nochpoll(9F)

NAME

     nochpoll - error return function for non-pollable devices

SYNOPSIS

     #include <sys/ddi.h>
     #include <sys/sunddi.h>

     int nochpoll(dev_t dev,  short  events,  int  anyyet,  short
     *reventsp, struct pollhead **pollhdrp);

INTERFACE LEVEL

     Solaris DDI specific (Solaris DDI).

PARAMETERS

     dev   Device number.

     events
           Event flags.

     anyyet
           Check current events only.

     reventsp
           Event flag pointer.

     pollhdrp
           Poll head pointer.

DESCRIPTION

     nochpoll() is  a  routine  that  simply  returns  the  value
     ENXIO. It is intended to be used in the cb_ops(9S) structure
     of a device driver for  devices  that  do  not  support  the
     poll(2) system call.

RETURN VALUES

     nochpoll() returns  ENXIO.

CONTEXT

     nochpoll() can be called from user or interrupt context.

SEE ALSO

     poll(2), chpoll(9E), cb_ops(9S)

     Writing Device Drivers