64 lines · cpp
1//===-- Linux implementation of tcsetattr ---------------------------------===//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-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/termios/tcsetattr.h"10#include "kernel_termios.h"11 12#include "src/__support/OSUtil/syscall.h"13#include "src/__support/common.h"14#include "src/__support/libc_errno.h"15#include "src/__support/macros/config.h"16 17#include <asm/ioctls.h> // Safe to include without the risk of name pollution.18#include <sys/syscall.h> // For syscall numbers19#include <termios.h>20 21namespace LIBC_NAMESPACE_DECL {22 23LLVM_LIBC_FUNCTION(int, tcsetattr,24 (int fd, int actions, const struct termios *t)) {25 struct kernel_termios kt;26 long cmd;27 28 switch (actions) {29 case TCSANOW:30 cmd = TCSETS;31 break;32 case TCSADRAIN:33 cmd = TCSETSW;34 break;35 case TCSAFLUSH:36 cmd = TCSETSF;37 break;38 default:39 libc_errno = EINVAL;40 return -1;41 }42 43 kt.c_iflag = t->c_iflag;44 kt.c_oflag = t->c_oflag;45 kt.c_cflag = t->c_cflag;46 kt.c_lflag = t->c_lflag;47 size_t nccs = KERNEL_NCCS <= NCCS ? KERNEL_NCCS : NCCS;48 for (size_t i = 0; i < nccs; ++i)49 kt.c_cc[i] = t->c_cc[i];50 if (nccs < KERNEL_NCCS) {51 for (size_t i = nccs; i < KERNEL_NCCS; ++i)52 kt.c_cc[i] = 0;53 }54 55 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_ioctl, fd, cmd, &kt);56 if (ret < 0) {57 libc_errno = -ret;58 return -1;59 }60 return 0;61}62 63} // namespace LIBC_NAMESPACE_DECL64