Starts a write to the specified IO buffer block.
char* INKIOBufferBlockWriteStart (INKIOBufferBlock
blockp
, int
*avail
)
Gets the start point for writing into the IO buffer block
. The amount of
data available for writing is stored in the parameter
blockp
. If
avail
is
avail
NULL
, then no attempt is made to dereference
it.
A pointer to the starting point for writing to the specified IO buffer block.
INK_ERROR_PTR
if an error occurs.