| 1 | //===---------- Linux implementation of the ioctl function ----------------===// |
|---|
| 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/sys/ioctl/ioctl.h" |
|---|
| 10 | |
|---|
| 11 | #include "src/__support/OSUtil/syscall.h" // For internal syscall function. |
|---|
| 12 | #include "src/__support/common.h" |
|---|
| 13 | #include "src/__support/libc_errno.h" |
|---|
| 14 | #include <stdarg.h> |
|---|
| 15 | #include <sys/syscall.h> // For syscall numbers. |
|---|
| 16 | |
|---|
| 17 | namespace LIBC_NAMESPACE_DECL { |
|---|
| 18 | |
|---|
| 19 | LLVM_LIBC_FUNCTION(int, ioctl, (int fd, unsigned long request, ...)) { |
|---|
| 20 | va_list vargs; |
|---|
| 21 | va_start(vargs, request); |
|---|
| 22 | void *data_pointer = va_arg(vargs, void *); |
|---|
| 23 | int ret = |
|---|
| 24 | LIBC_NAMESPACE::syscall_impl<int>(SYS_ioctl, fd, request, data_pointer); |
|---|
| 25 | va_end(vargs); |
|---|
| 26 | |
|---|
| 27 | // Some ioctls can be expected to return positive values |
|---|
| 28 | if (ret >= 0) |
|---|
| 29 | return ret; |
|---|
| 30 | |
|---|
| 31 | // If there is an error, errno is set and -1 is returned. |
|---|
| 32 | libc_errno = -ret; |
|---|
| 33 | return -1; |
|---|
| 34 | } |
|---|
| 35 | |
|---|
| 36 | } // namespace LIBC_NAMESPACE_DECL |
|---|
| 37 | |
|---|
