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.
FILES
SEE_ALSO fptrap, the floating point package
DIAGNOSTICS
BUGS
OWNER ken, dmr