android 手机关机流程分析

android 手机关机流程分析。

rebootorshutdown -》lowlevelshutdown-》systemproperties.set("sys.powerctl", xxx);

在init.rc 中on property:sys.powerctl=*powerctl ${sys.powerctl}

kernel-4.4/kernel/reboot.c

syscall_define4(reboot, int, magic1, int, magic2, unsigned int, cmd, void __user *, arg){

case linux_reboot_cmd_power_off:

do_gettimeofday(&start); printk(kern_err " %14s: %lu.%03lu [sec]\n", "total time", start.tv_sec, (unsigned long) (start.tv_usec/1000)); kernel_power_off();

do_exit(0);

break;