NOCHPOLL(9F) Kernel Functions for Drivers 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

illumos DDI specific (illumos DDI).

PARAMETERS

dev
Device number.


events
Event flags.


anyyet
Check current events only.


reventsp
Event flag pointer.


pollhdrp
Poll head pointer.

DESCRIPTION

The nochpoll() function 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

The nochpoll() function returns ENXIO.

CONTEXT

The nochpoll() function can be called from user, interrupt, or kernel
context.

SEE ALSO

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


Writing Device Drivers

January 16, 2006 NOCHPOLL(9F)