11-14-2005
UNIX supports about 30 signals, each with a unique integer code. You can program the current process to react to a particular signal in one of these ways.
React according to the default, which is to terminate, do nothing, or possibly dump core
Ignore the signal
Execute a user-supplied signal handler function
In addition, you can program the current process to block certain signals. Blocked signals are queued and only delivered if they are unblocked.
If you want a reminder of a timeout you can set the SIGALRM signal to the current process. Write a signal handler for the same and perform your operations there.
However there are two ways of implementing UNIX signal. SYSV and BSD style. The BSD style is more efficient.
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