| 1 | //===-- Definition of kernel's version of struct termios --------*- C++ -*-===// |
|---|---|
| 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 | #ifndef LLVM_LIBC_SRC_TERMIOS_LINUX_KERNEL_TERMIOS_H |
| 10 | #define LLVM_LIBC_SRC_TERMIOS_LINUX_KERNEL_TERMIOS_H |
| 11 | |
| 12 | #include "src/__support/macros/config.h" |
| 13 | #include <stddef.h> |
| 14 | #include <termios.h> |
| 15 | |
| 16 | namespace LIBC_NAMESPACE_DECL { |
| 17 | |
| 18 | // The kernel's struct termios is different from the libc's struct termios. The |
| 19 | // kernel's syscalls expect the size and layout of its definition of struct |
| 20 | // termios. So, we define a flavor of struct termios which matches that of the |
| 21 | // kernel so that we can translate between the libc version and the kernel |
| 22 | // version when passing struct termios objects to syscalls. |
| 23 | |
| 24 | // NOTE: The definitions here are generic definitions valid for most target |
| 25 | // architectures including x86_64 and aarch64. Definitions on some architectures |
| 26 | // deviate from these generic definitions. Adjustments have to be made for those |
| 27 | // architectures. |
| 28 | |
| 29 | constexpr size_t KERNEL_NCCS = 19; |
| 30 | |
| 31 | struct kernel_termios { |
| 32 | tcflag_t c_iflag; |
| 33 | tcflag_t c_oflag; |
| 34 | tcflag_t c_cflag; |
| 35 | tcflag_t c_lflag; |
| 36 | cc_t c_line; |
| 37 | cc_t c_cc[KERNEL_NCCS]; |
| 38 | }; |
| 39 | |
| 40 | } // namespace LIBC_NAMESPACE_DECL |
| 41 | |
| 42 | #endif // LLVM_LIBC_SRC_TERMIOS_LINUX_KERNEL_TERMIOS_H |
| 43 |