example of memory send or receive signals
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One method of interprocess communication is to send and receive signals. A signal is a one-bit message (meaning "this signal happened") sent to a process from another process or from the kernel. Signals are numbered, usually from one to some small number like 15 or 31. Some signals have predefined meanings and are sent automatically to a process under certain conditions (such as memory faults or floating-point exceptions); others are strictly user-generated from other processes. Those processes must have permission to send such a signal. Only if you are the superuser or if the sending process has the same user ID as the receiving process is the signal permitted.
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