android開機(jī)啟動(dòng)流程(編輯修改稿)
2025-05-04 05:06 本頁面
【文章內(nèi)容簡介】 ch can be used to match certain kinds of events and used to cause an action to occur. The builtin supported mands are defined in device/system/init/. Commands are implementd in device/system/init/. The init program only executes five kinds of triggers: “earlyinit”, “init”, “earlyboot”, “boot”, “property:*”. Take a look at the following line in default . class_start default This line is a mand for the action corresponding to “boot” trigger. It will start all services whose class name equals to “default”. By default, if no class option is defined for a service, the service’s class name is “default”. So this line will start all the services in the order of position in the file by default. (BTW, you can start any service using start mands, if you like.) Any service is run as a forked process of init, take a look at the source code of service_start in device/system/. So according to the default , the following services will be executed step by step: console: star a shell. The source is in device/system/bin/ash. adbd: start adb daemon. The source is in device/tools/adbd. By default is disabled. servicemanager: start binder system. The source is in device/mands/binder. mountd: mount all fs defined in /system/etc/ if started, receive mands through local socket to mount any fs. The source is in device/system/bin/mountd. debuggerd: start debug system. The source is in device/system/bin/debuggerd. rild: start radio interface layer daemon. The source is in device/mands/rind. zygote: start Android Java Runtime and start system server. It’s the most important service. The source is in device/servers/app. media: start AudioFlinger, MediaPlayerService and CameraService. The source is in device/mands/mediaserver. bootsound: play the default boot sound /system/media/audio/ui/. The source is in device/mands/playmp3. dbus: start dbus daemon, it’s only used by BlueZ. The source is in device/system/Bluetooth/dbusdaemon. hcid: redirect hcid’s stdout and stderr to the Android logging system. The source is in device/system/bin/logwrapper. By default is disabled. hfag: start Bluetooth handsfree audio gateway, it’s only used by BlueZ. The source is in device/system/Bluetooth/bluezutils. By default is disabled. hsag: start Bluetooth headset audio gateway, it’s only used by BlueZ. The source is in device/system/Bluetooth/bluezutils. By default is disabled. installd: start install package daemon. The source is in device/servers/installd. flash_recovery: load /system/. The source is in device/mands/recovery/mtdutils. Zygote service does the following tasks step by step: 1. Create JAVA VM. 2. Register android native function for JAVA VM. 3. Call the main function in the JAVA class named whose source is device/java/android//android/internal/os/. a) Load ZygoteInit class b) Register zygote socket c)Load preload classes(the default file is device/java/android/preloadedclasses) d) Load preload resources e) Call Zygote::forkSystemServer (implemented in device/dalvik/vm/) to fork a new process. In the new process, call the main function in the JAVA class named , whose source is in device/java/services//android/server. i. Load 1
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