For more than twenty years, serious C programmers have relied on one book for practical, in-depth knowledge of the programming interfaces that drive the UNIX and Linux kernels: W. Richard Stevens’ Advanced Programming in the UNIX® Environment . Now, once again, Rich’s colleague Steve...

pfSense is an open source distribution of FreeBSD-based firewall which provides a platform for flexible and powerful routing and firewalling. The versatility of pfSense presents us with a wide array of configuration options which, compared to other offerings, makes determining requirements a little more difficult and a lot more important....

The FreeBSD Handbook is a comprehensive FreeBSD tutorial and reference. It covers installation, day-to-day use of FreeBSD, and much more, such as the Ports collection, creating...

There's only so much you can do by multitasking applications. Frequently, you just need another computer for testing software, trying out network configurations, or doing any of a dozen things that engineers and administrators need to do. VMware allows you to run several virtual machines on one physical computer, each completely...

In early 2004, DTrace remained nascent; while Mike Shapiro, Adam Leventhal, and I had completed our initial implementation in late 2003, it still had substantial gaps (for example, we had not yet completed user-level instrumentation on x86), many missing providers, and many features yet to...