developerWorks: Signals as a Linux Debugging Tool
Dec 02, 2005, 05:30 (0 Talkback[s])
(Other stories by Madhavan Srinivasan)
"Signals are software interrupts that send information about an
occurrence of an asynchronous event to an executing program, or
process. Signals are generated for a variety of reasons such as
timer expiration. Most hardware traps--illegal instructions, access
to invalid addresses, and so on--are converted to signals.
"Signals can be generated by the process itself, or they can be
sent from one process to another. A variety of signals can be
generated or delivered, and they have many uses for programmers.
(To see a complete list of signals in the Linux environment, use
the command kill -l.)