BPX1WRV (writev) example

The following code issues a writev for a socket. SOCKDESC was returned from a previous call to either BPX1SOC or BPX1ACP. For the callable service, see writev (BPX1WRV, BPX4WRV) — Write data from a set of buffers. For the data structures, see BPXYSOCK — Map SOCKADDR structure and constants and BPXYIOV — Map the I/O vector structure. AMODE 64 callers use BPX4WRV (writev) example.

                                              
         MVC   BUFFERA(16),=CL16'Here is the data'                      
         LA    R2,BUFFERA                                               
         ST    R2,IOV_BASE                                              
         MVI   IOV_LEN,16                                               
*                                                                       
         CALL  BPX1WRV,              Write from a vector of buffers    +
               (SOCKDESC,            Input: Socket Descriptor          +
               =A(1),                Input: Single element in iov      +
               IOV,                  Input: Iov containing info        +
               PRIMARYALET,          Input: Alet where iov resides     +
               PRIMARYALET,          Input: Alet of buffers for data   +
               RETVAL,               Return value: 0 or -1             +
               RETCODE,              Return code                       +
               RSNCODE),             Reason code                       +
               VL,MF=(E,PLIST)       ----------------------------------