1 /*
2 * Copyright (C) 2015 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 <fstream>
18 #include <iostream>
19 #include <string>
20 #include <vector>
21
22 #include <errno.h>
23 #include <time.h>
24 #include <unistd.h>
25
26 using std::cerr;
27 using std::cout;
28 using std::endl;
29 using std::getline;
30 using std::ifstream;
31 using std::string;
32 using std::vector;
33
34 namespace {
35
ReadLines(const string & input_file_path,vector<string> * lines)36 bool ReadLines(const string& input_file_path, vector<string>* lines) {
37 ifstream watched_file(input_file_path);
38 if (!watched_file.is_open()) {
39 cerr << "Unable to open input file: " << input_file_path << endl;
40 return false;
41 }
42
43 string line;
44 while (getline(watched_file, line)) {
45 lines->push_back(line);
46 }
47 watched_file.close();
48 return true;
49 }
50
HasSentinel(const vector<string> & lines,const string & sentinel)51 bool HasSentinel(const vector<string>& lines, const string& sentinel) {
52 for (const auto& line : lines) {
53 if (line.find(sentinel) != string::npos) {
54 return true;
55 }
56 }
57 return false;
58 }
59
60 } // namespace
61
main(int argc,const char * argv[])62 int main(int argc, const char* argv[]) {
63 if (argc != 5) {
64 cerr << "Invalid usage." << endl;
65 cerr << argv[0]
66 << " <timeout in seconds>"
67 << " <input file path>"
68 << " <success sentinel>"
69 << " <failure sentinel>" << endl;
70 return -EINVAL;
71 }
72 const string timeout_as_str = argv[1];
73 const string input_file_path = argv[2];
74 const string success_sentinel = argv[3];
75 const string failure_sentinel = argv[4];
76
77 const int timeout_seconds = atoi(timeout_as_str.c_str());
78 if (timeout_seconds <= 0) {
79 cerr << "Invalid timeout value (in seconds): " << timeout_as_str << endl;
80 return -EINVAL;
81 }
82
83 int exit_code = 1;
84 const time_t start_time = time(nullptr);
85 vector<string> lines;
86 while (true) {
87 sleep(1);
88 if (time(nullptr) - start_time > timeout_seconds) {
89 cerr << "Timed out waiting for success/failure sentinel." << endl;
90 break;
91 }
92 // Ignore errors when reading lines. The file may not immediately exist
93 // because it takes the Java process some time to create it.
94 lines.clear();
95 ReadLines(input_file_path, &lines);
96
97 if (HasSentinel(lines, success_sentinel)) {
98 exit_code = 0;
99 break;
100 }
101 if (HasSentinel(lines, failure_sentinel)) {
102 break;
103 }
104 }
105
106 cout << "Found output:" << endl;
107 for (const auto& line : lines) {
108 cout << " " << line << endl;
109 }
110 return exit_code;
111 }
112