From: Phil Pennock <phil@athenaeum.demon.co.uk>
To: zsh-users@math.gatech.edu
Subject: Re: Redirecting variable fds
Date: Fri, 11 Dec 1998 08:05:58 +0000 [thread overview]
Message-ID: <19981211080558.46630@athenaeum.demon.co.uk> (raw)
In-Reply-To: <5laf0vpqfh.fsf@tequila.cs.yale.edu>; from "Stefan Monnier" on Thu 10 Dec 1998 (17:45 -0500)
I may have stumbled across a bug. I think the zsh-developers list might
be getting sick of my bug reports.
Typing away merrily, Stefan Monnier produced the immortal words:
> The parsing is done before the parameter expansion so you're screwed.
> But there's a workaround, using eval:
function bar {
> DEBUGMEM_INFOFD=$1 LD_PRELOAD=./bar.so eval $argv[3,-1] "$1>$2"
}
> It's not quite correct in that the content of $argv[3,-1] should be escaped
> to prevent its evaluation ( la "$@"), but my zsh expertise is lacking here.
Ah, thanks.
By the "$@" bit, it looks as though you're trying for "${(@)argv[3,-1}"
which doesn't on its own stop globbing. I've handled that by changing
the 'eval ' for 'eval noglob '. So now quoted args behave as expected
and unquoted ones are expanded at function-call time.
The problem is that DEBUGMEM_INFO and LD_PRELOAD don't actually make it
into the environment. Using 'env' as the command passed through, I can
see quite plainly that they aren't there. But using env to place the
values into the environment works:
function bar {
eval noglob env DEBUGMEM_INFOFD=$1 LD_PRELOAD=./bar.so "${(@)argv[3,-1]} "$1>$2"
}
Trying this:
% FOO=x eval sh -c 'echo $FOO'
and then without the eval, it seems the eval loses the auto-export
functionality, in both 3.0.5 and 3.1.5. It doesn't appear to be
documented though.
Bug?
--
--> Phil Pennock ; GAT d- s+:+ a22 C++(++++) UL++++/I+++/S+++/H+ P++@ L+++
E-@ W(+) N>++ o !K w--- O>+ M V !PS PE Y+ PGP+ t-- 5++ X+ R !tv b++>+++ DI+ D+
G+ e+ h* r y?
prev parent reply other threads:[~1998-12-11 8:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-12-10 21:52 Phil Pennock
1998-12-10 22:45 ` Stefan Monnier
1998-12-11 8:05 ` Phil Pennock [this message]
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