fix return code for pipe(2) syscall

[Julian Elischer]

Garrett Wollman wrote:

>In article <20060127093602.GO83922 at cell.sick.ru> you write:
>
>  
>
>>Yes, according to SUSv3 the only errors from pipe(2) are ENFILE
>>and EMFILE.
>>    
>>
>
>POSIX does not define an exhaustive enumeration of error conditions.
>*Any* error return is permissible, provided only that *for those
>conditions noted in the ERRORS section* the code identified for that
>condition is returned.  It is perfectly permissible for every system
>call to fail with [ENOTADUCK] unless the first five bytes of the
>caller's address space contain the word "quack".
>
>  
>

I like it.
We should implement this asap.

>-GAWollman
>
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