C standard library signal.h

The signal.h header defines a variable type sig_atomic_t, two function calls, and several macros to handle different signals reported during a program's execution.

Library Macros

The SIG_ macros are used with the signal function to define signal functions.

SIG_DFL

Default signal handler.

SIG_ERR

Represents a signal error.

SIG_IGN

Signal ignore.

The SIG macros are used to represent a signal number in the following conditions −

SIGABRT

Abnormal program termination.

SIGFPE

Floating-point error like division by zero.

SIGILL

Illegal operation.

SIGINT

Interrupt signal such as ctrl-C.

SIGSEGV

Invalid access to storage like segment violation.

SIGTERM

Termination request.

Library Functions

void (*signal(int sig, void (*func)(int)))(int)

This function sets a function to handle signal i.e. a signal handler.

int raise(int sig)

This function causes signal sig to be generated. The sig argument is compatible with the SIG macros.