termios/speed.c

   1 /* `struct termios' speed frobnication functions.  4.4 BSD/generic GNU version.
   2    Copyright (C) 1991-2015 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    <http://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 (termios_p)
  26      const struct termios *termios_p;
  27 {
  28   return termios_p->__ospeed;
  29 }
  30
  31 /* Return the input baud rate stored in *TERMIOS_P.  */
  32 speed_t
  33 cfgetispeed (termios_p)
  34      const struct termios *termios_p;
  35 {
  36   return termios_p->__ispeed;
  37 }
  38
  39 /* Set the output baud rate stored in *TERMIOS_P to SPEED.  */
  40 int
  41 cfsetospeed (termios_p, speed)
  42      struct termios *termios_p;
  43      speed_t speed;
  44 {
  45   if (termios_p == NULL)
  46     {
  47       __set_errno (EINVAL);
  48       return -1;
  49     }
  50
  51   termios_p->__ospeed = speed;
  52   return 0;
  53 }
  54 libc_hidden_def (cfsetospeed)
  55
  56 /* Set the input baud rate stored in *TERMIOS_P to SPEED.  */
  57 int
  58 cfsetispeed (termios_p, speed)
  59      struct termios *termios_p;
  60      speed_t speed;
  61 {
  62   if (termios_p == NULL)
  63     {
  64       __set_errno (EINVAL);
  65       return -1;
  66     }
  67
  68   termios_p->__ispeed = speed;
  69   return 0;
  70 }
  71 libc_hidden_def (cfsetispeed)