功能说明：设置公用程序。
语法：setup
补充说明：setup是一个设置公用程序，提供图形界面的操作方式。在setup中可设置7类的选项：
１.登陆认证方式
２.键盘组态设置
３.鼠标组态设置
４.开机时所要启动的系统服务
５.声卡组态设置
６.时区设置
７.XWindows组态设置
#p#
NAME
setup - setup devices and file systems, mount root file system
SYNOPSIS
#include <unistd.h>
_syscall0(int, setup);
int setup(void);
DESCRIPTION
setup is called once from within linux/init/main.c. It calls initialization functions for devices and file systems configured into the kernel and then mounts the root file system.
No user process may call setup. Any user process, even a process with super-user permission, will receive EPERM.
RETURN VALUE
setup always returns -1 for a user process.
