android 中的dumpsys
文章出处：http://blog.csdn.net/shift_wwx
请转载的朋友标明出处~~
首先来看一下dumpsys的source code：
path：frameworks/native/cmds/dumpsys
#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 {
if((argc == 2) && 0 == strcmp(argv[1], "list")){
services = sm->listServices();
services.sort(sort_func);
const size_t N = services.size();
aout << "Currently running services:" << endl;
for (size_t i=0; i<N; i++) {
aout << " " << services[i] << endl;
}
return 0;
}
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;
}
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;
}
从code中可以看到对参数的要求：
1. 当没有参数的时候会，list出所有的services，然后dump出来信息
2. 当参数是-l 或者是list的时候，只会list出所有的services
3. 当参数后面是service name的时候，会dump出service的信息
dumpsys -l：
SurfaceFlinger accessibility account activity alarm android.security.keystore appops appwidget audio backup battery batterypropreg batterystats clipboard commontime_management connectivity consumer_ir content country_detector cpuinfo dbinfo device_policy devicestoragemonitor diskstats display dreams drm.drmManager dropbox entropy ethernet gfxinfo hardware image.player input input_method iphonesubinfo isms location lock_settings mbox_outputmode_service media.audio_flinger media.audio_policy media.camera media.player media_router meminfo mount netpolicy netstats network_management notification package permission phone power pppoe print procstats samplingprofiler scheduling_policy search sensorservice serial servicediscovery simphonebook sip statusbar subtitle_service system_write telephony.registry textservices uimode updatelock usagestats usb user vibrator wallpaper wifi wifip2p window
从code中，可以看出，
else{
services.add(String16(argv[1]));
for (int i=2; i<argc; i++) {
args.add(String16(argv[i]));
}
}
将命令的第二个参数add到services，然后后面的都作为services的参数。
所以后面有点没看懂，为什么N会大于1？
最终所有的dump信息都是通过函数：
int err = service->dump(STDOUT_FILENO, args);
而这个service对象，是Ibinder类，所以其实可以看出来最终调用的是Ibinder类里面的dump函数，那么接下来就好办了。详细的binder机制，这里不再多说明。
下面来详细说明一下这个service。
1. meminfo
这个是比较常用的service，可以看一下：android 查看内存使用情况
2. cpuinfo
可以看一下：dumpsys cpuinfo
3. window
4. surfaceflinger