What are 'signals' in C?

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Smita Santosh

Experienced Computer trainer having worked in IT sector for 20 years.

A signal is a software interrupt delivered to a process. The operating system uses signals to report exceptional situations to an executing program. Some signals report errors such as references to invalid memory addresses; others report asynchronous events, such as disconnection of a phone line.
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signal is a software generated interrupt that is sent to a process by the OS because of when user press ctrl-c or another process tell something to this process.
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