On Thu, 4 Feb 2021 at 12:25, Joe DeChirico <[email protected]> wrote:
> Is there any information available on the relationship between TCP/IP and > OMVS? I'm not sure if I (or others) fully understand your question. But one way of looking at it is to say that any TCP/IP implementation is really just a Physical File System (PFS) - AKA Installable File System - that plugs into the back end of the more general UNIX file system scheme. This is described in extreme detail in the book z/OS UNIX System Services File System Interface Reference, which you can find as a PDF or in the Knowledge Center. This diagram (called Figure 1) https://www.ibm.com/support/knowledgecenter/SSLTBW_2.4.0/com.ibm.zos.v2r4.bpxb500/bpx1fr_System_structure.htm provides a good overview. A TCP/IP implementation is one of the Physical File Systems (actually a Physical Socket System, but they don't use that phrase) in the lower left corner. For purposes of this diagram, any program running on z/OS that uses TCP/IP is in the box in the top left called "z/OS UNIX Programs". There can be as many PFSs as you like, and they can run either in the UNIX kernel or in a separate address space. Of course it's not "normal" to write your own physical file or socket system, but it can be done. Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
