From: Jeff Garzik <jeff@garzik.org>
To: "Robert P. J. Day" <rpjday@crashcourse.ca>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: what's the purpose of MAXHOSTNAMELEN?
Date: Tue, 29 Dec 2009 14:40:05 -0500 [thread overview]
Message-ID: <4B3A5B15.5060807@garzik.org> (raw)
In-Reply-To: <alpine.LFD.2.00.0912291416230.4967@localhost>
On 12/29/2009 02:19 PM, Robert P. J. Day wrote:
>
> in prepping for coalescing a lot of param.h files, i'm curious about
> the purpose of this macro:
>
> $ grep -rw MAXHOSTNAMELEN *
> arch/s390/include/asm/param.h:#define MAXHOSTNAMELEN 64 /* max length of hostname */
> arch/sparc/include/asm/param.h:#define MAXHOSTNAMELEN 64 /* max length of hostname */
> arch/alpha/include/asm/param.h:#define MAXHOSTNAMELEN 64 /* max length of hostname */
> arch/mn10300/include/asm/param.h:#define MAXHOSTNAMELEN 64 /* max length of hostname */
> arch/arm/include/asm/param.h:#define MAXHOSTNAMELEN 64
> arch/m32r/include/asm/param.h:#define MAXHOSTNAMELEN 64 /* max length of hostname */
> arch/mips/include/asm/param.h:#define MAXHOSTNAMELEN 64 /* max length of hostname */
> arch/m68k/include/asm/param.h:#define MAXHOSTNAMELEN 64 /* max length of hostname */
> arch/xtensa/include/asm/param.h:#define MAXHOSTNAMELEN 64 /* max length of hostname */
> arch/ia64/include/asm/param.h:#define MAXHOSTNAMELEN 64 /* max length of hostname */
> arch/h8300/include/asm/param.h:#define MAXHOSTNAMELEN 64 /* max length of hostname */
> arch/avr32/include/asm/param.h:#define MAXHOSTNAMELEN 64
> arch/cris/include/asm/param.h:#define MAXHOSTNAMELEN 64 /* max length of hostname */
> arch/um/include/asm/param.h:#define MAXHOSTNAMELEN 64 /* max length of hostname */
> arch/powerpc/include/asm/param.h:#define MAXHOSTNAMELEN 64 /* max length of hostname */
> arch/parisc/include/asm/param.h:#define MAXHOSTNAMELEN 64 /* max length of hostname */
> arch/frv/include/asm/param.h:#define MAXHOSTNAMELEN 64 /* max length of hostname */
> include/asm-generic/param.h:#define MAXHOSTNAMELEN 64 /* max length of hostname */
> include/net/sctp/structs.h:#include<asm/param.h> /* We get MAXHOSTNAMELEN. */
> $
>
> so lots of people define it but no one uses it. it *is* exported to
> user space in /usr/include/asm/param.h, but i still have no idea what
> it's for in user space. obsolete?
According to RFC 1034, "Each node has a label, which is zero to 63
octets in length"
What is it used for in userspace, and why is it export from the kernel?
Good question...
Jeff
next prev parent reply other threads:[~2009-12-29 19:40 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-29 19:19 what's the purpose of MAXHOSTNAMELEN? Robert P. J. Day
2009-12-29 19:28 ` Samuel Thibault
2009-12-29 19:40 ` Jeff Garzik [this message]
2009-12-29 19:56 ` Samuel Thibault
2009-12-29 20:20 ` Jeff Garzik
2009-12-29 20:26 ` Samuel Thibault
2009-12-29 21:00 ` Vikram Dhillon
2009-12-29 20:13 ` Robert P. J. Day
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4B3A5B15.5060807@garzik.org \
--to=jeff@garzik.org \
--cc=linux-kernel@vger.kernel.org \
--cc=rpjday@crashcourse.ca \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox