Android phones start each process in a past life

Have done before a customer apk process open Cap_net_raw permissions, in order to customers can use their own method to crawl TCP/IP packets, the Android Fork has some understanding

First this apk process is zygote fork, the permissions of the zygote process contain cap_net_raw, but the fork after the Android APK permission did a rewrite through Setcapabilities (), You only need to add this cap_net_raw permission when overriding

Here, let's introduce the process.

Fork Fork Fork

1,swapper--swapper--Swapper

--init--Init

--service~

--zygote--zygote

--APK

--Kthreadd

2, first time FORK,KERNEL/INIT/MAIN.C

Rest_init->kernel_thread ();

Second time Fork,android/system/core/init/service.cpp, parse and start init.rc

BOOL Service::start ()->fork ();

Third time Fork,android/frameworks/base/core/jni/com_android_internal_os_zygote.cpp

Static pid_t Forkandspecializecommon ()->fork ()

3, for Kthreadd,kernel to create a new process, the process will be put into kthread_create_list by the Kthreadd process created

4, say again the fork function, fork ()->clone ()->do_fork (), do_fork () completely copy the parent process, except that the child process returns PID=0, and the parent process returns the PID of the child process, which distinguishes

Android phones start each process in a past life