cmp (or echo) bug?

[David Balažic]

cat and diff work as expected:

$ cat  <(echo echo1)  <(echo echo2)
echo1
echo2


$ diff  <(echo echo1)  <(echo echo2)
1c1
< echo1
---
> echo2


So maybe the bug is really in cmp.

Regards,
David


On 29 December 2015 at 17:43, Houder <houder@xs4all.nl> wrote:
> 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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