C Primer Plus®, Third Edition

Signal Handling: signal.h

A signal is a condition that can be reported during program execution. It is represented by a positive integer. The raise() function sends, or raises, a signal, and the signal() function sets the response to a particular signal.

The standard provides the macros listed in Table F.8 to represent possible signals; an implementation can add further values. They can be used as arguments to raise() and signal().

Table F.8. Signal macros.

Macro	Description
SIGABRT	Abnormal termination, such as initiated by a call to abort().
SIGFPE	Erroneous arithmetic operation.
SIGILL	Invalid function image (such as illegal instruction) detected.
SIGINT	Interactive attention signal received (such as a DOS interrupt).
SIGSEGV	Invalid access to storage. ...