1  /* Copyright (C) 1991-2023 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     <https://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)