How does a program get its path name?

[Peter Shipley]

In article <7304 at brl-smoke.ARPA> gwyn at brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>) writes:
>In article <11923 at brl-adm.ARPA> Leisner.Henr at xerox.com (marty) writes:
>>How does an exec program get the pathname it was execed from if it wants to find
>>out this information?
>
>That information is not generally available to the process.
>
>>(I'm specifically asking how cc knows to looks at ../lib for the compiler
>>passes).
>
>I don't know of any "cc"s that work like that.  Usually the pathnames
>of the slave programs are hard-wired into the "cc" code, although
>they're sometimes configurable via the makefile for cc when it's built.

I thought that the path came from the user's environment 
variable PATH.

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Pete Shipley: 
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