1  /* Test of fwrite() 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, or (at your option)
       7     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 "signature.h"
      22  SIGNATURE_CHECK (fwrite, size_t, (const void *, size_t, size_t, FILE *));
      23  
      24  #include <errno.h>
      25  #include <fcntl.h>
      26  #include <unistd.h>
      27  
      28  #if HAVE_MSVC_INVALID_PARAMETER_HANDLER
      29  # include "msvc-inval.h"
      30  #endif
      31  
      32  #include "macros.h"
      33  
      34  int
      35  main (int argc, char **argv)
      36  {
      37    const char *filename = "test-fwrite.txt";
      38  
      39    /* We don't have an fwrite() function that installs an invalid parameter
      40       handler so far.  So install that handler here, explicitly.  */
      41  #if HAVE_MSVC_INVALID_PARAMETER_HANDLER \
      42      && MSVC_INVALID_PARAMETER_HANDLING == DEFAULT_HANDLING
      43    gl_msvc_inval_ensure_handler ();
      44  #endif
      45  
      46    /* Test that fwrite() on an unbuffered stream sets errno if someone else
      47       closes the stream fd behind the back of stdio.  */
      48    #if !defined __ANDROID__ /* fdsan */
      49    {
      50      FILE *fp = fopen (filename, "w");
      51      char buf[5] = "world";
      52      ASSERT (fp != NULL);
      53      setvbuf (fp, NULL, _IONBF, 0);
      54      ASSERT (close (fileno (fp)) == 0);
      55      errno = 0;
      56      ASSERT (fwrite (buf, 1, sizeof (buf), fp) == 0);
      57      ASSERT (errno == EBADF);
      58      ASSERT (ferror (fp));
      59      fclose (fp);
      60    }
      61    #endif
      62  
      63    /* Test that fwrite() on an unbuffered stream sets errno if the stream
      64       was constructed with an invalid file descriptor.  */
      65    {
      66      FILE *fp = fdopen (-1, "w");
      67      if (fp != NULL)
      68        {
      69          char buf[5] = "world";
      70          setvbuf (fp, NULL, _IONBF, 0);
      71          errno = 0;
      72          ASSERT (fwrite (buf, 1, sizeof (buf), fp) == 0);
      73          ASSERT (errno == EBADF);
      74          ASSERT (ferror (fp));
      75          fclose (fp);
      76        }
      77    }
      78    {
      79      FILE *fp;
      80      close (99);
      81      fp = fdopen (99, "w");
      82      if (fp != NULL)
      83        {
      84          char buf[5] = "world";
      85          setvbuf (fp, NULL, _IONBF, 0);
      86          errno = 0;
      87          ASSERT (fwrite (buf, 1, sizeof (buf), fp) == 0);
      88          ASSERT (errno == EBADF);
      89          ASSERT (ferror (fp));
      90          fclose (fp);
      91        }
      92    }
      93  
      94    /* Clean up.  */
      95    unlink (filename);
      96  
      97    return 0;
      98  }