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 <unistd.h>
      20  #include <sys/types.h>
      21  
      22  /* Return the foreground process group ID of FD.  */
      23  pid_t
      24  tcgetpgrp (int fd)
      25  {
      26    if (fd < 0)
      27      {
      28        __set_errno (EBADF);
      29        return (pid_t) -1;
      30      }
      31  
      32    __set_errno (ENOSYS);
      33    return (pid_t) -1;
      34  }
      35  libc_hidden_def (tcgetpgrp)
      36  stub_warning (tcgetpgrp)