1 //===-- Unittests for truncate --------------------------------------------===//
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/__support/CPP/string_view.h"
10 #include "src/errno/libc_errno.h"
11 #include "src/fcntl/open.h"
12 #include "src/unistd/close.h"
13 #include "src/unistd/read.h"
14 #include "src/unistd/truncate.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
22 namespace cpp = LIBC_NAMESPACE::cpp;
23
TEST(LlvmLibcTruncateTest,CreateAndTruncate)24 TEST(LlvmLibcTruncateTest, CreateAndTruncate) {
25 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
26 constexpr const char *FILENAME = "truncate.test";
27 auto TEST_FILE = libc_make_test_file_path(FILENAME);
28 constexpr const char WRITE_DATA[] = "hello, truncate";
29 constexpr size_t WRITE_SIZE = sizeof(WRITE_DATA);
30 char buf[WRITE_SIZE];
31
32 // The test strategy is as follows:
33 // 1. Create a normal file with some data in it.
34 // 2. Read it to make sure what was written is actually in the file.
35 // 3. Truncate to 1 byte.
36 // 4. Try to read more than 1 byte and fail.
37 LIBC_NAMESPACE::libc_errno = 0;
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 ASSERT_THAT(LIBC_NAMESPACE::truncate(TEST_FILE, off_t(1)), Succeeds(0));
53
54 fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY);
55 ASSERT_ERRNO_SUCCESS();
56 ASSERT_GT(fd, 0);
57 ASSERT_EQ(ssize_t(1), LIBC_NAMESPACE::read(fd, buf, WRITE_SIZE));
58 ASSERT_EQ(buf[0], WRITE_DATA[0]);
59 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
60
61 ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE), Succeeds(0));
62 }
63
TEST(LlvmLibcTruncateTest,TruncateNonExistentFile)64 TEST(LlvmLibcTruncateTest, TruncateNonExistentFile) {
65 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
66 ASSERT_THAT(
67 LIBC_NAMESPACE::truncate("non-existent-dir/non-existent-file", off_t(1)),
68 Fails(ENOENT));
69 }
70