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// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <sys/wait.h>
#include <unistd.h>
#include "gtest/gtest.h"
#include "absl/time/time.h"
#include "test/util/file_descriptor.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
namespace {
void TestExit(int code) {
pid_t pid = fork();
if (pid == 0) {
_exit(code);
}
ASSERT_THAT(pid, SyscallSucceeds());
int status;
EXPECT_THAT(RetryEINTR(waitpid)(pid, &status, 0), SyscallSucceeds());
EXPECT_TRUE(WIFEXITED(status) && WEXITSTATUS(status) == code) << status;
}
TEST(ExitTest, Success) { TestExit(0); }
TEST(ExitTest, Failure) { TestExit(1); }
// This test ensures that a process's file descriptors are closed when it calls
// exit(). In order to test this, the parent tries to read from a pipe whose
// write end is held by the child. While the read is blocking, the child exits,
// which should cause the parent to read 0 bytes due to EOF.
TEST(ExitTest, CloseFds) {
int pipe_fds[2];
ASSERT_THAT(pipe(pipe_fds), SyscallSucceeds());
FileDescriptor read_fd(pipe_fds[0]);
FileDescriptor write_fd(pipe_fds[1]);
pid_t pid = fork();
if (pid == 0) {
read_fd.reset();
SleepSafe(absl::Seconds(10));
_exit(0);
}
EXPECT_THAT(pid, SyscallSucceeds());
write_fd.reset();
char buf[10];
EXPECT_THAT(ReadFd(read_fd.get(), buf, sizeof(buf)),
SyscallSucceedsWithValue(0));
}
} // namespace
} // namespace testing
} // namespace gvisor
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