usr/include/utmp.h

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *      @(#)utmp.h      5.1 (Berkeley) 5/30/85
 */

/*
 * Structure of utmp and wtmp files.
 *
 * Assuming the number 8 is unwise.
 */
struct utmp {
        char    ut_line[8];             /* tty name */
        char    ut_name[8];             /* user id */
        char    ut_host[16];            /* host name, if remote */
        long    ut_time;                /* time on */
};