status: withdrawn (2006/11/16)
This SRFI defines a simple, primitive I/O subsystem for Scheme that is intended to function as the lowest layer of a more comprehensive suite of I/O layers. It provides unbuffered I/O, and is close to what a typical operating system offers. Thus, its interface is suitable for implementing high-throughput and zero-copy I/O.
The Primitive I/O layer also allows clients to implement custom data sources and sinks via a simple interface.
Moreover, this SRFI defines a condition hierarchy specifying common I/O-related exceptional situations.
The Primitive I/O layer only handles blocking-I/O. Non-blocking and selective I/O is left for another SRFI.
This I/O layer was designed in conjunction with two other layers that can be built on top of it: SRFI 80 (Stream I/O) and SRFI 81 (Port I/O).