1 /*
2 * Copyright (C) 2020 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 "ServiceDescriptor.h"
18
19 #include <array>
20 #include <memory>
21
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25
ServiceDescriptor(std::string name,std::string cmd)26 ServiceDescriptor::ServiceDescriptor(std::string name, std::string cmd)
27 : mName(name), mCommandLine(cmd) {}
28
GetOutput(OutputConsumer * consumer) const29 std::optional<std::string> ServiceDescriptor::GetOutput(OutputConsumer* consumer) const {
30 if (!IsAvailable()) return "service not available";
31
32 const auto cmd = command();
33
34 int commandExitStatus = 0;
35 auto pipeStreamDeleter = [&commandExitStatus](std::FILE* fp) {
36 commandExitStatus = pclose(fp);
37 };
38 std::unique_ptr<std::FILE, decltype(pipeStreamDeleter)> pipeStream(popen(cmd, "r"),
39 pipeStreamDeleter);
40
41 if (!pipeStream) {
42 return std::string("Failed to execute ") + cmd + ", " + strerror(errno);
43 }
44
45 std::array<char, 65536> buffer;
46 while (!std::feof(pipeStream.get())) {
47 auto readLen = fread(buffer.data(), 1, buffer.size(), pipeStream.get());
48 consumer->Write(buffer.data(), readLen);
49 }
50
51 pipeStream.reset();
52
53 if (commandExitStatus == 0) {
54 return std::nullopt;
55 } else if (commandExitStatus < 0) {
56 return std::string("Failed when pclose ") + cmd + ", " + strerror(errno);
57 } else {
58 return std::string("Error when executing ") + cmd +
59 ", exit code: " + std::to_string(commandExitStatus);
60 }
61 }
62