74 lines · cpp
1//===-- Unittests for ftruncate -------------------------------------------===//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/ftruncate.h"13#include "src/unistd/read.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;23using LlvmLibcFtruncateTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;24 25TEST_F(LlvmLibcFtruncateTest, CreateAndTruncate) {26 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;27 constexpr const char *FILENAME = "ftruncate.test";28 auto TEST_FILE = libc_make_test_file_path(FILENAME);29 constexpr const char WRITE_DATA[] = "hello, ftruncate";30 constexpr size_t WRITE_SIZE = sizeof(WRITE_DATA);31 char buf[WRITE_SIZE];32 33 // The test strategy is as follows:34 // 1. Create a normal file with some data in it.35 // 2. Read it to make sure what was written is actually in the file.36 // 3. Truncate to 1 byte.37 // 4. Try to read more than 1 byte and fail.38 int fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU);39 ASSERT_ERRNO_SUCCESS();40 ASSERT_GT(fd, 0);41 ASSERT_EQ(ssize_t(WRITE_SIZE),42 LIBC_NAMESPACE::write(fd, WRITE_DATA, WRITE_SIZE));43 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));44 45 fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY);46 ASSERT_ERRNO_SUCCESS();47 ASSERT_GT(fd, 0);48 ASSERT_EQ(ssize_t(WRITE_SIZE), LIBC_NAMESPACE::read(fd, buf, WRITE_SIZE));49 ASSERT_EQ(cpp::string_view(buf), cpp::string_view(WRITE_DATA));50 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));51 52 // For ftruncate operation to succeed, the file should be opened for53 // writing.54 fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY);55 ASSERT_GT(fd, 0);56 ASSERT_ERRNO_SUCCESS();57 ASSERT_THAT(LIBC_NAMESPACE::ftruncate(fd, off_t(1)), Succeeds(0));58 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));59 60 fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY);61 ASSERT_ERRNO_SUCCESS();62 ASSERT_GT(fd, 0);63 ASSERT_EQ(ssize_t(1), LIBC_NAMESPACE::read(fd, buf, WRITE_SIZE));64 ASSERT_EQ(buf[0], WRITE_DATA[0]);65 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));66 67 ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE), Succeeds(0));68}69 70TEST_F(LlvmLibcFtruncateTest, TruncateBadFD) {71 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;72 ASSERT_THAT(LIBC_NAMESPACE::ftruncate(0, off_t(1)), Fails(EINVAL));73}74