C++ put_user函数代码示例

/* ioctl callback function */
long ioctl(struct file *file,
           unsigned int ioctl_num,
           unsigned long ioctl_param)
{
    char ch;    /* current character to or from userspace */
    int size;   /* size of page being written to */
    int bytes;  /* current number of bytes being read or written */

    switch (ioctl_num) {

        case IOCTL_ALLOC:

            printk(KERN_INFO "vmm: allocating %d bytes\n", (int)ioctl_param);
            return buddy_alloc((int)ioctl_param);

        case IOCTL_FREE:

            printk(KERN_INFO "vmm: freeing idx %d\n", (int)ioctl_param);
            return buddy_free((int)ioctl_param);

        case IOCTL_SET_IDX:

            current_idx = (int)ioctl_param;
            printk(KERN_INFO "vmm: setting idx to %d\n", current_idx);
            return 0;

        case IOCTL_SET_READ_SIZE:

            read_size = (int)ioctl_param;
            printk(KERN_INFO "vmm: setting read size to %d\n", read_size);
            return 0;

        case IOCTL_WRITE:

            /* reset the number of bytes written */
            bytes = 0;

            /* get the page size */
            size = buddy_size(current_idx);

            /* keep writing until some condition breaks us out */
            while (1) {

                /* get the next byte from userspace */
                get_user(ch, (char*)ioctl_param+bytes);

                /* if it's a null terminator we are finished writing */
                if (ch == '\0') break;

                /* if we are about to write outside the page error out */
                if (bytes > size) {
                    printk(KERN_INFO "vmm: writing out of allocated area\n");
                    return -1;
                }

                /* write the byte into the pool */
                *(buddy_pool+current_idx+bytes) = ch;
                printk(KERN_INFO "wrote %c to %d\n", ch, current_idx+bytes);

                /* go to the next byte */
                bytes++;
            }

            printk(KERN_INFO "vmm: wrote %d bytes\n", bytes);

            /* return how many bytes were written */
            return bytes;

        case IOCTL_READ:

            /* return error if trying to read more than the page size */
            if (read_size > buddy_size(current_idx)) {
                printk(KERN_INFO "vmm: read bigger than allocated area\n");
                return -1;
            }

            /* reset the number of bytes read */
            bytes = 0;

            /* keep reading bytes until we've satisfied the request */
            while (bytes < read_size) {

                /* get byte out of pool and send it to user */
                put_user(*(buddy_pool+current_idx+bytes), (char*)ioctl_param+bytes);

                /* go to the next byte */
                bytes++;
            }

            printk(KERN_INFO "vmm: read %d bytes\n", bytes);

            /* return how many bytes were read */
            return bytes;

        default: printk(KERN_INFO "vmm: unknown ioctl call\n");
    }

    return 0;
}

/* Get the packet mode of a pty */
static int pty_get_pktmode(struct tty_struct *tty, int __user *arg)
{
	int pktmode = tty->packet;
	return put_user(pktmode, arg);
}

static long ar7_wdt_ioctl(struct file *file,
					unsigned int cmd, unsigned long arg)
{
	static const struct watchdog_info ident = {
		.identity = LONGNAME,
		.firmware_version = 1,
		.options = (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
						WDIOF_MAGICCLOSE),
	};
	int new_margin;

	switch (cmd) {
	case WDIOC_GETSUPPORT:
		if (copy_to_user((struct watchdog_info *)arg, &ident,
				sizeof(ident)))
			return -EFAULT;
		return 0;
	case WDIOC_GETSTATUS:
	case WDIOC_GETBOOTSTATUS:
		if (put_user(0, (int *)arg))
			return -EFAULT;
		return 0;
	case WDIOC_KEEPALIVE:
		ar7_wdt_kick(1);
		return 0;
	case WDIOC_SETTIMEOUT:
		if (get_user(new_margin, (int *)arg))
			return -EFAULT;
		if (new_margin < 1)
			return -EINVAL;

		spin_lock(&wdt_lock);
		ar7_wdt_update_margin(new_margin);
		ar7_wdt_kick(1);
		spin_unlock(&wdt_lock);

	case WDIOC_GETTIMEOUT:
		if (put_user(margin, (int *)arg))
			return -EFAULT;
		return 0;
	default:
		return -ENOTTY;
	}
}

static const struct file_operations ar7_wdt_fops = {
	.owner		= THIS_MODULE,
	.write		= ar7_wdt_write,
	.unlocked_ioctl	= ar7_wdt_ioctl,
	.open		= ar7_wdt_open,
	.release	= ar7_wdt_release,
	.llseek		= no_llseek,
};

static struct miscdevice ar7_wdt_miscdev = {
	.minor		= WATCHDOG_MINOR,
	.name		= "watchdog",
	.fops		= &ar7_wdt_fops,
};

static int __devinit ar7_wdt_probe(struct platform_device *pdev)
{
	int rc;

	spin_lock_init(&wdt_lock);

	ar7_regs_wdt =
		platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
	if (!ar7_regs_wdt) {
		printk(KERN_ERR DRVNAME ": could not get registers resource\n");
		rc = -ENODEV;
		goto out;
	}

	if (!request_mem_region(ar7_regs_wdt->start,
				resource_size(ar7_regs_wdt), LONGNAME)) {
		printk(KERN_WARNING DRVNAME ": watchdog I/O region busy\n");
		rc = -EBUSY;
		goto out;
	}

	ar7_wdt = ioremap(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
	if (!ar7_wdt) {
		printk(KERN_ERR DRVNAME ": could not ioremap registers\n");
		rc = -ENXIO;
		goto out_mem_region;
	}

	vbus_clk = clk_get(NULL, "vbus");
	if (IS_ERR(vbus_clk)) {
		printk(KERN_ERR DRVNAME ": could not get vbus clock\n");
		rc = PTR_ERR(vbus_clk);
		goto out_mem_region;
	}

	ar7_wdt_disable_wdt();
	ar7_wdt_prescale(prescale_value);
	ar7_wdt_update_margin(margin);

	rc = misc_register(&ar7_wdt_miscdev);
//.........这里部分代码省略.........

//.........这里部分代码省略.........
		if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY)
		    || RTC_ALWAYS_BCD) {
			if (yrs > 169) {
				restore_flags(flags);
				return -EINVAL;
			}
			if (yrs >= 100)
				yrs -= 100;

			BIN_TO_BCD(sec);
			BIN_TO_BCD(min);
			BIN_TO_BCD(hrs);
			BIN_TO_BCD(day);
			BIN_TO_BCD(mon);
			BIN_TO_BCD(yrs);
		}

		save_control = CMOS_READ(RTC_CONTROL);
		CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
		save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
		CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);

		CMOS_WRITE(yrs, RTC_YEAR);
		CMOS_WRITE(mon, RTC_MONTH);
		CMOS_WRITE(day, RTC_DAY_OF_MONTH);
		CMOS_WRITE(hrs, RTC_HOURS);
		CMOS_WRITE(min, RTC_MINUTES);
		CMOS_WRITE(sec, RTC_SECONDS);

		CMOS_WRITE(save_control, RTC_CONTROL);
		CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);

		restore_flags(flags);
		return 0;
	}
	case RTC_IRQP_READ:	/* Read the periodic IRQ rate.	*/
	{
		return put_user(rtc_freq, (unsigned long *)arg);
	}
	case RTC_IRQP_SET:	/* Set periodic IRQ rate.	*/
	{
		int tmp = 0;
		unsigned char val;

		/* 
		 * The max we can do is 8192Hz.
		 */
		if ((arg < 2) || (arg > 8192))
			return -EINVAL;
		/*
		 * We don't really want Joe User generating more
		 * than 64Hz of interrupts on a multi-user machine.
		 */
		if ((arg > 64) && (!capable(CAP_SYS_RESOURCE)))
			return -EACCES;

		while (arg > (1<<tmp))
			tmp++;

		/*
		 * Check that the input was really a power of 2.
		 */
		if (arg != (1<<tmp))
			return -EINVAL;

		rtc_freq = arg;

		save_flags(flags);
		cli();
		val = CMOS_READ(RTC_FREQ_SELECT) & 0xf0;
		val |= (16 - tmp);
		CMOS_WRITE(val, RTC_FREQ_SELECT);
		restore_flags(flags);
		return 0;
	}
#ifdef __alpha__
	case RTC_EPOCH_READ:	/* Read the epoch.	*/
	{
		return put_user (epoch, (unsigned long *)arg);
	}
	case RTC_EPOCH_SET:	/* Set the epoch.	*/
	{
		/* 
		 * There were no RTC clocks before 1900.
		 */
		if (arg < 1900)
			return -EINVAL;

		if (!capable(CAP_SYS_TIME))
			return -EACCES;

		epoch = arg;
		return 0;
	}
#endif
	default:
		return -EINVAL;
	}
	return copy_to_user((void *)arg, &wtime, sizeof wtime) ? -EFAULT : 0;
}

static long sc1200wdt_ioctl(struct file *file, unsigned int cmd,
						unsigned long arg)
{
	int new_timeout;
	void __user *argp = (void __user *)arg;
	int __user *p = argp;
	static const struct watchdog_info ident = {
		.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
							WDIOF_MAGICCLOSE,
		.firmware_version = 0,
		.identity = "PC87307/PC97307",
	};

	switch (cmd) {
	case WDIOC_GETSUPPORT:
		if (copy_to_user(argp, &ident, sizeof(ident)))
			return -EFAULT;
		return 0;

	case WDIOC_GETSTATUS:
		return put_user(sc1200wdt_status(), p);

	case WDIOC_GETBOOTSTATUS:
		return put_user(0, p);

	case WDIOC_SETOPTIONS:
	{
		int options, retval = -EINVAL;

		if (get_user(options, p))
			return -EFAULT;

		if (options & WDIOS_DISABLECARD) {
			sc1200wdt_stop();
			retval = 0;
		}

		if (options & WDIOS_ENABLECARD) {
			sc1200wdt_start();
			retval = 0;
		}

		return retval;
	}
	case WDIOC_KEEPALIVE:
		sc1200wdt_write_data(WDTO, timeout);
		return 0;

	case WDIOC_SETTIMEOUT:
		if (get_user(new_timeout, p))
			return -EFAULT;
		/* the API states this is given in secs */
		new_timeout /= 60;
		if (new_timeout < 0 || new_timeout > MAX_TIMEOUT)
			return -EINVAL;
		timeout = new_timeout;
		sc1200wdt_write_data(WDTO, timeout);
		/* fall through and return the new timeout */

	case WDIOC_GETTIMEOUT:
		return put_user(timeout * 60, p);

	default:
		return -ENOTTY;
	}
}


static int sc1200wdt_release(struct inode *inode, struct file *file)
{
	if (expect_close == 42) {
		sc1200wdt_stop();
#ifdef CONFIG_DEBUG_PRINTK
		printk(KERN_INFO PFX "Watchdog disabled\n");
#else
		;
#endif
	} else {
		sc1200wdt_write_data(WDTO, timeout);
#ifdef CONFIG_DEBUG_PRINTK
		printk(KERN_CRIT PFX
			"Unexpected close!, timeout = %d min(s)\n", timeout);
#else
		;
#endif
	}
	clear_bit(0, &open_flag);
	expect_close = 0;

	return 0;
}


static ssize_t sc1200wdt_write(struct file *file, const char __user *data,
						size_t len, loff_t *ppos)
{
	if (len) {
		if (!nowayout) {
			size_t i;

//.........这里部分代码省略.........

static long sch311x_wdt_ioctl(struct file *file, unsigned int cmd,
							unsigned long arg)
{
	int status;
	int new_timeout;
	void __user *argp = (void __user *)arg;
	int __user *p = argp;
	static const struct watchdog_info ident = {
		.options		= WDIOF_KEEPALIVEPING |
					  WDIOF_SETTIMEOUT |
					  WDIOF_MAGICCLOSE,
		.firmware_version	= 1,
		.identity		= DRV_NAME,
	};

	switch (cmd) {
	case WDIOC_GETSUPPORT:
		if (copy_to_user(argp, &ident, sizeof(ident)))
			return -EFAULT;
		break;

	case WDIOC_GETSTATUS:
	{
		sch311x_wdt_get_status(&status);
		return put_user(status, p);
	}
	case WDIOC_GETBOOTSTATUS:
		return put_user(sch311x_wdt_data.boot_status, p);

	case WDIOC_SETOPTIONS:
	{
		int options, retval = -EINVAL;

		if (get_user(options, p))
			return -EFAULT;
		if (options & WDIOS_DISABLECARD) {
			sch311x_wdt_stop();
			retval = 0;
		}
		if (options & WDIOS_ENABLECARD) {
			sch311x_wdt_start();
			retval = 0;
		}
		return retval;
	}
	case WDIOC_KEEPALIVE:
		sch311x_wdt_keepalive();
		break;

	case WDIOC_SETTIMEOUT:
		if (get_user(new_timeout, p))
			return -EFAULT;
		if (sch311x_wdt_set_heartbeat(new_timeout))
			return -EINVAL;
		sch311x_wdt_keepalive();
		/* Fall */
	case WDIOC_GETTIMEOUT:
		return put_user(timeout, p);
	default:
		return -ENOTTY;
	}
	return 0;
}

static int sch311x_wdt_open(struct inode *inode, struct file *file)
{
	if (test_and_set_bit(0, &sch311x_wdt_is_open))
		return -EBUSY;
	/*
	 *	Activate
	 */
	sch311x_wdt_start();
	return nonseekable_open(inode, file);
}

static int sch311x_wdt_close(struct inode *inode, struct file *file)
{
	if (sch311x_wdt_expect_close == 42) {
		sch311x_wdt_stop();
	} else {
		printk(KERN_CRIT PFX
				"Unexpected close, not stopping watchdog!\n");
		sch311x_wdt_keepalive();
	}
	clear_bit(0, &sch311x_wdt_is_open);
	sch311x_wdt_expect_close = 0;
	return 0;
}

/*
 *	Kernel Interfaces
 */

static const struct file_operations sch311x_wdt_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.write		= sch311x_wdt_write,
	.unlocked_ioctl	= sch311x_wdt_ioctl,
	.open		= sch311x_wdt_open,
	.release	= sch311x_wdt_close,
//.........这里部分代码省略.........

asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
			  unsigned long arg4, unsigned long arg5)
{
	int error;
	int sig;

	error = security_task_prctl(option, arg2, arg3, arg4, arg5);
	if (error)
		return error;

	switch (option) {
		case PR_SET_PDEATHSIG:
			sig = arg2;
			if (sig < 0 || sig > _NSIG) {
				error = -EINVAL;
				break;
			}
			current->pdeath_signal = sig;
			break;
		case PR_GET_PDEATHSIG:
			error = put_user(current->pdeath_signal, (int __user *)arg2);
			break;
		case PR_GET_DUMPABLE:
			if (current->mm->dumpable)
				error = 1;
			break;
		case PR_SET_DUMPABLE:
			if (arg2 != 0 && arg2 != 1) {
				error = -EINVAL;
				break;
			}
			current->mm->dumpable = arg2;
			break;

		case PR_SET_UNALIGN:
			error = SET_UNALIGN_CTL(current, arg2);
			break;
		case PR_GET_UNALIGN:
			error = GET_UNALIGN_CTL(current, arg2);
			break;
		case PR_SET_FPEMU:
			error = SET_FPEMU_CTL(current, arg2);
			break;
		case PR_GET_FPEMU:
			error = GET_FPEMU_CTL(current, arg2);
			break;
		case PR_SET_FPEXC:
			error = SET_FPEXC_CTL(current, arg2);
			break;
		case PR_GET_FPEXC:
			error = GET_FPEXC_CTL(current, arg2);
			break;
		case PR_GET_TIMING:
			error = PR_TIMING_STATISTICAL;
			break;
		case PR_SET_TIMING:
			if (arg2 == PR_TIMING_STATISTICAL)
				error = 0;
			else
				error = -EINVAL;
			break;

		case PR_GET_KEEPCAPS:
			if (current->keep_capabilities)
				error = 1;
			break;
		case PR_SET_KEEPCAPS:
			if (arg2 != 0 && arg2 != 1) {
				error = -EINVAL;
				break;
			}
			current->keep_capabilities = arg2;
			break;
		default:
			error = -EINVAL;
			break;
	}
	return error;
}

/*
 * handle the arch-specific side of process tracing
 */
long arch_ptrace(struct task_struct *child, long request,
		 unsigned long addr, unsigned long data)
{
	unsigned long tmp;
	int ret;
	unsigned long __user *datap = (unsigned long __user *) data;

	switch (request) {
	/* read the word at location addr in the USER area. */
	case PTRACE_PEEKUSR:
		ret = -EIO;
		if ((addr & 3) || addr > sizeof(struct user) - 3)
			break;

		tmp = 0;  /* Default return condition */
		if (addr < NR_PTREGS << 2)
			tmp = get_stack_long(child,
					     ptrace_regid_to_frame[addr]);
		ret = put_user(tmp, datap);
		break;

		/* write the word at location addr in the USER area */
	case PTRACE_POKEUSR:
		ret = -EIO;
		if ((addr & 3) || addr > sizeof(struct user) - 3)
			break;

		ret = 0;
		if (addr < NR_PTREGS << 2)
			ret = put_stack_long(child, ptrace_regid_to_frame[addr],
					     data);
		break;

	case PTRACE_GETREGS:	/* Get all integer regs from the child. */
		return copy_regset_to_user(child, &user_mn10300_native_view,
					   REGSET_GENERAL,
					   0, NR_PTREGS * sizeof(long),
					   datap);

	case PTRACE_SETREGS:	/* Set all integer regs in the child. */
		return copy_regset_from_user(child, &user_mn10300_native_view,
					     REGSET_GENERAL,
					     0, NR_PTREGS * sizeof(long),
					     datap);

	case PTRACE_GETFPREGS:	/* Get the child FPU state. */
		return copy_regset_to_user(child, &user_mn10300_native_view,
					   REGSET_FPU,
					   0, sizeof(struct fpu_state_struct),
					   datap);

	case PTRACE_SETFPREGS:	/* Set the child FPU state. */
		return copy_regset_from_user(child, &user_mn10300_native_view,
					     REGSET_FPU,
					     0, sizeof(struct fpu_state_struct),
					     datap);

	default:
		ret = ptrace_request(child, request, addr, data);
		break;
	}

	return ret;
}

static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
{
	struct sock *sk = sock->sk;
	struct l2cap_options opts;
	struct l2cap_conninfo cinfo;
	int len, err = 0;
	u32 opt;

	BT_DBG("sk %p", sk);

	if (get_user(len, optlen))
		return -EFAULT;

	lock_sock(sk);

	switch (optname) {
	case L2CAP_OPTIONS:
		memset(&opts, 0, sizeof(opts));
		opts.imtu     = l2cap_pi(sk)->imtu;
		opts.omtu     = l2cap_pi(sk)->omtu;
		opts.flush_to = l2cap_pi(sk)->flush_to;
		opts.mode     = l2cap_pi(sk)->mode;
		opts.fcs      = l2cap_pi(sk)->fcs;
		opts.max_tx   = l2cap_pi(sk)->max_tx;
		opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win;

		len = min_t(unsigned int, len, sizeof(opts));
		if (copy_to_user(optval, (char *) &opts, len))
			err = -EFAULT;

		break;

	case L2CAP_LM:
		switch (l2cap_pi(sk)->sec_level) {
		case BT_SECURITY_LOW:
			opt = L2CAP_LM_AUTH;
			break;
		case BT_SECURITY_MEDIUM:
			opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
			break;
		case BT_SECURITY_HIGH:
			opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
							L2CAP_LM_SECURE;
			break;
		default:
			opt = 0;
			break;
		}

		if (l2cap_pi(sk)->role_switch)
			opt |= L2CAP_LM_MASTER;

		if (l2cap_pi(sk)->force_reliable)
			opt |= L2CAP_LM_RELIABLE;

		if (put_user(opt, (u32 __user *) optval))
			err = -EFAULT;
		break;

	case L2CAP_CONNINFO:
		if (sk->sk_state != BT_CONNECTED &&
					!(sk->sk_state == BT_CONNECT2 &&
						bt_sk(sk)->defer_setup)) {
			err = -ENOTCONN;
			break;
		}

		cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle;
		memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3);

		len = min_t(unsigned int, len, sizeof(cinfo));
		if (copy_to_user(optval, (char *) &cinfo, len))
			err = -EFAULT;

		break;

	default:
		err = -ENOPROTOOPT;
		break;
	}

	release_sock(sk);
	return err;
}

static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
{
	struct sock *sk = sock->sk;
	struct bt_security sec;
	struct bt_power pwr;
	int len, err = 0;

	BT_DBG("sk %p", sk);

	if (level == SOL_L2CAP)
		return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);

	if (level != SOL_BLUETOOTH)
		return -ENOPROTOOPT;

	if (get_user(len, optlen))
		return -EFAULT;

	lock_sock(sk);

	switch (optname) {
	case BT_SECURITY:
		if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
				&& sk->sk_type != SOCK_RAW) {
			err = -EINVAL;
			break;
		}

		sec.level = l2cap_pi(sk)->sec_level;

		len = min_t(unsigned int, len, sizeof(sec));
		if (copy_to_user(optval, (char *) &sec, len))
			err = -EFAULT;

		break;

	case BT_DEFER_SETUP:
		if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
			err = -EINVAL;
			break;
		}

		if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval))
			err = -EFAULT;

		break;

	case BT_FLUSHABLE:
		if (put_user(l2cap_pi(sk)->flushable, (u32 __user *) optval))
			err = -EFAULT;

		break;

	case BT_POWER:
		if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
				&& sk->sk_type != SOCK_RAW) {
			err = -EINVAL;
			break;
		}

		pwr.force_active = l2cap_pi(sk)->force_active;

		len = min_t(unsigned int, len, sizeof(pwr));
		if (copy_to_user(optval, (char *) &pwr, len))
			err = -EFAULT;

		break;

	default:
		err = -ENOPROTOOPT;
		break;
	}

	release_sock(sk);
	return err;
}

//.........这里部分代码省略.........
	unsigned char	enabled, pending;

	switch (cmd) {
		case RTC_UIE_ON:
		case RTC_UIE_OFF:
		case RTC_PIE_ON:
		case RTC_PIE_OFF:
		case RTC_AIE_ON:
		case RTC_AIE_OFF:
		case RTC_ALM_SET:
		case RTC_ALM_READ:
		case RTC_IRQP_READ:
		case RTC_IRQP_SET:
		case RTC_EPOCH_READ:
		case RTC_EPOCH_SET:
			return -EINVAL;

		case RTC_RD_TIME:
			spin_lock_irqsave(&efi_rtc_lock, flags);

			status = efi.get_time(&eft, &cap);

			spin_unlock_irqrestore(&efi_rtc_lock,flags);

			if (status != EFI_SUCCESS) {
				/* should never happen */
				printk(KERN_ERR "efitime: can't read time\n");
				return -EINVAL;
			}

			convert_from_efi_time(&eft, &wtime);

			return copy_to_user((void __user *)arg, &wtime,
					    sizeof (struct rtc_time)) ? - EFAULT : 0;

		case RTC_SET_TIME:

			if (!capable(CAP_SYS_TIME)) return -EACCES;

			if (copy_from_user(&wtime, (struct rtc_time __user *)arg,
					   sizeof(struct rtc_time)) )
				return -EFAULT;

			convert_to_efi_time(&wtime, &eft);

			spin_lock_irqsave(&efi_rtc_lock, flags);

			status = efi.set_time(&eft);

			spin_unlock_irqrestore(&efi_rtc_lock,flags);

			return status == EFI_SUCCESS ? 0 : -EINVAL;

		case RTC_WKALM_SET:

			if (!capable(CAP_SYS_TIME)) return -EACCES;

			ewp = (struct rtc_wkalrm __user *)arg;

			if (  get_user(enabled, &ewp->enabled)
			   || copy_from_user(&wtime, &ewp->time, sizeof(struct rtc_time)) )
				return -EFAULT;

			convert_to_efi_time(&wtime, &eft);

			spin_lock_irqsave(&efi_rtc_lock, flags);
			/*
			 * XXX Fixme:
			 * As of EFI 0.92 with the firmware I have on my
			 * machine this call does not seem to work quite
			 * right
			 */
			status = efi.set_wakeup_time((efi_bool_t)enabled, &eft);

			spin_unlock_irqrestore(&efi_rtc_lock,flags);

			return status == EFI_SUCCESS ? 0 : -EINVAL;

		case RTC_WKALM_RD:

			spin_lock_irqsave(&efi_rtc_lock, flags);

			status = efi.get_wakeup_time((efi_bool_t *)&enabled, (efi_bool_t *)&pending, &eft);

			spin_unlock_irqrestore(&efi_rtc_lock,flags);

			if (status != EFI_SUCCESS) return -EINVAL;

			ewp = (struct rtc_wkalrm __user *)arg;

			if (  put_user(enabled, &ewp->enabled)
			   || put_user(pending, &ewp->pending)) return -EFAULT;

			convert_from_efi_time(&eft, &wtime);

			return copy_to_user(&ewp->time, &wtime,
					    sizeof(struct rtc_time)) ? -EFAULT : 0;
	}
	return -ENOTTY;
}

static int genregs32_get(struct task_struct *target,
			 const struct user_regset *regset,
			 unsigned int pos, unsigned int count,
			 void *kbuf, void __user *ubuf)
{
	const struct pt_regs *regs = target->thread.kregs;
	unsigned long __user *reg_window;
	unsigned long *k = kbuf;
	unsigned long __user *u = ubuf;
	unsigned long reg;

	if (target == current)
		flush_user_windows();

	pos /= sizeof(reg);
	count /= sizeof(reg);

	if (kbuf) {
		for (; count > 0 && pos < 16; count--)
			*k++ = regs->u_regs[pos++];

		reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
		reg_window -= 16;
		for (; count > 0 && pos < 32; count--) {
			if (get_user(*k++, &reg_window[pos++]))
				return -EFAULT;
		}
	} else {
		for (; count > 0 && pos < 16; count--) {
			if (put_user(regs->u_regs[pos++], u++))
				return -EFAULT;
		}

		reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
		reg_window -= 16;
		for (; count > 0 && pos < 32; count--) {
			if (get_user(reg, &reg_window[pos++]) ||
			    put_user(reg, u++))
				return -EFAULT;
		}
	}
	while (count > 0) {
		switch (pos) {
		case 32: /* PSR */
			reg = regs->psr;
			break;
		case 33: /* PC */
			reg = regs->pc;
			break;
		case 34: /* NPC */
			reg = regs->npc;
			break;
		case 35: /* Y */
			reg = regs->y;
			break;
		case 36: /* WIM */
		case 37: /* TBR */
			reg = 0;
			break;
		default:
			goto finish;
		}

		if (kbuf)
			*k++ = reg;
		else if (put_user(reg, u++))
			return -EFAULT;
		pos++;
		count--;
	}
finish:
	pos *= sizeof(reg);
	count *= sizeof(reg);

	return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
					38 * sizeof(reg), -1);
}

static int genregs32_set(struct task_struct *target,
			 const struct user_regset *regset,
			 unsigned int pos, unsigned int count,
			 const void *kbuf, const void __user *ubuf)
{
	struct pt_regs *regs = target->thread.kregs;
	unsigned long __user *reg_window;
	const unsigned long *k = kbuf;
	const unsigned long __user *u = ubuf;
	unsigned long reg;

	if (target == current)
		flush_user_windows();

	pos /= sizeof(reg);
	count /= sizeof(reg);

	if (kbuf) {
		for (; count > 0 && pos < 16; count--)
			regs->u_regs[pos++] = *k++;

		reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
		reg_window -= 16;
		for (; count > 0 && pos < 32; count--) {
			if (put_user(*k++, &reg_window[pos++]))
				return -EFAULT;
		}
	} else {
		for (; count > 0 && pos < 16; count--) {
			if (get_user(reg, u++))
				return -EFAULT;
			regs->u_regs[pos++] = reg;
		}

		reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
		reg_window -= 16;
		for (; count > 0 && pos < 32; count--) {
			if (get_user(reg, u++) ||
			    put_user(reg, &reg_window[pos++]))
				return -EFAULT;
		}
	}
	while (count > 0) {
		unsigned long psr;

		if (kbuf)
			reg = *k++;
		else if (get_user(reg, u++))
			return -EFAULT;

		switch (pos) {
		case 32: /* PSR */
			psr = regs->psr;
			psr &= ~(PSR_ICC | PSR_SYSCALL);
			psr |= (reg & (PSR_ICC | PSR_SYSCALL));
			regs->psr = psr;
			break;
		case 33: /* PC */
			regs->pc = reg;
			break;
		case 34: /* NPC */
			regs->npc = reg;
			break;
		case 35: /* Y */
			regs->y = reg;
			break;
		case 36: /* WIM */
		case 37: /* TBR */
			break;
		default:
			goto finish;
		}

		pos++;
		count--;
	}
finish:
	pos *= sizeof(reg);
	count *= sizeof(reg);

	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
					 38 * sizeof(reg), -1);
}

int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
		unsigned long arg)
{
	struct ext3_inode_info *ei = EXT3_I(inode);
	unsigned int flags;
	unsigned short rsv_window_size;

	ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);

	switch (cmd) {
	case EXT3_IOC_GETFLAGS:
		flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
		return put_user(flags, (int __user *) arg);
	case EXT3_IOC_SETFLAGS: {
		handle_t *handle = NULL;
		int err;
		struct ext3_iloc iloc;
		unsigned int oldflags;
		unsigned int jflag;

		if (IS_RDONLY(inode))
			return -EROFS;

		if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
			return -EACCES;

		if (get_user(flags, (int __user *) arg))
			return -EFAULT;

		if (!S_ISDIR(inode->i_mode))
			flags &= ~EXT3_DIRSYNC_FL;

		oldflags = ei->i_flags;

		/* The JOURNAL_DATA flag is modifiable only by root */
		jflag = flags & EXT3_JOURNAL_DATA_FL;

		/*
		 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
		 * the relevant capability.
		 *
		 * This test looks nicer. Thanks to Pauline Middelink
		 */
		if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
			if (!capable(CAP_LINUX_IMMUTABLE))
				return -EPERM;
		}

		/*
		 * The JOURNAL_DATA flag can only be changed by
		 * the relevant capability.
		 */
		if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
			if (!capable(CAP_SYS_RESOURCE))
				return -EPERM;
		}


		handle = ext3_journal_start(inode, 1);
		if (IS_ERR(handle))
			return PTR_ERR(handle);
		if (IS_SYNC(inode))
			handle->h_sync = 1;
		err = ext3_reserve_inode_write(handle, inode, &iloc);
		if (err)
			goto flags_err;

		flags = flags & EXT3_FL_USER_MODIFIABLE;
		flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
		ei->i_flags = flags;

		ext3_set_inode_flags(inode);
		inode->i_ctime = CURRENT_TIME;

		err = ext3_mark_iloc_dirty(handle, inode, &iloc);
flags_err:
		ext3_journal_stop(handle);
		if (err)
			return err;

		if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
			err = ext3_change_inode_journal_flag(inode, jflag);
		return err;
	}
	case EXT3_IOC_GETVERSION:
	case EXT3_IOC_GETVERSION_OLD:
		return put_user(inode->i_generation, (int __user *) arg);
	case EXT3_IOC_SETVERSION:
	case EXT3_IOC_SETVERSION_OLD: {
		handle_t *handle;
		struct ext3_iloc iloc;
		__u32 generation;
		int err;

		if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
			return -EPERM;
		if (IS_RDONLY(inode))
			return -EROFS;
		if (get_user(generation, (int __user *) arg))
			return -EFAULT;
//.........这里部分代码省略.........

static int wdt_ioctl(struct inode *inode, struct file *file,
    unsigned int cmd, unsigned long arg)
{
    int status;
    int new_options, retval = -EINVAL;
    int new_timeout;
    union {
        struct watchdog_info __user *ident;
        int __user *i;
    } uarg;

    uarg.i = (int __user *)arg;

    switch(cmd)
    {
    default:
        return -ENOTTY;

    case WDIOC_GETSUPPORT:
        return copy_to_user(uarg.ident, &ident, sizeof(ident)) ? -EFAULT : 0;

    case WDIOC_GETSTATUS:
        wdt_get_status(&status);
        return put_user(status, uarg.i);

    case WDIOC_GETBOOTSTATUS:
        return put_user(0, uarg.i);

    case WDIOC_KEEPALIVE:
        wdt_keepalive();
        return 0;

    case WDIOC_SETOPTIONS:
        if (get_user (new_options, uarg.i))
            return -EFAULT;

        if (new_options & WDIOS_DISABLECARD) {
            wdt_stop();
            retval = 0;
        }

        if (new_options & WDIOS_ENABLECARD) {
            wdt_start();
            retval = 0;
        }

        return retval;

    case WDIOC_SETTIMEOUT:
        if (get_user(new_timeout, uarg.i))
            return -EFAULT;

        if (wdt_set_timeout(new_timeout))
            return -EINVAL;

        wdt_keepalive();
        /* Fall */

    case WDIOC_GETTIMEOUT:
        return put_user(timeout, uarg.i);

    }
}