The following is a demonstration of the sigdist.d script. Here we run sigdist.d, and in another window we kill -9 a sleep process, # ./sigdist.d Tracing... Hit Ctrl-C to end. ^C SENDER RECIPIENT SIG COUNT sched dtrace 2 1 sched bash 18 1 bash sleep 9 1 sched Xorg 14 55 We can see the signal sent from bash to sleep. We can also see that Xorg has recieved 55 signal 14s. a "man -s3head signal" may help explain what signal 14 is (alarm clock).