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### 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.