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From: Juan Manuel Guerrero <juan DOT guerrero AT gmx DOT de>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: gcc difficulties on MSDOS 6.22 with LFN driver installed
Date: Sat, 3 Sep 2011 08:16:46 -0700 (PDT)
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Reply-To: djgpp AT delorie DOT com

On 2 Sep., 18:40, Eli Zaretskii <e DOT  DOT  DOT  AT gnu DOT org> wrote:
> > Date: Fri, 2 Sep 2011 17:25:48 +0300
> > From: Ozkan Sezer <seze DOT  DOT  DOT  AT gmail DOT com>
>
> > Something like the following then?  (Very quick+dirty patch, I know.)
>
> Yes, thanks.  Although it would be better to know whether DOSLFN
> returns -1 in offset 0x24 or non-zero in offset 0x20, and have a more
> fine-grain recovery here.
>
> > I also wonder whether fchmod() and/or fstat() are affected by this
> > lfn issue...
>
> Juan, can you test that?

All functions that call filelength/lfilelength
will be affected by this bug.  The same applies
to all ports that have been compiled with djdev204.
GDB is an example.  To debug this with DOSLFN installed
I had to use the 2.03 version of latest GDB port.

fcmod is no concerned but fstat is.  fstat calls
filelength() so it fails.  The values of both
offsets are printed by filelength().
The test program below generates this output:

offset 0x24 = 0x9713c0  offset 0x20 = 0x8f4000

fstat:  errno=40  status=-1  size=0

fchmod:  errno=0  status=0


Regards,
Juan M. Guerrero


#include <sys/stat.h>

#include <errno.h>

#include <stdio.h>



int main(void)

{

  FILE *f = fopen("./foobar.txt", "w");

  struct stat sbuf;

  int status;



  fprintf(f, "%s\n", "The file name is foobar.txt");

  fflush(f);



  errno = 0;

  status = fstat(fileno(f), &sbuf);

  printf("fstat:  errno=%d  status=%d  size=%d\n", errno, status,
sbuf.st_size);



  errno = 0;

  status = fchmod(fileno(f), S_IWUSR|S_IRUSR);

  printf("fchmod:  errno=%d  status=%d\n", errno, status);



  return 0;

}