signal() Function 🎯Welcome to another exciting lesson on C Programming! Today, we're diving deep into the signal() function - a powerful tool for handling signals in your C programs. Let's get started!
In C programming, a signal is an asynchronous event generated by the operating system or the system libraries. Signals can be caused by various events such as receiving a termination signal, a segmentation fault, or a user-defined event.
signal() Function 💡The signal() function allows you to define what action should be taken when a specific signal occurs in your program. This function provides a way to handle signals gracefully and avoid abrupt termination.
signal() Function 📝#include <signal.h>
void (*signal(int signum, void (*handler)(int)))(int);signum: The signal number (e.g., SIGINT, SIGTERM, etc.)handler: The function to be called when the signal occurs. If handler is set to SIG_DFL, the default action is taken. If handler is set to SIG_IGN, the signal is ignored.Let's create a simple program that prints a message and catches the SIGINT signal (Ctrl+C) to print a friendly goodbye instead of terminating.
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
void my_handler(int sig) {
printf("Goodbye!\n");
exit(0);
}
int main() {
signal(SIGINT, my_handler); // Set the SIGINT signal handler
printf("Hello, press Ctrl+C to exit.\n");
while (1) {
sleep(1); // Simulate some work
}
return 0;
}When you run this program and press Ctrl+C, the message "Goodbye!" will be printed instead of the program terminating.
Which header file do you need to include to use the `signal()` function?
Stay tuned for more on the signal() function, and happy coding! 💡📝🎯