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A signal reports the occurrence of an exceptional event. These are some of the events that can cause (or generate, or raise) a signal:
kill
or raise
by the same process.
kill
from another process. Signals are a limited but
useful form of interprocess communication.
Each of these kinds of events (excepting explicit calls to kill
and raise
) generates its own particular kind of signal. The
various kinds of signals are listed and described in detail in
Standard Signals.