linux. fbdump命令,bugreport命令、dumpstate服务

android 5.0 源码

1、/system/core/rootdir/Init.rc

service dumpstate /system/bin/dumpstate -s     =》linux服务进程

class main

socket dumpstatestream 0660 shell log

disabled

oneshot

2、对应/framework/native/cmds/dumpstate/Dumpstate.c

int main(int argc, char *argv[]) {

......

if (getuid() != 0) {

// Old versions of the adb client would call the dumpstate command directly. Newer clients call /system/bin/bugreport instead.

// If we detect we're being called incorrectly, then exec the correct program.

return execl("/system/bin/bugreport", "/system/bin/bugreport", NULL);

}

......

dumpstate();

/* tell activity manager we're done */      =》广播通知AM，已经结束？

if (do_broadcast && use_outfile && do_fb) {

run_command(NULL, 5, "/system/bin/am", "broadcast", "--user", "0",

"-a", "android.intent.action.BUGREPORT_FINISHED",

"--es", "android.intent.extra.BUGREPORT", path,

"--es", "android.intent.extra.SCREENSHOT", screenshot_path,

"--receiver-permission", "android.permission.DUMP", NULL);

}

......

}

/* dumps the current system state to stdout */

static void dumpstate() {  ......  }

3、对应/framework/native/cmds/bugreport/Bugreport.c

说明，bugreport命令，是在dumpstate服务外面包装了一层，通过socket连接dumpstate服务。

int main(int argc, char *argv[]) {

......

/* start the dumpstate service */

property_set("ctl.start", "dumpstate");

/* socket will not be available until service starts */

for (i = 0; i < 20; i++) {

s = socket_local_client("dumpstate",

ANDROID_SOCKET_NAMESPACE_RESERVED,

SOCK_STREAM);

if (s >= 0)

break;

/* try again in 1 second */

sleep(1);

}

......

}

参考：

http://blog.youkuaiyun.com/kevinx_xu/article/details/26253969

http://blog.youkuaiyun.com/chenzhiqin20/article/details/12506227