1//===-- Unittests for read and write --------------------------------------===//
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/stdio/remove.h"
11#include "src/unistd/close.h"
12#include "src/unistd/fsync.h"
13#include "src/unistd/read.h"
14#include "src/unistd/write.h"
15#include "test/UnitTest/ErrnoCheckingTest.h"
16#include "test/UnitTest/ErrnoSetterMatcher.h"
17#include "test/UnitTest/Test.h"
18
19#include <sys/stat.h>
20
21using LlvmLibcUniStd = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
22
23TEST_F(LlvmLibcUniStd, WriteAndReadBackTest) {
24 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
25 constexpr const char *FILENAME = "__unistd_read_write.test";
26 auto TEST_FILE = libc_make_test_file_path(FILENAME);
27
28 int write_fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU);
29 ASSERT_ERRNO_SUCCESS();
30 ASSERT_GT(write_fd, 0);
31 constexpr const char HELLO[] = "hello";
32 constexpr ssize_t HELLO_SIZE = sizeof(HELLO);
33 ASSERT_THAT(LIBC_NAMESPACE::write(write_fd, HELLO, HELLO_SIZE),
34 Succeeds(HELLO_SIZE));
35 ASSERT_THAT(LIBC_NAMESPACE::fsync(write_fd), Succeeds(0));
36 ASSERT_THAT(LIBC_NAMESPACE::close(write_fd), Succeeds(0));
37
38 int read_fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY);
39 ASSERT_ERRNO_SUCCESS();
40 ASSERT_GT(read_fd, 0);
41 char read_buf[10];
42 ASSERT_THAT(LIBC_NAMESPACE::read(read_fd, read_buf, HELLO_SIZE),
43 Succeeds(HELLO_SIZE));
44 EXPECT_STREQ(read_buf, HELLO);
45 ASSERT_THAT(LIBC_NAMESPACE::close(read_fd), Succeeds(0));
46
47 ASSERT_THAT(LIBC_NAMESPACE::remove(TEST_FILE), Succeeds(0));
48}
49
50TEST_F(LlvmLibcUniStd, WriteFails) {
51 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
52
53 EXPECT_THAT(LIBC_NAMESPACE::write(-1, "", 1), Fails<ssize_t>(EBADF));
54 EXPECT_THAT(LIBC_NAMESPACE::write(1, reinterpret_cast<const void *>(-1), 1),
55 Fails<ssize_t>(EFAULT));
56}
57
58TEST_F(LlvmLibcUniStd, ReadFails) {
59 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
60
61 EXPECT_THAT(LIBC_NAMESPACE::read(-1, nullptr, 1), Fails<ssize_t>(EBADF));
62 EXPECT_THAT(LIBC_NAMESPACE::read(0, reinterpret_cast<void *>(-1), 1),
63 Fails<ssize_t>(EFAULT));
64}
65

source code of libc/test/src/unistd/read_write_test.cpp