Re: [RFD] Combined fork-exec syscall.

[Rafael Santos <rafael@thinkfreak.com.br>]

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This is not the point.


4/27/03 11:42:15 PM, Werner Almesberger <wa@almesberger.net> wrote:

>Mark Grosberg wrote:
>>    fmap[0] = in[0];                     /* STDIN  */
>>    fmap[1] = out[1];                    /* STDOUT */
>>    fmap[2] = open("/dev/null", O_RDWR); /* STDERR */
>>    fmap[3] = -1;                        /* end    */
>> 
>>    p = nexec("/bin/cat",
>>              null_argv,
>>              NULL,
>>              filmap);
>
>How about
>
>    fdrplc(3,fmap);
>    exec("/bin/cat",...);
>
>?
>
>0) System call names must be short and cryptic :-)
>1) Requiring the kernel to iterate over the array element by element
>   in order to find out how big it is may be inefficient. Better to
>   pass the length.
>2) System call overhead is marginal, particularly in this case.
>3) There may be other uses than exec(2), where a way for closeing
>   all fds and getting a new set may be useful.
>
>- Werner
>
>-- 
>  _________________________________________________________________________
> / Werner Almesberger, Buenos Aires, Argentina         wa@almesberger.net /
>/_http://www.almesberger.net/____________________________________________/
>-
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Rafael Costa dos Santos
ThinkFreak Comércio e Soluções em Hardware e Software
Rio de Janeiro / RJ / Brazil
rafael@thinkfreak.com.br
+ 55 21 9432-9266