Added process_basics.c exercice, renamed exercices

rendu/process_basics.c

@@ -0,0 +1,58 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   process_basics.c                                   :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: ruiferna <ruiferna@student.42porto.com>    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/10/14 17:06:42 by ruiferna          #+#    #+#             */
+/*   Updated: 2025/10/14 19:53:46 by ruiferna         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+#define NUM_CHILDREN 3
+
+int main(int argc, char *argv[]) {
+    pid_t pids[NUM_CHILDREN];
+    int i;
+
+	i = 0;
+    while (i < NUM_CHILDREN) 
+	{
+        pids[i] = fork();
+        if (pids[i] == -1) {
+            printf("Error creating process\n");
+            return 1;
+        }
+        if (pids[i] == 0) {
+            // Child process
+            int child_id = i + 1;
+            int j;
+			j = 0;
+            while (j <= 5)
+			{
+                printf("Child %d (PID: %d): Message %d\n", child_id, getpid(), j);
+                usleep(100000);
+				j++;
+            }
+            exit(0);
+        }
+		i++;
+    }
+
+    // Parent process
+	i = 0;
+    while (i < NUM_CHILDREN)
+	{
+        waitpid(pids[i], NULL, 0);
+		i++;
+    }
+    printf("Parent: All 3 children have finished\n");
+    return (0);
+}
+