Re: problems with USB/CDC serial (umodem) - devices work with Linux, Mac OS X, and FreeBSD, but not NetBSD

[mlelstv%serpens.de@localhost (Michael van Elst)]

robthedude%mac.com@localhost (Rob Newberry) writes:

>But the â??readâ?? call takes 25 seconds or more!

That's your application.

If configured with ",default" it sets all control characters to
_POSIX_VDISABLE, including the 'VMIN' and 'VTIME' characters.

socket-utils.c:889

	FETCH_TERMIOS();
	for (i=0; i < NCCS; i++) {
		tios.c_cc[i] = _POSIX_VDISABLE;
	}

but

     If the value of one of the changeable special control characters (see
     Special Characters) is {_POSIX_VDISABLE}, that function is disabled; that
     is, no input data is recognized as the disabled special character.  If
     ICANON is not set, the value of {_POSIX_VDISABLE} has no special meaning
     for the VMIN and VTIME entries of the c_cc array.

_POSIX_VDISABLE is '\377', so your read waits for 255 chars and times
out after 255 tenth of a second.


Greetings,
-- 
-- 
                                Michael van Elst
Internet: mlelstv%serpens.de@localhost
                                "A potential Snark may lurk in every tree."