Date: Mon, 23 Apr 2001 15:08:27 +0200 (CEST) From: Oliver Fromme <olli@secnetix.de> To: freebsd-current@FreeBSD.ORG Subject: Re: cp -d dir patch for review (or 'xargs'?) Message-ID: <200104231308.PAA18220@lurza.secnetix.de> In-Reply-To: <200104230521.WAA76392@gndrsh.dnsmgr.net>
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Rodney W. Grimes <freebsd@gndrsh.dnsmgr.net> wrote:
> > Before anyone starts writing scripts, consider that {} will be
> > replaced by xargs with (roughly) ARG_MAX - 10 characters worth of the
> > stuff coming off the pipe. If your combined arguments plus
> > environment exceeds ARG_MAX execve(2) will give you E2BIG.
>
> No rain here, it is ARG_MAX - 2048:
> -s size
> Set the maximum number of bytes for the command line length pro-
> vided to utility. The sum of the length of the utility name and
> the arguments passed to utility (including NULL terminators) will
> be less than or equal to this number. The current default value
> for size is ARG_MAX - 2048.
>
> 2K would be a pretty big env, root default std is about 367 bytes.
>
> Yes, that is probably not a portable assumption to make, but it is
> far better than using non-standard options to xargs.
If I'm not mistaken, the size of the environment is already
taken into account by the xargs utility (subtracted from
ARG_MAX). So this isn't an issue at all.
Regards
Oliver
--
Oliver Fromme, secnetix GmbH & Co KG, Oettingenstr. 2, 80538 München
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