oktw says to #ysitdSIGKILL and SIGSTOP cannot be caught, blocked, or ignored. Next the signals not in the POSIX.1-1990 standard but described in SUSv2 and POSIX.1-2001. Signal Value Action Comment ──────────────────────────────────────────────────────────────────── SIGBUS 10,7,10at Fri, Jan 15, 2016 6:00 PM