1  /* Copyright (C) 1994-2023 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 <hurd/fd.h>
      21  #include <hurd/term.h>
      22  
      23  /* Return 1 if FD is a terminal, 0 if not.  */
      24  int
      25  __isatty (int fd)
      26  {
      27    error_t err;
      28    mach_port_t id;
      29  
      30    err = HURD_DPORT_USE (fd, __term_getctty (port, &id));
      31    if (! err)
      32      __mach_port_deallocate (__mach_task_self (), id);
      33  
      34    return !err;
      35  }
      36  
      37  weak_alias (__isatty, isatty)