libc/src/termios/linux/cfsetospeed.cpp

   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/__support/macros/config.h"
  11 #include "src/errno/libc_errno.h"
  12
  13 #include "src/__support/common.h"
  14
  15 #include <termios.h>
  16
  17 namespace LIBC_NAMESPACE_DECL {
  18
  19 LLVM_LIBC_FUNCTION(int, cfsetospeed, (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_ospeed = speed;
  29   return 0;
  30 }
  31
  32 } // namespace LIBC_NAMESPACE_DECL