Driver-tutorial/ioctl/ioctl_app.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include "ioctl_const.h"

int main(){

    int fd;
    int32_t value , number;
    
    printf("\nOpening Driver\n");
    fd = open("/dev/demo_ioctl_device", O_RDWR);
    if( fd < 0 ){
        printf("Cannot open device file...\n");
        return 0;
    }

    printf("Enter the Value to send\n");
    scanf("%d", &number);
    printf("Writing Value to Driver\n");
    ioctl(fd, WR_VALUE, (int32_t*) &number);

    printf("Reading Value from Driver\n");
    ioctl(fd, RD_VALUE, (int32_t*) &value);
    printf("Value is %d\n", value);

    printf("Closing Driver\n");
    close(fd); 
    return 0;
}