1  /* Test of getdtablesize() function.
       2     Copyright (C) 2008-2022 Free Software Foundation, Inc.
       3  
       4     This program is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU General Public License as published by
       6     the Free Software Foundation, either version 3 of the License, or
       7     (at your option) any later version.
       8  
       9     This program 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
      12     GNU General Public License for more details.
      13  
      14     You should have received a copy of the GNU General Public License
      15     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  /* Written by Bruno Haible <bruno@clisp.org>, 2008.  */
      18  
      19  #include <config.h>
      20  
      21  #include <unistd.h>
      22  
      23  #include "signature.h"
      24  SIGNATURE_CHECK (getdtablesize, int, (void));
      25  
      26  #include "macros.h"
      27  
      28  int
      29  main (int argc, char *argv[])
      30  {
      31    ASSERT (getdtablesize () >= 3);
      32    ASSERT (dup2 (0, getdtablesize() - 1) == getdtablesize () - 1);
      33    ASSERT (dup2 (0, getdtablesize()) == -1);
      34  
      35    return 0;
      36  }