add: implement signal

src/main.c

@@ -1,3 +1,4 @@
+#include <signal.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -12,6 +13,9 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <sys/time.h>
+#include <stdbool.h>
+
+bool loop = true;
 
 void print_err(const char *format, ...)
 {
@@ -134,6 +138,12 @@ int packet_check(char *packet, size_t packet_size)
     return tmp - checksum_bak;
 }
 
+void signal_handler(int code)
+{
+    (void) code;
+    loop = false;
+}
+
 int main(int ac, char **av)
 {
     (void) ac;
@@ -141,6 +151,8 @@ int main(int ac, char **av)
     size_t payload_size = 48;
     size_t packet_size = sizeof(struct icmphdr) + payload_size;
 
+    signal(SIGINT, signal_handler);
+
     int sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
 
     if (sockfd == -1)
@@ -174,7 +186,7 @@ int main(int ac, char **av)
     struct sockaddr_in sender;
     socklen_t len = sizeof(sender); 
 
-    while (1) {
+    while (loop) {
 
         struct timeval stop, start;