Re: Emacs doesn't show printf() output during debugging.

[Rolex JM]

I have tried
      setvbuf (stdout, (char *) NULL, _IONBF, 0);
and
      fflush(stdout);
respectively. They both worked. Thanks lot.

> From: Nick Roberts <nickrob@snap.net.nz>
> To: Lao JM <rolexletter@hotmail.com>
> CC: help-gnu-emacs@gnu.org
> Subject: Re: Emacs doesn't show printf() output during debugging.
> Date: Thu, 18 Aug 2005 09:29:57 +1200
>
>
> > When I debug my C program, I can't see the printf() output in any 
buffer.
> > However, I can provide input to scanf() in the GUD buffer. What should
> > I do to show the output? I am using Emacs 21.3.50.1 (CVS) on 
Windows2000.
> I don't debug on Windows but I have been told that this works:
>
> ;; If you are using Emacs and GDB on Windows you will need to flush the 
buffer
> ;; explicitly in your program if you want timely display of I/O in Emacs.
> ;; Alternatively you can make the output stream unbuffered, for example, 
by
> ;; using a macro:
> ;;
> ;;           #ifdef UNBUFFERED
> ;;           setvbuf (stdout, (char *) NULL, _IONBF, 0);
> ;;           #endif
> ;;
> ;; and compiling with -DUNBUFFERED while debugging.
>
> I think that if the string to be printed is terminated with \n, this will
> also display at the desired time (line buffering?).
>
> Nick

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