return ret; 

	case RTC_EPOCH_SET32:
		cmd = RTC_EPOCH_SET; 
		break; 
	} 
	return sys_ioctl(fd,cmd,arg); 
} 


#define HANDLE_IOCTL(cmd,handler) { (cmd), (ioctl_trans_handler_t)(handler) }, 
#define COMPATIBLE_IOCTL(cmd) HANDLE_IOCTL(cmd,sys_ioctl)

struct ioctl_trans ioctl_start[] = { 
#include <linux/compat_ioctl.h>
#define DECLARES
#include "compat_ioctl.c"

/* And these ioctls need translation */
/* realtime device */
HANDLE_IOCTL(RTC_IRQP_READ,  rtc32_ioctl)
HANDLE_IOCTL(RTC_IRQP_READ32,rtc32_ioctl)
HANDLE_IOCTL(RTC_IRQP_SET32, rtc32_ioctl)
HANDLE_IOCTL(RTC_EPOCH_READ32, rtc32_ioctl)
HANDLE_IOCTL(RTC_EPOCH_SET32, rtc32_ioctl)
/* take care of sizeof(sizeof()) breakage */
}; 

int ioctl_table_size = ARRAY_SIZE(ioctl_start);

示例#2
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#define HANDLE_IOCTL(cmd,handler) { (cmd), (ioctl_trans_handler_t)(handler) }, 
#define COMPATIBLE_IOCTL(cmd) HANDLE_IOCTL(cmd,sys_ioctl)

struct ioctl_trans ioctl_start[] = { 
#include <linux/compat_ioctl.h>
#define DECLARES
#include "compat_ioctl.c"
COMPATIBLE_IOCTL(HDIO_SET_KEEPSETTINGS)
COMPATIBLE_IOCTL(HDIO_SCAN_HWIF)
COMPATIBLE_IOCTL(BLKRASET)
COMPATIBLE_IOCTL(0x4B50)   /* KDGHWCLK - not in the kernel, but don't complain */
COMPATIBLE_IOCTL(0x4B51)   /* KDSHWCLK - not in the kernel, but don't complain */
COMPATIBLE_IOCTL(FIOQSIZE)

/* And these ioctls need translation */
HANDLE_IOCTL(TIOCGDEV, tiocgdev)
/* realtime device */
HANDLE_IOCTL(RTC_IRQP_READ,  rtc32_ioctl)
HANDLE_IOCTL(RTC_IRQP_READ32,rtc32_ioctl)
HANDLE_IOCTL(RTC_IRQP_SET32, rtc32_ioctl)
HANDLE_IOCTL(RTC_EPOCH_READ32, rtc32_ioctl)
HANDLE_IOCTL(RTC_EPOCH_SET32, rtc32_ioctl)
/* take care of sizeof(sizeof()) breakage */
/* mtrr */
HANDLE_IOCTL(MTRRIOC32_ADD_ENTRY, mtrr_ioctl32)
HANDLE_IOCTL(MTRRIOC32_SET_ENTRY, mtrr_ioctl32)
HANDLE_IOCTL(MTRRIOC32_DEL_ENTRY, mtrr_ioctl32)
HANDLE_IOCTL(MTRRIOC32_GET_ENTRY, mtrr_ioctl32)
HANDLE_IOCTL(MTRRIOC32_KILL_ENTRY, mtrr_ioctl32)
HANDLE_IOCTL(MTRRIOC32_ADD_PAGE_ENTRY, mtrr_ioctl32)
HANDLE_IOCTL(MTRRIOC32_SET_PAGE_ENTRY, mtrr_ioctl32)