termios/speed.c

   1 /* `struct termios' speed frobnication functions.  4.4 BSD/generic GNU version.
   2    Copyright (C) 1991-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <stddef.h>
  20 #include <errno.h>
  21 #include <termios.h>
  22
  23 /* Return the output baud rate stored in *TERMIOS_P.  */
  24 speed_t
  25 cfgetospeed (const struct termios *termios_p)
  26 {
  27   return termios_p->__ospeed;
  28 }
  29
  30 /* Return the input baud rate stored in *TERMIOS_P.  */
  31 speed_t
  32 cfgetispeed (const struct termios *termios_p)
  33 {
  34   return termios_p->__ispeed;
  35 }
  36
  37 /* Set the output baud rate stored in *TERMIOS_P to SPEED.  */
  38 int
  39 cfsetospeed (struct termios *termios_p, speed_t speed)
  40 {
  41   if (termios_p == NULL)
  42     {
  43       __set_errno (EINVAL);
  44       return -1;
  45     }
  46
  47   termios_p->__ospeed = speed;
  48   return 0;
  49 }
  50 libc_hidden_def (cfsetospeed)
  51
  52 /* Set the input baud rate stored in *TERMIOS_P to SPEED.  */
  53 int
  54 cfsetispeed (struct termios *termios_p, speed_t speed)
  55 {
  56   if (termios_p == NULL)
  57     {
  58       __set_errno (EINVAL);
  59       return -1;
  60     }
  61
  62   termios_p->__ispeed = speed;
  63   return 0;
  64 }
  65 libc_hidden_def (cfsetispeed)