int login()
{
    char  uname[USESIZ],password[PWDSIZ];
    int  i=0;
    u.u_uid=1000;
    u.u_gid=2000;
    strcpy(u.u_name,"root");
    
    p.p_uid=1000;
    p.p_gid=2000;
    strcpy(p.password,"root");
    printf("You are going to login the system......\n");
    while(i<2)
    {
        printf("....................................\n ");
        sleep(1);
        i++;
    }
    printf("Please input your name:\n");
    scanf("%s",uname);
    if(strcmp(u.u_name,uname)!=0)
    {
        printf("Sorry,NO this user!\n");
        return 1;
    }
    printf("And your password:\n");
    scanf("%s",password);
    if(strcmp(p.password,password)!=0)
    {
        printf("Password Error!\n");
        return 2;
    }
    printf("Welcome....\n＾＿＾\n");
    return 0;
}