The socket calls

Socket calls are shown in Steps 1 and 2 in Figure 1.

The socket API is available in the C language and in COBOL, PL/I, or assembler language. It includes the following socket calls:

Call type	IP CICS® TCP API function
Basic calls:	`ACCEPT, BIND, CLOSE, CONNECT, LISTEN, SHUTDOWN`
Read/Write calls:	`READ, READV, RECV, RECVFROM, RECVMSG, SEND, SENDMSG, SENDTO, WRITE, WRITEV`
Advanced calls:	`FCNTL, FREEADDRINFO, GETADDRINFO, GETHOSTBYADDR, GETHOSTBYNAME, GETHOSTNAME, GETNAMEINFO, GETPEERNAME, GETSOCKNAME, GETSOCKOPT, IOCTL, NTOP, PTON, SELECT, SELECTEX, SETSOCKOPT`
IBM-specific calls:	`GETCLIENTID, GIVESOCKET, INITAPI, INITAPIX, TAKESOCKET`

Figure 1. How user applications access TCP/IP networks with CICS TCP/IP (run-time environment)

CICS TCP/IP provides for both connection-oriented and connectionless (datagram) services. CICS does not support the IP (raw socket) protocol.