android 中的dumpsys
文章出处：https://blog.csdn.net/shift_wwx/article/details/42464293
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首先来看一下dumpsys的source code：
path：frameworks/native/cmds/dumpsys
#define LOG_TAG "dumpsys"#include
#include
#include
#include
#include
#include #include
#include
#include
#include
#include
#include 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 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 services;Vector 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 1) {// first print a list of the current servicesaout << "Currently running services:" << endl;for (size_t i=0; i service = sm->checkService(services[i]);if (service != NULL) {aout << " " << services[i] << endl;}}}if (showListOnly) {return 0;}for (size_t i=0; i 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：
SurfaceFlingeraccessibilityaccountactivityalarmandroid.security.keystoreappopsappwidgetaudiobackupbatterybatterypropregbatterystatsclipboardcommontime_managementconnectivityconsumer_ircontentcountry_detectorcpuinfodbinfodevice_policydevicestoragemonitordiskstatsdisplaydreamsdrm.drmManagerdropboxentropyethernetgfxinfohardwareimage.playerinputinput_methodiphonesubinfoismslocationlock_settingsmbox_outputmode_servicemedia.audio_flingermedia.audio_policymedia.cameramedia.playermedia_routermeminfomountnetpolicynetstatsnetwork_managementnotificationpackagepermissionphonepowerpppoeprintprocstatssamplingprofilerscheduling_policysearchsensorserviceserialservicediscoverysimphonebooksipstatusbarsubtitle_servicesystem_writetelephony.registrytextservicesuimodeupdatelockusagestatsusbuservibratorwallpaperwifiwifip2pwindow
从code中，可以看出，
else{services.add(String16(argv[1]));for (int i=2; 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
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