syscall_exit.c

#include "system_calls.h"
#include "threads/interrupt.h" // Dependency for intr_frame struct
#include "threads/thread.h" // Dependency for thread struct

void syscall_exit(struct intr_frame *f) {
	struct thread *current_thread;	// creates thread struct from thread.h
	current_thread = thread_current(); // Sets current thread

	// pop off first int argument from interrupt frame
	int exit_code = *((int*)f->esp + 1);
	current_thread->exit_code = exit_code; // Returns exit code to kernel

	thread_exit(); // Exiting current thread
	f->eax = -1; // Returning -1 for success
}