integer SIGHUP
integer SIGINT
integer SIGQUIT
integer SIGKILL
integer SIGTERM
integer SIGUSR1
integer SIGUSR2
public __construct (unknown $signum)
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public __wakeup ()
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public close ([Throwable $error])
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public awaitSignal ()
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public static isSupported (unknown $signum)
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public static raise (unknown $signum)
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public static signal (unknown $pid, unknown $signum)
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