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signal/termconstant
signal/killconstant
signal/intconstant
signal/hupconstant
signal/fpeconstant
signal/illconstant
signal/segvconstant
signal/abrtconstant
signal/trapconstant
signal/quitconstant
signal/alrmconstant
signal/vtalrmconstant
signal/profconstant
signal/ioconstant
signal/urgconstant
signal/chldconstant
signal/contconstant
signal/stopconstant
signal/tstpconstant
signal/pipeconstant
signal/xcpuconstant
signal/xfszconstant
signal/usr1constant
signal/usr2constant
signal/busconstant
signal/winchconstant
signal/breakconstant
signals-listconstant

These variables contain signal codes for use with process-signal, set-signal-handler!, signal-handler, signal-masked?, signal-mask!, or signal-unmask!.

NOTE: On native Windows builds (all except cygwin), only signal/term, signal/int, signal/fpe, signal/ill, signal/segv, signal/abrt, signal/break have an actual value. The others are all defined as zero, because those signals don't exist on Windows.

NOTE: On UNIX builds and cygwin, signal/break is defined as zero because it only exists on Windows.

To get a list of signals that are known to exist on the current platform, you can check signals-list which is a list of integers (signal numbers).