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Re: Console client plug-in options

From: Jeroen Dekkers
Subject: Re: Console client plug-in options
Date: Fri, 8 Aug 2003 14:06:13 +0200
User-agent: Mutt/1.5.4i

On Thu, Aug 07, 2003 at 11:48:41PM +0200, Marco Gerards wrote:
> Already tried to use an argp parser, and that worked. Unfortunately
> there were issues with the argp parser, argp isn't reentrant. (I guess
> I was lucky when I used it).

Hmm, I don't see a reason why this wouldn't work. The problem is when
different threads use argp at the same time, but this can't happen
with the locks protecting argp. These locks are recursive, recursively
calling argp doesn't cause a deadlock.

Of course the getopt interface uses some global variables: opterr,
optopt, optind and optarg. optopt and optind are set everytime before
calling getopt() and only used just after that, so that doesn't give
any trouble. optarg is just is used just after getopt() and points
into argv itself and not some statically allocated buffer, I don't see
any trouble here either. The only problem is opterr: It's set only
when initializing argp. So as long as you don't use ARGP_NO_ERRS (the
only flag which changes opterr) in the one and not in the other it
shouldn't cause a problem AFAICS.

Jeroen Dekkkers

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