freebsd man page for esbbcall

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

NAME

       esbbcall - call function when buffer is available

SYNOPSIS

       #include <sys/stream.h>

       bufcall_id_t esbbcall(uint_t pri, void (*func)(void *arg), void (arg));

INTERFACE LEVEL

       Architecture independent level 1 (DDI/DKI).

PARAMETERS

       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.

DESCRIPTION

       esbbcall(),  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. func may be a routine that calls  esballoc(9F) or it may be another kernel function.

RETURN VALUES

       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).

CONTEXT

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

SEE ALSO

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

       Writing Device Drivers STREAMS Programming Guide

SunOS 5.10							     18 Feb 98							      esbbcall(9F)