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From: hunt@spar.SPAR.SLB.COM (Neil Hunt)
Newsgroups: comp.lang.c
Subject: Re: Accessing argc & argv from a functi
Message-ID: <274@spar.SPAR.SLB.COM>
Date: Thu, 6-Aug-87 13:42:49 EDT
Article-I.D.: spar.274
Posted: Thu Aug  6 13:42:49 1987
Date-Received: Sat, 8-Aug-87 12:53:44 EDT
References: <22@flmis06.ATT.COM> <28700019@ccvaxa>
Reply-To: hunt@spar.UUCP (Neil Hunt)
Organization: Schlumberger Palo Alto Research - CASLAB
Lines: 22

I have thought of another (rather silly) way to obtain the
arguments to a program without having access to main:  :-)

Set up a command which uses ps to obtain the long listing of
all processes, egrep the line containing the current PID obtained
from getpid, pipe it through the stream editor using a script
to throw away the useless parts of the ps listing, leaving just the
args, and stick the whole lot into a file:

	sprintf(str, "ps -uwww | egrep %d | sed -f com > /tmp/args", getpid());

Execute the command pipe using system:

	system(str);

Now open and read the file, and obtain the original args (which will not
change even if your program screws up its stack and scribbles over everything).

This method while slow, might be interesting for printing a fatal error message
with some attribution.

Neil/.