The signal function enables a process to choose one of several ways to handle an interrupt signal from the operating system. The sig argument is the interrupt to which signal responds; it must be one of the following manifest constants, which are defined in SIGNAL.H.

If sig is not one of the above values, the invalid parameter handler is invoked, as defined in Parameter Validation . If execution is allowed to continue, this function sets errno to EINVALand returns SIG_ERR.

By default, signal terminates the calling program with exit code 3, regardless of the value of sig.

Example :

int main(void)
{    

    typedef void (*SignalHandlerPointer)(int);

    SignalHandlerPointer previousHandler;
    previousHandler = signal(SIGABRT, SignalHandler);
    previousHandler = signal(SIGINT, SignalHandler);
    previousHandler = signal(SIGTERM, SignalHandler);
    previousHandler = signal(SIGBREAK, SignalHandler);

    //abort();
    while (1)
    {
        Sleep(100);
    }

void SignalHandler(int signal)
{
    if (signal == SIGABRT)
    {
        // abort signal handler code
    } else 
    {
        // ...
    }

    printf("____ signal: %d  \n", signal);
}

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