04-11-2008
if du -k /var gives a different result to du -xk /var then you may have some data being left behind at the mount point /var/run. How you get to it will be OS dependent, but you will probably want to bring the machine to single user mode, and turn off as many services as you can. Then try umount /var/run. If it unmounts then have a look at the mount point to see if there is any data there (ls -l /var/run). If so, delete it and remount the partition.
Though, it is very strange that du gives a different usage result to df.
btw the -x switch to du keeps it on the starting filesystem, so it shouldn't go off into the mounted /var/run.
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LOGIN(3) BSD Library Functions Manual LOGIN(3)
NAME
login, logout, logwtmp -- login utility functions (DEPRECATED)
SYNOPSIS
#include <util.h>
void
login(struct utmp *ut);
int
logout(const char *line);
void
logwtmp(const char *line, const char *name, const char *host);
DESCRIPTION
The login(), logout(), and logwtmp() functions are DEPRECATED; use pututxline(3) instead.
These functions operate on the database of current users in /var/run/utmpx and the system log file. Superuser permission is required.
The login() function updates the /var/run/utmpx files with user information contained in ut (after converting to a struct utmpx, as described
in pututxline(3)).
The logout() function removes the entry from /var/run/utmpx corresponding to the device line.
The logwtmp() function adds an entry to the system log file. Since login() will add the appropriate entry during a login, logwtmp() is usu-
ally used for logouts.
RETURN VALUES
logout() returns non-zero if it was able to find and delete an entry for line, and zero if there is no entry for line in /var/run/utmpx.
However, there is no error indication due to lack of permissions.
FILES
/dev/*
/var/run/utmpx
SEE ALSO
pututxline(3), utmp(5), utmpx(5)
BSD
December 14, 1995 BSD