🚀 go-pugleaf

In article <1992Nov11.224715.12841@cs.tu-berlin.de> marcel@opal.cs.tu-berlin.de (Marcel Weiher) writes:
>If you want exact control over the serial lines, don't use buffered
>I/O ( fopen,fclose,getchar,feof) but UNIX system calls like open,
>write,read and:  ioctl().

Yes, and in particular:
	int nchar;
	ioctl(ttyfd,FIONREAD,&nchar);
will place the number of characters "immediately" available
to be read on the file descriptor "ttyfd" (which may be zero)
into "nchar".

If you're using the appkit, you could alternatively use DPSAddFD
to cause the kit to call your own function whenever characters are
available to be read.  (I assume it just arranges calls ioctl,
as above, for you whenever you go for a new event).
-- 
Ray Spalding, Office of Information Technology
Georgia Institute of Technology, Atlanta Georgia, 30332-0715
Internet: ray.spalding@oit.gatech.edu (NeXT Mail accepted)