Re: writev(2) and IOV_MAX confusion

From: Andre Oppermann (andre_at_freebsd.org)
Date: 02/16/04

  • Next message: Pawel Jakub Dawidek: "Re: Jails that keep hanging around" 
    Date: Mon, 16 Feb 2004 16:40:02 +0100
To: David Schultz <das@FreeBSD.ORG>

    David Schultz wrote:
    >
    > 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.

    Yes, the write(2) man page is missing any reference to <limits.h>.
    I'd say the man page should mention that. 

    -- 
Andre
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