(libc.info.gz) Signal Handling

 
 24 Signal Handling
 ******************
 
 A "signal" is a software interrupt delivered to a process.  The
 operating system uses signals to report exceptional situations to an
 executing program.  Some signals report errors such as references to
 invalid memory addresses; others report asynchronous events, such as
 disconnection of a phone line.
 
    The GNU C Library defines a variety of signal types, each for a
 particular kind of event.  Some kinds of events make it inadvisable or
 impossible for the program to proceed as usual, and the corresponding
 signals normally abort the program.  Other kinds of signals that report
 harmless events are ignored by default.
 
    If you anticipate an event that causes signals, you can define a
 handler function and tell the operating system to run it when that
 particular type of signal arrives.
 
    Finally, one process can send a signal to another process; this
 allows a parent process to abort a child, or two related processes to
 communicate and synchronize.

 
* Concepts of Signals         Introduction to the signal facilities.
* Standard Signals            Particular kinds of signals with
                                  standard names and meanings.
* Signal Actions              Specifying what happens when a
                                  particular signal is delivered.
* Defining Handlers           How to write a signal handler function.
* Interrupted Primitives      Signal handlers affect use of 'open',
 				 'read', 'write' and other functions.
* Generating Signals          How to send a signal to a process.
* Blocking Signals            Making the system hold signals temporarily.
* Waiting for a Signal        Suspending your program until a signal
                                  arrives.
* Signal Stack                Using a Separate Signal Stack.
* BSD Signal Handling         Additional functions for backward
 			         compatibility with BSD.

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