1  /* Test duplicating a file descriptor.
       2     Copyright (C) 2011-2023 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  #include <config.h>
      18  
      19  #include <unistd.h>
      20  
      21  #include "signature.h"
      22  SIGNATURE_CHECK (dup, int, (int));
      23  
      24  #include <errno.h>
      25  
      26  #include "macros.h"
      27  
      28  int
      29  main (void)
      30  {
      31    /* Test behaviour for invalid file descriptors.  */
      32    {
      33      errno = 0;
      34      ASSERT (dup (-1) == -1);
      35      ASSERT (errno == EBADF);
      36    }
      37    {
      38      close (99);
      39      errno = 0;
      40      ASSERT (dup (99) == -1);
      41      ASSERT (errno == EBADF);
      42    }
      43  
      44    return 0;
      45  }