May I suggest "Advanced Programming in the UNIX Environment."  It was
written by Stevens, the man who illustrated TCP/IP. :-)  I think it's an
essential book for anyone who is developing in unix. 

Jeff

On Tue, 22 Jun 1999, Grant Stockly wrote:

> Date: Tue, 22 Jun 1999 23:42:17 -0800
> From: Grant Stockly <gussie@stockly.com>
> To: netbsd-help@netbsd.org, netbsd-users@netbsd.org
> Subject: File System Documenatation
> 
> Are there any documents which describe how all of the unix file system
> routines work?  What they expect from the user, what the return, how to
> binary read and write files, and other information like that.
> 
> Thanks for your time,
> Grant
>