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biosize - returns size of a buffer structure

#include <sys/ddi.h>
#include <sys/sunddi.h>

size_t biosize(void)

illumos DDI specific (illumos DDI). The biosize() function returns the size in bytes of the buf(9S) structure. The biosize() function is used by drivers in combination with kmem_alloc(9F) and bioinit(9F) to allocate buffer structures embedded in other data structures. The biosize() function can be called from any context. biofini (9F), bioinit (9F), getrbuf (9F), kmem_alloc (9F), buf (9S)

Writing Device Drivers