(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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