sysdeps/generic/tcsetattr.c

   1 /* Copyright (C) 1991, 1995, 1996, 2000 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 (speed_t speed);
  24
  25 /* Set the state of FD to *TERMIOS_P.  */
  26 int
  27 tcsetattr (int fd, int optional_actions, const struct termios *termios_p)
  28 {
  29   if (fd < 0)
  30     {
  31       __set_errno (EBADF);
  32       return -1;
  33     }
  34   if (termios_p == NULL)
  35     {
  36       __set_errno (EINVAL);
  37       return -1;
  38     }
  39   switch (optional_actions)
  40     {
  41     case TCSANOW:
  42     case TCSADRAIN:
  43     case TCSAFLUSH:
  44       break;
  45     default:
  46       __set_errno (EINVAL);
  47       return -1;
  48     }
  49
  50   if (bad_speed(termios_p->__ospeed) ||
  51       bad_speed(termios_p->__ispeed == 0 ?
  52                 termios_p->__ospeed : termios_p->__ispeed))
  53     {
  54       __set_errno (EINVAL);
  55       return -1;
  56     }
  57
  58   __set_errno (ENOSYS);
  59   return -1;
  60 }
  61
  62
  63 /* Strychnine checking.  */
  64 static int
  65 bad_speed (speed_t speed)
  66 {
  67   switch (speed)
  68     {
  69     case B0:
  70     case B50:
  71     case B75:
  72     case B110:
  73     case B134:
  74     case B150:
  75     case B200:
  76     case B300:
  77     case B600:
  78     case B1200:
  79     case B1800:
  80     case B2400:
  81     case B4800:
  82     case B9600:
  83     case B19200:
  84     case B38400:
  85       return 0;
  86     default:
  87       return 1;
  88     }
  89 }
  90
  91
  92 stub_warning (tcsetattr)
  93 #include <stub-tag.h>