GNU bug report logs - #6500
rm 8.1

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From: Brad <b.mells <at> outwild.net>
To: Jim Meyering <jim <at> meyering.net>
Cc: bug-coreutils <at> gnu.org, Brad <b.mells <at> outwild.net>
Subject: bug#6500: rm 8.1
Date: Thu, 24 Jun 2010 10:16:53 -0700

Hi Jim, my copy of fts.i looks the same as yours. Here is the additional 
gdb output:

### begin gdb ###
Starting program: /home/brad/tools/core_debug/src/rm -rf a/b/c/d

Breakpoint 1, fts_open (argv=0x7fffffffed08, options=536, compar=0) at 
fts.c:92
92      {
(gdb) print options & ~0x07ff
$1 = 0

### end gdb ###

Please tell me what this means. I knew the bit flags from function rm in 
src/remove.c:

      int bit_flags = (FTS_CWDFD
                       | FTS_NOSTAT
                       | FTS_PHYSICAL);

      if (x->one_file_system)
        bit_flags |= FTS_XDEV;

      FTS *fts = xfts_open (file, bit_flags, NULL);


and of course the option mask from lib/fts_.h:

# define FTS_OPTIONMASK 0x07ff          /* valid user option mask */

But how do you read this from the gdb output?

Thanks for your help. I really appreciate your prompt attention to this 
matter. Please let me know if there is anything else you need me to do.


Jim Meyering wrote:
> Brad wrote:
> ...
>> (gdb) run -rf a/b/c/d
>> Starting program: /home/brad/tools/core_debug/src/rm -rf a/b/c/d
>>
>> Breakpoint 1, fts_open (argv=0x7fffffffed08, options=536, compar=0) at
>> fts.c:92
>> 92      {
>> (gdb) n
>> 100             if (options & ~FTS_OPTIONMASK) {
>> (gdb) n
>> 101                     __set_errno (EINVAL);
>> (gdb) n
>> 201     }
>> (gdb) n
>> xfts_open (argv=0x7fffffffed08, options=536, compar=0) at
>> ../../coreutils-8.5/lib/xfts.c:37
> 
> Thanks.  that "options" value is 0x218, which makes sense:
> 
>     # define FTS_NOSTAT     0x0008          /* don't get stat info */
>     # define FTS_PHYSICAL   0x0010          /* physical walk */
>     # define FTS_CWDFD      0x0200
> 
>       int bit_flags = (FTS_CWDFD | FTS_NOSTAT | FTS_PHYSICAL);
>       ...
>       FTS *fts = xfts_open (file, bit_flags, NULL);
> 
> The other value in that comparison should come from fts_.h:
> 
>     # define FTS_OPTIONMASK 0x07ff          /* valid user option mask */
> 
> But is that actually the value used on your system?
> 
> To find out, do this:
> 
>     cd lib
>     rm fts.o
>     make AM_CFLAGS='-E -dD' fts.o
> 
> That is a hack to obtain C-preprocessed sources.
> Rename the file to have a sensible suffix, and so it
> doesn't interfere with a subsequent build:
> 
>     mv fts.o fts.i
> 
> In my copy, I see this:
> 
>         if (options & ~0x07ff) {
>                 (*__errno_location ()) = (22);
>                 return (((void *)0));
>         }
> 
> If you see the same thing, then suspect that your compiler is at fault.
> In that case, there's one more thing you can do:
> 
> Repeat the steps you performed above, then run this command right after
> hitting the breakpoint, and tell us what it prints:
> 
>   print options & ~0x07ff
> 

-- 
Brad Mells
Quantum Harmonics
889 Mowry Ave #86
Fremont CA 94536

619.808.2359

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