Trapping signals in a Swift command line application

by

Dispatch Sources
can be used to monitor UNIX signals.

Here is a simple example, a Swift 3 translation of the C code in the
“Monitoring Signals” section from the Concurrency Programming Guide.

import Dispatch // or Foundation

signal(SIGINT, SIG_IGN) // // Make sure the signal does not terminate the application.

let sigintSrc = DispatchSource.makeSignalSource(signal: SIGINT, queue: .main)
sigintSrc.setEventHandler {
    print("Got SIGINT")
    // ...
    exit(0)
}
sigintSrc.resume()

Note that this requires an active GCD event loop, e.g. with

dispatchMain()

in a command-line program.

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