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FreeBSD Device Drivers
book

FreeBSD Device Drivers

by Joseph Kong
April 2012
Intermediate to advanced
352 pages
8h
English
No Starch Press
Content preview from FreeBSD Device Drivers

sysctl

As mentioned earlier, the sysctl interface is used to dynamically change or examine the kernel’s parameters, which includes device drivers. For example, some drivers let you enable (or disable) debug options using sysctls.

Note

This book was written under the assumption that you know how to work with sysctls; if you don’t, see the sysctl(8) manual page.

Unlike with previous topics, I’m going to take a holistic approach to explain sysctl. That is, I’m going to show an example first, and then I’ll describe the sysctl functions. I found this to be the easiest way to grok implementing sysctls.

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Publisher Resources

ISBN: 9781457166716Errata