Using signal handling - C++ Function

C++ examples for Function:Useful Function

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Introduction

Signal Explanation
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.

Demo Code

#include <iostream> 
#include <iomanip> 
#include <csignal> 
#include <cstdlib> 
#include <ctime> 
using namespace std; 

void signalHandler( int ); 

int main() /*ww  w.j av  a 2 s  .  c o m*/
{ 
   signal( SIGINT , signalHandler ); 
   srand( time( 0 ) ); 

   // create and output random numbers 
   for ( int i = 1; i <= 100; i++ ) 
   { 
       int x = 1 + rand() % 50; 

       if ( x == 25 ) 
          raise( SIGINT ); // raise SIGINT when x is 25 

       cout << setw( 4 ) << i; 

       if ( i % 10 == 0 ) 
          cout << endl; // output endl when i is a multiple of 10 
   }
}

// handles signal 
void signalHandler( int signalValue ) 
{ 
   cout << "\nInterrupt signal (" << signalValue 
         << ") received.\n" 
         << "Do you wish to continue (1 = yes or 2 = no)? "; 

   int response; 

   cin >> response; 

   // check for invalid responses 
   while ( response != 1 && response != 2 ) 
   { 
       cout << "(1 = yes or 2 = no)? "; 
       cin >> response; 
   } 

   // determine if it is time to exit 
   if ( response != 1 ) 
       exit( EXIT_SUCCESS ); 

    // call signal and pass it SIGINT and address of signalHandler 
    signal( SIGINT , signalHandler ); 
}

Result


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