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Path: utzoo!linus!philabs!cmcl2!seismo!elsie!ado
From: ado@elsie.UUCP (Arthur David Olson)
Newsgroups: net.bugs.4bsd
Subject: 4.[123]bsd sh misnames temporary files (with fix)
Message-ID: <6024@elsie.UUCP>
Date: Sun, 23-Feb-86 13:56:12 EST
Article-I.D.: elsie.6024
Posted: Sun Feb 23 13:56:12 1986
Date-Received: Wed, 26-Feb-86 04:57:36 EST
Organization: NIH-LEC, Bethesda, MD
Lines: 35
Keywords: bsd sh

Index:	    bin/sh/main.c Fix

Description:
	Temporary files created by /bin/sh are given names of the form
		/tmp/sh$$$serial
	where "$$" above is the process identifier of the shell and "$serial"
	is a serial number that starts at zero.  This means that the first
	temporary file created by process number 321 is given the same name as
	the eleventh temporary file created by process 32--with potentially
	disastrous results.

Repeat-By:
	The light of a blue moon.

Fix:
	Use the form
		/tmp/sh$$.$serial
	for temporary file names.  Here's one way to do it with the 4.1bsd
	version of "sh/main.c", an addition conditionally compiled based on
	"OLDVERSION" (where, as usual, the trade secret status of the code
	involved precludes a clearer posting):

		settmp()
		{
			itos(getpid()); serial=0;
			tmpnam=movstr(numbuf,&tmpout[TMPNAM]);
		#ifndef OLDVERSION
			tmpnam = movstr(".", tmpnam);
		#endif
		}
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