Process.killProcess does not work

[Yong]

The Activity Manager provide a API : killBackgroundProcesses. And the AMS will call Process.killProcessQuiet to kill the process with uid system. I write a app with system uid, and call Process.kilProcess, but it doesn't work. The process is not killed.

 So how can I kill a process with system uid ?

[zhao...@gmail.com]

The app don't have no cap_kill permission. only root and system_process have it 

发自我的 iPad

在 2014年4月24日，19:50，Yong <ito...@gmail.com> 写道：

The Activity Manager provide a API : killBackgroundProcesses. And the AMS will call Process.killProcessQuiet to kill the process with uid system. I write a app with system uid, and call Process.kilProcess, but it doesn't work. The process is not killed.

 So how can I kill a process with system uid ?

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[Yong]

So why the system_process has the kill permission? 

I know the root has the permission. But the system_process is running with uid system, and the app process is spawn by zygote. 

在 2014年4月24日星期四UTC+8下午10时30分16秒，uglystone写道：

[zhao...@gmail.com]

zygote fork the system-server with the caplitity arguments but for other process，no the flag. you can see the file zygoteinit.java

发自我的 iPad

[zhao...@gmail.com]

534

/***

535	* Prepare the arguments and fork for the system server process.

536

*/

537	private static boolean startSystemServer()

538	throws MethodAndArgsCaller, RuntimeException {

539	/** Hardcoded command line to start the system server */

540	String args[] = {

541	"--setuid=1000",

542	"--setgid=1000",

543	"--setgroups=1001,1002,1003,1004,1005,1006,1007,1008,1009,1010,3001,3002,3003",

544	"--capabilities=130104352,130104352",

545	"--runtime-init",

546	"--nice-name=system_server",

547	"com.android.server.SystemServer",

548

};

发自我的 iPad

在 2014年4月28日，10:00，Yong <ito...@gmail.com> 写道：

[Yong]

Thanks. I get the key point.

在 2014年4月28日星期一UTC+8下午8时15分34秒，uglystone写道：

534

/***

535	* Prepare the arguments and fork for the system server process.

536

*/

537	private static boolean startSystemServer()

538	throws MethodAndArgsCaller, RuntimeException {

539	/** Hardcoded command line to start the system server */

540	String args[] = {

541	"--setuid=1000",

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