Date: Mon, 16 Feb 2004 02:32:54 -0800 From: David Schultz <das@FreeBSD.ORG> To: Andre Oppermann <andre@FreeBSD.ORG> Cc: freebsd-standards@FreeBSD.ORG Subject: Re: writev(2) and IOV_MAX confusion Message-ID: <20040216103254.GA7779@VARK.homeunix.com> In-Reply-To: <40309723.5020808@freebsd.org> References: <40309723.5020808@freebsd.org>
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On Mon, Feb 16, 2004, Andre Oppermann wrote: > The is a big confusion over the correct definition of IOV_MAX in relation > to writev(2). The man page for write(2)/writev(2) says you only have to > include <sys/uio.h> to get everything. Unfortunatly IOV_MAX is not (no > longer?) defined there but in <sys/syslimits.h>. Both Net- and OpenBSD > still define it in <sys/uio.h> but NetBSD only for compatibility. For > them the correct place seems to be <sys/syslimits.h> too but only when > _XOPEN_SOURCE is defined. > > What is the correct place for IOV_MAX? And what has to be adjusted, the > man page or the .h files? In POSIX, you get IOV_MAX only by including <limits.h>, and FreeBSD's <limits.h> includes <sys/syslimits.h>, so the code is correct here. As far as I can tell, the man page doesn't say anything about what you have to include to get IOV_MAX, but I suppose it could be more clear.
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