Android zygote进程启动过程

zygote启动过程中涉及到以下模块：

app_process zygote USAP socket FileDescriptor (FD) AndroidRuntime AppRuntime （定义于app_process模块，继承自AndroidRuntime。） init进程启动zygote进程： #init.zygote32_64.rc service zygote /system/bin/app_process32 -Xzygote /system/bin --zygote --start-system-server --socket-name=zygote class main priority -20 user root group root readproc reserved_disk socket zygote stream 660 root system socket usap_pool_primary stream 660 root system onrestart exec_background - system system -- /system/bin/vdc volume abort_fuse onrestart write /sys/power/state on onrestart restart audioserver onrestart restart cameraserver onrestart restart media onrestart restart netd onrestart restart wificond writepid /dev/cpuset/foreground/tasks service zygote_secondary /system/bin/app_process64 -Xzygote /system/bin --zygote --socket-name=zygote_secondary class main priority -20 user root group root readproc reserved_disk socket zygote_secondary stream 660 root system socket usap_pool_secondary stream 660 root system onrestart restart zygote writepid /dev/cpuset/foreground/tasks 一、绑定socket app_process zygote USAP socket