Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!bionet!agate!saturn!polaris!brad
From: brad@polaris.ucsc.edu (Brad Smith)
Newsgroups: comp.unix.wizards
Subject: Re: Demand paged executables
Message-ID: <6211@saturn.ucsc.edu>
Date: 2 Feb 89 16:53:41 GMT
References: <409@lakart.UUCP> <7599@chinet.chi.il.us>
Sender: usenet@saturn.ucsc.edu
Reply-To: brad@polaris.UUCP (Brad Smith)
Organization: University of California, Santa Cruz
Lines: 17

Two questions/points on this:

	- Wouldn't there be some problems with other links to
	  a file being invalidated (pointing to the old version)
	  if the file was unlinked, a new inode allocated, and
	  a new link created to copy over an executing program?

	- It seems the reason for not locking shell scripts is
	  that virtual memory for the executable is not being
	  paged out of the file containing the script.  Some
	  program (typically a shell) is being run with the
	  contents of the script as input... or something to
	  that effect.

Brad Smith
CIS Board, UC Santa Cruz
brad@saturn.ucsc.edu