20.2 GENERAL TCP/IP AND RPC COMMUNICATIONSWarning, this section is full of technical jargon. This section explains concepts that are common to the UNIX operating system. Although, as an OVO administrator it is not necessary to become a UNIX guru, it is helpful to have an understanding of the UNIX operating system. In this section, we will take a high-level look at how the operating system facilitates process-to-process communications. UNIX maintains file descriptor values inside tables. Tables created for each user contain information on all open files. I/O is handled via file descriptors. File descriptors provide access to files (via information stored in the files' node). A pipe file appears as filetype "p" (lowercase letter "p"), and these files are used with function calls for inter-process communication. For example, check the pipe files in the temporary directory used during runtime by the OVO processes on management server with the command ls l /var/opt/OV /share/tmp/OpC/mgmt_sv . UNIX pipes allow processes to communicate. Pipes allow the output of one process to serve as input to another. There are many different forms of inter-process communications that are created using system calls.Appendix C for additional resources. |
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