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//===-- Unittests for pread and pwrite ------------------------------------===//
//
// 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/unistd/close.h"
#include "src/unistd/fsync.h"
#include "src/unistd/pread.h"
#include "src/unistd/pwrite.h"
#include "src/unistd/unlink.h"
#include "src/unistd/write.h"
#include "test/UnitTest/ErrnoCheckingTest.h"
#include "test/UnitTest/ErrnoSetterMatcher.h"
#include "test/UnitTest/Test.h"
#include <sys/stat.h>
using LlvmLibcUniStd = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
TEST_F(LlvmLibcUniStd, PWriteAndPReadBackTest) {
// The strategy here is that we first create a file and write to it. Next,
// we open that file again and write at an offset. Finally, we open the
// file again and pread at an offset and make sure that only expected data
// is being read back. This also confirms that pwrite happened successfully.
constexpr const char HELLO[] = "hello";
constexpr ssize_t HELLO_SIZE = sizeof(HELLO);
constexpr off_t OFFSET = 3;
constexpr const char OFFSET_TEXT[] = "helhello";
constexpr ssize_t OFFSET_TEXT_SIZE = sizeof(OFFSET_TEXT);
using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
constexpr const char *FILENAME = "pread_pwrite.test";
auto TEST_FILE = libc_make_test_file_path(FILENAME);
int fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU);
ASSERT_ERRNO_SUCCESS();
ASSERT_GT(fd, 0);
ASSERT_THAT(LIBC_NAMESPACE::write(fd, HELLO, HELLO_SIZE),
Succeeds(HELLO_SIZE));
ASSERT_THAT(LIBC_NAMESPACE::fsync(fd), Succeeds(0));
ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY);
ASSERT_ERRNO_SUCCESS();
ASSERT_GT(fd, 0);
ASSERT_THAT(LIBC_NAMESPACE::pwrite(fd, HELLO, HELLO_SIZE, OFFSET),
Succeeds(HELLO_SIZE));
ASSERT_THAT(LIBC_NAMESPACE::fsync(fd), Succeeds(0));
ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY);
ASSERT_ERRNO_SUCCESS();
ASSERT_GT(fd, 0);
char read_buf[OFFSET_TEXT_SIZE];
ASSERT_THAT(LIBC_NAMESPACE::pread(fd, read_buf, HELLO_SIZE, OFFSET),
Succeeds(HELLO_SIZE));
EXPECT_STREQ(read_buf, HELLO);
ASSERT_THAT(LIBC_NAMESPACE::pread(fd, read_buf, OFFSET_TEXT_SIZE, 0),
Succeeds(OFFSET_TEXT_SIZE));
EXPECT_STREQ(read_buf, OFFSET_TEXT);
ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE), Succeeds(0));
}
TEST_F(LlvmLibcUniStd, PWriteFails) {
using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
EXPECT_THAT(LIBC_NAMESPACE::pwrite(-1, "", 1, 0), Fails<ssize_t>(EBADF));
}
TEST_F(LlvmLibcUniStd, PReadFails) {
using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
EXPECT_THAT(LIBC_NAMESPACE::pread(-1, nullptr, 1, 0), Fails<ssize_t>(EBADF));
}
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