Free space on a file system

[john at vpk1.UUCP]

In article <3394 at sactoh0.UUCP> Jay A. Konigsberg writes
>In article <797 at massey.ac.nz> GEustace at massey.ac.nz (Glen Eustace) writes:
>>We are trying to write some code that will check whether a file will
>>fit on a given file system prior to copying it.  It would be great if
>>the information given in a 'df' were available with some system call.
>>Does anyone know whether there is one and if so how one uses it.
>>
>This looks like a job for the stat() system call. (Sys V)

Nope...I'm afraid that just won't do it. The stat() system call
performs on 'FILES' not 'FILE SYSTEMS'. You were very close though.
The call that Glen is looking for is ustat() (Unix SysV)

#include <sys/types.h>
#include <ustat.h>

int ustat (dev, buf)
int dev;
struct ustat *buf;

where 'dev' is a device number of a device containing the file system
in question (mounted) and buf is a pointer to a structure containing
the following:

	daddr_t	f_tfree;	/* Total free blocks*/
	ino_t	f_tinode;	/* Number of free inodes */
	char	f_fname[6];	/* Name of file system */
	char	f_fpack[6];	/* File system pack name */

All of this is documented in the Unix Programmer's Reference Manual
available from AT&T:

	Order Code: 307-013

	by phone: 1-800-432-6600 (continental US)
		  1-317-352-8557 (outside cont. US)

Last time I checked it was going for about $50 US.

				Good Luck!

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