V3/usr/man/man2/fpe.2

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NAME		fpe -- set floating exception handling
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SYNOPSIS	sys fpe; arg / fpe = 40. not in assembler
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DESCRIPTION	This call
allows one to catch traps resulting from
floating point exceptions.
Arg___ is a location within the program; floating exception traps
are sent to that location.
The normal effect of floating exception traps may be restored by giving
an arg___ equal to 0.
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To return after catching the
fpe___
trap, execute the rti___ instruction.
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SEE ALSO	--
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DIAGNOSTICS	--
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BUGS		The
floating point exception (FEC) register
is not saved per process.
Examining this register for possible
remedial action after a floating point
exception trap is not guaranteed to work.