On Sun, 27 Apr 2003, Werner Almesberger wrote:
> How about
>
> fdrplc(3,fmap);
> exec("/bin/cat",...);
Not a bad idea. Although my initial motives were to try and reduce the
number of syscalls for forking processes, I can see this as kind of a
useful call as well.
> 0) System call names must be short and cryptic :-)
Heh. How about something like fdmap_set()?
> 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.
Good point. Just a quick verify_area() check and then process away.
> 2) System call overhead is marginal, particularly in this case.
Depends. I know that on the one multi-user Linux machine I do use on a
day-to-day basis syscall overhead is painful:
Calibrating delay loop.. ok - 16.59 BogoMIPS
and considering this is a multi-user machine with quite a few users always
tapping away doing quick commands (edit this file, run this program, copy
this file, ...).
> 3) There may be other uses than exec(2), where a way for closeing
> all fds and getting a new set may be useful.
Agreed.
L8r,
Mark G.
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This archive was generated by hypermail 2b29 : Wed Apr 30 2003 - 22:00:28 EST