Signal in C++

How Signal works in C++?

• There are two arguments which are passed in the signal function and these two arguments play a very important role in a way that the registered signal argument will get registered with the signal function and the second argument of signal function which is signal handler will try to catch all the exceptions and interrupted signals using signal handler.
• Once compiled they will produce some output and then it is needed to create that interruption and that visible difference will be present which means the catch signal will able to print those caught interruption.
• Followed with this will also include one more function namely raise () function which considers the first argument which is the integer signal number and can send any of the defined signals. It is possible to raise a function to generate necessary signal.

List of Signal in C++

Given below are the list:

Examples of Signal in C++

Given below are the examples:

Example #1

This program illustrates the interruption getting created using signal handler and with SIGABRT method once it reaches in infinite loop gets aborted after exiting.

Code:

#include <iostream>
#include <csignal>
using namespace std;
void signal_handler( int signl_no ) {
cout << "The interrupt signal is (" << signl_no << "). \n";
exit(signl_no);
}
int main () {
signal(SIGABRT, signal_handler);
while(true)
cout << "Hello educba learn infinite..." << endl;
return 0;
}

Output:

Example #2

This program illustrates the SIGINT signal functionality within the signal function.

Code:

#include <iostream>
#include <csignal>
using namespace std;
void signal_handler( int signl_num ) {
cout << "Interrupt signal is (" << signl_num << ").\n";
exit(signl_num);
}
int main () {
int count = 0;
signal(SIGINT, signal_handler);
while(++count) {
cout << "Hello educba battle ground..." << endl;
if( count == 5 )
raise(SIGINT);
}
return 0;
}

Output:

Example #3

This program illustrates the SIGTERM signal within the signal function().

Code:

#include <iostream>
#include <csignal>
using namespace std;
void signal_handler( int signl_num ) {
cout << "Interrupt signal is (" << signl_num << ").\n";
exit(signl_num);
}
int main () {
int count = 0;
signal(SIGTERM, signal_handler);
while(++count) {
cout << "Hello educba battle ground..." << endl;
if( count == 5 )
raise(SIGTERM);
}
return 0;
}

Output:

Example #4

This program illustrates the SIGBUS signal within the signal function().

#include <iostream>
#include <csignal>
using namespace std;
void signal_handler( int signl_num ) {
cout << "Interrupt signal is (" << signl_num << ").\n";
exit(signl_num);
}
int main () {
int count = 0;
signal(SIGBUS, signal_handler);
while(++count) {
cout << "Hello educba battle ground..." << endl;
if( count == 5 )
raise(SIGBUS);
}
return 0;
}

Output:

Example #5

This program illustrates the SIGILL signal within the signal function().

Code:

#include <iostream>
#include <csignal>
using namespace std;
void signal_handler( int signl_num ) {
cout << "Interrupt signal is (" << signl_num << ").\n";
exit(signl_num);
}
int main () {
int count = 0;
signal(SIGILL, signal_handler);
while(++count) {
cout << "Hello educba battle ground..." << endl;
if( count == 5 )
raise(SIGILL);
}
return 0;
}

Output:

Example #6

This program illustrates the SIGALRM signal within the signal function().

Code:

#include <iostream>
#include <csignal>
using namespace std;
void signal_handler( int signl_num ) {
cout << "Interrupt signal is (" << signl_num << ").\n";
exit(signl_num);
}
int main () {
int count = 0;
signal(SIGALRM, signal_handler);
while(++count) {
cout << "Hello educba battle ground..." << endl;
if( count == 5 )
raise(SIGALRM);
}
return 0;
}

Output:

Example #7

This program illustrates the SIGSEGV signal within the signal function().

Code:

#include <iostream>
#include <csignal>
using namespace std;
void signal_handler( int signl_num ) {
cout << "Interrupt signal is (" << signl_num << ").\n";
exit(signl_num);
}
int main () {
int count = 0;
signal(SIGSEGV, signal_handler);
while(++count) {
cout << "Hello educba battle ground..." << endl;
if( count == 5 )
raise(SIGSEGV);
}
return 0;
}

Output: