1. Enhanced library for managing I/O streams. Sfio is a portable library for managing I/O streams. It provides similar functionality to the ANSI C Standard I/O functions known collectively as Stdio. However, it has a distinct interface and is generally faster and more robust than most Stdio implementations. Sfio also introduces a number of new features and concepts beyond Stdio stream I/O processing. From Debian 3.0r0 APT