0x01 查看dumpsys支持哪些服务： adb shell dumpsys -l

列出dumpsys支持的服务名字，例如(仅列出几个，全部服务有100多个)

$ adb shell dumpsys -l

Currently running services:

accessibility

account

activity

alarm

cpuinfo

isms

location

meminfo

mount

nfc

notification

package

permission

phone

power

window

0x02 查看dump某个具体服务的用法：adb shell dumpsys -h

这个就是adb shell dumpsys -l打印出来的名字，是必须遵守大小写的。

例如， adb shell dumpsys package -h

Android4.4.2中的dumpsys package -h

$ adb shell dumpsys package -h

Package manager dump options:

[-h] [-f] [cmd] ...

-f: print details of intent filters

-h: print this help

cmd may be one of:

l[ibraries]: list known shared libraries

f[ibraries]: list device features

r[esolvers]: dump intent resolvers

perm[issions]: dump permissions

pref[erred]: print preferred package settings

preferred-xml [--full]: print preferred package settings as xml

prov[iders]: dump content providers

p[ackages]: dump installed packages

s[hared-users]: dump shared user IDs

m[essages]: print collected runtime messages

v[erifiers]: print package verifier info

: info about given package

k[eysets]: print known keysets

Android6.0.1中的dumpsys package -h

$ adb shell dumpsys package -h

Package manager dump options:

[-h] [-f] [--checkin] [cmd] ...

--checkin: dump for a checkin

-f: print details of intent filters

-h: print this help

cmd may be one of:

l[ibraries]: list known shared libraries

f[ibraries]: list device features

k[eysets]: print known keysets

r[esolvers]: dump intent resolvers

perm[issions]: dump permissions

permission [name ...]: dump declaration and use of given permission

pref[erred]: print preferred package settings

preferred-xml [--full]: print preferred package settings as xml

prov[iders]: dump content providers

p[ackages]: dump installed packages

s[hared-users]: dump shared user IDs

m[essages]: print collected runtime messages

v[erifiers]: print package verifier info

d[omain-preferred-apps]: print domains preferred apps

i[ntent-filter-verifiers]|ifv: print intent filter verifier info

version: print database version info

write: write current settings now

installs: details about install sessions

check-permission []: does pkg hold perm?

: info about given package

installs: details about install sessions

例如，adb shell dumpsys activity -h

$ adb shell dumpsys activity -h

Activity manager dump options:

[-a] [-c] [-h] [cmd] ...

cmd may be one of:

a[ctivities]: activity stack state

b[roadcasts] [PACKAGE_NAME] [history [-s]]: broadcast state

i[ntents] [PACKAGE_NAME]: pending intent state

p[rocesses] [PACKAGE_NAME]: process state

o[om]: out of memory management

prov[iders] [COMP_SPEC ...]: content provider state

provider [COMP_SPEC]: provider client-side state

s[ervices] [COMP_SPEC ...]: service state

service [COMP_SPEC]: service client-side state

package [PACKAGE_NAME]: all state related to given package

all: dump all activities

top: dump the top activity

cmd may also be a COMP_SPEC to dump activities.

COMP_SPEC may be a component name (com.foo/.myApp),

a partial substring in a component name, a

hex object identifier.

-a: include all available server state.

-c: include client state.

例如，查看某个权限：

由adb shell dumpsys package -h可知，查看权限可以用：adb shell dumpsys package permissions

这会列举出手机中所有的权限。

如果只查看某一个权限可以使用adb shell dumpsys package permission 。注意这里的permission是不带s的。如果没有此选项说明手机版本比较旧了。

0x03 附dumpsys的源码

dumpsys 的代码在frameworks/native/cmds/dumpsys/dumpsys.cpp。

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

{

signal(SIGPIPE, SIG_IGN);

sp sm = defaultServiceManager();

fflush(stdout);

Vector services;

Vector args;

bool showListOnly = false;

// 只有一个参数，即执行dumpsys -l，这时只是调用listServices()获取服务列表

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

showListOnly = true;

}

// argc == 1表示如果没有加任何参数，即只是执行dumpsys

// showListOnly表示执行dumpsys -l

// 这两种情况会获取服务列表

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

services = sm->listServices();

services.sort(sort_func);

args.add(String16("-a"));

} else {

// 如果有2个或2个以上参数，即执行dumpsys ...

// 这时被认为是服务名，即listServices()列出的名字

// 及之后的参数作为service->dump的参数

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

for (int i=2; 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

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

if (service != NULL) {

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

}

}

}

if (showListOnly) {//如果只有-l参数，则到此就返回了。

return 0;

}

// 执行到此，要么dumpsys没有参数，这时services中包含了所有的服务名，即将调用所有服务的dump()方法

// 要么dumpsys有多个参数，例如dumpsys package -h

for (size_t i=0; i

sp service = sm->checkService(services[i]); // dumpsys的第一个参数就是checkService的参数，要注意大小写。

if (service != NULL) {

if (N > 1) {

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

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

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

}

int err = service->dump(STDOUT_FILENO, args); //调用指定service的dump方法，例如ActivityManagerService的dump()或者PackageManagerService的dump()方法

if (err != 0) {

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

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

}

} else {

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

}

}

return 0;

}