bugreport命令、dumpstate服务

最新推荐文章于 2025-02-10 14:51:53 发布

ogre2020

最新推荐文章于 2025-02-10 14:51:53 发布

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本文深入解析了Android5.0系统中dumpstate服务的工作原理及其与bugreport命令之间的关系。通过分析Init.rc文件配置和Dumpstate.c、Bugreport.c源码，详细阐述了dumpstate服务如何启动及工作流程，以及bugreport命令如何通过socket连接dumpstate服务来获取系统状态。

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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 dumpstate stream 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