[Android]dump调用_安卓 dump binder 链接

dumpsys源码

使用binder进行通信

vi ./frameworks/native/cmds/dumpsys/dumpsys.cpp

#define LOG_TAG "dumpsys"

#include <utils/Log.h>

#include <binder/Parcel.h>

#include <binder/ProcessState.h>

#include <binder/IServiceManager.h>

#include <binder/TextOutput.h>

#include <utils/Vector.h>

#include <getopt.h>

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <unistd.h>

#include <sys/time.h>

using namespace android;

static int sort_func(const String16* lhs, const String16* rhs)

{

    return lhs->compare(*rhs);

}

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

{

    signal(SIGPIPE, SIG_IGN);

    sp<IServiceManager> sm = defaultServiceManager();

    fflush(stdout);

    if (sm == NULL) {

                ALOGE("Unable to get default service manager!");

        aerr << "dumpsys: Unable to get default service manager!" << endl;

        return 20;

    }

    Vector<String16> services;

    Vector<String16> args;

    bool showListOnly = false;

    if ((argc == 2) && (strcmp(argv[1], "-l") == 0)) {

        showListOnly = true;

    }

    if ((argc == 1) || showListOnly) {

        services = sm->listServices();

        services.sort(sort_func);

        args.add(String16("-a"));

    } else {

        services.add(String16(argv[1]));

        for (int i=2; i<argc; i++) {

            args.add(String16(argv[i]));

        }

    }

    const size_t N = services.size();

    if (N > 1) {

        // first print a list of the current services

        aout << "Currently running services:" << endl;

        for (size_t i=0; i<N; i++) {

            sp<IBinder> service = sm->checkService(services[i]);

            if (service != NULL) {

                aout << "  " << services[i] << endl;

            }

        }

    }

    if (showListOnly) {

        return 0;

    }

    for (size_t i=0; i<N; i++) {

        sp<IBinder> service = sm->checkService(services[i]);

        if (service != NULL) {

            if (N > 1) {

                aout << "------------------------------------------------------------"

                        "-------------------" << endl;

                aout << "DUMP OF SERVICE " << services[i] << ":" << endl;

            }

//10-10, 这里能够这样写是因为class sp {里对->进行了重载

// inline  T*      operator-> () const { return m_ptr;  }

            int err = service->dump(STDOUT_FILENO, args);

            if (err != 0) {

                aerr << "Error dumping service info: (" << strerror(err)

                        << ") " << services[i] << endl;

            }

        } else {

            aerr << "Can't find service: " << services[i] << endl;

        }

    }

    return 0;

}

 发起调用

android/frameworks/native/libs/binder

vi BpBinder.cpp

status_t BpBinder::dump(int fd, const Vector<String16>& args)

{

    Parcel send;

    Parcel reply;

    send.writeFileDescriptor(fd);

    const size_t numArgs = args.size();

    send.writeInt32(numArgs);

    for (size_t i = 0; i < numArgs; i++) {

        send.writeString16(args[i]);

    }

    status_t err = transact(DUMP_TRANSACTION, send, &reply);

    return err;

}