Open source system call tests.

PiperOrigin-RevId: 224886231
Change-Id: I0fccb4d994601739d8b16b1d4e6b31f40297fb22

1 files changed, 57 insertions, 0 deletions

diff --git a/test/syscalls/linux/creat.cc b/test/syscalls/linux/creat.cc
new file mode 100644
index 000000000..72a016b4c
--- /dev/null
+++ b/test/syscalls/linux/creat.cc
@@ -0,0 +1,57 @@
+// 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 <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <string>
+
+#include "gtest/gtest.h"
+#include "test/util/fs_util.h"
+#include "test/util/temp_path.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+constexpr int kMode = 0666;
+
+TEST(CreatTest, CreatCreatesNewFile) {
+  std::string const path = NewTempAbsPath();
+  struct stat buf;
+  int fd;
+  ASSERT_THAT(stat(path.c_str(), &buf), SyscallFailsWithErrno(ENOENT));
+  ASSERT_THAT(fd = creat(path.c_str(), kMode), SyscallSucceeds());
+  EXPECT_THAT(close(fd), SyscallSucceeds());
+  EXPECT_THAT(stat(path.c_str(), &buf), SyscallSucceeds());
+}
+
+TEST(CreatTest, CreatTruncatesExistingFile) {
+  auto temp_path = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
+  int fd;
+  ASSERT_NO_ERRNO(SetContents(temp_path.path(), "non-empty"));
+  ASSERT_THAT(fd = creat(temp_path.path().c_str(), kMode), SyscallSucceeds());
+  EXPECT_THAT(close(fd), SyscallSucceeds());
+  std::string new_contents;
+  ASSERT_NO_ERRNO(GetContents(temp_path.path(), &new_contents));
+  EXPECT_EQ("", new_contents);
+}
+
+}  // namespace
+
+}  // namespace testing
+}  // namespace gvisor