[置顶] 64位Android应用程序安装与应用程序启动分析
一、Android应用程序安装到PackageManagerService过程
二、Android应用程序通过ActivityManagerService启动过程
1.应用程序Activity组件启动过程分析
2.应用程序Service组件启动过程分析
3.与zygote进程交互
SystemServer进程
system 2032 1174 1616620 81100 ffffffff b59a2c84 S system_server
frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
<span style="font-size:14px;"> private final void startProcessLocked(ProcessRecord app, String hostingType,
String hostingNameStr, String abiOverride, String entryPoint, String[] entryPointArgs) {
......
Process.ProcessStartResult startResult = Process.start(entryPoint,
app.processName, uid, uid, gids, debugFlags, mountExternal,
app.info.targetSdkVersion, app.info.seinfo, requiredAbi, instructionSet,
app.info.dataDir, entryPointArgs); //ProcessRecord process
......
}</span>
frameworks/base/core/java/android/os/Process.java <span style="font-size:14px;"> public static final ProcessStartResult start(final String processClass,
final String niceName,
int uid, int gid, int[] gids,
int debugFlags, int mountExternal,
int targetSdkVersion,
String seInfo,
String abi,
String instructionSet,
String appDataDir,
String[] zygoteArgs) {
......
return startViaZygote(processClass, niceName, uid, gid, gids,
debugFlags, mountExternal, targetSdkVersion, seInfo,
abi, instructionSet, appDataDir, zygoteArgs);
......
}
private static ProcessStartResult startViaZygote(final String processClass,
final String niceName,
final int uid, final int gid,
final int[] gids,
int debugFlags, int mountExternal,
int targetSdkVersion,
String seInfo,
String abi,
String instructionSet,
String appDataDir,
String[] extraArgs)
throws ZygoteStartFailedEx {
return zygoteSendArgsAndGetResult(openZygoteSocketIfNeeded(abi), argsForZygote);
}
//public static final String ZYGOTE_SOCKET = "zygote";
private static ProcessStartResult zygoteSendArgsAndGetResult(
ZygoteState zygoteState, ArrayList<String> args)
throws ZygoteStartFailedEx {
final BufferedWriter writer = zygoteState.writer;
final DataInputStream inputStream = zygoteState.inputStream;
writer.write(Integer.toString(args.size()));
writer.newLine();
int sz = args.size();
for (int i = 0; i < sz; i++) {
String arg = args.get(i);
if (arg.indexOf('\n') >= 0) {
throw new ZygoteStartFailedEx(
"embedded newlines not allowed");
}
writer.write(arg);
writer.newLine();
}
writer.flush();
// Should there be a timeout on this?
ProcessStartResult result = new ProcessStartResult();
result.pid = inputStream.readInt();
if (result.pid < 0) {
throw new ZygoteStartFailedEx("fork() failed");
}
result.usingWrapper = inputStream.readBoolean();
return result;
}</span>
zygote进程root 1174 1 1479696 62808 ffffffff b59a22c4 S zygote64
root 1175 1 1166056 55176 ffffffff f70ae9c8 S zygote
frameworks/base/core/java/com/android/internal/os/ZygoteInit.java
<span style="font-size:14px;">//String socketName = "zygote";
public static void main(String argv[]) {
String socketName = "zygote";
registerZygoteSocket(socketName);
gc();
if (startSystemServer) {
startSystemServer(abiList, socketName);
}
runSelectLoop(abiList);
}
private static void runSelectLoop(String abiList) throws MethodAndArgsCaller {
while (true) {
gc();
done = peers.get(index).runOnce();
}
}</span>
frameworks/base/core/java/com/android/internal/os/ZygoteConnection.java<span style="font-size:14px;"> boolean runOnce() throws ZygoteInit.MethodAndArgsCaller {
pid = Zygote.forkAndSpecialize(parsedArgs.uid, parsedArgs.gid, parsedArgs.gids,
parsedArgs.debugFlags, rlimits, parsedArgs.mountExternal, parsedArgs.seInfo,
parsedArgs.niceName, fdsToClose, parsedArgs.instructionSet,
parsedArgs.appDataDir);
if (pid == 0) {
// in child
IoUtils.closeQuietly(serverPipeFd);
serverPipeFd = null;
handleChildProc(parsedArgs, descriptors, childPipeFd, newStderr);
// should never get here, the child is expected to either
// throw ZygoteInit.MethodAndArgsCaller or exec().
return true;
} else {
// in parent...pid of < 0 means failure
IoUtils.closeQuietly(childPipeFd);
childPipeFd = null;
return handleParentProc(pid, descriptors, serverPipeFd, parsedArgs);
}
}</span>
frameworks/base/core/java/com/android/internal/os/Zygote.java<span style="font-size:14px;"> public static int forkAndSpecialize(int uid, int gid, int[] gids, int debugFlags,
int[][] rlimits, int mountExternal, String seInfo, String niceName, int[] fdsToClose,
String instructionSet, String appDataDir) {
int pid = nativeForkAndSpecialize(
uid, gid, gids, debugFlags, rlimits, mountExternal, seInfo, niceName, fdsToClose,
instructionSet, appDataDir);
}</span>
frameworks/base/core/jni/com_android_internal_os_Zygote.cpp<span style="font-size:14px;">static jint com_android_internal_os_Zygote_nativeForkAndSpecialize(
JNIEnv* env, jclass, jint uid, jint gid, jintArray gids,
jint debug_flags, jobjectArray rlimits,
jint mount_external, jstring se_info, jstring se_name,
jintArray fdsToClose, jstring instructionSet, jstring appDataDir) {
return ForkAndSpecializeCommon(env, uid, gid, gids, debug_flags,
rlimits, capabilities, capabilities, mount_external, se_info,
se_name, false, fdsToClose, instructionSet, appDataDir);
}
static pid_t ForkAndSpecializeCommon(JNIEnv* env, uid_t uid, gid_t gid, jintArray javaGids,
jint debug_flags, jobjectArray javaRlimits,
jlong permittedCapabilities, jlong effectiveCapabilities,
jint mount_external,
jstring java_se_info, jstring java_se_name,
bool is_system_server, jintArray fdsToClose,
jstring instructionSet, jstring dataDir) {
pid_t pid = fork();
}</span>
4.应用程序zygote孵化
<span style="font-size:14px;"> primaryCpuAbi=null //默认64bit
secondaryCpuAbi=null
primaryCpuAbi=armeabi //32bit
secondaryCpuAbi=null
primaryCpuAbi=arm64-v8a //64bit
secondaryCpuAbi=null</span>
参考如下prop属性
shell@coconut_cq:/ # getprop ro.product.cpu.abilist
arm64-v8a,armeabi-v7a,armeabi
shell@coconut_cq:/ # getprop ro.product.cpu.abilist64
arm64-v8a
shell@coconut_cq:/ # getprop ro.product.cpu.abilist32
armeabi-v7a,armeabi