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Date: Tue, 29 Dec 2015 17:43:41 +0100
From: Houder <houder AT xs4all DOT nl>
To: cygwin AT cygwin DOT com
Subject: Re: cmp (or echo) bug?
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On 2015-12-25 22:32, David Balažic wrote:
> Hi!
> 
> In Cygwin terminal (bash) I typed:
> 
> cmp  <(echo echo1)  <(echo echo2)
> 
> This does not print anything.
> Not even with -b.
> 
> On Linux (Ubuntu 12.04 in VMWare) it reports that the inputs are 
> different.
> 
> Bug?
> Or am I missing something?

@@ uname -a
CYGWIN_NT-6.1-WOW Seven 2.3.1(0.291/5/3) 2015-11-14 12:42 i686 Cygwin
@@ ./cmp <(echo echo1) <(echo echo2)
/dev/fd/63 /dev/fd/62 differ: byte 5, line 1
@@ ./cmp <(echo echo1) <(echo echo2)
/dev/fd/63 /dev/fd/62 differ: byte 5, line 1
@@ ./cmp <(echo echo1) <(echo echo2)
/dev/fd/63 /dev/fd/62 differ: byte 5, line 1
@@ ./cmp <(echo echo1) <(echo echo2)
/dev/fd/63 /dev/fd/62 differ: byte 5, line 1
@@ ./cmp <(echo echo1) <(echo echo2)
/dev/fd/63 /dev/fd/62 differ: byte 5, line 1
@@ ./cmp <(echo echo1) <(echo echo2)
/dev/fd/63 /dev/fd/62 differ: byte 5, line 1

etc.

But only after I had modified cmp.c (diffutils) as follows:

int
main (int argc, char **argv)
{
...

#if 0
       if (file_desc[f1] < 0 || fstat (file_desc[f1], stat_buf + f1) != 
0)
#else
       if (file_desc[f1] < 0 || f1 ? ( stat (file[1], stat_buf + f1) != 0 
)
                                   : ( stat (file[0], stat_buf + f1) != 0 
) ) // Henri: suspect fstat
#endif
         {
           if (file_desc[f1] < 0 && comparison_type == type_status)
             exit (EXIT_TROUBLE);
           else
             error (EXIT_TROUBLE, errno, "%s", file[f1]);
         }
     }

   /* If the files are links to the same inode and have the same file 
position,
      they are identical.  */

   if (0 < same_file (&stat_buf[0], &stat_buf[1])
       && same_file_attributes (&stat_buf[0], &stat_buf[1])
       && file_position (0) == file_position (1))
{ // Henri: diagnostics
#if 0
     printf("same_file = %d\n", same_file (&stat_buf[0], &stat_buf[1]) );
     printf("same_file_attributes = %d\n", same_file_attributes 
(&stat_buf[0], &stat_buf[1]) );
     printf("same file pos = %d\n", file_position (0) == file_position 
(1) );
#endif
     printf("file[0] = %s, file[1] = %s\n", file[0], file[1]);
     printf("file_desc[0] = %d, file_desc[1] = %d\n", file_desc[0], 
file_desc[1]);
     printf("bailing out: same file.\n");
     return EXIT_SUCCESS;
}

Regards,
Henri


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