1  /* Test of fseeko() function.
       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 <stdio.h>
      20  
      21  #include <errno.h>
      22  #include <unistd.h>
      23  
      24  #include "macros.h"
      25  
      26  int
      27  main (int argc, char **argv)
      28  {
      29    const char *filename = argv[1];
      30  
      31    /* Test that fseeko() sets errno if someone else closes the stream
      32       fd behind the back of stdio.  */
      33    {
      34      FILE *fp = fopen (filename, "r");
      35      ASSERT (fp != NULL);
      36      #if !defined __ANDROID__ /* fdsan */
      37      setvbuf (fp, NULL, _IONBF, 0);
      38      ASSERT (ftell (fp) == 0);
      39      ASSERT (fseeko (fp, 0, SEEK_END) == 0);
      40      ASSERT (ftell (fp) > 0);
      41      ASSERT (close (fileno (fp)) == 0);
      42      errno = 0;
      43      ASSERT (fseeko (fp, 0, SEEK_SET) == -1);
      44      ASSERT (errno == EBADF);
      45      #endif
      46      fclose (fp);
      47    }
      48  
      49    /* Test that fseeko() sets errno if the stream was constructed with
      50       an invalid file descriptor.  */
      51    {
      52      FILE *fp = fdopen (-1, "w");
      53      if (fp != NULL)
      54        {
      55          errno = 0;
      56          ASSERT (fseeko (fp, 0, SEEK_END) == -1);
      57          ASSERT (errno == EBADF);
      58          fclose (fp);
      59        }
      60    }
      61    {
      62      FILE *fp;
      63      close (99);
      64      fp = fdopen (99, "w");
      65      if (fp != NULL)
      66        {
      67          errno = 0;
      68          ASSERT (fseeko (fp, 0, SEEK_END) == -1);
      69          ASSERT (errno == EBADF);
      70          fclose (fp);
      71        }
      72    }
      73  
      74    return 0;
      75  }