README.txt
-- Mark Claypool, claypool@cs.wpi.edu


OVERVIEW

This code is designed to ascertain what happens when a process
receives a second (or more) signal before the current signal has been
handled.

ss.c - creates a signal handler (SIGHUP) and prints the pid.  If an
external process signals (HUP) the running process, it handles the
signal via a message and then sleeps before printing another message.


HYPOTHESIS

Upon multiple SIGHUPs, the expected outcome is that the subsequent
signals will be discarded, although it is possible that subsequent
signals would be queued.


RESULT

claypool 222 carbon=>>ss
Pid: 11866
Waiting for a signal...

Pid: 11866
Waiting for a signal...
                                     (Another window)
                                     kill -HUP 11866
                                     kill -HUP 11866
                                     kill -HUP 11866
                                     kill -HUP 11866
15:53:31 Received signal (1)!
15:53:36 Carry on.
15:53:36 Received signal (2)!
15:53:41 Carry on.
Waiting for a signal...


CONCLUSION

It appears that only 1 additional signal is queued, and the others are
discarded.  More investigation is needed to determine if this (i.e., a
signal queue of 2) is a system setting that can be changed.