CALL BPX1SPR, Select on a set of sockets +
(SOCKDESC, Input: Socket Descriptor +
SOCK#LEN+SOCK_SUN#LEN, Input: Length of socket address +
SOCKADDR, Input: Socket address +
SOCK#SO_SET, Input: Option - set the address +
RETVAL, Return value: 0 or -1 +
RETCODE, Return code +
RSNCODE), Reason code +
VL,MF=(E,PLIST) ----------------------------------