drvtest.c~

来自「刚学LINUX驱动模块时写的一个测试程序」· C~ 代码 · 共 51 行

#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <linux/ioctl.h>

//#include "drv.h"

static int fd = -1;
static int d;

#define MAJOR_NUM 125

#define IOCTL_SET_MSG _IOR(MAJOR_NUM, 0, int*)

int main(int argc, char **argv)
{
	int ret;
       int i;
       char buf[6];
	
	fd=open("/dev/drvtest",O_RDWR);
	if(fd<0) 
	{
		printf("Can't open\n");
		return -1;
	}
	else
	{
		printf("open OK %x\n", fd);
	}

	//while(1)
	//{
		printf("enter a number:\n");
		//scanf("%d", &d);
                
		ret = ioctl(fd, IOCTL_SET_MSG, &d);
		
		ret = write(fd, "abc123", 6);
                //ret = read(fd, &d, 4);
                ret = read(fd, buf, 10);
                 for(i=0;i<6;i++)
                 printf("Num is:%c\n",buf[i]);
                     printf("\n");
                 close(fd);
  	//}
     	return 0;
}