* Alarm Signals:: Used to indicate expiration of timers.
* Asynchronous I/O Signals:: Used to indicate input is available.
* Job Control Signals:: Signals used to support job control.
-* Miscellaneous Signals:: Miscellaneous Signals
-* Nonstandard Signals:: Implementations can support other signals.
+* Operation Error Signals:: Used to report operational system errors.
+* Miscellaneous Signals:: Miscellaneous Signals.
* Signal Messages:: Printing a message describing a signal.
Specifying Signal Actions