Re: rc,linux,signal,readline

[Paul Haahr <haahr@netcom.com>]

> >  	I have been trying for a while now to get the following 
> >  	working under linux..without success..
> >  
> >  	a _dynamically linked_ rc shell with;
> 
> I have sent patches to the list which take care of all the rest of
> your requests, but for some reason the shared/dynamic version of GNU
> readline doesn't work like the static version.  At least thats my
> first guess as to the problem.  Without readline it works "properly"
> and trips clean when linked dynamically.  With readline it doesn't.

Could it be that you're getting the wrong readline.so?  There were real
changes between the 1.x and 2.x versions, as I remember.

> The size of the statically linked image is with readline unde RedHat
> Linux 4.2 is 308264 bytes, actually slighty bigger than dynamically
> linked bash at 300668.  On the other hand I think it was Chris (cks)
> (or maybe Paul) who once gave some good reasons why a shell should be
> statically linked.

I probably said something along those lines, back in the days when we
worried about the startup time.  10x performance improvement moots the
issue for me.

You should have *some* shell, typically lying around in /sbin these
days, which is not dynamically linked, for those times when everything
else is broken.  If rc is your root shell, then making it statically
linked is probably a good idea.

--p