ESBBCALL(9F) Kernel Functions for Drivers ESBBCALL(9F)

esbbcall - call function when buffer is available

#include <sys/stream.h>
bufcall_id_t esbbcall(uint_t pri, void (*func)(void *arg),
     void(arg));

Architecture independent level 1 (DDI/DKI).

pri
Priority of allocation request (to be used by allocb(9F) function, called by esbbcall()).

func

Function to be called when buffer becomes available.

arg

Argument to func.

The esbbcall() function, like bufcall(9F), serves as a timeout(9F) call of indeterminate length. If esballoc(9F) is unable to allocate a message and data block header to go with its externally supplied data buffer, esbbcall() can be used to schedule the routine func, to be called with the argument arg when a buffer becomes available. The func argument can be a routine that calls esballoc(9F) or it may be another kernel function.

On success, a bufcall IDis returned. On failure, 0 is returned. The value returned from a successful call should be saved for possible future use with unbufcall() should it become necessary to cancel the esbbcall() request (as at driver close time).

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

allocb(9F), bufcall(9F), esballoc(9F), timeout(9F), datab(9S), unbufcall(9F)

Writing Device Drivers STREAMS Programming Guide

January 16, 2006 OmniOS