Where can I find more information on the OSI STREAMS interfaces?

This OpenSS7 STREAMS implementation has been fashioned of the work done in the early 90's by the OSI Special Interest Group and published by UNIX International, Inc. Because these specifications are freely available, you can download a copy of them here for reference as follows:

STREAMS Interface Documentation

	Document	PDF File	PS File	Size (bytes)
DLPI	Data Link Provider Interface Specification	dlpi.pdf	dlpi.pdf.gz	459757
NPI	Network Provider Interface Specification	npi.pdf	npi.pdf.gz	317888
TPI	Transport Provider Interface Specification	tpi.pdf	tpi.pdf.gz	121886