BPX1SRX (srx_np) example

srx_np callable service sends or receives data on a socket using CSM buffers. The following example receives data into CSM buffers. The MSGXNAMEPTR is set up to point to a buffer to receive the source address of the data. The MSGXIOVX is an IVTBUFL structure, which describes an IOVX array in a CSM buffer. The IOVX array contains IVTBUFL structures, each of which describes a CSM buffer with data that was received. SOCKDESC is a socket descriptor that was returned from a previous call to either BPX1SOC or BPX1ACP. For the data structures, see BPXYSOCK — Map SOCKADDR structure and constants and BPXYMSGX — Map the message header. For the callable service, see srx_np (BPX1SRX, BPX4SRX) — Send or receive CSM buffers on a socket. AMODE 64 callers use BPX4SRX (srx_np) example.

                                              
         XC    MSGX(MSGX#LEN),MSGX   Clear msgx storage                 
         LA    R2,SOCKADDR                                              
         ST    R2,MSGXNAMEPTR        Store the address of sockaddr      
         LA    R2,SOCK#LEN+SOCK_SIN#LEN                                 
         ST    R2,MSGXNAMELEN        Length of sockaddr buffer          
         SPACE ,                                                        
         CALL  BPX1SRX,              Receive data in CSM buffers       +
               (SOCKDESC,            Input: Socket Descriptor          +
               MSGX_RECV,            Input: Direction                  +
               L'MSGX,               Input: Msghdrx length             +
               MSGX,                 Input: Msghdrx                    +
               RETVAL,               Return value: -1 or bytes read    +
               RETCODE,              Return code                       +
               RSNCODE),             Reason code                       +
               VL,MF=(E,PLIST)       ----------------------------------