Path: utzoo!mnetor!uunet!husc6!bloom-beacon!tut.cis.ohio-state.edu!mailrus!ames!hc!beta!unm-la!unmvax!titan!dieter
From: dieter@titan.nmt.edu (Dieter Muller)
Newsgroups: comp.unix.questions
Subject: Re: checking disk space from c program
Message-ID: <156@titan.nmt.edu>
Date: 11 Apr 88 11:20:02 GMT
References: <398@wpg.UUCP> <71@kenobi.UUCP> <3448@csli.STANFORD.EDU>
Reply-To: dieter@titan.UUCP (Dieter Muller)
Organization: New Mexico Tech, Socorro NM
Lines: 67

In article <3448@csli.STANFORD.EDU> gandalf@csli.stanford.edu (Juergen Wagner) writes:
>In article <71@kenobi.UUCP> ford@kenobi.UUCP (Mike Ditto) writes:
>>...
>>Read /etc/mnttab to see what devices are mounted, and use the ustat
>>system call to check the status of each....
>>...
>
>The problem with ustat is that it doesn't exist on BSD systems (even on
>Suns), and the problem with stat is that you can't get the whole 
>information without actually reading the super-block, i.e. without having
>root privileges. Normal users have to stick with "df" pipes thru some
>filter.

If you have a Sun, what's wrong with statfs?  True, it isn't on our
4.3BSD Vax, and it doesn't seem real happy with NFS, but it's there
and it works (SunOS 3.5).

Here's an example:

	Filesystem:  /titan1
	Block size:  1024
	Num blocks:  490369
	Total free:  97943
	Avail free:  48906
	Total nodes: 96256
	Free nodes:  77991

Looks like exactly what was asked for.  Yes, I know all the world's not
a Sun.  The code for this example follows.  I didn't run it as root.

Dieter Muller
----------------
#include <stdio.h>
#include <sys/types.h>
#include <sys/vfs.h>

main ()
{
	struct statfs buffer;

	if (statfs ("/titan1", & buffer) == -1)
	    perror ("/titan1");
	else print_statfs ("/titan1", & buffer);

	exit (0);
}

print_statfs (name, buffer)
char * name;
struct statfs * buffer;
{
	printf ("Filesystem:  %s\n", name);
	printf ("Block size:  %d\n", buffer -> f_bsize);
	printf ("Num blocks:  %d\n", buffer -> f_blocks);
	printf ("Total free:  %d\n", buffer -> f_bfree);
	printf ("Avail free:  %d\n", buffer -> f_bavail);
	printf ("Total nodes: %d\n", buffer -> f_files);
	printf ("Free nodes:  %d\n", buffer -> f_ffree);

	fflush (stdout);
	
	return;
}
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