C++ TUTORIALS - C++ Signal Handling

C++ Signal Handling

Signal	Description
SIGABRT	Abnormal termination of the program, such as a call to abort
SIGFPE	An erroneous arithmetic operation, such as a divide by zero or an operation resulting in overflow.
SIGILL	Detection of an illegal instruction
SIGINT	Receipt of an interactive attention signal.
SIGSEGV	An invalid access to storage.
SIGTERM	A termination request sent to the program.

The signal() function:

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

ADVERTISEMENTS



						
#include <iostream>
#include <csignal>

using namespace std;

void signalHandler( int signum )
{
    cout << "Interrupt signal (" << signum << ") received.\n";

    // cleanup and close up stuff here  
    // terminate program  

   exit(signum);  

}

int main ()
{
    // register signal SIGINT and signal handler  
    signal(SIGINT, signalHandler);  

    while(1){
       cout << "Going to sleep...." << endl;
       sleep(1);
    }

    return 0;
}

						
Going to sleep....
Going to sleep....
Going to sleep....

						
Going to sleep....
Going to sleep....
Going to sleep....
Interrupt signal (2) received.

						The raise() function:

int raise (signal sig);

						
#include <iostream>
#include <csignal>

using namespace std;

void signalHandler( int signum )
{
    cout << "Interrupt signal (" << signum << ") received.\n";

    // cleanup and close up stuff here  
    // terminate program  

   exit(signum);  

}

int main ()
{
    int i = 0;
    // register signal SIGINT and signal handler  
    signal(SIGINT, signalHandler);  

    while(++i){
       cout << "Going to sleep...." << endl;
       if( i == 3 ){
          raise( SIGINT);
       }
       sleep(1);
    }

    return 0;
}

						
Going to sleep....
Going to sleep....
Going to sleep....
Interrupt signal (2) received.