此文来自于对http://source./porting/index.html中bring up段的简译。其中有一处与源码的 system/core/init/readme.txt(此文也是对init.rc 的解释)内容不同: socket <name> <type> <perm> [ <user> [ <group> ] ] -----------------------------------------------
Debugging notes 注2:讲述了一个新的命令--------------- By default, programs executed by init will drop stdout and stderr into /dev/null. To help with debugging, you can execute your program via the Andoird program logwrapper. This will redirect stdout/stderr into the Android logging system (accessed via logcat). For example service akmd /system/bin/logwrapper /sbin/akmd
sysclktz <mins_west_of_gmt> Set the system clock base (0 if system clock ticks in GMT)
注3:triggers
boot This is the first trigger that will occur when init starts (after /init.conf is loaded) <name>=<value> Triggers of this form occur when the property <name> is set to the specific value <value>. device-added-<path> device-removed-<path> Triggers of these forms occur when a device node is added or removed. service-exited-<name> Triggers of this form occur when the specified service exits. ------------------------------------------
init 由如下四种类型语句组成:
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) 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。
Services 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。
Options options 是service的修饰符,用来告诉init 怎样及何时启动service。
Triggers Triggers are strings used to match certain kinds of events that cause an action to occur.
Properties what it's doing:
在init.rc中使用属性的范例如下:
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。 init脚本中的关键字可以参考:system/core/init/keywords.h
exam init.rc ---------------------------
on init sysclktz 0 loglevel 3 # setup the global environment export PATH /sbin:/system/sbin:/system/bin:/system/xbin:/system/busybox/bin:/system/busybox/sbin:/system/busybox/usr/bin:/system/busybox/usr/sbin export LD_LIBRARY_PATH /system/lib export ANDROID_BOOTLOGO 1 export ANDROID_ROOT /system export ANDROID_ASSETS /system/app export ANDROID_DATA /data export EXTERNAL_STORAGE /sdcard export BOOTCLASSPATH /system/framework/core.jar:/system/framework/ext.jar:/system/framework/framework.jar:/system/framework/android.policy.jar:/system/framework/services.jar # Backward compatibility symlink /system/etc /etc symlink /sys/kernel/debug /d # create mountpoints and mount tmpfs on sqlite_stmt_journals mkdir /sdcard 0000 system system mkdir /system mkdir /data 0771 system system mkdir /cache 0770 system cache mkdir /config 0500 root root mkdir /sqlite_stmt_journals 01777 root root mount tmpfs tmpfs /sqlite_stmt_journals size=4m #{{ added by FriendlyARM mkdir /udisk 0000 system system mkdir /var 0000 system system mount tmpfs tmpfs /var size=2m mkdir /var/lock mkdir /var/run mkdir /var/log mount usbfs none /proc/bus/usb -o devmode=0666 chmod 0666 /dev/backlight-1wire #}} ## mount rootfs rootfs / ro remount write /proc/sys/kernel/panic_on_oops 1 write /proc/sys/kernel/hung_task_timeout_secs 0 write /proc/cpu/alignment 4 write /proc/sys/kernel/sched_latency_ns 10000000 write /proc/sys/kernel/sched_wakeup_granularity_ns 2000000 write /proc/sys/kernel/sched_compat_yield 1 write /proc/sys/kernel/sched_child_runs_first 0 # Create cgroup mount points for process groups mkdir /dev/cpuctl mount cgroup none /dev/cpuctl cpu chown system system /dev/cpuctl chown system system /dev/cpuctl/tasks chmod 0777 /dev/cpuctl/tasks write /dev/cpuctl/cpu.shares 1024 mkdir /dev/cpuctl/fg_boost chown system system /dev/cpuctl/fg_boost/tasks chmod 0777 /dev/cpuctl/fg_boost/tasks write /dev/cpuctl/fg_boost/cpu.shares 1024 mkdir /dev/cpuctl/bg_non_interactive chown system system /dev/cpuctl/bg_non_interactive/tasks chmod 0777 /dev/cpuctl/bg_non_interactive/tasks # 5.0 % write /dev/cpuctl/bg_non_interactive/cpu.shares 52 # mount mtd partitions # Mount /system rw first to give the filesystem a chance to save a checkpoint ## mount yaffs2 mtd@system /system ## mount yaffs2 mtd@system /system ro remount # We chown/chmod /data again so because mount is run as root + defaults ## mount yaffs2 mtd@userdata /data nosuid nodev chown system system /data chmod 0771 /data # Create dump dir and collect dumps. # Do this before we mount cache so eventually we can use cache for # storing dumps on platforms which do not have a dedicated dump partition. mkdir /data/dontpanic chown root log /data/dontpanic chmod 0750 /data/dontpanic # Collect apanic data, free resources and re-arm trigger copy /proc/apanic_console /data/dontpanic/apanic_console chown root log /data/dontpanic/apanic_console chmod 0640 /data/dontpanic/apanic_console copy /proc/apanic_threads /data/dontpanic/apanic_threads chown root log /data/dontpanic/apanic_threads chmod 0640 /data/dontpanic/apanic_threads write /proc/apanic_console 1 # Collect ramconsole data copy /proc/last_kmsg /data/dontpanic/last_kmsg chown root log /data/dontpanic/last_kmsg chmod 0640 /data/dontpanic/last_kmsg # Same reason as /data above ## mount yaffs2 mtd@cache /cache nosuid nodev chown system cache /cache chmod 0770 /cache # This may have been created by the recovery system with odd permissions chown system system /cache/recovery chmod 0770 /cache/recovery #change permissions on vmallocinfo so we can grab it from bugreports chown root log /proc/vmallocinfo chmod 0440 /proc/vmallocinfo # create basic filesystem structure mkdir /data/misc 01777 system misc mkdir /data/misc/bluetoothd 0777 bluetooth bluetooth mkdir /data/misc/keystore 0700 keystore keystore mkdir /data/misc/vpn 0770 system system mkdir /data/misc/vpn/profiles 0770 system system mkdir /data/misc/wifi 0777 wifi wifi mkdir /data/misc/wifi/sockets 0777 system wifi chmod 0777 /data/misc/wifi chmod 0777 /data/misc/wifi/wpa_supplicant.conf # give system access to wpa_supplicant.conf for backup and restore chmod 0777 /system/etc/wifi/wpa_supplicant.conf mkdir /data/misc/dhcp 0770 dhcp dhcp chown dhcp dhcp /data/misc/dhcp mkdir /data/local 0771 shell shell mkdir /data/local/tmp 0771 shell shell mkdir /data/data 0771 system system mkdir /data/app-private 0771 system system mkdir /data/app 0771 system system mkdir /data/property 0700 root root # create dalvik-cache and double-check the perms mkdir /data/dalvik-cache 0771 system system chown system system /data/dalvik-cache chmod 0771 /data/dalvik-cache # create the lost+found directories, so as to enforce our permissions mkdir /data/lost+found 0770 mkdir /cache/lost+found 0770 # double check the perms, in case lost+found already exists, and set owner chown root root /data/lost+found chmod 0770 /data/lost+found chown root root /cache/lost+found chmod 0770 /cache/lost+found #=================================================================== # # debug fs enable for wifi & bluetooth # #=================================================================== mount debugfs none /sys/kernel/debug on boot # basic network init ifup lo ifup eth0 ifup eth1 hostname localhost domainname localdomain # set RLIMIT_NICE to allow priorities from 19 to -20 setrlimit 13 40 40 # Define the oom_adj values for the classes of processes that can be # killed by the kernel. These are used in ActivityManagerService. setprop ro.FOREGROUND_APP_ADJ 0 setprop ro.VISIBLE_APP_ADJ 1 setprop ro.SECONDARY_SERVER_ADJ 2 setprop ro.BACKUP_APP_ADJ 2 setprop ro.HOME_APP_ADJ 4 setprop ro.HIDDEN_APP_MIN_ADJ 7 setprop ro.CONTENT_PROVIDER_ADJ 14 setprop ro.EMPTY_APP_ADJ 15 # Define the memory thresholds at which the above process classes will # be killed. These numbers are in pages (4k). setprop ro.FOREGROUND_APP_MEM 1536 setprop ro.VISIBLE_APP_MEM 2048 setprop ro.SECONDARY_SERVER_MEM 4096 setprop ro.BACKUP_APP_MEM 4096 setprop ro.HOME_APP_MEM 4096 setprop ro.HIDDEN_APP_MEM 5120 setprop ro.CONTENT_PROVIDER_MEM 5632 setprop ro.EMPTY_APP_MEM 6144 #Wifi # insmod /system/lib/libwifi/lib80211.ko # insmod /system/lib/libwifi/lib80211_crypt_ccmp.ko # insmod /system/lib/libwifi/lib80211_crypt_tkip.ko # insmod /system/lib/libwifi/lib80211_crypt_wep.ko # insmod /system/lib/modules/2.6.27/kernel/net/bluetooth/bluetooth.ko # insmod /system/lib/modules/2.6.27/kernel/drivers/bluetooth/hci_uart.ko # insmod /system/lib/modules/2.6.27/kernel/net/bluetooth/l2cap.ko # insmod /system/lib/modules/2.6.27/kernel/net/bluetooth/rfcomm/rfcomm.ko setprop wifi.interface eth1 setprop wlan.interface eth1 setprop wlan.driver.status ok setprop wlan.modpath /system/lib/libwifi/ setprop wlan.mod1 libertas.ko setprop wlan.mod2 libertas_sdio.ko # Write value must be consistent with the above properties. # Note that the driver only supports 6 slots, so we have HOME_APP at the # same memory level as services. write /sys/module/lowmemorykiller/parameters/adj 0,1,2,7,14,15 write /proc/sys/vm/overcommit_memory 1 write /proc/sys/vm/min_free_order_shift 4 write /sys/module/lowmemorykiller/parameters/minfree 1536,2048,4096,5120,5632,6144 # Set init its forked children's oom_adj. write /proc/1/oom_adj -16 # Tweak background writeout write /proc/sys/vm/dirty_expire_centisecs 200 write /proc/sys/vm/dirty_background_ratio 5 # Permissions for System Server and daemons. chown radio system /sys/android_power/state chown radio system /sys/android_power/request_state chown radio system /sys/android_power/acquire_full_wake_lock chown radio system /sys/android_power/acquire_partial_wake_lock chown radio system /sys/android_power/release_wake_lock chown radio system /sys/power/state chown radio system /sys/power/wake_lock chown radio system /sys/power/wake_unlock chmod 0660 /sys/power/state chmod 0660 /sys/power/wake_lock chmod 0660 /sys/power/wake_unlock chown system system /sys/class/timed_output/vibrator/enable chown system system /sys/class/leds/keyboard-backlight/brightness # chown system system /sys/class/leds/lcd-backlight/brightness chown system system /sys/class/backlight/pwm-backlight/brightness chown system system /sys/class/leds/button-backlight/brightness chown system system /sys/class/leds/jogball-backlight/brightness chown system system /sys/class/leds/red/brightness chown system system /sys/class/leds/green/brightness chown system system /sys/class/leds/blue/brightness chown system system /sys/class/leds/red/device/grpfreq chown system system /sys/class/leds/red/device/grppwm chown system system /sys/class/leds/red/device/blink chown system system /sys/class/leds/red/brightness chown system system /sys/class/leds/green/brightness chown system system /sys/class/leds/blue/brightness chown system system /sys/class/leds/red/device/grpfreq chown system system /sys/class/leds/red/device/grppwm chown system system /sys/class/leds/red/device/blink chown system system /sys/class/timed_output/vibrator/enable chown system system /sys/module/sco/parameters/disable_esco chown system system /sys/kernel/ipv4/tcp_wmem_min chown system system /sys/kernel/ipv4/tcp_wmem_def chown system system /sys/kernel/ipv4/tcp_wmem_max chown system system /sys/kernel/ipv4/tcp_rmem_min chown system system /sys/kernel/ipv4/tcp_rmem_def chown system system /sys/kernel/ipv4/tcp_rmem_max chown root radio /proc/cmdline #bluetooth power up/down interface # chown bluetooth bluetooth /sys/class/rfkill/rfkill0/type # chown bluetooth bluetooth /sys/class/rfkill/rfkill0/state # chmod 0660 /sys/class/rfkill/rfkill0/state # chown bluetooth bluetooth /dev/s3c2410_serial1 chmod 0666 /dev/s3c2410_serial1 chmod 0666 /dev/s3c2410_serial2 chmod 0666 /dev/s3c2410_serial3 chmod 0666 /dev/video0 chmod 0666 /dev/s3c-jpg # Define TCP buffer sizes for various networks # ReadMin, ReadInitial, ReadMax, WriteMin, WriteInitial, WriteMax, setprop net.tcp.buffersize.default 4096,87380,110208,4096,16384,110208 setprop net.tcp.buffersize.wifi 4095,87380,110208,4096,16384,110208 setprop net.tcp.buffersize.umts 4094,87380,110208,4096,16384,110208 setprop net.tcp.buffersize.edge 4093,26280,35040,4096,16384,35040 setprop net.tcp.buffersize.gprs 4092,8760,11680,4096,8760,11680 setprop net.dns1 8.8.8.8 setprop net.dns2 8.8.4.4 class_start default setprop alsa.mixer.playback.master Front setprop alsa.mixer.capture.master Capture setprop alsa.mixer.playback.earpiece Master setprop alsa.mixer.capture.earpiece Capture setprop alsa.mixer.playback.headset Master setprop alsa.mixer.playback.speaker Master ## Daemon processes to be run by init. ## service console /system/bin/sh #service console /system/busybox/bin/ash console # adbd is controlled by the persist.service.adb.enable system property service adbd /sbin/adbd disabled # adbd on at boot in emulator on property:ro.kernel.qemu=1 start adbd on property:persist.service.adb.enable=1 start adbd on property:persist.service.adb.enable=0 stop adbd service servicemanager /system/bin/servicemanager user system critical onrestart restart zygote onrestart restart media service vold /system/bin/vold socket vold stream 0660 root mount service tsd /sbin/tsd service nexus /system/bin/nexus socket nexus stream 0660 root system disabled #service mountd /system/bin/mountd # socket mountd stream 0660 root mount service debuggerd /system/bin/debuggerd service udiskd /system/bin/udiskd socket udiskd stream 666 root mount service fanetworkservice /system/bin/fa-network-service socket fa-network-service stream 666 radio radio user root group radio cache inet misc audio #user radio #group radio cache inet misc audio service ril-daemon /system/bin/rild -l /system/lib/libreference-ril.so -- -d /dev/pts/0 socket rild stream 660 root radio socket rild-debug stream 660 radio system user root group radio cache inet misc audio service zygote /system/bin/app_process -Xzygote /system/bin --zygote --start-system-server socket zygote stream 666 onrestart write /sys/android_power/request_state wake onrestart write /sys/power/state on onrestart restart media service media /system/bin/mediaserver user media group system audio camera graphics inet net_bt net_bt_admin ##service bootsound /system/bin/playmp3 ## user media ## group audio ## oneshot service bootanim /system/bin/bootanimation user graphics group graphics disabled oneshot service dbus /system/bin/dbus-daemon --system --nofork socket dbus stream 660 bluetooth bluetooth user bluetooth group bluetooth net_bt_admin service wpa_supplicant /system/bin/logwrapper /system/bin/wpa_supplicant -Dwext -ieth1 -c /system/etc/wifi/wpa_supplicant.conf -dd group system wifi inet keystore disabled oneshot service dhcpcd /system/bin/logwrapper /system/bin/dhcpcd -d eth1 disabled oneshot group system dhcp on property:init.svc.wpa_supplicant=stopped stop dhcpcd service bluetoothd /system/bin/logwrapper /system/bin/bluetoothd -d -n socket bluetooth stream 660 bluetooth bluetooth socket dbus_bluetooth stream 660 bluetooth bluetooth # init.rc does not yet support applying capabilities, so run as root and # let bluetoothd drop uid to bluetooth with the right linux capabilities group bluetooth net_bt_admin misc disabled # baudrate change 115200 to 1152000(Bluetooth) service changebaudrate /system/bin/logwrapper /system/xbin/bccmd_115200 -t bcsp -d /dev/s3c2410_serial1 psset -r 0x1be 0x126e user bluetooth group bluetooth net_bt_admin disabled oneshot #service hciattach /system/bin/logwrapper /system/bin/hciattach -n -s 1152000 /dev/s3c2410_serial1 bcsp 1152000 service hciattach /system/bin/logwrapper /system/bin/hciattach -n -s 115200 /dev/s3c2410_serial1 bcsp 115200 user bluetooth group bluetooth net_bt_admin misc disabled service hfag /system/bin/sdptool add --channel=10 HFAG user bluetooth group bluetooth net_bt_admin disabled oneshot service hsag /system/bin/sdptool add --channel=11 HSAG user bluetooth group bluetooth net_bt_admin disabled oneshot service opush /system/bin/sdptool add --channel=12 OPUSH user bluetooth group bluetooth net_bt_admin disabled oneshot service pbap /system/bin/sdptool add --channel=19 PBAP user bluetooth group bluetooth net_bt_admin disabled oneshot service installd /system/bin/installd socket installd stream 600 system system ##service flash_recovery /system/etc/install-recovery.sh ## oneshot service racoon /system/bin/racoon socket racoon stream 600 system system # racoon will setuid to vpn after getting necessary resources. group net_admin disabled oneshot service mtpd /system/bin/mtpd socket mtpd stream 600 system system user vpn group vpn net_admin net_raw disabled oneshot service keystore /system/bin/keystore /data/misc/keystore user keystore group keystore socket keystore stream 666 service dumpstate /system/bin/dumpstate -s socket dumpstate stream 0660 shell log disabled oneshot
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