MPE/iX - CI Programming for Stability

July 18, 2008 HP World '01 14
Entry points
• simple convention for executing the same UDC/script starting
in different “sections” or subroutines
• a UDC/script invokes itself recursively passing in the name of an
entry (subroutine) to execute
• the script detects that it should execute an alternate entry and
skips all the code not relevant to that entry.
• most useful when combined with I/O redirection, but can provide
the appearance of generic subroutines
• benefits are: fewer script files to maintain, slight performance
gain since MPE opens an already opened file faster, can use
variables already defined in script
• UDCs need OPTION RECURSION to use multiple entry points