geometry.c

iscsi源代码 UNH的progect 有initiator端和target端的源码

/*	initiator/geometry.c */

/*	vi: set autoindent tabstop=8 shiftwidth=4 :	*/

/*	Prints "geometry" of a disk, such as "/dev/sda",
	or a partition, such as "/dev/sda1".
	Obtained by using ioct() system calls.
	You must be root to run this.
	Give the list of disks and/or partitions on the command line.
	If nothing given, "/dev/sda" is used as the default.
*/
/*
	Copyright (C) 2001-2003 InterOperability Lab (IOL)
	University of New Hampshier (UNH)
	Durham, NH 03824

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2, or (at your option)
	any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
	USA.

	The name of IOL and/or UNH may not be used to endorse or promote products
	derived from this software without specific prior written permission.
*/

#define _POSIX_C_SOURCE	199506L

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <linux/fs.h>
#include <linux/hdreg.h>

extern int ioctl(int fd, int command, ...);

#define	DEFAULT_DEVICE_NAME	"/dev/sda"

void
do_one_disk(char *name)
{
	int fd;
	struct hd_geometry geo;
	unsigned long size, blocks;

	if ((fd = open(name, O_RDONLY)) < 0) {
		perror(name);
		return;
	}

	if (ioctl(fd, HDIO_GETGEO, &geo) < 0) {
		perror(name);
		close(fd);
		return;
	}

	printf("Geometry for %s\n", name);
	printf("%12s: %u\n", "heads", geo.heads);
	printf("%12s: %u %s\n", "sectors", geo.sectors, "per cylinder");
	printf("%12s: %u %s\n", "cylinders", geo.cylinders, "per head");
	printf("%12s: %lu\n", "start sector", geo.start);

	if (ioctl(fd, BLKGETSIZE, &blocks) < 0) {
		perror(name);
		close(fd);
		return;
	}

	printf("%12s: %lu %s\n", "size", blocks, "sectors total");

	if (ioctl(fd, BLKSSZGET, &size) < 0) {
		perror(name);
		close(fd);
		return;
	}

	printf("%12s: %lu %s\n", "sector size", size, "bytes per sector");
	printf("%12s: %lu %s\n", "size", blocks * size, "bytes total");

	if (close(fd) < 0) {
		perror(name);
		return;
	}
}

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

	if (argc <= 1)
		do_one_disk(DEFAULT_DEVICE_NAME);
	else {
		for (count = 1; count < argc; count++) {
			if (count > 1)
				printf("\n");
			do_one_disk(argv[count]);
		}
	}

	return EXIT_SUCCESS;
}