[GRASS5] G_sock_*, XDRIVER, and other fun...

[Markus Neteler]

On Mon, Feb 12, 2001 at 01:03:47PM -0800, Eric G . Miller wrote:
> On Mon, Feb 12, 2001 at 11:48:41AM +0000, Markus Neteler wrote:
> > Small idea to improve:
> > If you click-off a monitor and run d.rast (or whatever) later, you get:
> >   d.rast tk25
> >   Socket is already in use or not accepting connections.
> 
> Okay, I looked into this.  The problem is, most programs don't seem to
> check the return value of R_open_driver().  It returns a non-zero value
> if it fails.  Putting an exit() or similar into libraster would break
> d.mon's ability to report the status of all the drivers.  So, all d.*
> programs need to check that they actually were able to open the display
> driver (rather than just assuming).

Hi Eric,

this sounds like a bunch of work. Is there a chance to use an "intelligent"
script to exchange the R_open_driver() command by an improved call
to R_open_driver() with checking the exit status (hi script gurus!)?

> > This message might be extended: "Run d.mon to start new monitor.".
> > A problem is, that the message doesn't time-out. Means, you need to Ctrl-C
> > it away (funny: you have to hit return, before Ctrl-C is accepted). 
> > Could you use G_fatal_error() for this message?
> 
> d.rast get's hung because it tries to do drawing when there's nothing to
> draw to.  This is a module problem, not a library problem.
I see. Thanks for clarification.

 Markus

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