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-exception 6 // 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/errno/libc_errno.h" 15 16 #include <asm/ioctls.h> // Safe to include without the risk of name pollution. 17 #include <sys/syscall.h> // For syscall numbers 18 #include <termios.h> 19 20 namespace LIBC_NAMESPACE { 21 22 LLVM_LIBC_FUNCTION(int, tcsetattr, 23 (int fd, int actions, const struct termios *t)) { 24 struct kernel_termios kt; 25 long cmd; 26 27 switch (actions) { 28 case TCSANOW: 29 cmd = TCSETS; 30 break; 31 case TCSADRAIN: 32 cmd = TCSETSW; 33 break; 34 case TCSAFLUSH: 35 cmd = TCSETSF; 36 break; 37 default: 38 libc_errno = EINVAL; 39 return -1; 40 } 41 42 kt.c_iflag = t->c_iflag; 43 kt.c_oflag = t->c_oflag; 44 kt.c_cflag = t->c_cflag; 45 kt.c_lflag = t->c_lflag; 46 size_t nccs = KERNEL_NCCS <= NCCS ? KERNEL_NCCS : NCCS; 47 for (size_t i = 0; i < nccs; ++i) 48 kt.c_cc[i] = t->c_cc[i]; 49 if (nccs < KERNEL_NCCS) { 50 for (size_t i = nccs; i < KERNEL_NCCS; ++i) 51 kt.c_cc[i] = 0; 52 } 53 54 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_ioctl, fd, cmd, &kt); 55 if (ret < 0) { 56 libc_errno = -ret; 57 return -1; 58 } 59 return 0; 60 } 61 62 } // namespace LIBC_NAMESPACE 63