init.rc 解析

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\xxx\out\target\product\xxx\root\init.rc

import /init.environ.rc
import /init.usb.rc
import /init.${ro.hardware}.rc
import /init.usb.configfs.rc
import /init.${ro.zygote}.rc

[ro.hardware]: [xxx]
[ro.zygote]: [zygote32]

\xxx\system\core\init\init.cpp

am.QueueEventTrigger("early-init");//触发第一个early-init类型的actions
am.QueueEventTrigger("init");
am.QueueEventTrigger("late-init");

on early-init

on early-init
    # Set init and its forked children's oom_adj.
    write /proc/1/oom_score_adj -1000
    # Disable sysrq from keyboard
    write /proc/sys/kernel/sysrq 0
    # Set the security context of /adb_keys if present.
    restorecon /adb_keys
    # Shouldn't be necessary, but sdcard won't start without it. http://b/22568628.
    mkdir /mnt 0775 root system
    # Set the security context of /postinstall if present.
    restorecon /postinstall
    start ueventd
   mount debugfs debugfs /sys/kernel/debug
   mkdir /firmware 0771 system system
   mkdir /system 0777 root root
   symlink /data/tombstones /tombstones

\xxx\out\target\product\xxx\root\init.zygote32.rc

service zygote /system/bin/app_process -Xzygote /system/bin --zygote --start-system-server
    class main
    socket zygote stream 660 root system
    onrestart write /sys/android_power/request_state wake
    onrestart write /sys/power/state on
    onrestart restart audioserver
    onrestart restart cameraserver
    onrestart restart media
    onrestart restart netd
    writepid /dev/cpuset/foreground/tasks

\xxx\frameworks\native\cmds\servicemanager\servicemanager.rc

service servicemanager /system/bin/servicemanager
    class core
    user system
    group system readproc
    critical
    onrestart restart healthd
    onrestart restart zygote
    onrestart restart audioserver
    onrestart restart media
    onrestart restart surfaceflinger
    onrestart restart inputflinger
    onrestart restart drm
    onrestart restart cameraserver
    writepid /dev/cpuset/system-background/tasks