Open source system call tests.

PiperOrigin-RevId: 224886231
Change-Id: I0fccb4d994601739d8b16b1d4e6b31f40297fb22

1 files changed, 77 insertions, 0 deletions

diff --git a/test/syscalls/linux/exit.cc b/test/syscalls/linux/exit.cc
new file mode 100644
index 000000000..7246a7b3b
--- /dev/null
+++ b/test/syscalls/linux/exit.cc
@@ -0,0 +1,77 @@
+// 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