Android start stop命令

我们经常使用stop start命令来重启framework，我们来看下其代码

是在system/core/toolbox下面,原理很简单就是利用ctl属性来控制进程。

start.c

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
 
#include <cutils/properties.h>
 
int start_main(int argc, char *argv[])
{
    if(argc > 1) {
        property_set("ctl.start", argv[1]);
    } else {
        /* defaults to starting the common services stopped by stop.c */
        property_set("ctl.start", "netd");
        property_set("ctl.start", "surfaceflinger");
        property_set("ctl.start", "zygote");
        property_set("ctl.start", "zygote_secondary");
    }
 
    return 0;
}

stop.c

#include <stdio.h>
#include <string.h>
 
#include <cutils/properties.h>
 
int stop_main(int argc, char *argv[])
{
    if(argc > 1) {
        property_set("ctl.stop", argv[1]);
    } else{
        /* defaults to stopping the common services */
        property_set("ctl.stop", "zygote_secondary");
        property_set("ctl.stop", "zygote");
        property_set("ctl.stop", "surfaceflinger");
        property_set("ctl.stop", "netd");
    }
 
    return 0;
}

所以从上面代码看，start stop还可以启动和停止init中的service，类似我们设置ctl.start clt.stop