1 /*
2 * Copyright 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <binder/IProcessInfoService.h>
18 #include <binder/Parcel.h>
19 #include <utils/Errors.h>
20 #include <sys/types.h>
21
22 namespace android {
23
24 // ----------------------------------------------------------------------
25
26 class BpProcessInfoService : public BpInterface<IProcessInfoService> {
27 public:
BpProcessInfoService(const sp<IBinder> & impl)28 BpProcessInfoService(const sp<IBinder>& impl)
29 : BpInterface<IProcessInfoService>(impl) {}
30
getProcessStatesFromPids(size_t length,int32_t * pids,int32_t * states)31 virtual status_t getProcessStatesFromPids(size_t length, /*in*/ int32_t* pids,
32 /*out*/ int32_t* states)
33 {
34 Parcel data, reply;
35 data.writeInterfaceToken(IProcessInfoService::getInterfaceDescriptor());
36 data.writeInt32Array(length, pids);
37 data.writeInt32(length); // write length of output array, used by java AIDL stubs
38 status_t err = remote()->transact(GET_PROCESS_STATES_FROM_PIDS, data, &reply);
39 if (err != NO_ERROR || ((err = reply.readExceptionCode()) != NO_ERROR)) {
40 return err;
41 }
42 int32_t replyLen = reply.readInt32();
43 if (static_cast<size_t>(replyLen) != length) {
44 return NOT_ENOUGH_DATA;
45 }
46 if (replyLen > 0 && (err = reply.read(states, length * sizeof(*states))) != NO_ERROR) {
47 return err;
48 }
49 return reply.readInt32();
50 }
51
52 };
53
54 IMPLEMENT_META_INTERFACE(ProcessInfoService, "android.os.IProcessInfoService");
55
56 // ----------------------------------------------------------------------
57
onTransact(uint32_t code,const Parcel & data,Parcel * reply,uint32_t flags)58 status_t BnProcessInfoService::onTransact( uint32_t code, const Parcel& data, Parcel* reply,
59 uint32_t flags) {
60 switch(code) {
61 case GET_PROCESS_STATES_FROM_PIDS: {
62 CHECK_INTERFACE(IProcessInfoService, data, reply);
63 int32_t arrayLen = data.readInt32();
64 if (arrayLen <= 0) {
65 reply->writeNoException();
66 reply->writeInt32(0);
67 reply->writeInt32(NOT_ENOUGH_DATA);
68 return NO_ERROR;
69 }
70
71 size_t len = static_cast<size_t>(arrayLen);
72 int32_t pids[len];
73 status_t res = data.read(pids, len * sizeof(*pids));
74
75 // Ignore output array length returned in the parcel here, as the states array must
76 // always be the same length as the input PIDs array.
77 int32_t states[len];
78 for (size_t i = 0; i < len; i++) states[i] = -1;
79 if (res == NO_ERROR) {
80 res = getProcessStatesFromPids(len, /*in*/ pids, /*out*/ states);
81 }
82 reply->writeNoException();
83 reply->writeInt32Array(len, states);
84 reply->writeInt32(res);
85 return NO_ERROR;
86 } break;
87 default:
88 return BBinder::onTransact(code, data, reply, flags);
89 }
90 }
91
92 // ----------------------------------------------------------------------
93
94 }; // namespace android
95