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#include <utmpx.h>
utmpx and wtmpx hold user and accounting information for commands such as who, write, and login. These files have the following structure as defined by <utmpx.h>:
#define UTMPX_FILE "/var/adm/utmpx"
#define WTMPX_FILE "/var/adm/wtmpx"
#define ut_name ut_user
#define ut_xtime ut_tv.tv_sec
struct utmpx {
char ut_user[32]; /* user login name */
char ut_id[4]; /* inittab id */
char ut_line[32]; /* device name */
/* (console, lnxx) */
pid_t ut_pid; /* process id */
short ut_type; /* type of entry */
struct exit_status ut_exit; /* process termination/exit */
/* status */
struct timeval ut_tv; /* time entry was made */
long ut_session; /* session ID, used for */
/* windowing */
long pad[5]; /* reserved for future use */
short ut_syslen; /* significant length of */
/* ut_host */
/* including terminating null */
char ut_host[257]; /* remote host name */
};
/* 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 */
/* Below are 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 character in length. */
#define RUNLVL_MSG "run-level %c"
#define BOOT_MSG "system boot"
#define OTIME_MSG "old time"
#define NTIME_MSG "new time"
#define MOD_WIN 10