+asmlinkage long sys_dup2(unsigned int oldfd, unsigned int newfd)
+{
+ if (unlikely(newfd == oldfd)) { /* corner case */
+ struct files_struct *files = current->files;
+ rcu_read_lock();
+ if (!fcheck_files(files, oldfd))
+ oldfd = -EBADF;
+ rcu_read_unlock();
+ return oldfd;
+ }
+ return sys_dup3(oldfd, newfd, 0);
+}
+