The SENDREQ CPRB

The SENDREQ macro fills in a CPRB as shown in Table 1. The SENDREQ macro sends the CPRB to MVSSERV, which routes the CPRB to the requested server.

Table 1. CPRB Control Block for Sending a Request (SENDREQ)
Offset Dec(Hex)	Number of Bytes	Field Name	Contents
0(0)	1	CRBF1	The control block's version number (first four bits) and modification level number (last four bits).
1(1)	2		Reserved
3(3)	1	CRBF4	The type of request. X'01' indicates a service request. (X'03' indicates a define server (DEFSERV) request.)
4(4)	4	CRBCPRB	Control block identifier (‘CPRB’).
8(8)	8		Reserved
16(10)	8	CRBSNAME	The name of the requested server.
24(18)	2		Reserved
26(1A)	2	CRBFID	The ID number of the requested service function.
28(1C)	12		Reserved
40(28)	4	CRBRQDLN	The length of the request data.
44(2C)	4	CRBRQDAT	The address of the request data.
48(30)	4	CRBRPDLN	The length of the reply data (maximum length allowed by the invoker of SENDREQ).
52(34)	4	CRBRPDAT	The address of the buffer for reply data.
56(38)	4	CRBRQPLN	The length of the request parameters.
60(3C)	4	CRBRQPRM	The address of the request parameters.
64(40)	4	CRBRPPLN	The length of the reply parameters (maximum length allowed by the invoker of SENDREQ).
68(44)	4	CRBRPPRM	The address of the buffer for reply parameters.
72(48)	40		Reserved

For a list of return codes from the SENDREQ macro, see MVSSERV Return Codes.