1 //===-- Linux implementation of cfsetispeed -------------------------------===// 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/cfsetispeed.h" 10 11 #include "src/__support/common.h" 12 #include "src/__support/macros/config.h" 13 #include "src/errno/libc_errno.h" 14 15 #include <termios.h> 16 17 namespace LIBC_NAMESPACE_DECL { 18 19 LLVM_LIBC_FUNCTION(int, cfsetispeed, (struct termios * t, speed_t speed)) { 20 constexpr speed_t NOT_SPEED_MASK = ~speed_t(CBAUD); 21 // A speed value is valid only if it is equal to one of the B<NN+> values. 22 if (t == nullptr || ((speed & NOT_SPEED_MASK) != 0)) { 23 libc_errno = EINVAL; 24 return -1; 25 } 26 27 t->c_cflag = (t->c_cflag & NOT_SPEED_MASK) | speed; 28 t->c_ispeed = speed; 29 return 0; 30 } 31 32 } // namespace LIBC_NAMESPACE_DECL 33