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Message-ID: <20091229195608.GG4815@const> Date: Tue, 29 Dec 2009 20:56:08 +0100 From: Samuel Thibault <samuel.thibault@...-lyon.org> To: Jeff Garzik <jeff@...zik.org> Cc: "Robert P. J. Day" <rpjday@...shcourse.ca>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: what's the purpose of MAXHOSTNAMELEN? Jeff Garzik, le Tue 29 Dec 2009 14:40:05 -0500, a écrit : > On 12/29/2009 02:19 PM, Robert P. J. Day wrote: > >arch/s390/include/asm/param.h:#define MAXHOSTNAMELEN 64 /* max > >length of hostname */ > > > > 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" That's for Internet networks. Other kinds of networks could implement more. It could make sense to restrict ourself to Internet standards, but we don't :) > What is it used for in userspace, and why is it export from the kernel? Gethostname, typically, but also all kinds of functions that provide a hostname. It's also quite often completely badly used, for instance for getnameinfo()... You have Debian's list on http://unstable.buildd.net/buildd/hurd-i386_Failed.html Samuel -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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