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 #pragma once
17 
18 #ifndef INCIDENTD_UTIL_H
19 #define INCIDENTD_UTIL_H
20 
21 #include <stdarg.h>
22 #include <unistd.h>
23 
24 #include <android-base/unique_fd.h>
25 #include <utils/Errors.h>
26 
27 #include "Privacy.h"
28 
29 namespace android {
30 namespace os {
31 namespace incidentd {
32 
33 using namespace android::base;
34 
35 /**
36  * Looks up Privacy of a section in the auto-gen PRIVACY_POLICY_LIST;
37  */
38 const Privacy* get_privacy_of_section(int id);
39 
40 /**
41  * This class wraps android::base::Pipe.
42  */
43 class Fpipe {
44 public:
45     Fpipe();
46     ~Fpipe();
47 
48     bool init();
49     bool close();
50     unique_fd& readFd();
51     unique_fd& writeFd();
52 
53 private:
54     unique_fd mRead;
55     unique_fd mWrite;
56 };
57 
58 /**
59  * Forks and exec a command with two pipes, one connects stdin for input,
60  * one connects stdout for output. It returns the pid of the child.
61  * Input pipe can be NULL to indicate child process doesn't read stdin.
62  */
63 pid_t fork_execute_cmd(char* const argv[], Fpipe* input, Fpipe* output);
64 
65 /**
66  * Grabs varargs from stack and stores them in heap with NULL-terminated array.
67  */
68 const char** varargs(const char* first, va_list rest);
69 
70 /**
71  * Returns the current monotonic clock time in nanoseconds.
72  */
73 uint64_t Nanotime();
74 
75 /**
76  * Methods to wait or kill child process, return exit status code.
77  */
78 status_t kill_child(pid_t pid);
79 status_t wait_child(pid_t pid);
80 
81 status_t start_detached_thread(const function<void ()>& func);
82 
83 }  // namespace incidentd
84 }  // namespace os
85 }  // namespace android
86 
87 #endif  // INCIDENTD_UTIL_H
88