Manual Pages for UNIX Operating System command usage for man ldi_poll

Kernel Functions for Drivers                         ldi_poll(9F)



NAME
     ldi_poll - Poll a device

SYNOPSIS
     #include 



     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 block-
                                ing.


                  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 dev-
                                ice.


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


                  POLLRDBAND    Data  from  a  non-zero  priority
                                band  may  be read without block-
                                ing.


                  POLLWRNORM    Data  other  than  high  priority
                                data  may  be read without block-
                                ing.





SunOS 5.11          Last change: 3 June 2003                    1






Kernel Functions for Drivers                         ldi_poll(9F)



                  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, possi-
     ble 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.
















SunOS 5.11          Last change: 3 June 2003                    2