#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>

uint8_t buffer[512] = { 0 };

int main(int argc, char *argv[])
{
	int fd;
	int ret;

	fd = open(argv[1], O_RDWR);
	if (fd < 0) {
		printf("open failed!\r\n");
		return -1;
	}
	if (!strcmp("read", argv[2])) {
		printf("read data from kernel\r\n");
		ret = read(fd, buffer, sizeof(buffer));
		printf("ret len:%d data:%s\r\n", ret, buffer);
	} else if (!strcmp("write", argv[2])) {
		printf("write data to kernel %s len:%ld\r\n", argv[3], strlen(argv[3]));
		ret = write(fd, argv[3], strlen(argv[3]));
		printf("ret len:%d\r\n", ret);
	} else {
		printf("please input correct para, read/write\r\n");
	}
	close(fd);
	return 0;
}