1 //===-- Linux implementation of cfsetospeed -------------------------------===// 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/cfsetospeed.h" 10 #include "src/errno/libc_errno.h" 11 12 #include "src/__support/common.h" 13 14 #include <termios.h> 15 16 namespace LIBC_NAMESPACE { 17 18 LLVM_LIBC_FUNCTION(int, cfsetospeed, (struct termios * t, speed_t speed)) { 19 constexpr speed_t NOT_SPEED_MASK = ~speed_t(CBAUD); 20 // A speed value is valid only if it is equal to one of the B<NN+> values. 21 if (t == nullptr || ((speed & NOT_SPEED_MASK) != 0)) { 22 libc_errno = EINVAL; 23 return -1; 24 } 25 26 t->c_cflag = (t->c_cflag & NOT_SPEED_MASK) | speed; 27 t->c_ospeed = speed; 28 return 0; 29 } 30 31 } // namespace LIBC_NAMESPACE 32