Date: Thu, 30 Jun 2005 12:13:58 +0200 From: Adriaan de Groot <groot@kde.org> To: freebsd-amd64@freebsd.org Subject: Re: sript (Perl) test code needed (was: How to build JDK15 on AMD64 with FreeBSD?) Message-ID: <200506301213.58569.groot@kde.org> In-Reply-To: <20050629221047.GC20836@dragon.NUXI.org> References: <42BC8310.9040501@cse.unl.edu> <20050626042355.GA41119@misty.eyesbeyond.com> <20050629221047.GC20836@dragon.NUXI.org>
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On Thursday 30 June 2005 00:10, David O'Brien wrote:
> On Sat, Jun 25, 2005 at 10:23:56PM -0600, Greg Lewis wrote:
> > and follow the instructions. There is one caveat on amd64 -- one of the
> > build commands will fail strangely (this is a bug in the Linux emulation
> > on amd64 as far as I can determine).
>
> I know this should be trivial to do in perl and maybe someone here has the
> time to hack it up. I want a small test script (actually some other
> scripting language than perl preferred).
> The script should run the following commands until an error is returned:
> and when the error occurs print out the length of the command line.
> I want to get the bottom of the "command too long" issue that causes too
> much trouble deploying Java on FreeBSD/AMD64.
Well, in the setup you posit here, you run into the maximum file-name length
of 1024 well before you run into the length of the maximum command-line
(kern.argmax). The following quick test tests the maximum command-line (it's
a lot like the autoconf test for maximum command-line length);
#! /usr/bin/env perl
@what = ( "././././././././" );
while ( 0 == system( "ls",@what) )
{
push(@what , @what);
print STDERR "Length " . (@what + 0) . "\n";
}
It stops after printing Length 4096, so 2+4096*16 bytes of command-line is too
much (and indeed, my kern.argmax is 65536) (hm, does a NUL terminating byte
count towards argmax?).
Doing something more subtle finishes at Length 3776 (* 16 bytes, possibly 17
-- in any case less that 65536).
--
These are your friends - Adem
GPG: FEA2 A3FE Adriaan de Groot
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