Re: [Dps-devel] Building with XFree86 4.0.2?

[Kevin B. <Co...@co...>]

Juliusz Chroboczek wrote:
> 
> KB> That works fine.
> 
> Then I've got no idea what's going wrong.  The ``Hello'' message does
> appear, right?
> 

Yes, fonts seem to draw correctly.

> You may try uncommenting lines 274 and 275 in texteroids.c.
> 

No difference.

I built texteroids with debug, and it's hanging up in the pswrap for
GetInvCTM() in libc in a select() call.  


> KB> What do all the flush's do?  Are they required to see any errors
> KB> during dpsexec?
> 
> Not errors, only standard output.
> 
> KB> I noticed dpsexec only seems to print a prompt in some situations,
> KB> not after every 'Enter'.
> 
> In DPS, context output is buffered.  The executive (the thing you
> interact with in dpsexec) works by flushing output before printing
> every prompt.  The reason that works is that the executive does not
> interact with standard input, but with terminal input which gives it a
> chance to print a prompt once in a while.

Hmm, I'm a little lost here.  So... DPS passes the Postscripts tokens to
the interpreter immediately, right?  And executes them?  But any
response output from the interpreter may not appear until a flush?

Or are you saying that Postscripts tokens aren't passed to the
interpreter by DPS until a flush?  (Which doesn't match the behavior I'm
seeing...  But then again, I'm used to talking Postscript directly to a
printer, which doesn't do anything with tokens until you end a line or
use some other action which tells the interpreter to exec.)


> 
> I have not (yet?) implemented terminal input, but instead have made it
> an alias for terminal input.  So you need to type either ``flush'' or
> ``prompt'' once in a while to get the output flushed.
> 
> KB> But when I enter something that causes a stackunderflow or
> KB> nocurrentpoint error it prints the error and a prompt immediately.
> 
> The error handler runs a new instance of the executive which starts by
> calling ``prompt'' which in turn calls ``flush''.
> 
>                                         Juliusz