main.c

linux char device driver programming

#include <stdio.h>
#include <stdlib.h>
#include <string.h>


int main(int argc, char **argv)
{
   int fd,i;
        
    char temp[20];
    printf("-user test program-\n");	
    FILE *f_op=fopen("/dev/my_devfs","r");

   if(f_op == NULL)
     printf("open error!!!\n"); 
    
     i=fread(temp,sizeof(temp),1,f_op);
      
     printf("i: %d\n",i);   
     printf("read: %s\n",temp);

     fclose(f_op);

  return 0;	

}