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//===-- Unittests for dup -------------------------------------------------===//
//
// 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/errno/libc_errno.h"
#include "src/fcntl/open.h"
#include "src/unistd/close.h"
#include "src/unistd/dup2.h"
#include "src/unistd/read.h"
#include "src/unistd/unlink.h"
#include "src/unistd/write.h"
#include "test/UnitTest/ErrnoSetterMatcher.h"
#include "test/UnitTest/Test.h"
#include <sys/stat.h>
TEST(LlvmLibcdupTest, ReadAndWriteViaDup) {
constexpr int DUPFD = 0xD0;
LIBC_NAMESPACE::libc_errno = 0;
using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
constexpr const char *FILENAME = "dup2.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);
int dupfd = LIBC_NAMESPACE::dup2(fd, DUPFD);
ASSERT_ERRNO_SUCCESS();
ASSERT_EQ(dupfd, DUPFD);
// Write something via the dup
constexpr char WRITE_DATA[] = "Hello, dup!";
constexpr size_t WRITE_SIZE = sizeof(WRITE_DATA);
ASSERT_EQ(ssize_t(WRITE_SIZE),
LIBC_NAMESPACE::write(dupfd, WRITE_DATA, WRITE_SIZE));
ASSERT_THAT(LIBC_NAMESPACE::close(dupfd), Succeeds(0));
// Reopen the file for reading and create a dup.
fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY);
ASSERT_ERRNO_SUCCESS();
ASSERT_GT(fd, 0);
dupfd = LIBC_NAMESPACE::dup2(fd, DUPFD);
ASSERT_ERRNO_SUCCESS();
ASSERT_EQ(dupfd, DUPFD);
// Read the file content via the dup.
char buf[WRITE_SIZE];
ASSERT_THAT(LIBC_NAMESPACE::read(dupfd, buf, WRITE_SIZE),
Succeeds(WRITE_SIZE));
ASSERT_STREQ(buf, WRITE_DATA);
// Verify that duping to the same fd value succeeds.
ASSERT_THAT(LIBC_NAMESPACE::dup2(dupfd, dupfd), Succeeds(dupfd));
ASSERT_THAT(LIBC_NAMESPACE::close(dupfd), Succeeds(0));
ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE), Succeeds(0));
}
TEST(LlvmLibcdupTest, DupBadFD) {
using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
ASSERT_THAT(LIBC_NAMESPACE::dup2(-1, 123), Fails(EBADF));
}
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