solidapp.c

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

#define DEVICE "/dev/solidusdevice"

int main(){
    int i, fd; //file description
    char ch, write_buf[100], read_buf[100];

    fd = open(DEVICE,O_RDWR);  //open for reading and writing
    if (fd==-1){
        printf("file %s either does not exist or has been locked by another process\n",DEVICE);
        exit(-1);
    }
    printf("r = read from device\nw=writing to device\nenter command: ");
    scanf("%c",&ch);
    switch(ch){
        case 'w':{
                printf("enter data: ");
                char tmp;
                scanf("%c",&tmp);
                scanf("%[^\n]",write_buf);
                // printf("after\n");
                write(fd,write_buf,sizeof(write_buf));
                // printf("after2\n");
                break;
            }
        case 'r':{
                // read(fd,read_buf,sizeof(read_buf));
                // printf("device: %s\n",read_buf);
                int randNumber=read(fd,read_buf,sizeof(read_buf));
                printf("The random Number: %d\n",randNumber);
                break;
            }
        default:
                printf("command not recognized\n");
                break;
    }
    close(fd);

    return 0;
}