1//===-- Unittests for fchmodat --------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "src/fcntl/open.h"
10#include "src/sys/stat/fchmodat.h"
11#include "src/unistd/close.h"
12#include "src/unistd/write.h"
13#include "test/UnitTest/ErrnoCheckingTest.h"
14#include "test/UnitTest/ErrnoSetterMatcher.h"
15#include "test/UnitTest/Test.h"
16
17#include "hdr/fcntl_macros.h"
18#include <sys/stat.h>
19
20using namespace LIBC_NAMESPACE::testing::ErrnoSetterMatcher;
21using LlvmLibcFchmodatTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
22
23TEST_F(LlvmLibcFchmodatTest, ChangeAndOpen) {
24 // The test file is initially writable. We open it for writing and ensure
25 // that it indeed can be opened for writing. Next, we close the file and
26 // make it readonly using chmod. We test that chmod actually succeeded by
27 // trying to open the file for writing and failing.
28 constexpr const char *TEST_FILE = "testdata/fchmodat.test";
29 constexpr const char *TEST_DIR = "testdata";
30 constexpr const char *TEST_FILE_BASENAME = "fchmodat.test";
31 const char WRITE_DATA[] = "fchmodat test";
32 constexpr ssize_t WRITE_SIZE = ssize_t(sizeof(WRITE_DATA));
33
34 int fd = LIBC_NAMESPACE::open(TEST_FILE, O_CREAT | O_WRONLY, S_IRWXU);
35 ASSERT_GT(fd, 0);
36 ASSERT_ERRNO_SUCCESS();
37 ASSERT_EQ(LIBC_NAMESPACE::write(fd, WRITE_DATA, sizeof(WRITE_DATA)),
38 WRITE_SIZE);
39 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
40
41 int dirfd = LIBC_NAMESPACE::open(TEST_DIR, O_DIRECTORY);
42 ASSERT_GT(dirfd, 0);
43 ASSERT_ERRNO_SUCCESS();
44
45 EXPECT_THAT(LIBC_NAMESPACE::fchmodat(dirfd, TEST_FILE_BASENAME, S_IRUSR, 0),
46 Succeeds(0));
47
48 // Opening for writing should fail.
49 EXPECT_EQ(LIBC_NAMESPACE::open(TEST_FILE, O_APPEND | O_WRONLY), -1);
50 ASSERT_ERRNO_FAILURE();
51 // But opening for reading should succeed.
52 fd = LIBC_NAMESPACE::open(TEST_FILE, O_APPEND | O_RDONLY);
53 EXPECT_GT(fd, 0);
54 ASSERT_ERRNO_SUCCESS();
55
56 EXPECT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
57 EXPECT_THAT(LIBC_NAMESPACE::fchmodat(dirfd, TEST_FILE_BASENAME, S_IRWXU, 0),
58 Succeeds(0));
59
60 EXPECT_THAT(LIBC_NAMESPACE::close(dirfd), Succeeds(0));
61}
62
63TEST_F(LlvmLibcFchmodatTest, NonExistentFile) {
64 ASSERT_THAT(
65 LIBC_NAMESPACE::fchmodat(AT_FDCWD, "non-existent-file", S_IRUSR, 0),
66 Fails(ENOENT));
67}
68

source code of libc/test/src/sys/stat/fchmodat_test.cpp