Re: USB, select/poll for ucom

From: Danny Braniss (danny_at_cs.huji.ac.il)
Date: 06/25/03

  • Next message: Varshavchick Alexander: "Re: How to delete unix socket entries" 
    To: ticso@cicely.de
Date: Wed, 25 Jun 2003 15:27:30 +0300

    > On Wed, Jun 25, 2003 at 01:13:56PM +0300, Danny Braniss wrote:
    > > hi,
    > > while trying to port an application that works with tty to uplcom/ucom,
    > > (and it doesn't work :-), and looking at the kernel sources and
    > > trying to figure out USB, i think that select(2)/poll(2) will not work,
    > > correct?
    >
    > I've seen Problemes with non 8n1 communications and I've also seen
    > problems because most USB adapters only deliver 5.5V to the lines.
    > I never noticed any select/poll problems and I don't think we have any
    > because this is handled in common code at tty level.
    >
    > If you have any condition that shows something different please let
    > us know.
    >

    i turned debug on and i could not see any calls to ucomread,
    the program calls select(...) - but select does not initiate anything,
    it justs waits to be woken when something is received (in the case of reading),
    now, unless im wrong - which well could be :-), the read in this case must be
    started - usb is a master/slave protocol, and this is not happening.

            if(select(fdset,...)) {
                    if(FD_ISSET(ifd, fdset))
                            read(ifd, ...
                    ...
            }
    danny
    PS: im using 5.1-current, and im trying to get a Towitoko smartcard reader to
        work.

    _______________________________________________
    freebsd-hackers@freebsd.org mailing list
    http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
    To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org"

  • Next message: Varshavchick Alexander: "Re: How to delete unix socket entries"