71 lines · cpp
1//===-- Unittests for truncate --------------------------------------------===//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-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/__support/CPP/string_view.h"10#include "src/fcntl/open.h"11#include "src/unistd/close.h"12#include "src/unistd/read.h"13#include "src/unistd/truncate.h"14#include "src/unistd/unlink.h"15#include "src/unistd/write.h"16#include "test/UnitTest/ErrnoCheckingTest.h"17#include "test/UnitTest/ErrnoSetterMatcher.h"18#include "test/UnitTest/Test.h"19 20#include <sys/stat.h>21 22namespace cpp = LIBC_NAMESPACE::cpp;23 24using LlvmLibcTruncateTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;25 26TEST_F(LlvmLibcTruncateTest, CreateAndTruncate) {27 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;28 constexpr const char *FILENAME = "truncate.test";29 auto TEST_FILE = libc_make_test_file_path(FILENAME);30 constexpr const char WRITE_DATA[] = "hello, truncate";31 constexpr size_t WRITE_SIZE = sizeof(WRITE_DATA);32 char buf[WRITE_SIZE];33 34 // The test strategy is as follows:35 // 1. Create a normal file with some data in it.36 // 2. Read it to make sure what was written is actually in the file.37 // 3. Truncate to 1 byte.38 // 4. Try to read more than 1 byte and fail.39 int fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU);40 ASSERT_ERRNO_SUCCESS();41 ASSERT_GT(fd, 0);42 ASSERT_EQ(ssize_t(WRITE_SIZE),43 LIBC_NAMESPACE::write(fd, WRITE_DATA, WRITE_SIZE));44 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));45 46 fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY);47 ASSERT_ERRNO_SUCCESS();48 ASSERT_GT(fd, 0);49 ASSERT_EQ(ssize_t(WRITE_SIZE), LIBC_NAMESPACE::read(fd, buf, WRITE_SIZE));50 ASSERT_EQ(cpp::string_view(buf), cpp::string_view(WRITE_DATA));51 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));52 53 ASSERT_THAT(LIBC_NAMESPACE::truncate(TEST_FILE, off_t(1)), Succeeds(0));54 55 fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY);56 ASSERT_ERRNO_SUCCESS();57 ASSERT_GT(fd, 0);58 ASSERT_EQ(ssize_t(1), LIBC_NAMESPACE::read(fd, buf, WRITE_SIZE));59 ASSERT_EQ(buf[0], WRITE_DATA[0]);60 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));61 62 ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE), Succeeds(0));63}64 65TEST_F(LlvmLibcTruncateTest, TruncateNonExistentFile) {66 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;67 ASSERT_THAT(68 LIBC_NAMESPACE::truncate("non-existent-dir/non-existent-file", off_t(1)),69 Fails(ENOENT));70}71