Signal

<operating system> A predefined message sent between two Unix processes or from the kernel to a process.

Signals communicate the occurrence of unexpected external events such as the forced termination of a process by the user.

Each signal has a unique number associated with it and each process has a signal handler set for each signal.

Signals can be sent using the kill {system call}.

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SIGBUS SIGhyper SIGLA SIGMA SIGNAL	56 kbps a56 A&B acoustic coupler addressed call mode	signalling rate Signalling System 7 signal-to-noise ratio signature sig quote