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/errno/libc_errno.h"
10 #include "src/fcntl/open.h"
11 #include "src/unistd/close.h"
12 #include "src/unistd/fsync.h"
13 #include "src/unistd/pread.h"
14 #include "src/unistd/pwrite.h"
15 #include "src/unistd/unlink.h"
16 #include "src/unistd/write.h"
17 #include "test/UnitTest/ErrnoSetterMatcher.h"
18 #include "test/UnitTest/Test.h"
19
20 #include <sys/stat.h>
21
TEST(LlvmLibcUniStd,PWriteAndPReadBackTest)22 TEST(LlvmLibcUniStd, PWriteAndPReadBackTest) {
23 // The strategy here is that we first create a file and write to it. Next,
24 // we open that file again and write at an offset. Finally, we open the
25 // file again and pread at an offset and make sure that only expected data
26 // is being read back. This also confirms that pwrite happened successfully.
27 constexpr const char HELLO[] = "hello";
28 constexpr int HELLO_SIZE = sizeof(HELLO);
29 constexpr off_t OFFSET = 3;
30 constexpr const char OFFSET_TEXT[] = "helhello";
31 constexpr int OFFSET_TEXT_SIZE = sizeof(OFFSET_TEXT);
32
33 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
34
35 constexpr const char *FILENAME = "pread_pwrite.test";
36 auto TEST_FILE = libc_make_test_file_path(FILENAME);
37 int fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU);
38 ASSERT_ERRNO_SUCCESS();
39 ASSERT_GT(fd, 0);
40 ASSERT_THAT(LIBC_NAMESPACE::write(fd, HELLO, HELLO_SIZE),
41 Succeeds(HELLO_SIZE));
42 ASSERT_THAT(LIBC_NAMESPACE::fsync(fd), Succeeds(0));
43 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
44
45 fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY);
46 ASSERT_ERRNO_SUCCESS();
47 ASSERT_GT(fd, 0);
48 ASSERT_THAT(LIBC_NAMESPACE::pwrite(fd, HELLO, HELLO_SIZE, OFFSET),
49 Succeeds(HELLO_SIZE));
50 ASSERT_THAT(LIBC_NAMESPACE::fsync(fd), Succeeds(0));
51 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
52
53 fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY);
54 ASSERT_ERRNO_SUCCESS();
55 ASSERT_GT(fd, 0);
56 char read_buf[OFFSET_TEXT_SIZE];
57 ASSERT_THAT(LIBC_NAMESPACE::pread(fd, read_buf, HELLO_SIZE, OFFSET),
58 Succeeds(HELLO_SIZE));
59 EXPECT_STREQ(read_buf, HELLO);
60 ASSERT_THAT(LIBC_NAMESPACE::pread(fd, read_buf, OFFSET_TEXT_SIZE, 0),
61 Succeeds(OFFSET_TEXT_SIZE));
62 EXPECT_STREQ(read_buf, OFFSET_TEXT);
63 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
64
65 ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE), Succeeds(0));
66 }
67
TEST(LlvmLibcUniStd,PWriteFails)68 TEST(LlvmLibcUniStd, PWriteFails) {
69 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
70 EXPECT_THAT(LIBC_NAMESPACE::pwrite(-1, "", 1, 0), Fails(EBADF));
71 }
72
TEST(LlvmLibcUniStd,PReadFails)73 TEST(LlvmLibcUniStd, PReadFails) {
74 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
75 EXPECT_THAT(LIBC_NAMESPACE::pread(-1, nullptr, 1, 0), Fails(EBADF));
76 }
77