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//===-- Unittests for fchmodat --------------------------------------------===//
//
// 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/sys/stat/fchmodat.h"
#include "src/unistd/close.h"
#include "src/unistd/write.h"
#include "test/UnitTest/ErrnoSetterMatcher.h"
#include "test/UnitTest/Test.h"
#include <fcntl.h>
#include <sys/stat.h>
TEST(LlvmLibcFchmodatTest, ChangeAndOpen) {
using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
// The test file is initially writable. We open it for writing and ensure
// that it indeed can be opened for writing. Next, we close the file and
// make it readonly using chmod. We test that chmod actually succeeded by
// trying to open the file for writing and failing.
constexpr const char *TEST_FILE = "testdata/fchmodat.test";
constexpr const char *TEST_DIR = "testdata";
constexpr const char *TEST_FILE_BASENAME = "fchmodat.test";
const char WRITE_DATA[] = "fchmodat test";
constexpr ssize_t WRITE_SIZE = ssize_t(sizeof(WRITE_DATA));
libc_errno = 0;
int fd = LIBC_NAMESPACE::open(TEST_FILE, O_CREAT | O_WRONLY, S_IRWXU);
ASSERT_GT(fd, 0);
ASSERT_EQ(libc_errno, 0);
ASSERT_EQ(LIBC_NAMESPACE::write(fd, WRITE_DATA, sizeof(WRITE_DATA)),
WRITE_SIZE);
ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
int dirfd = LIBC_NAMESPACE::open(TEST_DIR, O_DIRECTORY);
ASSERT_GT(dirfd, 0);
ASSERT_EQ(libc_errno, 0);
EXPECT_THAT(LIBC_NAMESPACE::fchmodat(dirfd, TEST_FILE_BASENAME, S_IRUSR, 0),
Succeeds(0));
// Opening for writing should fail.
EXPECT_EQ(LIBC_NAMESPACE::open(TEST_FILE, O_APPEND | O_WRONLY), -1);
EXPECT_NE(libc_errno, 0);
libc_errno = 0;
// But opening for reading should succeed.
fd = LIBC_NAMESPACE::open(TEST_FILE, O_APPEND | O_RDONLY);
EXPECT_GT(fd, 0);
EXPECT_EQ(libc_errno, 0);
EXPECT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
EXPECT_THAT(LIBC_NAMESPACE::fchmodat(dirfd, TEST_FILE_BASENAME, S_IRWXU, 0),
Succeeds(0));
EXPECT_THAT(LIBC_NAMESPACE::close(dirfd), Succeeds(0));
}
TEST(LlvmLibcFchmodatTest, NonExistentFile) {
libc_errno = 0;
using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
ASSERT_THAT(
LIBC_NAMESPACE::fchmodat(AT_FDCWD, "non-existent-file", S_IRUSR, 0),
Fails(ENOENT));
libc_errno = 0;
}
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