键字。行最后的反斜杠用作续行。
  58. 由 # （前面允许有空格）开始的行都是注释行(comment)
  59. 一个actions 或 services 的开始隐含声明了一个新的段，所有commands 或 options 属于最近的声明。在第一个段之前的 commands 或 options 都会被忽略
  60. 每一个actions 和 services 都有不同的名字。后面与前面发生重名的，那么这个后面重名的将被忽略或被认为是一个错误
  61. Actions
  62. Actions其实就是一组被命名的命令序列。actions 都有一个触发条件，触发条件决定了action何时执行。当一个事件发生如果匹配action的触发条件，那么这个action将会被添加到预备执行队列的尾部（除非它已经在队列当中）

  64. 每一个action中的命令将被顺序执行。init进程负责在其它activities（如：设备创建/销毁，属性设置，进程重启）之间执行这些命令序列。



  68. action 的格式如下
  69. on <trigger>
  70.   <command>
  71.   <command>
  72.   <command>


  75. Services

  77. services 是一些由init 启动 和 重新（如果有需要）启动的程序，当然这些程序如果是存在的。




  82. services 的格式如下：
  83. service <name> <pathname> [ <argument> ]*
  84.   <option>
  85.   <option>
  86.   ...




  91. Options

  93. options 是service的修饰符，用来告诉init 怎样及何时启动service。



  97. Option        Description
  98. disabled        This service will not automatically start with its class. It must be explicitly started by name.
  99. socket <type> <name> <perm> [ <user> [ <group> ] ]       
  100. Create a unix domain socket named /dev/socket/<name> and pass its fd to the launched process. Valid <type>dgram and stream. user and group default to 0.(type 实际中是放在name之后)

  102. values include
  103. user <username>        Change to username before exec'ing this service. Currently defaults to root.
  104. group <groupname> [ <groupname> ]*        Change to groupname before exec'ing this service.  Additional  groupnames beyond the first, which is required, are used to set additional groups of the process (with setgroups()). Currently defaults to root.
  105. capability [ <capability> ]+        Set linux capability before exec'ing this service
  106. oneshot        Do not restart the service when it exits.
  107. class <name>        Specify a class name for the service.  All services in a named class must start and stop together. A service is considered of class "default" if one is not specified via the class option.




  112. Triggers

  114. Triggers are strings used to match certain kinds of events that cause an action to occur.

  116. Trigger        Description
  117. boot        This is the first trigger that occurs when init starts (after /init.conf is loaded).
  118. <name>=<value>        Triggers of this form occur when the property <name> is set to the specific value <value>.
  119. device-added-<path>
  120. device-removed-<path>        Triggers of these forms occur when a device node is added or removed.
  121. service-exited-<name>        Triggers of this form occur when the specified service exits.

  123. Commands

  125. Command        Description
  126. exec <path> [ <argument> ]*        Fork and execute a program (<path>). This will block until the program completes execution. Try to avoid exec. Unlike the builtin commands, it runs the risk of getting init "stuck".
  127. export <name> <value>        Set the environment variable <name> equal to <value> in the global environment (which will be inherited by all processes started after this command is executed).
  128. ifup <interface>        Bring the network interface <interface> online.
  129. import <filename>        Parse an init config file, extending the current configuration.
  130. hostname <name>        Set the host name.
  131. class_start <serviceclass>        Start all services of the specified class if they are not already running.
  132. class_stop <serviceclass>        Stop all services of the specified class if they are currently running.
  133. domainname <name>        Set the domain name.
  134. insmod <path>        Install the module at <path>.
  135. mkdir <path>        Make a directory at <path>.
  136. mount <type> <device> <dir> [ <mountoption> ]*        Attempt to mount the named device at the directory <dir> <device>. This may be of the form mtd@name to specify a mtd block device by name.
  137. setkey        - currenlty undefined -
  138. setprop <name> <value>        Set system property <name> to <value>.
  139. setrlimit <resource> <cur> <max>        Set the rlimit for a resource.
  140. start <service>        Start a service running if it is not already running.
  141. stop <service>        Stop a service from running if it is currently running.
  142. symlink <target> <path>        Create a symbolic link at <path> with the value <target>.
  143. write <path> <string> [ <string> ]*        Open the file at <path> and write one or more strings to it with write(2).
  144. Properties

  146. Init updates some system properties to provide some insight into
  147. what it's doing:
  148. Property        Description
  149. init.action        Equal to the name of the action currently being executed or "" if none.
  150. init.command        Equal to the command being executed or "" if none.
  151. init.svc.<name>        State of a named service ("stopped", "running", or "restarting").
  152. 在init.rc中使用属性的范例如下：



  156. setprop ro.FOREGROUND_APP_MEM 1536

  158. setprop ro.VISIBLE_APP_MEM 2048

  160. on property:ro.kernel.qemu=1

  162. start adbd

  164. setprop用于设置属性，on property可以用于判断属性，这里的属性在整个Android系统运行中都是一致的。



  168. init脚本中的关键字可以参考：system/core/init/keywords.h

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