sysdeps/generic/tcsetattr.c

   1 /* Copyright (C) 1991, 1995, 1996 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <errno.h>
  20 #include <stddef.h>
  21 #include <termios.h>
  22
  23 static int bad_speed __P ((speed_t speed));
  24
  25 /* Set the state of FD to *TERMIOS_P.  */
  26 int
  27 tcsetattr (fd, optional_actions, termios_p)
  28      int fd;
  29      int optional_actions;
  30      const struct termios *termios_p;
  31 {
  32   if (fd < 0)
  33     {
  34       __set_errno (EBADF);
  35       return -1;
  36     }
  37   if (termios_p == NULL)
  38     {
  39       __set_errno (EINVAL);
  40       return -1;
  41     }
  42   switch (optional_actions)
  43     {
  44     case TCSANOW:
  45     case TCSADRAIN:
  46     case TCSAFLUSH:
  47       break;
  48     default:
  49       __set_errno (EINVAL);
  50       return -1;
  51     }
  52
  53   if (bad_speed(termios_p->__ospeed) ||
  54       bad_speed(termios_p->__ispeed == 0 ?
  55                 termios_p->__ospeed : termios_p->__ispeed))
  56     {
  57       __set_errno (EINVAL);
  58       return -1;
  59     }
  60
  61   __set_errno (ENOSYS);
  62   return -1;
  63 }
  64
  65
  66 /* Strychnine checking.  */
  67 static int
  68 bad_speed (speed)
  69      speed_t speed;
  70 {
  71   switch (speed)
  72     {
  73     case B0:
  74     case B50:
  75     case B75:
  76     case B110:
  77     case B134:
  78     case B150:
  79     case B200:
  80     case B300:
  81     case B600:
  82     case B1200:
  83     case B1800:
  84     case B2400:
  85     case B4800:
  86     case B9600:
  87     case B19200:
  88     case B38400:
  89       return 0;
  90     default:
  91       return 1;
  92     }
  93 }
  94
  95
  96 stub_warning (tcsetattr)
  97 #include <stub-tag.h>