From: jw schultz <jw@pegasys.ws>
To: Linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Changing argv[0] under Linux.
Date: Wed, 15 Jan 2003 00:25:27 -0800 [thread overview]
Message-ID: <20030115082527.GA22689@pegasys.ws> (raw)
In-Reply-To: <20030115044644.GA18608@mark.mielke.cc>
On Tue, Jan 14, 2003 at 11:46:44PM -0500, Mark Mielke wrote:
> On Tue, Jan 14, 2003 at 03:11:41PM -0800, Bob Miller wrote:
> > On Tue, Jan 14, 2003 at 03:04:18PM -0800, Bob Miller wrote:
> > > Or you can copy your all your args and env to a temporary place and
> > > then re-build your args and env with the new argv[0] in it's place.
> > > But you must be carefull that your new argv[0] length plus the
> > > length of all remaining args, envp and pointers is not greater than
> > > the system defined size for this space.
> > In thinking about this more this will NOT work. The user stack starts
> > right after your envp. So, writing more info there would blow away
> > your stack.
>
> I can smell the next hack... memmove() the stack down to make room... :-)
No need. You can memcpy the environment. See setenv(3),
putenv(3) and related library routines.
Once you've parsed your argv who cares if you overwrite it,
put a double NULL at the end, set argc = 1 and argv[1] =
NULL. If argv[argc] - argv[0] + strlen(argv[argc] is
shorter than what you overwrite it with you won't even need
to relocate the environment block if you wish to preserve
that. Just don't leave any loose ends to confuse /proc and
the ps utils.
--
________________________________________________________________
J.W. Schultz Pegasystems Technologies
email address: jw@pegasys.ws
Remember Cernan and Schmitt
next prev parent reply other threads:[~2003-01-15 8:17 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-14 18:59 Changing argv[0] under Linux DervishD
2003-01-14 19:10 ` Richard B. Johnson
2003-01-14 19:14 ` DervishD
2003-01-14 19:43 ` Richard B. Johnson
2003-01-14 19:50 ` DervishD
2003-01-14 19:56 ` Richard B. Johnson
2003-01-14 20:23 ` Mark Mielke
2003-01-14 20:28 ` Richard B. Johnson
2003-01-14 21:21 ` Mark Mielke
2003-01-15 14:00 ` Richard B. Johnson
2003-01-15 16:43 ` Richard B. Johnson
2003-01-15 16:57 ` DervishD
2003-01-14 22:00 ` DervishD
2003-01-21 14:16 ` Bill Davidsen
2003-01-21 15:33 ` DervishD
2003-01-14 20:25 ` Philippe Troin
2003-01-14 20:56 ` Richard B. Johnson
2003-01-14 22:04 ` DervishD
2003-01-14 23:04 ` Bob Miller
2003-01-14 23:11 ` Bob Miller
2003-01-15 4:46 ` Mark Mielke
2003-01-15 8:25 ` jw schultz [this message]
2003-01-15 11:41 ` DervishD
2003-01-15 13:16 ` Jakob Oestergaard
2003-01-15 16:22 ` DervishD
2003-01-15 16:47 ` Jakob Oestergaard
2003-01-15 17:10 ` DervishD
2003-01-15 17:36 ` Changing argv[0] under Linux. This MUST work DervishD
2003-01-15 21:26 ` Changing argv[0] under Linux Andreas Schwab
2003-01-15 21:36 ` Jesse Pollard
2003-01-15 22:03 ` DervishD
2003-01-16 9:19 ` Dorin Lazar
2003-01-15 11:35 ` DervishD
2003-01-14 21:55 ` Miquel van Smoorenburg
2003-01-14 22:04 ` Valdis.Kletnieks
2003-01-15 11:28 ` DervishD
2003-01-27 7:47 ` Anuradha Ratnaweera
[not found] <122203493@toto.iv>
2003-01-14 22:55 ` Peter Chubb
2003-01-16 10:12 Jon Burgess
2003-01-16 10:32 ` DervishD
2003-01-16 11:31 Jon Burgess
2003-01-16 12:58 ` DervishD
[not found] <20030116130013.GE1358@DervishD>
[not found] ` <200301161315.h0GDFLM27487@isengard.accucard.com>
2003-01-17 10:08 ` DervishD
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