C++ LANGUAGE THE RAISE() FUNCTION

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C++ LANGUAGE THE RAISE() FUNCTION

 
The raise() Function 


You can generate signals by function raise(), which takes an integer 
signal number as an argument and has the following syntax. 

int raise (signal sig); 

Here, sig is the signal number to send any of the signals: 
SIGINT, SIGABRT, SIGFPE, SIGILL, SIGSEGV, SIGTERM, SIGHUP. 
Following is the example where we raise a signal internally 
using raise() function as follows: 

#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; 
} 
When the above code is compiled and executed, it produces 
the following result and would come out automatically: 

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