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Date: Mon, 09 Jun 2008 00:08:53 +0200
From: =?UTF-8?B?SmFuIEt1bmRyw6F0?= <jkt@gentoo.org>
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Subject: Re: [gentoo-dev] Re: lastrite: dev-cpp/libherdstat and app-portage/herdstat
References: <g2eghs$n3a$1@ger.gmane.org> <484B37D2.305@gentoo.org> <Pine.LNX.4.64.0806072149160.15986@rutrow.coat.com> <m2ve0kcduf.fsf@gmail.com> <484BD368.6050107@gentoo.org> <m2mylwc7g3.fsf@gmail.com> <484C54FB.1000808@gentoo.org>
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Alin N=C4=83stac wrote:
> I remember that one time I had to split a command like dohtml=20
> "${S}"/something/*.{png,html} because the line was too long. At that=20
> time, bash had a limit of 32K. Now is what ... 1M?
from execve(2):
Limits on size of arguments and environment
Most Unix implementations impose some limit on the total size of the=20
command-line argument (argv) and environment (envp) strings that may be=20
passed to a new program. POSIX.1 allows an implementation to advertise=20
this limit using the ARG_MAX constant (either defined in <limits.h> or=20
available at run time using the call sysconf(_SC_ARG_MAX)).
On Linux prior to kernel 2.6.23, the memory used to store the=20
environment and argument strings was limited to 32 pages (defined by the =
kernel constant MAX_ARG_PAGES). On architectures with a 4-kB page size,=20
this yields a maximum size of 128 kB.
On kernel 2.6.23 and later, most architectures support a size limit=20
derived from the soft RLIMIT_STACK resource limit (see getrlimit(2)).=20
For these architectures, the total size is limited to 1/4 of the allowed =
stack size, the limit per string is 32 pages (the kernel constant=20
MAX_ARG_STRLEN), and the maximum number of strings is 0x7FFFFFFF. (This=20
change allows programs to have a much larger argument and/or environment =
list. Imposing the 1/4-limit ensures that the new program always has=20
some stack space.) Architectures with no memory management unit are=20
excepted: they maintain the limit that was in effect before kernel 2.6.23=
=2E
Cheers,
-jkt
--=20
cd /local/pub && more beer > /dev/mouth
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