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      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 }  // namespace incidentd
     82 }  // namespace os
     83 }  // namespace android
     84 
     85 #endif  // INCIDENTD_UTIL_H
     86