Lindy > ... they took long time to implement a resolver.
There has always been a "resolver" function in "TCP/IP for VM", "TCP/IP for MVS" and the IP component of z/OS Communications Server (CS) (CS IP). What you may have in mind is the introduction of the "resolver" *address space* in z/OS V1R2 CS IP. Since it is the responsibility of the manuals to explain such developments - maybe also the responsibility of folk playing the role of system programmers to discover such explanations! - here is what the z/OS V1R2 Communications Server IP Migration manual says about the introduction of the "resolver" *address space*: <quote> 4.2 Resolver Enhancements ... Prior to z/OS V1R2, the resolver function was implemented as part of the various socket APIs (Application Programming Interfaces) available on the z/OS platform. As a result, multiple versions of the resolver function were available, one for each type of socket API supporting resolver calls. All of these resolver libraries were quite similar in their support of resolver functions but had slight differences from an administrative and configuration perspective. For example, the resolver search logic to locate its configuration file (TCPIP.DATA file) varied depending on whether the application was using the TCP/IP provided Socket APIs or the C/C++ Socket API provided by the LE (Language Environment) component of z/OS. In z/OS V1R2, the various resolver libraries supported by the TCP/IP and LE APIs are now consolidated into a single resolver component. This allows consistent name resolution processing across all applications using the TCP/IP and LE socket APIs. The new consolidated resolver is automatically enabled on z/OS V1R2 and requires a new system address space that is automatically started during UNIX System Services initialization. The consolidated resolver offers several enhancements over previous releases: ... </quote> http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/f1a1b110/4.2 > If so, how were hostnames resolved? Well, it's not so and so the question becomes immaterial! Chris Mason On Wed, 7 Dec 2011 06:30:12 +0000, Lindy Mayfield <lindy.mayfi...@sas.com> wrote: >Interesting, if I am correct, they took long time to implement a resolver. If >so, how were hostnames resolved? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
