Ok, I think I found what you are looking for
getservbyname() - Get Port Number for Service Name
getservbyname_r() - Get Port Number for Service Name
getservbyport() - Get Service Name for Port Number
getservbyport_r() - Get Service Name for Port Number

If you need APIs to create your own then you'll have to read on your own.
I got you close enough.

Their documentation actually mentions things like:
Usage Notes
System i® Navigator or the following CL commands can be used to access
the services database file:
WRKSRVTBLE (Work with Service Table Entries)
ADDSRVTBLE (Add Service Table Entry)
RMVSRVTBLE (Remove Service Table Entry)

Rob Berendt

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