public void forceStopPackage(final String packageName, int userId) { // .. 权限检查,省略 long callingId = Binder.clearCallingIdentity(); try { IPackageManager pm = AppGlobals.getPackageManager(); synchronized(this) { int[] users = userId == UserHandle.USER_ALL ? mUserController.getUsers() : new int[] { userId }; for (int user : users) { // 状态判断,省略.. int pkgUid = -1; try { pkgUid = pm.getPackageUid(packageName, MATCH_DEBUG_TRIAGED_MISSING, user); } catch (RemoteException e) { } if (pkgUid == -1) { Slog.w(TAG, "Invalid packageName: " + packageName); continue; } try { pm.setPackageStoppedState(packageName, true, user); } catch (RemoteException e) { } catch (IllegalArgumentException e) { Slog.w(TAG, "Failed trying to unstop package " + packageName + ": " + e); } if (mUserController.isUserRunning(user, 0)) { // 根据 UID 和包名杀进程 forceStopPackageLocked(packageName, pkgUid, "from pid " + callingPid); finishForceStopPackageLocked(packageName, pkgUid); } } } } finally { Binder.restoreCallingIdentity(callingId); } }
final boolean forceStopPackageLocked(String packageName, int appId, boolean callerWillRestart, boolean purgeCache, boolean doit, boolean evenPersistent, boolean uninstalling, int userId, String reason) { int i; // .. 状态判断,省略 boolean didSomething = mProcessList.killPackageProcessesLocked(packageName, appId, userId, ProcessList.INVALID_ADJ, callerWillRestart, true /* allowRestart */, doit, evenPersistent, true /* setRemoved */, packageName == null ? ("stop user " + userId) : ("stop " + packageName)); didSomething |= mAtmInternal.onForceStopPackage(packageName, doit, evenPersistent, userId); // 清理 service // 清理 broadcastreceiver // 清理 providers // 清理其他 return didSomething; }
void kill(String reason, boolean noisy) { if (!killedByAm) { Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "kill"); if (mService != null && (noisy || info.uid == mService.mCurOomAdjUid)) { mService.reportUidInfoMessageLocked(TAG, "Killing " + toShortString() + " (adj " + setAdj + "): " + reason, info.uid); } if (pid > 0) { EventLog.writeEvent(EventLogTags.AM_KILL, userId, pid, processName, setAdj, reason); Process.killProcessQuiet(pid); ProcessList.killProcessGroup(uid, pid); } else { pendingStart = false; } if (!mPersistent) { killed = true; killedByAm = true; } Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER); } }
int killProcessGroup(uid_t uid, int initialPid, int signal) { return KillProcessGroup(uid, initialPid, signal, 40 /*retries*/); }
static int KillProcessGroup(uid_t uid, int initialPid, int signal, int retries) { // 省略 int retry = retries; int processes; while ((processes = DoKillProcessGroupOnce(cgroup, uid, initialPid, signal)) > 0) { LOG(VERBOSE) << "Killed " << processes << " processes for processgroup " << initialPid; if (retry > 0) { std::this_thread::sleep_for(5ms); --retry; } else { break; } } // 省略 }
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引用:Rayman 发表于 2021-03-29 09:41 Mark..试试两年前的技术是否已经被修复了。
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