Checking if ctrl-c was pressed.
The
signal handler that is associated with
SIGINT is called when the user presses
ctrl-c.
The following code snipplet establishes a signal handler that traps the pressing of
ctrl-c and writes a corresponding message to
stdout.
#include <signal.h>
#include <stdio.h>
#include <time.h>
void ctrl_c_pressed(int signum) {
//
// The user pressed ctrl-c. The for-loop
// below stoped, the following message is printed
// and the loop is resumed again.
//
printf("ctrl-c was pressed.\n");
}
int main() {
struct timespec duration;
duration.tv_sec = 0;
duration.tv_nsec = 1e6 * 100; // 100 milli Seconds
//
// Call ctrl_c_pressed when the user presses
// ctrl-c:
//
signal(SIGINT, ctrl_c_pressed);
//
// Print the number 0 through 19 in intervals
// of 100 milliseconds:
//
for (int i = 0; i<20; i++) {
printf("i = %d\n", i);
nanosleep(&duration, NULL);
}
}