third question part 1

server_3.c

+#include <iostream>
+#include <csignal>
+#include <cstdlib>
+#include <unistd.h>
+#include <cstring>
+#include <unistd.h> 
+
+volatile bool running = true;
+
+void print_in_exit() {
+    std::cout << "Message during exit" << std::endl;
+}
+
+void handle_signal(int signal_number) {
+    std::cout << "Received signal: " << signal_number << std::endl;
+    std::cout << "Stopping the program" << std::endl;
+    running = false;
+}
+
+void print_process_info(const char* process_type) {
+    std::cout <<process_type << " | id: " << getpid() << std::endl;
+    std::cout <<process_type << " | father id: " << getppid() << std::endl;
+    std::cout <<process_type << " | groupd id: " << getpgrp() << std::endl;
+    std::cout << rand() % 100 << std::endl;
+}
+
+
+int main(){
+    std::cout << "started" << std::endl;
+    if (atexit(print_in_exit) != 0) {
+        perror("Fail in exit");
+        exit(EXIT_FAILURE);
+    }
+
+    struct sigaction sa;
+    sa.sa_handler = handle_signal;
+    sa.sa_flags = 0;
+    sigemptyset(&sa.sa_mask);
+
+    if (sigaction(SIGINT, &sa, nullptr) == -1) {
+        perror("Fail in exit");
+        exit(EXIT_FAILURE);
+    }
+
+    if (sigaction(SIGTERM, &sa, nullptr) == -1) {
+        perror("Fail in exit");
+        exit(EXIT_FAILURE);
+    }
+
+    pid_t pid = fork();
+    if (pid == 0) {
+        while (running) {
+            print_process_info("Child");
+            sleep(1);
+        }
+    } else {
+        while (running) {
+            print_process_info("Parent");
+            sleep(1);
+        }
+    }
+
+    std::cout << "finished" << std::endl;
+
+    return EXIT_SUCCESS;
+}
+
+/*
+Ouput:
+Parent | id: 26677
+Parent | father id: 16628
+Parent | groupd id: 26677
+23
+Child | id: 26678
+Child | father id: 26677
+Child | groupd id: 26677
+23
+Parent | id: 26677
+Parent | father id: 16628
+Parent | groupd id: 26677
+67
+Child | id: 26678
+Child | father id: 26677
+Child | groupd id: 26677
+67
+Parent | id: 26677
+Parent | father id: 16628
+Parent | groupd id: 26677
+35
+Child | id: 26678
+Child | father id: 26677
+Child | groupd id: 26677
+35
+Parent | id: 26677
+Parent | father id: 16628
+Parent | groupd id: 26677
+29
+Child | id: 26678
+Child | father id: 26677
+Child | groupd id: 26677
+29
+Parent | id: 26677
+Parent | father id: 16628
+Parent | groupd id: 26677
+2
+Child | id: 26678
+Child | father id: 26677
+Child | groupd id: 26677
+2
+^CReceived signal: 2
+Received signal: 2
+Stopping the program
+Stopping the program
+finished
+finished
+Message during exit
+Message during exit
+
+They have the same group id, and they both stop cin CTR+C because they belong to the same group,
+ and this singal is sent to all the process in the group
+
+
+
+*/
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