Date: Sun, 15 Jul 2007 16:51:38 -0700 From: Julian Elischer <julian@elischer.org> To: Ed Schouten <ed@fxq.nl> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: add closefrom() call Message-ID: <469AB30A.5000001@elischer.org> In-Reply-To: <20070715211549.GB39075@hoeg.nl> References: <de5dfb5a0707041727j3e3518f9l5a019717a9f90aa@mail.gmail.com> <20070705122650.GE1302@britannica.bec.de> <468E16E6.6030608@delphij.net> <20070706112453.GA3217@hoeg.nl> <468E7007.5050607@elischer.org> <20070715211549.GB39075@hoeg.nl>
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Ed Schouten wrote:
> * Julian Elischer <julian@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);
> }
>
what on earth would that achieve?
(as opposed to just a simple syscall)
> Similar to creat(2).
>
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