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sys-ilgins(2) - Unix First Edition Manual Page
11/3/71SYS_ILGINS (II)

NAME ilgins -- catch illegal instruction trap
SYNOPSIS sys ilgins; arg / ilgins = 33.; not in assembler
DESCRIPTION ilgins allows a program to catch illegal instructiontraps. If arg is zero, the normal instruction trap

handling is done: the process is terminated and a coreimage is produced. If arg is a location within the program, control is passed to arg when the trap occurs. This call is used to implement the floating pointsimulator, which catches and interprets 11/45 floating point instructions.
SEE_ALSO fptrap, the floating point package
OWNER ken, dmr