1//===-- Unittests for pread and pwrite ------------------------------------===//
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/unistd/close.h"
11#include "src/unistd/fsync.h"
12#include "src/unistd/pread.h"
13#include "src/unistd/pwrite.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
22using LlvmLibcUniStd = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
23
24TEST_F(LlvmLibcUniStd, PWriteAndPReadBackTest) {
25 // The strategy here is that we first create a file and write to it. Next,
26 // we open that file again and write at an offset. Finally, we open the
27 // file again and pread at an offset and make sure that only expected data
28 // is being read back. This also confirms that pwrite happened successfully.
29 constexpr const char HELLO[] = "hello";
30 constexpr ssize_t HELLO_SIZE = sizeof(HELLO);
31 constexpr off_t OFFSET = 3;
32 constexpr const char OFFSET_TEXT[] = "helhello";
33 constexpr ssize_t OFFSET_TEXT_SIZE = sizeof(OFFSET_TEXT);
34
35 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
36
37 constexpr const char *FILENAME = "pread_pwrite.test";
38 auto TEST_FILE = libc_make_test_file_path(FILENAME);
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_THAT(LIBC_NAMESPACE::write(fd, HELLO, HELLO_SIZE),
43 Succeeds(HELLO_SIZE));
44 ASSERT_THAT(LIBC_NAMESPACE::fsync(fd), Succeeds(0));
45 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
46
47 fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY);
48 ASSERT_ERRNO_SUCCESS();
49 ASSERT_GT(fd, 0);
50 ASSERT_THAT(LIBC_NAMESPACE::pwrite(fd, HELLO, HELLO_SIZE, OFFSET),
51 Succeeds(HELLO_SIZE));
52 ASSERT_THAT(LIBC_NAMESPACE::fsync(fd), Succeeds(0));
53 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
54
55 fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY);
56 ASSERT_ERRNO_SUCCESS();
57 ASSERT_GT(fd, 0);
58 char read_buf[OFFSET_TEXT_SIZE];
59 ASSERT_THAT(LIBC_NAMESPACE::pread(fd, read_buf, HELLO_SIZE, OFFSET),
60 Succeeds(HELLO_SIZE));
61 EXPECT_STREQ(read_buf, HELLO);
62 ASSERT_THAT(LIBC_NAMESPACE::pread(fd, read_buf, OFFSET_TEXT_SIZE, 0),
63 Succeeds(OFFSET_TEXT_SIZE));
64 EXPECT_STREQ(read_buf, OFFSET_TEXT);
65 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
66
67 ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE), Succeeds(0));
68}
69
70TEST_F(LlvmLibcUniStd, PWriteFails) {
71 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
72 EXPECT_THAT(LIBC_NAMESPACE::pwrite(-1, "", 1, 0), Fails<ssize_t>(EBADF));
73}
74
75TEST_F(LlvmLibcUniStd, PReadFails) {
76 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
77 EXPECT_THAT(LIBC_NAMESPACE::pread(-1, nullptr, 1, 0), Fails<ssize_t>(EBADF));
78}
79

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