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a brief about 68000
linux programming interfaces
The Linux Programming Interface, by Michael Kerrisk, No Starch Press, ISBN 978-1593272203, 1552 pages, October 2010
This really heavy tome (1552 pages!) tries to explain each and every system call and system library you'll probably need some time or the other. While many of the content can be found in traditional manpages, the example code is quite nice as a reference implementation and helps to understand the topic explained - and if all else fails, throwing it hard enough at your computer/co-worker/boss will also solve a lot of problems (but will also create more severe ones).
You can find a Review at LWN.net