UTMP(4) — HP-UX

NAME

utmp, wtmp, btmp − utmp, wtmp, btmp entry format

SYNOPSIS

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

DESCRIPTION

These files, which hold user and accounting information for such commands as last(1), who(1), write(1), and login(1), have the following structure as defined by <utmp.h>:

#define UTMP_FILE	"/etc/utmp"
#define WTMP_FILE	"/etc/wtmp"
#define BTMP_FILE	"/etc/btmp"
#define ut_name	ut_user

structutmp {

char	ut_user[8];	/∗ User login name ∗/
char	ut_id[4];	/∗ /etc/inittab id (usually line #) ∗/
char	ut_line[12];	/∗ device name (console, lnxx) ∗/
short	ut_pid;	/∗ process id ∗/
short	ut_type;	/∗ type of entry ∗/
struct	exit_status {
	short	e_termination;	/∗ Process termination status ∗/
	short	e_exit;	/∗ Process exit status ∗/
	} ut_exit;	/∗ The exit status of a process
			/∗ marked as DEAD_PROCESS. ∗/
time_t	ut_time;	/∗ time entry was made ∗/

};
/∗ Definitions for ut_type ∗/

#define	EMPTY	0
#define	RUN_LVL	1
#define	BOOT_TIME	2
#define	OLD_TIME	3
#define	NEW_TIME	4
#define	INIT_PROCESS	5	/∗ Process spawned by "init" ∗/
#define	LOGIN_PROCESS	6	/∗ A "getty" process waiting for login ∗/
#define	USER_PROCESS	7	/∗ A user process ∗/
#define	DEAD_PROCESS	8
#define	ACCOUNTING	9
#define	UTMAXTYPE	ACCOUNTING	/∗ Largest legal value of ut_type ∗/

/∗ Special strings or formats used in the "ut_line" field when ∗/
/∗ accounting for something other than a process ∗/
/∗ No string for the ut_line field can be more than 11 chars + ∗/
/∗ a NULL in length ∗/

#define RUNLVL_MSG	"run−level %c"
#define BOOT_MSG	"system boot"
#define OTIME_MSG	"old time"
#define NTIME_MSG	"new time"

File btmp contains bad login entries for each invalid logon attempt.

Note that wtmp and btmp tend to grow without bound, and should be checked regularly. Information that is no longer useful should be removed periodically to prevent it from becoming too large.

FILES

/etc/utmp
/etc/wtmp
/etc/btmp

AUTHOR

Btmp was developed by the Hewlett-Packard Company, and the University of California, Berkeley California, Computer Science Division, Department of Electrical Engineering and Computer Science.

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