main.h


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#ifndef _HELLOMAIN_H_
#define _HELLOMAIN_H_

#include <linux/cdev.h>

#ifndef HELLO_MAJOR
#define HELLO_MAJOR 0 /* let kernel choose, unless user really defined it */
#endif

#define HELLO_KERNEL_BUFF_LEN 1024

extern int hello_major;
extern int hello_minor;

extern char *magicstr;

struct hello_dev {
    dev_t devnum;
    struct semaphore sem;
    struct cdev cdev; /* char device */

    /* for r/w operations */
    char hello_buffer[HELLO_KERNEL_BUFF_LEN];
    size_t buff_index;
};

/* function prototypes */
int hello_debugfs(void);

#endif