ex6.c

计算机操作系统的实验作业

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

int main()
{
	int fd;
	size_t num_read;
	int byte_per_sector = 0;
	int sector_per_track = 0;
	int number_of_surface = 0;
	int * pi;
	fd = open("/dev/fd0", O_RDONLY);
	pi = &byte_per_sector;
	lseek (fd, (off_t)11, SEEK_SET);
	num_read = read (fd, (void *)pi, (size_t)2);
	printf ("byte per sector: %d\n", byte_per_sector);
	p1 = &sector_per_track;
	lseek (fd, (off_t)24, SEEK_SET);
	num_read = read (fd, (void*)pi, (size_t)2);
	printf ("sector per track :%d\n", sector_per_track);
	p1 = &number_of_surface;
	lseek (fd, (off_t)26, SEEK_SET);
	num_read = read (fd, (void*)pi, (size_t)2);
	printf ("number of surface :%d\n", number_of_surface);
	return 0;	
}