1 files changed, 83 insertions, 0 deletions
diff --git a/test/syscalls/linux/pwrite64.cc b/test/syscalls/linux/pwrite64.cc
new file mode 100644
index 000000000..e69794910
--- /dev/null
+++ b/test/syscalls/linux/pwrite64.cc
@@ -0,0 +1,83 @@
+// Copyright 2018 The gVisor Authors.
+//
+// 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 <errno.h>
+#include <fcntl.h>
+#include <linux/unistd.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "gtest/gtest.h"
+#include "test/util/temp_path.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+// TODO(gvisor.dev/issue/2370): This test is currently very rudimentary.
+class Pwrite64 : public ::testing::Test {
+  void SetUp() override {
+    name_ = NewTempAbsPath();
+    int fd;
+    ASSERT_THAT(fd = open(name_.c_str(), O_CREAT, 0644), SyscallSucceeds());
+    EXPECT_THAT(close(fd), SyscallSucceeds());
+  }
+
+  void TearDown() override { unlink(name_.c_str()); }
+
+ public:
+  std::string name_;
+};
+
+TEST_F(Pwrite64, AppendOnly) {
+  int fd;
+  ASSERT_THAT(fd = open(name_.c_str(), O_APPEND | O_RDWR), SyscallSucceeds());
+  constexpr int64_t kBufSize = 1024;
+  std::vector<char> buf(kBufSize);
+  std::fill(buf.begin(), buf.end(), 'a');
+  EXPECT_THAT(PwriteFd(fd, buf.data(), buf.size(), 0),
+              SyscallSucceedsWithValue(buf.size()));
+  EXPECT_THAT(lseek(fd, 0, SEEK_CUR), SyscallSucceedsWithValue(0));
+  EXPECT_THAT(close(fd), SyscallSucceeds());
+}
+
+TEST_F(Pwrite64, InvalidArgs) {
+  int fd;
+  ASSERT_THAT(fd = open(name_.c_str(), O_APPEND | O_RDWR), SyscallSucceeds());
+  constexpr int64_t kBufSize = 1024;
+  std::vector<char> buf(kBufSize);
+  std::fill(buf.begin(), buf.end(), 'a');
+  EXPECT_THAT(PwriteFd(fd, buf.data(), buf.size(), -1),
+              SyscallFailsWithErrno(EINVAL));
+  EXPECT_THAT(close(fd), SyscallSucceeds());
+}
+
+TEST_F(Pwrite64, Overflow) {
+  int fd;
+  ASSERT_THAT(fd = open(name_.c_str(), O_APPEND | O_RDWR), SyscallSucceeds());
+  constexpr int64_t kBufSize = 1024;
+  std::vector<char> buf(kBufSize);
+  std::fill(buf.begin(), buf.end(), 'a');
+  EXPECT_THAT(PwriteFd(fd, buf.data(), buf.size(), 0x7fffffffffffffffull),
+              SyscallFailsWithErrno(EINVAL));
+  EXPECT_THAT(close(fd), SyscallSucceeds());
+}
+
+}  // namespace
+
+}  // namespace testing
+}  // namespace gvisor