/*
 * Sample program for ustat system call - No.62
 *
 * ustat - get file system statistics
 *
 * Synopsis
 *     #include <sys/types.h>
 *     #include <unistd.h>
 *     #include <ustat.h>
 *
 *     int ustat(dev_t dev, struct ustat *ubuf);
 *
 * Description
 *     ustat returns information about a mounted file system.
 *     dev is a device number identifying a device containing a
 *     mounted file system. ubuf is a pointer to a ustat structure
 *     that contains the following members:
 *
 *         daddr_t f_tfree;                * Total free blocks *
 *         ino_t   f_tinode;               * Number of free inodes *
 *         char    f_fname[6];             * Filsys name *
 *         char    f_fpack[6];             * Filsys pack name *
 *
 *     The last two fields, f_fname anf f_fpack, are not implemented
 *     and will always be filled with null characters.
 *
 * Retrun value
 *     On success, zero is returned and the ustat structure
 *     pointed to bye ubuf will be filled in. On error, -1 is
 *     is returned, and errno is set appropriately.
 *
 * Notes
 *     ustat has only been provided for compatibility. All new
 *     programs should use statfs(2) instead.
 *
 * Types
 *  in <bits/types.h>
 *    struct dev_t
 *      {
 *        unsigned long __val[2];
 *      }
 *
 *   in <ustat.h>
 *     struct ustat
 *       {
 *         daddr_t f_tfree;
 *         ino_t f_tinode;
 *         char f_fname[6];
 *         char f_fpack[6];
 *       };
 *
 * Macros
 *   in <sysmacros.h>
 *     major(dev)
 *     minor(dev)
 *     makedev(major, minor)
 */

#include <stdio.h>
#include <ustat.h>

main()
{
	struct ustat fs_stat;
	dev_t dev_num;
	int m, n;

	printf("major number = ");
	scanf("%d", &m);
	printf("minor number = ");
	scanf("%d", &n);

	dev_num = makedev(m, n);

	ustat(dev_num, &fs_stat);

	printf("f_tfree = %d\n", fs_stat.f_tfree);
	printf("f_tinode = %lu\n", fs_stat.f_tinode);
	printf("f_fname = %s\n", fs_stat.f_fname);
	printf("f_fpack = %s\n", fs_stat.f_fpack);

	exit(0);
}