gistfile1.c

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

int main(int argc, char *argv[])
{
	int fd = open("/dev/spi_driver", O_RDONLY);
	if (fd < 0)
		strerror(errno);
}