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This signal is usually generated only by explicit request. Since it cannot be handled,you should generate it only as a last resort,after first trying a less drastic method such asC-corSIGTERM. If a process does not respond to any other termination signals,sending it aSIGKILLsignal will almost always cause it to go away.
In fact,ifSIGKILLfails to terminate a process,that by itself constitutes an operating system bug which you should report.
The system will generateSIGKILLfor a process itself under some unusual conditions where the program cannot possible continue to run (even to run a signal handler).
intSIGHUP
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The
SIGHUP("hang-up") signal is used to report that the user's terminal is disconnected,perhaps because a network or telephone connection was broken. For more information about this,see section.
This signal is also used to report the termination of the controlling process on a terminal to jobs associated with that session; this termination effectively disconnects all processes in the session from the controlling terminal. For more information,see section.
intSIGALRM
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This signal typically indicates expiration of a timer that measures real or clock time. It is used by the
alarmfunction,for example.
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