1 //===-- Unittests for fchmod ----------------------------------------------===// 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/errno/libc_errno.h" 10 #include "src/fcntl/open.h" 11 #include "src/sys/stat/fchmod.h" 12 #include "src/unistd/close.h" 13 #include "src/unistd/write.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 20 TEST(LlvmLibcChmodTest, ChangeAndOpen) { 21 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails; 22 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds; 23 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/fchmod.test"; 29 const char WRITE_DATA[] = "test data"; 30 constexpr ssize_t WRITE_SIZE = ssize_t(sizeof(WRITE_DATA)); 31 LIBC_NAMESPACE::libc_errno = 0; 32 33 int fd = LIBC_NAMESPACE::open(TEST_FILE, O_APPEND | O_WRONLY); 34 ASSERT_GT(fd, 0); 35 ASSERT_ERRNO_SUCCESS(); 36 ASSERT_EQ(LIBC_NAMESPACE::write(fd, WRITE_DATA, sizeof(WRITE_DATA)), 37 WRITE_SIZE); 38 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0)); 39 40 fd = LIBC_NAMESPACE::open(TEST_FILE, O_APPEND | O_WRONLY); 41 ASSERT_GT(fd, 0); 42 ASSERT_ERRNO_SUCCESS(); 43 EXPECT_THAT(LIBC_NAMESPACE::fchmod(fd, S_IRUSR), Succeeds(0)); 44 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0)); 45 46 // Opening for writing should fail. 47 EXPECT_EQ(LIBC_NAMESPACE::open(TEST_FILE, O_APPEND | O_WRONLY), -1); 48 ASSERT_ERRNO_FAILURE(); 49 LIBC_NAMESPACE::libc_errno = 0; 50 // But opening for reading should succeed. 51 fd = LIBC_NAMESPACE::open(TEST_FILE, O_APPEND | O_RDONLY); 52 EXPECT_GT(fd, 0); 53 ASSERT_ERRNO_SUCCESS(); 54 55 EXPECT_THAT(LIBC_NAMESPACE::fchmod(fd, S_IRWXU), Succeeds(0)); 56 EXPECT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0)); 57 } 58 59 TEST(LlvmLibcChmodTest, NonExistentFile) { 60 LIBC_NAMESPACE::libc_errno = 0; 61 ASSERT_EQ(LIBC_NAMESPACE::fchmod(-1, S_IRUSR), -1); 62 ASSERT_ERRNO_FAILURE(); 63 LIBC_NAMESPACE::libc_errno = 0; 64 } 65