Re: asynchronous process management on WinWP; buffering problem?

[kgold <kgold@watson.ibm.com>]

The output buffering is a common problem.  For C and perhaps other 
languages, stdout is normally line buffered.  But when you pipe the 
output (like through emacs) it becomes fully buffered.  So you don't see 
the output until the buffer is full.

I don't know if there's a general solution.  If it's C and you have the 
source, this will fix it.

	setvbuf(stdout, _IONBF, 0);

Peter Tury wrote:
> I try to control program xxx on MS WinXP from EmacsW32 (cvs). xxx runs in
> DOS window normally and after a command it reads from stdin (until
> newline), handles the input and, after another command, writes result to
> stdout.
> 
> However it seems that some buffering (in Emacs? in MS Windows'
> stdin/stdout?) tries to kill me: I can't see the results (from stdout) in
> the associated buffer, only if it is long enough. At least it seems so: if
> I send many "\n"-s (to "generate" a lot of prompts (to fill up the
> buffer?)) then I get everything together after a while (of course, if I run
> the program normally (=in a DOS window) everything works fine)... I hope I
> could handle this through filter functions, but...