1 /*
2  * Copyright (C) 2017 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 #ifndef FRAMEWORKS_NATIVE_CMDS_LSHAL_PIPE_RELAY_H_
18 
19 #define FRAMEWORKS_NATIVE_CMDS_LSHAL_PIPE_RELAY_H_
20 
21 #include <android-base/macros.h>
22 #include <ostream>
23 #include <utils/Errors.h>
24 #include <utils/RefBase.h>
25 
26 namespace android {
27 namespace lshal {
28 
29 /* Creates an AF_UNIX socketpair and spawns a thread that relays any data
30  * written to the "write"-end of the pair to the specified output stream "os".
31  */
32 struct PipeRelay {
33     explicit PipeRelay(std::ostream &os);
34     ~PipeRelay();
35 
36     status_t initCheck() const;
37 
38     // Returns the file descriptor corresponding to the "write"-end of the
39     // connection.
40     int fd() const;
41 
42 private:
43     struct RelayThread;
44 
45     status_t mInitCheck;
46     int mFds[2];
47     sp<RelayThread> mThread;
48 
49     static void CloseFd(int *fd);
50 
51     DISALLOW_COPY_AND_ASSIGN(PipeRelay);
52 };
53 
54 }  // namespace lshal
55 }  // namespace android
56 
57 #endif  // FRAMEWORKS_NATIVE_CMDS_LSHAL_PIPE_RELAY_H_
58 
59