subcontext.h revision c49719fc5d2cf3817f6997ce40fc2dac7d411efa 
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 _INIT_SUBCONTEXT_H
18#define _INIT_SUBCONTEXT_H
19
20#include <signal.h>
21
22#include <string>
23#include <vector>
24
25#include <android-base/unique_fd.h>
26
27#include "builtins.h"
28#include "system/core/init/subcontext.pb.h"
29
30namespace android {
31namespace init {
32
33extern const std::string kInitContext;
34extern const std::string kVendorContext;
35
36class Subcontext {
37  public:
38    Subcontext(std::string path_prefix, std::string context)
39        : path_prefix_(std::move(path_prefix)), context_(std::move(context)), pid_(0) {
40        Fork();
41    }
42
43    Result<Success> Execute(const std::vector<std::string>& args);
44    Result<std::vector<std::string>> ExpandArgs(const std::vector<std::string>& args);
45    void Restart();
46
47    const std::string& path_prefix() const { return path_prefix_; }
48    const std::string& context() const { return context_; }
49    pid_t pid() const { return pid_; }
50
51  private:
52    void Fork();
53    Result<SubcontextReply> TransmitMessage(const SubcontextCommand& subcontext_command);
54
55    std::string path_prefix_;
56    std::string context_;
57    pid_t pid_;
58    android::base::unique_fd socket_;
59};
60
61int SubcontextMain(int argc, char** argv, const KeywordFunctionMap* function_map);
62std::vector<Subcontext>* InitializeSubcontexts();
63bool SubcontextChildReap(pid_t pid);
64
65}  // namespace init
66}  // namespace android
67
68#endif
69