Date: Tue, 26 Jan 2010 12:21:42 -0800 From: Xin LI <delphij@delphij.net> To: John Baldwin <jhb@freebsd.org> Cc: Robert Watson <rwatson@freebsd.org>, freebsd-net@freebsd.org, d@delphij.net, delphij@freebsd.org Subject: Re: [PATCH] Interface description Message-ID: <4B5F4ED6.1070400@delphij.net> In-Reply-To: <201001261140.51006.jhb@freebsd.org> References: <4B5E16DB.2080203@delphij.net> <201001261140.51006.jhb@freebsd.org>
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On 2010/01/26 08:40, John Baldwin wrote:
> I just have two suggestions/comments:
> @@ -295,6 +295,7 @@ struct ifreq {
[...]
> I prefer to not have this all on one line, but to instead be:
[...]
> Even better would be to actually define a separate type earlier
> in the file I think:
[...]
> I think caddr_t is deprecated in favor of void * for new APIs at least.
I have split it into another type and used void *, also updated the
manual page.
> Second, it would be nice if SIOCGIFDESCR provided length feedback to userland
> similar to sysctl(3). Maybe change the code to set ifr.ifr_buffer.length to
> the required length when returning ENAMETOOLONG. Userland can then just skip
> to that length directly, or instead use an idiom similar to sysctl where it
> does the following:
Done in a slightly different way. It seems to be slightly wasteful (not
a big deal, though) to ioctl every time to obtain the length, so I used
an arbitrary number (2^6) and make the program to adapt to larger number
if kernel gave feedback with ENAMETOOLONG, and the buffer/length would
be used the next call.
Cheers,
- --
Xin LI <delphij@delphij.net> http://www.delphij.net/
FreeBSD - The Power to Serve! Live free or die
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