add closefrom() call

[Ed Schouten]

* LI Xin <delphij at delphij.net> wrote:
> Here is my implementation for FreeBSD.  Some difference between my and
> DragonFly's implementation:
> 
>  - closefrom(-1) would be no-op on DragonFly, my version would close all
> open files (From my understanding of OpenSolaris's userland
> implementation, this is Solaris's behavior).
>  - my version closefrom(very_big_fd) would result in EBADF.  I am not
> very sure whether this is correct, but it does not hurt for applications
> that thinks closefrom() would return void.

Wouldn't it be better to just implement it through fcntl() and implement
closefrom() in libc?

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