Base resolver configuration files

The base resolver configuration file contains TCPIP.DATA statements. In addition to resolver directives, it is referenced to determine, among other things, the data set prefix (DATASETPREFIX statement’s value) to be used when trying to access some of the configuration files specified in this section.

The search order used to access the base resolver configuration file is the following:

  1. GLOBALTCPIPDATA

    If defined, the resolver GLOBALTCPIPDATA setup statement value is used (see also Understanding resolvers). The search continues for an additional configuration file. The search ends with the next file found.

  2. The value of the environment variable RESOLVER_CONFIG

    The value of the environment variable is used. This search will fail if the file does not exist or is allocated exclusively elsewhere.

  3. /etc/resolv.conf
  4. //SYSTCPD DD card

    The data set allocated to the DD name SYSTCPD is used. In the z/OS® UNIX environment, a child process does not have access to the SYSTCPD DD. This is because the SYSTCPD allocation is not inherited from the parent process over the fork() or exec function calls.

  5. userid.TCPIP.DATA

    userid is the user ID that is associated with the current security environment (address space, task, or thread).

  6. jobname.TCPIP.DATA

    jobname is the name specified on the JOB JCL statement for batch jobs or the procedure name for a started procedure.

  7. SYS1.TCPPARMS(TCPDATA)
  8. DEFAULTTCPIPDATA

    If defined, the resolver DEFAULTTCPIPDATA setup statement value is used (see also Understanding resolvers).

  9. TCPIP.TCPIP.DATA