1//===-- Unittests for lseek -----------------------------------------------===//
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/lseek.h"
12#include "src/unistd/read.h"
13#include "test/UnitTest/ErrnoCheckingTest.h"
14#include "test/UnitTest/ErrnoSetterMatcher.h"
15#include "test/UnitTest/Test.h"
16
17#include <unistd.h>
18
19using LlvmLibcUniStd = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
20
21TEST_F(LlvmLibcUniStd, LseekTest) {
22 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
23 constexpr const char *FILENAME = "testdata/lseek.test";
24 auto TEST_FILE = libc_make_test_file_path(FILENAME);
25 int fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY);
26 ASSERT_ERRNO_SUCCESS();
27 ASSERT_GT(fd, 0);
28 constexpr const char LSEEK_TEST[] = "lseek test";
29 constexpr ssize_t LSEEK_TEST_SIZE = sizeof(LSEEK_TEST) - 1;
30
31 char read_buf[20];
32 ASSERT_THAT(LIBC_NAMESPACE::read(fd, read_buf, LSEEK_TEST_SIZE),
33 Succeeds(LSEEK_TEST_SIZE));
34 read_buf[LSEEK_TEST_SIZE] = '\0';
35 EXPECT_STREQ(read_buf, LSEEK_TEST);
36
37 // Seek to the beginning of the file and re-read.
38 ASSERT_THAT(LIBC_NAMESPACE::lseek(fd, 0, SEEK_SET), Succeeds(off_t(0)));
39 ASSERT_THAT(LIBC_NAMESPACE::read(fd, read_buf, LSEEK_TEST_SIZE),
40 Succeeds(LSEEK_TEST_SIZE));
41 read_buf[LSEEK_TEST_SIZE] = '\0';
42 EXPECT_STREQ(read_buf, LSEEK_TEST);
43
44 // Seek to the beginning of the file from the end and re-read.
45 ASSERT_THAT(LIBC_NAMESPACE::lseek(fd, -LSEEK_TEST_SIZE, SEEK_END),
46 Succeeds(off_t(0)));
47 ASSERT_THAT(LIBC_NAMESPACE::read(fd, read_buf, LSEEK_TEST_SIZE),
48 Succeeds(LSEEK_TEST_SIZE));
49 read_buf[LSEEK_TEST_SIZE] = '\0';
50 EXPECT_STREQ(read_buf, LSEEK_TEST);
51
52 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
53}
54
55TEST_F(LlvmLibcUniStd, LseekFailsTest) {
56 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
57 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
58 constexpr const char *FILENAME = "testdata/lseek.test";
59 auto TEST_FILE = libc_make_test_file_path(FILENAME);
60 int fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY);
61 ASSERT_ERRNO_SUCCESS();
62 ASSERT_GT(fd, 0);
63 EXPECT_THAT(LIBC_NAMESPACE::lseek(fd, -1, SEEK_CUR), Fails<off_t>(EINVAL));
64 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
65}
66

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