NAME
wtmps, btmps — user login information
SYNOPSIS
#include <sys/types.h>
#include <utmps.h>
DESCRIPTION
wtmps
and
btmps
hold user and accounting information for such commands as
last,
who,
write,
and
login
(see
last(1),
who(1),
write(1),
and
login(1)).
File
btmps
contains bad login entries for each invalid logon attempt.
File
wtmps
contains a record for all logins and logouts apart from accounting records.
These files contain
utmps-like
structure, the key elements of the structure are given below:
char ut_user[] User login name
char ut_id[] Unique Id to distinguish an entry
char ut_line[] Device name
pid_t ut_pid Process Id
short ut_type Type of Entry
struct ut_exit The exit status of a process
struct timeval ut_tv Time entry was made
char ut_host[] Host name, if remote
uint8_t ut_addr[] Internet Address of the Host,
if remote
short ut_addr_type Flag to identify type of address
in ut_addr
#define WTMPS_FILE "/var/adm/wtmps"
#define BTMPS_FILE "/var/adm/btmps"
Note that
wtmps
and
btmps
tend to grow without bound, and should be checked regularly.
Information that is no longer useful should be
removed periodically to prevent the file from becoming too large.
Also note that
wtmps
and
btmps
are not created by the programs that maintain them.
Thus, if these files are removed, login record-keeping is turned off.
AUTHOR
wtmps
and
btmps
were developed by Hewlett-Packard Company.
FILES
/var/adm/wtmps
/var/adm/btmps
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