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