termios/tcflow.c

   1 /* Copyright (C) 1991-2016 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 (int fd, int action)
  24 {
  25   if (fd < 0)
  26     {
  27       __set_errno (EBADF);
  28       return -1;
  29     }
  30
  31   switch (action)
  32     {
  33     case TCOOFF:
  34     case TCOON:
  35     case TCIOFF:
  36     case TCION:
  37       break;
  38
  39     default:
  40       __set_errno (EINVAL);
  41       return -1;
  42     }
  43
  44   __set_errno (ENOSYS);
  45   return -1;
  46 }
  47
  48
  49 stub_warning (tcflow)