Symbol: ISSIG_FAST
usr/src/uts/common/os/watchpoint.c
739
rval = ((ISSIG_FAST(curthread, lwp, p, FORREAL))? 0 : 1);
usr/src/uts/common/sys/proc.h
540
#define ISSIG(t, why) ISSIG_FAST(t, ttolwp(t), ttoproc(t), why)