CommandLineToolkit

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import Foundation
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public enum LaunchdSocketActivation {
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    /// Read `man launch_activate_socket`.
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    /// - Parameter name: The name of the socket entry in the service's Sockets dictionary.
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    /// - Throws:`LaunchdSocketActivationError`
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    /// - Returns: a set of file descriptors corresponding to a socket service that launchd(8) has created and advertised on behalf of the job
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    public static func activateSocket(name: String) throws -> [Int32] {
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#if os(macOS)
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        var ld_sockets = UnsafeMutablePointer<Int32>.allocate(capacity: 0)
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        defer {
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            ld_sockets.deallocate()
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        }
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        var count: size_t = 0
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        let err = launch_activate_socket(name, &ld_sockets, &count)
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        guard err == 0 else {
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            throw LaunchdSocketActivationError.errorCode(err)
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        }
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        var fds = [Int32]()
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        for i in 0 ..< count {
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            fds.append(ld_sockets[i])
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        }
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        return fds
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#else
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        return []
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#endif
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    }
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}
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