`signal` action constants

The action taken when the interrupt signal is received depends on the value of func.

Syntax

#include <signal.h>

The func argument must be either a function address or one of the manifest constants listed below and defined in SIGNAL.H.

Constant	Description
`SIG_DFL`	Uses system-default response. If the calling program uses stream I/O, buffers created by the run-time library aren't flushed.
`SIG_IGN`	Ignores interrupt signal. This value should never be given for `SIGFPE`, since the floating-point state of the process is left undefined.
`SIG_GET`	Returns the current value of the signal.
`SIG_SGE`	Indicates an error occurred in the signal.
`SIG_ACK`	Indicates an acknowledgment was received.
`SIG_ERR`	A return type from a signal indicating an error has occurred.

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