zygote 进程启动

启动zygote进程

service zygote /system/bin/app_process64 -Xzygote /system/bin --zygote --start-system-server
    class main
    priority -20
    user root
    group root readproc
    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
    onrestart restart wificond
    writepid /dev/cpuset/foreground/tasks
    on nonencrypted
    class_start main
    class_start late_start

启动zygote 对应的函数名称是 class_start

 path:/system/core/init/builtins.cpp

static int do_class_start(const std::vector<std::string>& args) {
    ServiceManager::GetInstance().
        ForEachServiceInClass(args[1], [] (Service* s) { s->StartIfNotDisabled(); });
    return 0;
}

bool Service::StartIfNotDisabled() {
    if (!(flags_ & SVC_DISABLED)) {
        return Start();
    } else {
        flags_ |= SVC_DISABLED_START;
    }
    return true;
}