(libc.info.gz) Alarm Signals
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24.2.3 Alarm Signals
--------------------
These signals are used to indicate the expiration of timers.
Setting an Alarm, for information about functions that cause these
signals to be sent.
The default behavior for these signals is to cause program
termination. This default is rarely useful, but no other default would
be useful; most of the ways of using these signals would require handler
functions in any case.
-- Macro: int SIGALRM
This signal typically indicates expiration of a timer that measures
real or clock time. It is used by the 'alarm' function, for
example.
-- Macro: int SIGVTALRM
This signal typically indicates expiration of a timer that measures
CPU time used by the current process. The name is an abbreviation
for "virtual time alarm".
-- Macro: int SIGPROF
This signal typically indicates expiration of a timer that measures
both CPU time used by the current process, and CPU time expended on
behalf of the process by the system. Such a timer is used to
implement code profiling facilities, hence the name of this signal.
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