libc/test/src/fcntl/openat_test.cpp

//===-- Unittests for openat ----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "src/fcntl/open.h"
#include "src/fcntl/openat.h"
#include "src/unistd/close.h"
#include "src/unistd/read.h"
#include "test/UnitTest/ErrnoCheckingTest.h"
#include "test/UnitTest/ErrnoSetterMatcher.h"
#include "test/UnitTest/Test.h"

#include "hdr/fcntl_macros.h"

using LlvmLibcOpenAtTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;

TEST_F(LlvmLibcOpenAtTest, OpenAndReadTest) {
  using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
  constexpr const char *TEST_DIR = "testdata";
  constexpr const char *TEST_FILE = "openat.test";
  int dir_fd = LIBC_NAMESPACE::open(TEST_DIR, O_DIRECTORY);
  ASSERT_ERRNO_SUCCESS();
  ASSERT_GT(dir_fd, 0);
  constexpr const char TEST_MSG[] = "openat test";
  constexpr ssize_t TEST_MSG_SIZE = sizeof(TEST_MSG) - 1;

  int read_fd = LIBC_NAMESPACE::openat(dir_fd, TEST_FILE, O_RDONLY);
  ASSERT_ERRNO_SUCCESS();
  ASSERT_GT(read_fd, 0);
  char read_buf[TEST_MSG_SIZE];
  ASSERT_THAT(LIBC_NAMESPACE::read(read_fd, read_buf, TEST_MSG_SIZE),
              Succeeds(TEST_MSG_SIZE));
  ASSERT_THAT(LIBC_NAMESPACE::close(read_fd), Succeeds(0));
  ASSERT_THAT(LIBC_NAMESPACE::close(dir_fd), Succeeds(0));
}

TEST_F(LlvmLibcOpenAtTest, FailTest) {
  using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
  EXPECT_THAT(LIBC_NAMESPACE::openat(AT_FDCWD, "openat.test", O_RDONLY),
              Fails(ENOENT));
}