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The CTRL + C is one signal in C or C++. So we can catch by signal catching technique. For this signal, the code is SIGINT (Signal for Interrupt). Here the signal is caught by signal() function.
You can handle CTRL + C by catching the KeyboardInterrupt exception. You can implement any clean-up code in the exception handler.
In graphical user interface environments that use the control key to control the active program, control+C is often used to copy highlighted text to the clipboard. In many command-line interface environments, control+C is used to abort the current task and regain user control.
When Ctrl+C is pressed, SIGINT signal is generated, we can catch this signal and run our defined signal handler.
signal isn't the most reliable way as it differs in implementations. I would recommend using sigaction. Tom's code would now look like this :
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
void my_handler(int s){
printf("Caught signal %d\n",s);
exit(1);
}
int main(int argc,char** argv)
{
struct sigaction sigIntHandler;
sigIntHandler.sa_handler = my_handler;
sigemptyset(&sigIntHandler.sa_mask);
sigIntHandler.sa_flags = 0;
sigaction(SIGINT, &sigIntHandler, NULL);
pause();
return 0;
}
For a Windows console app, you want to use SetConsoleCtrlHandler to handle CTRL+C and CTRL+BREAK.
See here for an example.
You have to catch the SIGINT signal (we are talking POSIX right?)
See @Gab Royer´s answer for sigaction.
Example:
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
void my_handler(sig_t s){
printf("Caught signal %d\n",s);
exit(1);
}
int main(int argc,char** argv)
{
signal (SIGINT,my_handler);
while(1);
return 0;
}
Yeah, this is a platform dependent question.
If you are writing a console program on POSIX,
use the signal API (#include <signal.h>).
In a WIN32 GUI application you should handle the WM_KEYDOWN message.
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