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Chapter 12. Anti-Tampering > Detecting Unix Debuggers
Recipe 12.13. Detecting Unix Debuggers
12.13.1. Problem
You need to prevent someone from debugging a Unix binary.
12.13.2. Solution
Single-stepping through code in a Unix environment causes a SIGTRAP to be sent to the process. The debugger captures this signal and allows the user to examine the state of the process before continuing execution. By installing a SIGTRAP handler and sending itself a SIGTRAP, the process can determine whether it is being debugged.
