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

From: Bob Tanner (tanner@real-time.com)
Date: Fri May 02 2003 - 15:49:47 EDT

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    On Friday 02 May 2003 03:20 am, Tim Waugh wrote:
    > On Thu, May 01, 2003 at 03:48:12PM -0500, Bob Tanner wrote:
    > > 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.
    >
    > Look in ieee1284.h.

    I must be getting old :-)

    From ieee1284.h:

    /* A parallel port. */
    struct parport {
      /* An arbitrary name for the port */
      const char *name;

      /* The base address of the port, if that has any meaning, or zero. */
      unsigned long base_addr;

      /* The ECR address of the port, if that has any meaning, or zero. */
      unsigned long hibase_addr;

      /* For internal use only: */
      void *priv;
    };

    Which of these fields is the selectable_fd member? 

    -- 
Bob Tanner <tanner@real-time.com>         | Phone : (952)943-8700
http://www.mn-linux.org, Minnesota, Linux | Fax   : (952)943-8500
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