GETNAMEINFO

The GETNAMEINFO call returns the node name and service location of a socket address that is specified in the call. On successful completion, GETNAMEINFO returns the node and service named, if requested, in the buffers provided.

Table 1. GETNAMEINFO call requirements
Condition	Requirement
Authorization:	Supervisor state or problem state, any PSW key.
Dispatchable unit mode:	Task.
Cross memory mode:	PASN = HASN.
Amode:	31-bit or 24-bit. Note: See the addressability mode (Amode) considerations under CALL instruction API environmental restrictions and programming requirements.
ASC mode:	Primary address space control (ASC) mode.
Interrupt status:	Enabled for interrupts.
Locks:	Unlocked.
Control parameters:	All parameters must be addressable by the caller and in the primary address space.

Figure 1. GETNAMEINFO call instruction example

    WORKING-STORAGE SECTION.
        01  SOC-FUNCTION      PIC X(16)  VALUE IS 'GETNAMEINFO'.
        01  NAMELEN           PIC 9(8) BINARY.
        01  HOST              PIC X(255).
        01  HOSTLEN           PIC 9(8) BINARY.
        01  SERVICE           PIC X(32).
        01  SERVLEN           PIC 9(8) BINARY.
        01  FLAGS             PIC 9(8) BINARY VALUE 0.
        01  NI-NOFQDN         PIC 9(8) BINARY VALUE 1.
        01  NI-NUMERICHOST    PIC 9(8) BINARY VALUE 2.
        01  NI-NAMEREQD       PIC 9(8) BINARY VALUE 4.
        01  NI-NUMERICSERVER  PIC 9(8) BINARY VALUE 8.
        01  NI-DGRAM          PIC 9(8) BINARY VALUE 16.
        01  NI-NUMERICSCOPE   PIC 9(8) BINARY VALUE 32.




    * IPv4 socket structure.
        01  NAME.
            03  FAMILY      PIC 9(4) BINARY.
            03  PORT        PIC 9(4) BINARY.
            03  IP-ADDRESS  PIC 9(8) BINARY.
            03  RESERVED    PIC X(8).

    * IPv6 socket structure.
        01  NAME.
            03  FAMILY      PIC 9(4) BINARY.
            03  PORT        PIC 9(4) BINARY.
            03  FLOWINFO    PIC 9(8) BINARY.
            03  IP-ADDRESS.
                10 FILLER   PIC 9(16) BINARY.
                10 FILLER   PIC 9(16) BINARY.
            03  SCOPE-ID    PIC 9(8) BINARY.

        01  ERRNO           PIC 9(8) BINARY.
        01  RETCODE         PIC S9(8) BINARY.
 
    PROCEDURE DIVISION.

         MOVE 28 TO NAMELEN.
         MOVE 255 TO HOSTLEN.
         MOVE 32 TO SERVLEN.
         MOVE NI-NAMEREQD TO FLAGS.
         CALL 'EZASOKET' USING SOC-FUNCTION NAME NAMELEN HOST 
               HOSTLEN SERVICE SERVLEN FLAGS ERRNO RETCODE.