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1 // Copyright 2014 The Crashpad Authors. All rights reserved. | |
2 // | |
3 // Licensed under the Apache License, Version 2.0 (the "License"); | |
4 // you may not use this file except in compliance with the License. | |
5 // You may obtain a copy of the License at | |
6 // | |
7 // http://www.apache.org/licenses/LICENSE-2.0 | |
8 // | |
9 // Unless required by applicable law or agreed to in writing, software | |
10 // distributed under the License is distributed on an "AS IS" BASIS, | |
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
12 // See the License for the specific language governing permissions and | |
13 // limitations under the License. | |
14 | |
15 #include "util/test/multiprocess.h" | |
16 | |
17 #include <signal.h> | |
18 #include <stdlib.h> | |
19 #include <sys/wait.h> | |
20 #include <unistd.h> | |
21 | |
22 #include <string> | |
23 | |
24 #include "base/auto_reset.h" | |
25 #include "base/files/scoped_file.h" | |
26 #include "base/logging.h" | |
27 #include "base/memory/scoped_ptr.h" | |
28 #include "base/posix/eintr_wrapper.h" | |
29 #include "base/strings/stringprintf.h" | |
30 #include "gtest/gtest.h" | |
31 #include "util/misc/scoped_forbid_return.h" | |
32 #include "util/test/errors.h" | |
33 | |
34 namespace crashpad { | |
35 namespace test { | |
36 | |
37 namespace internal { | |
38 | |
39 struct MultiprocessInfo { | |
40 MultiprocessInfo() | |
41 : pipe_c2p_read(-1), | |
42 pipe_c2p_write(-1), | |
43 pipe_p2c_read(-1), | |
44 pipe_p2c_write(-1), | |
45 child_pid(0) {} | |
46 | |
47 base::ScopedFD pipe_c2p_read; // child to parent | |
48 base::ScopedFD pipe_c2p_write; // child to parent | |
49 base::ScopedFD pipe_p2c_read; // parent to child | |
50 base::ScopedFD pipe_p2c_write; // parent to child | |
51 pid_t child_pid; // valid only in parent | |
52 }; | |
53 | |
54 } // namespace internal | |
55 | |
56 Multiprocess::Multiprocess() | |
57 : info_(nullptr), | |
58 code_(EXIT_SUCCESS), | |
59 reason_(kTerminationNormal) { | |
60 } | |
61 | |
62 void Multiprocess::Run() { | |
63 ASSERT_EQ(nullptr, info_); | |
64 scoped_ptr<internal::MultiprocessInfo> info(new internal::MultiprocessInfo); | |
65 base::AutoReset<internal::MultiprocessInfo*> reset_info(&info_, info.get()); | |
66 | |
67 ASSERT_NO_FATAL_FAILURE(PreFork()); | |
68 | |
69 pid_t pid = fork(); | |
70 ASSERT_GE(pid, 0) << ErrnoMessage("fork"); | |
71 | |
72 if (pid > 0) { | |
73 info_->child_pid = pid; | |
74 | |
75 RunParent(); | |
76 | |
77 // Waiting for the child happens here instead of in RunParent() because even | |
78 // if RunParent() returns early due to a gtest fatal assertion failure, the | |
79 // child should still be reaped. | |
80 | |
81 // This will make the parent hang up on the child as much as would be | |
82 // visible from the child’s perspective. The child’s side of the pipe will | |
83 // be broken, the child’s remote port will become a dead name, and an | |
84 // attempt by the child to look up the service will fail. If this weren’t | |
85 // done, the child might hang while waiting for a parent that has already | |
86 // triggered a fatal assertion failure to do something. | |
87 info.reset(); | |
88 info_ = nullptr; | |
89 | |
90 int status; | |
91 pid_t wait_pid = HANDLE_EINTR(waitpid(pid, &status, 0)); | |
92 ASSERT_EQ(pid, wait_pid) << ErrnoMessage("waitpid"); | |
93 | |
94 TerminationReason reason; | |
95 int code; | |
96 std::string message; | |
97 if (WIFEXITED(status)) { | |
98 reason = kTerminationNormal; | |
99 code = WEXITSTATUS(status); | |
100 message = base::StringPrintf("Child exited with code %d, expected", code); | |
101 } else if (WIFSIGNALED(status)) { | |
102 reason = kTerminationSignal; | |
103 code = WTERMSIG(status); | |
104 message = | |
105 base::StringPrintf("Child terminated by signal %d (%s)%s, expected", | |
106 code, | |
107 strsignal(code), | |
108 WCOREDUMP(status) ? " (core dumped)" : ""); | |
109 } else { | |
110 FAIL() << "Unknown termination reason"; | |
111 } | |
112 | |
113 if (reason_ == kTerminationNormal) { | |
114 message += base::StringPrintf(" exit with code %d", code_); | |
115 } else if (reason == kTerminationSignal) { | |
116 message += base::StringPrintf(" termination by signal %d", code_); | |
117 } | |
118 | |
119 if (reason != reason_ || code != code_) { | |
120 ADD_FAILURE() << message; | |
121 } | |
122 } else { | |
123 RunChild(); | |
124 } | |
125 } | |
126 | |
127 void Multiprocess::SetExpectedChildTermination(TerminationReason reason, | |
128 int code) { | |
129 reason_ = reason; | |
130 code_ = code; | |
131 } | |
132 | |
133 Multiprocess::~Multiprocess() { | |
134 } | |
135 | |
136 void Multiprocess::PreFork() { | |
137 int pipe_fds_c2p[2]; | |
138 int rv = pipe(pipe_fds_c2p); | |
139 ASSERT_EQ(0, rv) << ErrnoMessage("pipe"); | |
140 | |
141 info_->pipe_c2p_read.reset(pipe_fds_c2p[0]); | |
142 info_->pipe_c2p_write.reset(pipe_fds_c2p[1]); | |
143 | |
144 int pipe_fds_p2c[2]; | |
145 rv = pipe(pipe_fds_p2c); | |
146 ASSERT_EQ(0, rv) << ErrnoMessage("pipe"); | |
147 | |
148 info_->pipe_p2c_read.reset(pipe_fds_p2c[0]); | |
149 info_->pipe_p2c_write.reset(pipe_fds_p2c[1]); | |
150 } | |
151 | |
152 pid_t Multiprocess::ChildPID() const { | |
153 EXPECT_NE(0, info_->child_pid); | |
154 return info_->child_pid; | |
155 } | |
156 | |
157 FileHandle Multiprocess::ReadPipeHandle() const { | |
158 int fd = info_->child_pid ? info_->pipe_c2p_read.get() | |
159 : info_->pipe_p2c_read.get(); | |
160 CHECK_NE(fd, -1); | |
161 return fd; | |
162 } | |
163 | |
164 FileHandle Multiprocess::WritePipeHandle() const { | |
165 int fd = info_->child_pid ? info_->pipe_p2c_write.get() | |
166 : info_->pipe_c2p_write.get(); | |
167 CHECK_NE(fd, -1); | |
168 return fd; | |
169 } | |
170 | |
171 void Multiprocess::CloseReadPipe() { | |
172 if (info_->child_pid) { | |
173 info_->pipe_c2p_read.reset(); | |
174 } else { | |
175 info_->pipe_p2c_read.reset(); | |
176 } | |
177 } | |
178 | |
179 void Multiprocess::CloseWritePipe() { | |
180 if (info_->child_pid) { | |
181 info_->pipe_p2c_write.reset(); | |
182 } else { | |
183 info_->pipe_c2p_write.reset(); | |
184 } | |
185 } | |
186 | |
187 void Multiprocess::RunParent() { | |
188 // The parent uses the read end of c2p and the write end of p2c. | |
189 info_->pipe_c2p_write.reset(); | |
190 info_->pipe_p2c_read.reset(); | |
191 | |
192 MultiprocessParent(); | |
193 | |
194 info_->pipe_c2p_read.reset(); | |
195 info_->pipe_p2c_write.reset(); | |
196 } | |
197 | |
198 void Multiprocess::RunChild() { | |
199 ScopedForbidReturn forbid_return; | |
200 | |
201 // The child uses the write end of c2p and the read end of p2c. | |
202 info_->pipe_c2p_read.reset(); | |
203 info_->pipe_p2c_write.reset(); | |
204 | |
205 MultiprocessChild(); | |
206 | |
207 info_->pipe_c2p_write.reset(); | |
208 info_->pipe_p2c_read.reset(); | |
209 | |
210 if (testing::Test::HasFailure()) { | |
211 // Trigger the ScopedForbidReturn destructor. | |
212 return; | |
213 } | |
214 | |
215 // In a forked child, exit() is unsafe. Use _exit() instead. | |
216 _exit(EXIT_SUCCESS); | |
217 } | |
218 | |
219 } // namespace test | |
220 } // namespace crashpad | |
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