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From: Lutz Boehne <lboehne@damogran.de>
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Subject: Re: Aqcuiring full path to running process from outside the kernel
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> but argv[0] is either an absolute path or a path relative to pwd,
> unless your shell is broken.

One should also consider users breaking argv[0] intentionally, e.g. 
pointing it to other files which could lead to undesired/unpredictable 
behaviour. Even as a fallback it's probably not wise to trust it.

Lutz