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Unix Version 7 - man page for utmp (v7 section 5)

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UTMP(5) 										  UTMP(5)

       utmp, wtmp - login records

       #include <utmp.h>

       The  utmp  file allows one to discover information about who is currently using UNIX.  The
       file is a sequence of entries with the following structure declared in the include file:

	      /* Copyright (C) 1993, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
		 This file is part of the GNU C Library.

		 The GNU C Library is free software; you can redistribute it and/or
		 modify it under the terms of the GNU Lesser General Public
		 License as published by the Free Software Foundation; either
		 version 2.1 of the License, or (at your option) any later version.

		 The GNU C Library is distributed in the hope that it will be useful,
		 but WITHOUT ANY WARRANTY; without even the implied warranty of
		 Lesser General Public License for more details.

		 You should have received a copy of the GNU Lesser General Public
		 License along with the GNU C Library; if not, write to the Free
		 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
		 02111-1307 USA.  */

	      #ifndef	_UTMP_H
	      #define	_UTMP_H   1

	      #include <features.h>

	      #include <sys/types.h>


	      /* Get system dependent values and data structures.  */
	      #include <bits/utmp.h>

	      /* Compatibility names for the strings of the canonical file names.  */
	      #define UTMP_FILE   _PATH_UTMP
	      #define UTMP_FILENAME    _PATH_UTMP
	      #define WTMP_FILE   _PATH_WTMP
	      #define WTMP_FILENAME    _PATH_WTMP

	      /* Make FD be the controlling terminal, stdin, stdout, and stderr;
		 then close FD.  Returns 0 on success, nonzero on error.  */
	      extern int login_tty (int __fd) __THROW;

	      /* Write the given entry into utmp and wtmp.  */
	      extern void login (__const struct utmp *__entry) __THROW;

	      /* Write the utmp entry to say the user on UT_LINE has logged out.  */
	      extern int logout (__const char *__ut_line) __THROW;

	      /* Append to wtmp an entry for the current time and the given info.  */
	      extern void logwtmp (__const char *__ut_line, __const char *__ut_name,
			     __const char *__ut_host) __THROW;

	      /* Append entry UTMP to the wtmp-like file WTMP_FILE.  */
	      extern void updwtmp (__const char *__wtmp_file, __const struct utmp *__utmp)

	      /* Change name of the utmp file to be examined.  */
	      extern int utmpname (__const char *__file) __THROW;

	      /* Read next entry from a utmp-like file.  */
	      extern struct utmp *getutent (void) __THROW;

	      /* Reset the input stream to the beginning of the file.  */
	      extern void setutent (void) __THROW;

	      /* Close the current open file.  */
	      extern void endutent (void) __THROW;

	      /* Search forward from the current point in the utmp file until the
		 next entry with a ut_type matching ID->ut_type.  */
	      extern struct utmp *getutid (__const struct utmp *__id) __THROW;

	      /* Search forward from the current point in the utmp file until the
		 next entry with a ut_line matching LINE->ut_line.  */
	      extern struct utmp *getutline (__const struct utmp *__line) __THROW;

	      /* Write out entry pointed to by UTMP_PTR into the utmp file.  */
	      extern struct utmp *pututline (__const struct utmp *__utmp_ptr) __THROW;

	      #ifdef	__USE_MISC
	      /* Reentrant versions of the file for handling utmp files.  */
	      extern int getutent_r (struct utmp *__buffer, struct utmp **__result) __THROW;

	      extern int getutid_r (__const struct utmp *__id, struct utmp *__buffer,
			      struct utmp **__result) __THROW;

	      extern int getutline_r (__const struct utmp *__line,
			     struct utmp *__buffer, struct utmp **__result) __THROW;

	      #endif	/* Use misc.  */


	      #endif /* utmp.h	*/

       This structure gives the name of the special file associated with the user's terminal, the
       user's login name, and the time of the login in the form of time(2).

       The wtmp file records all logins and logouts.  Its format is exactly like utmp except that
       a null user name indicates a logout on the associated terminal.	Furthermore, the terminal
       name  `~'  indicates that the system was rebooted at the indicated time; the adjacent pair
       of entries with terminal names `|' and `}' indicate the system-maintained time just before
       and just after a date command has changed the system's idea of the time.

       Wtmp  is  maintained by login(1) and init(8).  Neither of these programs creates the file,
       so if it is removed record-keeping is turned off.  It is summarized by ac(1).


       login(1), init(8), who(1), ac(1)

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