Bug#225304: marked as done (libc6-dev: OPEN_MAX undeclared after using limits.h)
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From: Simone Piccardi <piccardi@firenze.linux.it>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: libc6-dev: OPEN_MAX undeclared after using limits.h
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Package: libc6-dev
Version: 2.3.2.ds1-10
Severity: normal
I'm trying to use OPEN_MAX in a sample program. But it get not declared also
after including limits.h.
-- System Information:
Debian Release: testing/unstable
Architecture: i386
Kernel: Linux gont.earthsea.ea 2.4.21 #4 Thu Aug 14 22:23:43 CEST 2003 i686
Locale: LANG=C, LC_CTYPE=C
Versions of packages libc6-dev depends on:
ii libc6 2.3.2.ds1-10 GNU C Library: Shared libraries an
ii linux-kernel-headers 2.5.999-test7-bk-10 Linux Kernel Headers for developme
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Date: Fri, 02 Jan 2004 02:33:26 +0900
Message-ID: <817k0bsheh.wl@omega.webmasters.gr.jp>
From: GOTO Masanori <gotom@debian.or.jp>
To: Colin Watson <cjwatson@debian.org>, 225304-done@bugs.debian.org
Cc: Simone Piccardi <piccardi@firenze.linux.it>
Subject: Re: Bug#225304: libc6-dev: OPEN_MAX undeclared after using limits.h
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<20031230032959.GJ15517@riva.ucam.org>
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At Tue, 30 Dec 2003 03:29:59 +0000,
Colin Watson wrote:
> On Sun, Dec 28, 2003 at 04:17:07PM +0100, Simone Piccardi wrote:
> > Package: libc6-dev
> > Version: 2.3.2.ds1-10
> > Severity: normal
> >
> > I'm trying to use OPEN_MAX in a sample program. But it get not declared also
> > after including limits.h.
>
> This is deliberate and not a bug. For example,
> /usr/include/bits/local_lim.h says:
>
> /* The kernel header pollutes the namespace with the NR_OPEN symbol
> and defines LINK_MAX although filesystems have different maxima. A
> similar thing is true for OPEN_MAX: the limit can be changed at
> runtime and therefore the macro must not be defined. Remove this
> after including the header if necessary. */
>
> POSIX does not require OPEN_MAX to be defined as a macro. If such a
> macro is not defined, you should use sysconf(_SC_OPEN_MAX) to discover
> the current value. See 'info libc "General Limits"', particularly the
> first two paragraphs.
Exactly. I've closed this bug.
Regards,
-- gotom
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