1  /* Test truncating a file.
       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 (ftruncate, int, (int, off_t));
      23  
      24  #include <errno.h>
      25  #include <fcntl.h>
      26  
      27  #include "macros.h"
      28  
      29  int
      30  main (int argc, char *argv[])
      31  {
      32    const char *filename = argv[1];
      33  
      34    /* Test behaviour for invalid file descriptors.  */
      35    {
      36      errno = 0;
      37      ASSERT (ftruncate (-1, 0) == -1);
      38      ASSERT (errno == EBADF);
      39    }
      40    {
      41      close (99);
      42      errno = 0;
      43      ASSERT (ftruncate (99, 0) == -1);
      44      ASSERT (errno == EBADF);
      45    }
      46  
      47    /* Test behaviour for read-only file descriptors.  */
      48    {
      49      int fd = open (filename, O_RDONLY);
      50      ASSERT (fd >= 0);
      51      errno = 0;
      52      ASSERT (ftruncate (fd, 0) == -1);
      53      ASSERT (errno == EBADF || errno == EINVAL
      54              || errno == EACCES /* seen on mingw */
      55             );
      56      close (fd);
      57    }
      58  
      59    return 0;
      60  }