1//===-- Unittests for ioctl -----------------------------------------------===//
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/libc_errno.h"
10#include "src/fcntl/open.h"
11#include "src/sys/ioctl/ioctl.h"
12#include "src/unistd/close.h"
13#include "src/unistd/read.h"
14#include "src/unistd/write.h"
15
16#include "test/UnitTest/ErrnoSetterMatcher.h"
17#include "test/UnitTest/Test.h"
18
19#include "hdr/sys_stat_macros.h"
20
21#include "hdr/sys_ioctl_macros.h"
22
23using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
24
25TEST(LlvmLibcSysIoctlTest, InvalidCommandAndFIONREAD) {
26 LIBC_NAMESPACE::libc_errno = 0;
27
28 // Setup the test file
29 constexpr const char *TEST_FILE_NAME = "ioctl.test";
30 constexpr const char TEST_MSG[] = "ioctl test";
31 constexpr int TEST_MSG_SIZE = sizeof(TEST_MSG) - 1;
32 auto TEST_FILE = libc_make_test_file_path(TEST_FILE_NAME);
33 int new_test_file_fd = LIBC_NAMESPACE::open(
34 TEST_FILE, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
35 ASSERT_THAT(
36 (int)LIBC_NAMESPACE::write(new_test_file_fd, TEST_MSG, TEST_MSG_SIZE),
37 Succeeds(TEST_MSG_SIZE));
38 ASSERT_ERRNO_SUCCESS();
39 ASSERT_THAT(LIBC_NAMESPACE::close(new_test_file_fd), Succeeds(0));
40 ASSERT_ERRNO_SUCCESS();
41
42 // Reopen the file for testing
43 int fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY);
44 ASSERT_ERRNO_SUCCESS();
45 ASSERT_GT(fd, 0);
46
47 // FIONREAD reports the number of available bytes to read for the passed fd
48 // This will report the full size of the file, as we haven't read anything yet
49 int n = -1;
50 int ret = LIBC_NAMESPACE::ioctl(fd, FIONREAD, &n);
51 ASSERT_ERRNO_SUCCESS();
52 ASSERT_GT(ret, -1);
53 ASSERT_EQ(n, TEST_MSG_SIZE);
54
55 // But if we read some bytes...
56 constexpr int READ_COUNT = 5;
57 char read_buffer[READ_COUNT];
58 ASSERT_THAT((int)LIBC_NAMESPACE::read(fd, read_buffer, READ_COUNT),
59 Succeeds(READ_COUNT));
60
61 // ... n should have decreased by the number of bytes we've read
62 int n_after_reading = -1;
63 ret = LIBC_NAMESPACE::ioctl(fd, FIONREAD, &n_after_reading);
64 ASSERT_ERRNO_SUCCESS();
65 ASSERT_GT(ret, -1);
66 ASSERT_EQ(n - READ_COUNT, n_after_reading);
67
68 // 0xDEADBEEF is just a random nonexistent command;
69 // calling this should always fail with ENOTTY
70 ret = LIBC_NAMESPACE::ioctl(fd, 0xDEADBEEF, NULL);
71 ASSERT_ERRNO_EQ(ENOTTY);
72 ASSERT_EQ(ret, -1);
73
74 ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
75}
76

source code of libc/test/src/sys/ioctl/linux/ioctl_test.cpp