add closefrom() call

[Ed Schouten]

* Julian Elischer <julian at elischer.org> wrote:
> Ed Schouten wrote:
>> Wouldn't it be better to just implement it through fcntl() and implement
>> closefrom() in libc?
>
> that's a possibility but I personally thing the huge difference in 
> efficiency
> makes it worth putting it in the kernel.
> Quite a few programs I know of could really help their startup time with 
> this as the first thing they do is "close the first 2000 file descriptors.

Woops! Sorry for responding this late, but it looks like I didn't
explain myself good enough. Sorry. :) To rephrase myself:

Wouldn't it be better to just implement fcntl(..., F_CLOSEM, ...) in the
kernel and make closefrom() a simple libc routine:

void
closefrom(int lowfd)
{
	fcntl(lowfd, F_CLOSEM, NULL);
}

Similar to creat(2).

-- 
 Ed Schouten <ed at fxq.nl>
 WWW: http://g-rave.nl/
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