Re: [PARPORT] Handling interrupts with select and poll?

From: Bob Tanner (tanner@real-time.com)
Date: Thu May 01 2003 - 16:48:12 EDT

  • Next message: Nate Jenkins: "Re: [PARPORT] ioctl(parport, PPCLAIM) hangs?"

    On Thursday 01 May 2003 02:08 pm, Bob Tanner wrote:
    > Just want to confirm that the only want to handle interrupts is with select
    > or poll on the port.
    >
    > There isn't any sort of signals being sent by the libieee1284 or parport
    > that I could handle in my code.
    >
    > I don't see any in the code, but I want to post here for verification.

    % man ieee1284_read_status

    NOTES
           The nAck pin is often able to trigger interrupts on the
           host machine. With operating system help these interrupts
           may be visible to the application via the selectable_fd
           member of the parport structure.

           Under Linux, the conditions are that the parallel port
           driver knows which interrupt line to use and is using it,
           and that the relevant /dev/parport device node is accessi-
           ble and backed by a device driver.

    Look in parport.h, I do not see selectable_fd member of the in struct parport. 

    -- 
Bob Tanner <tanner@real-time.com>         | Phone : (952)943-8700
http://www.mn-linux.org, Minnesota, Linux | Fax   : (952)943-8500
Key fingerprint = AB15 0BDF BCDE 4369 5B42  1973 7CF1 A709 2CC1 B288

    --  To unsubscribe, send mail to: linux-parport-request@torque.net --
--  with the single word "unsubscribe" in the body of the message. --

    This archive was generated by hypermail 2b29 : Thu May 01 2003 - 16:49:33 EDT