stdio - 1990-1991 Steve Summit
    reimplementated stdio, user-definable underlying I/O functions, improved
    error handling, new routines for "string" I/O, and efficient unbuffered
    I/O 

sfio - 1991-1998 David Korn and Kiem-Phong Vo, All rights reserved."
    beherscht alle features, schwaches layering, portable, fast

sio - 1993 Panos Tsirigotis
    kein socket support aber mmap

bstdio - 1993-1994 Chris Provenzano
    threadsafe stdio based on the BSD stdio, uses pthreads

buff - 1995-1999 Robert S Thau, Apache Group
    Apache Buffer and I/O library

substdio - Dan Berstein
    - minimalistic stdio

bio - 199x-1999 Eric A. Young
    BIO, sockets, memory, stacking

rt-aio - 1997 Ulrich Drepper
    pthread basierte Async IO von glibc