(libc.info.gz) Standard Signals

(libc.info.gz) Concepts of Signals

 
 24.2 Standard Signals
 =====================
 
 This section lists the names for various standard kinds of signals and
 describes what kind of event they mean.  Each signal name is a macro
 which stands for a positive integer--the "signal number" for that kind
 of signal.  Your programs should never make assumptions about the
 numeric code for a particular kind of signal, but rather refer to them
 always by the names defined here.  This is because the number for a
 given kind of signal can vary from system to system, but the meanings of
 the names are standardized and fairly uniform.
 
    The signal names are defined in the header file `signal.h'.
 
  -- Macro: int NSIG
      The value of this symbolic constant is the total number of signals
      defined.  Since the signal numbers are allocated consecutively,
      `NSIG' is also one greater than the largest defined signal number.

 
* Program Error Signals       Used to report serious program errors.
* Termination Signals         Used to interrupt and/or terminate the
                                  program.
* Alarm Signals               Used to indicate expiration of timers.
* Asynchronous I/O Signals    Used to indicate input is available.
* Job Control Signals         Signals used to support job control.
* Operation Error Signals     Used to report operational system errors.
* Miscellaneous Signals       Miscellaneous Signals.
* Signal Messages             Printing a message describing a signal.

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