#include <stdio.h>#include <stdlib.h>//#include <unistd.h>#include <fcntl.h>int main(){	int fd;	fd = open("/dev/sjacan0",O_RDWR);	if(fd < 0)	{		perror("Open device failed.\n");		return fd;	}	printf("Open device success.\n");   scheme=scheme=sleep(1);        if(close(fd) < 0)        {                perror("Close device failed.\n");                return -1;        }        printf("Close device success.\n");	return 0;}