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/*
This source file is part of the Swift.org open source project
Copyright (c) 2021 Apple Inc. and the Swift project authors
Licensed under Apache License v2.0 with Runtime Library Exception
See https://swift.org/LICENSE.txt for license information
See https://swift.org/CONTRIBUTORS.txt for Swift project authors
*/
import Foundation
/// A handler that intercepts system signal-events.
#if !os(Windows)
public struct Signal {
/// List of all system signals that interrupt the program execution.
public static let all = [SIGHUP, SIGINT, SIGQUIT, SIGABRT, SIGKILL, SIGALRM, SIGTERM]
/// Intercepts the given list of signals and invokes `callback` instead of interrupting execution.
public static func on(_ signals: [Int32], callback: @convention(c) @escaping (Int32) -> Void) {
var signalAction = sigaction()
#if os(Linux)
// This is where we get to use a triple underscore in a method name.
signalAction.__sigaction_handler = unsafeBitCast(callback, to: sigaction.__Unnamed_union___sigaction_handler.self)
#elseif os(Android)
signalAction.sa_handler = callback
#else
signalAction.__sigaction_u = unsafeBitCast(callback, to: __sigaction_u.self)
#endif
withUnsafePointer(to: &signalAction) { (pointer) in
for signal in signals {
sigaction(signal, pointer, nil)
}
}
}
}
#endif
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