#include <errno.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <OS.h>#include "user_thread.h"intmain(){pid_t child = fork();if (child < 0) {fprintf(stderr, "Error: fork() failed: %s\n", strerror(errno));exit(1);}if (child > 0) {// the parent process -- wait for the child to finishstatus_t result;wait_for_thread(child, &result);}struct user_thread *t = get_user_thread();printf("defer_signals: %" B_PRId32 "\n", t->defer_signals);return 0;}