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.

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.

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).

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

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

Writing Device Drivers STREAMS Programming Guide