sysdeps/unix/sysv/linux/speed.c

   1 /* `struct termios' speed frobnication functions.  Linux version.
   2 Copyright (C) 1991, 1992, 1993, 1995, 1996 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 Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 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 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #include <stddef.h>
  21 #include <errno.h>
  22 #include <termios.h>
  23
  24
  25 /* Return the output baud rate stored in *TERMIOS_P.  */
  26 speed_t
  27 cfgetospeed (termios_p)
  28      const struct termios *termios_p;
  29 {
  30   return termios_p->c_cflag & (CBAUD | CBAUDEX);
  31 }
  32
  33 /* Return the input baud rate stored in *TERMIOS_P.
  34    For Linux there is no difference between input and output speed.  */
  35 strong_alias (cfgetospeed, cfgetispeed);
  36
  37 /* Set the output baud rate stored in *TERMIOS_P to SPEED.  */
  38 int
  39 cfsetospeed  (termios_p, speed)
  40      struct termios *termios_p;
  41      speed_t speed;
  42 {
  43   if ((speed & ~CBAUD) != 0
  44       && (speed < B57600 || speed > B460800))
  45     {
  46       __set_errno (EINVAL);
  47       return -1;
  48     }
  49
  50   termios_p->c_cflag &= ~(CBAUD | CBAUDEX);
  51   termios_p->c_cflag |= speed;
  52
  53   return 0;
  54 }
  55
  56 /* Set the input baud rate stored in *TERMIOS_P to SPEED.
  57    For Linux there is no difference between input and output speed.  */
  58 strong_alias (cfsetospeed, cfsetispeed);