first examples for myself

fork1.cpp

@@ -0,0 +1,37 @@
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/wait.h>
+
+void forkAndPrint(int n){
+  // pid_t pid = fork();
+  
+  // if(n>0){
+  //   print("Child process, PID = %d\n", getpid());
+  // }
+  // else{
+  //   wait(NULL);
+  //   print("Exiting parent process
+  // }
+
+  pid_t pid;
+  if (n > 0){
+    pid = fork();
+    if(pid != 0){
+      printf("Parent process, PID = %d waiting to finish\n",getpid());
+      wait(NULL);
+      printf("Parent process, PID = %d finishing\n",getpid());
+    }
+    else {
+      forkAndPrint(n-1);
+    }
+  }
+  else{
+    printf("Bottom process!\n");
+  }
+}
+
+int main() {
+  forkAndPrint(10);
+
+  return 0;
+}

signal1.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <signal.h>
+#include <unistd.h>
+
+void handle_sigint(int sig) {
+    printf("Caught signal %d\n", sig);
+}
+
+int main() {
+    signal(SIGINT, handle_sigint); // Register signal handler
+    while (1) {
+        sleep(1); // Sleep for 1 second
+        printf("Process ID %d running...\n", getpid());
+    }
+    return 0;
+}