termios/tcflow.c

   1 /* Copyright (C) 1991, 1995, 1996, 1997 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <termios.h>
  20
  21 /* Suspend or restart transmission on FD.  */
  22 int
  23 tcflow (fd, action)
  24      int fd;
  25      int action;
  26 {
  27   if (fd < 0)
  28     {
  29       __set_errno (EBADF);
  30       return -1;
  31     }
  32
  33   switch (action)
  34     {
  35     case TCOOFF:
  36     case TCOON:
  37     case TCIOFF:
  38     case TCION:
  39       break;
  40
  41     default:
  42       __set_errno (EINVAL);
  43       return -1;
  44     }
  45
  46   __set_errno (ENOSYS);
  47   return -1;
  48 }
  49
  50
  51 stub_warning (tcflow)