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/__support/macros/config.h" 15 #include "src/errno/libc_errno.h" 16 17 #include <asm/ioctls.h> // Safe to include without the risk of name pollution. 18 #include <sys/syscall.h> // For syscall numbers 19 #include <termios.h> 20 21 namespace LIBC_NAMESPACE_DECL { 22 23 LLVM_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_DECL 64