1. 根目录:
2. arch
3. um
4. drivers
5. slip.h

#ifndef __UM_SLIP_H
#define __UM_SLIP_H

#include "slip_common.h"

struct slip_data {
	void *dev;
	char name[sizeof("slnnnnn\0")];
	char *addr;
	char *gate_addr;
	int slave;
	struct slip_proto slip;
};

extern const struct net_user_info slip_user_info;

extern int slip_user_read(int fd, void *buf, int len, struct slip_data *pri);
extern int slip_user_write(int fd, void *buf, int len, struct slip_data *pri);

#endif