Is there a listing of the POSIX API / functions?

Question

I'm trying to find out where I can find documentation on POSIX functions, but coming up short. Any recommendations?

EDIT: I asked this because we're strictly limited to POSIX compliant functions for this assignment.

Answer 1

POSIX 1003.1-2008 is now available on the web (all 3872 pages of it, in PDF and HTML). You have to register (free). I got to it from the Open Group Bookstore.

See How to Portably scanf into a pid_t in C for my original answer that included this information.

Answer 2

Strictly speaking, the definitive list of the POSIX functions is the POSIX standards documents themselves.

There's a pretty good introduction to what POSIX is all about, with links to plenty of reference material on Wikipedia.