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Date: Wed, 15 Jan 2003 18:36:56 +0100
From: DervishD <raul@pleyades.net>
To: Jakob Oestergaard <jakob@unthought.net>
Cc: Linux-kernel <linux-kernel@vger.kernel.org>
Subject: Changing argv[0] under Linux. This MUST work...
Message-ID: <20030115173656.GG86@DervishD>
References: <20030114220401.GB241@DervishD> <20030114230418.GB4603@doc.pdx.osdl.net> <20030114231141.GC4603@doc.pdx.osdl.net> <20030115044644.GA18608@mark.mielke.cc> <20030115082527.GA22689@pegasys.ws> <20030115114130.GD66@DervishD> <20030115131617.GA8621@unthought.net> <20030115162219.GB86@DervishD> <20030115164731.GB8621@unthought.net> <20030115171009.GF86@DervishD>
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    Hi Jakob :)

    Your solution of exec'ing ourselves MUST undoubtly work (well, I
know that this an affirmation that I will lament XDDDD), because it
only relies on 'exec()' passing the argv[0] you provide as the
argv[0] of the invoked binary, and that should work or programs like
'/bin/login' will stop working... They rely on the same principle,
since they need to prepend an '-' to the shell name to make it a
login shell :))) Didn't remember this until now!

    So, if you do 'execl(ourselves, "my new name", ..., NULL)', the
argv[0] received by the binary specified in 'ourselves' MUST be 'my
new name'. Otherwise '/bin/login' and a good bunch of shells won't
work...

    If you happen to come to Spain at any point in the future, just
tell me, I'll buy you a beer (or crack, or whatever you use XDDD).

    Thanks :)

    Ra?l
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