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Understanding the Linux Kernel, 3rd Edition by Marco Cesati, Daniel P. Bovet

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Chapter 11. Signals

Signals were introduced by the first Unix systems to allow interactions between User Mode processes; the kernel also uses them to notify processes of system events. Signals have been around for 30 years with only minor changes.

The first sections of this chapter examine in detail how signals are handled by the Linux kernel, then we discuss the system calls that allow processes to exchange signals.

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