trap
trap( signal, cmd ) -> anObject
trap( signal ) {| | block } -> anObject


Specifies the handling of signals. The first parameter is a signal name (a string such as ``SIGALRM'', ``SIGUSR1'', and so on) or a signal number. The characters ``SIG'' may be omitted from the signal name. The command or block specifies code to be run when the signal is raised. If the command is the string ``IGNORE'' or ``SIG_IGN'', the signal will be ignored. If the command is ``DEFAULT'' or ``SIG_DFL'', the operating system's default handler will be invoked. If the command is ``EXIT'', the script will be terminated by the signal. Otherwise, the given command or block will be run.

The special signal name ``EXIT'' or signal number zero will be invoked just prior to program termination.

trap returns the previous handler for the given signal.

trap 0, proc { puts "Terminating: #{$$}" }
trap("CLD") { puts "Child died" }
fork && Process.wait

produces:

Terminating: 1425
Child died
Terminating: 1424

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