Add ProcessInfoService to activity manager.
- Adds a new AIDL interface for querying process
information from activity manager.
Bug: 19186859
Change-Id: Ic08858f346d6b66e7bfc9da6faa2c6e38d9b2e82
diff --git a/libs/binder/IProcessInfoService.cpp b/libs/binder/IProcessInfoService.cpp
new file mode 100644
index 0000000..d86eb27
--- /dev/null
+++ b/libs/binder/IProcessInfoService.cpp
@@ -0,0 +1,94 @@
+/*
+ * Copyright 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <binder/IProcessInfoService.h>
+#include <binder/Parcel.h>
+#include <utils/Errors.h>
+#include <sys/types.h>
+
+namespace android {
+
+// ----------------------------------------------------------------------
+
+class BpProcessInfoService : public BpInterface<IProcessInfoService> {
+public:
+ BpProcessInfoService(const sp<IBinder>& impl)
+ : BpInterface<IProcessInfoService>(impl) {}
+
+ virtual status_t getProcessStatesFromPids(size_t length, /*in*/ int32_t* pids,
+ /*out*/ int32_t* states)
+ {
+ Parcel data, reply;
+ data.writeInterfaceToken(IProcessInfoService::getInterfaceDescriptor());
+ data.writeInt32Array(length, pids);
+ data.writeInt32(length); // write length of output array, used by java AIDL stubs
+ status_t err = remote()->transact(GET_PROCESS_STATES_FROM_PIDS, data, &reply);
+ if (err != NO_ERROR || ((err = reply.readExceptionCode()) != NO_ERROR)) {
+ return err;
+ }
+ int32_t replyLen = reply.readInt32();
+ if (static_cast<size_t>(replyLen) != length) {
+ return NOT_ENOUGH_DATA;
+ }
+ if (replyLen > 0 && (err = reply.read(states, length * sizeof(*states))) != NO_ERROR) {
+ return err;
+ }
+ return reply.readInt32();
+ }
+
+};
+
+IMPLEMENT_META_INTERFACE(ProcessInfoService, "android.os.IProcessInfoService");
+
+// ----------------------------------------------------------------------
+
+status_t BnProcessInfoService::onTransact( uint32_t code, const Parcel& data, Parcel* reply,
+ uint32_t flags) {
+ switch(code) {
+ case GET_PROCESS_STATES_FROM_PIDS: {
+ CHECK_INTERFACE(IProcessInfoService, data, reply);
+ int32_t arrayLen = data.readInt32();
+ if (arrayLen <= 0) {
+ reply->writeNoException();
+ reply->writeInt32(0);
+ reply->writeInt32(NOT_ENOUGH_DATA);
+ return NO_ERROR;
+ }
+
+ size_t len = static_cast<size_t>(arrayLen);
+ int32_t pids[len];
+ status_t res = data.read(pids, len * sizeof(*pids));
+
+ // Ignore output array length returned in the parcel here, as the states array must
+ // always be the same length as the input PIDs array.
+ int32_t states[len];
+ for (size_t i = 0; i < len; i++) states[i] = -1;
+ if (res == NO_ERROR) {
+ res = getProcessStatesFromPids(len, /*in*/ pids, /*out*/ states);
+ }
+ reply->writeNoException();
+ reply->writeInt32Array(len, states);
+ reply->writeInt32(res);
+ return NO_ERROR;
+ } break;
+ default:
+ return BBinder::onTransact(code, data, reply, flags);
+ }
+}
+
+// ----------------------------------------------------------------------
+
+}; // namespace android