ldi_poll

- Poll a device

Synopsis

#include <sys/sunldi.h>

int ldi_poll(ldi_handle_t lh, short events, int anyyet, short *reventsp,
     struct pollhead **phpp);

Parameters

lh

Layered handle.

events

Potential events. Valid events are:

POLLIN

Data other than high priority data may be read without blocking.

POLLOUT

Normal data may be written without blocking.

POLLPRI

High priority data may be received without blocking.

POLLHUP

Device hangup has occurred.

POLLERR

An error has occurred on the device.

POLLRDNORM

Normal data (priority band = 0) may be read without blocking.

POLLRDBAND

Data from a non-zero priority band may be read without blocking.

POLLWRNORM

Data other than high priority data may be read without blocking.

POLLWRBAND

Priority data (priority band > 0) may be written.

anyyet

A flag that is non-zero if any other file descriptors in the pollfd array have events pending. The poll(2) system call takes a pointer to an array of pollfd structures as one of its arguments. See poll(2) for more details.

reventsp

Pointer to a bitmask of the returned events satisfied.

phpp

Pointer to a pointer to a pollhead structure.

Description

The ldi_poll() function passes a poll request to the device entry point for the device specified by the layered handle. This operation is supported for block, character, and streams devices.

Return Values

The ldi_poll() function returns 0 upon success. If a failure occurs before the request is passed on to the device, possible return values are:

EINVAL

Invalid input parameters.

ENOTSUP

Operation is not supported for this device.

Context

These functions may be called from user or kernel context.