handle
libraw1394 handle
node
target node ID
addr
address to read from
extcode
extended transaction code determining the lock operation
data
data part of lock parameters
arg
arg part of lock parameters
result
address where return value will be written
tag
data to identify the request to completion handler
This function starts the specified lock request.
The transaction is only started, no success of the transaction is implied
with a successful return of this function. When the transaction completes, a
raw1394_loop_iterate
will call the tag handler and pass it the tag and
error code of the transaction. tag
should therefore be set to something
that uniquely identifies this transaction (e.g. a struct pointer casted to
unsigned long).