1  /* Test of ftello() 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 ftello() 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 (close (fileno (fp)) == 0);
      39      errno = 0;
      40      ASSERT (ftello (fp) == (off_t)-1);
      41      ASSERT (errno == EBADF);
      42      #endif
      43      fclose (fp);
      44    }
      45  
      46    /* Test that ftello() sets errno if the stream was constructed with
      47       an invalid file descriptor.  */
      48    {
      49      FILE *fp = fdopen (-1, "w");
      50      if (fp != NULL)
      51        {
      52          errno = 0;
      53          ASSERT (ftello (fp) == (off_t)-1);
      54          ASSERT (errno == EBADF);
      55          fclose (fp);
      56        }
      57    }
      58    {
      59      FILE *fp;
      60      close (99);
      61      fp = fdopen (99, "w");
      62      if (fp != NULL)
      63        {
      64          errno = 0;
      65          ASSERT (ftello (fp) == (off_t)-1);
      66          ASSERT (errno == EBADF);
      67          fclose (fp);
      68        }
      69    }
      70  
      71    return 0;
      72  }