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      1 /*	$NetBSD: utmpentry.h,v 1.8 2015/11/21 15:01:43 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #if defined(SUPPORT_UTMPX)
     33 # include <utmpx.h>
     34 # define WHO_NAME_LEN		_UTX_USERSIZE
     35 # define WHO_LINE_LEN		_UTX_LINESIZE
     36 # define WHO_HOST_LEN		_UTX_HOSTSIZE
     37 #elif defined(SUPPORT_UTMP)
     38 # include <utmp.h>
     39 # define WHO_NAME_LEN		UT_NAMESIZE
     40 # define WHO_LINE_LEN		UT_LINESIZE
     41 # define WHO_HOST_LEN		UT_HOSTSIZE
     42 #else
     43 # error Either SUPPORT_UTMPX or SUPPORT_UTMP must be defined!
     44 #endif
     45 
     46 
     47 struct utmpentry {
     48 	char name[WHO_NAME_LEN + 1];
     49 	char line[WHO_LINE_LEN + 1];
     50 	char host[WHO_HOST_LEN + 1];
     51 	struct timeval tv;
     52 	pid_t pid;
     53 	uint16_t term;
     54 	uint16_t exit;
     55 	uint16_t sess;
     56 	uint16_t type;
     57 	struct utmpentry *next;
     58 };
     59 
     60 extern size_t maxname, maxline, maxhost;
     61 extern int etype;
     62 
     63 /*
     64  * getutentries provides a linked list of struct utmpentry and returns
     65  * the number of entries. The first argument, if not null, names an
     66  * alternate utmp(x) file to look in.
     67  *
     68  * The memory returned by getutentries belongs to getutentries. The
     69  * list returned (or elements of it) may be returned again later if
     70  * utmp hasn't changed in the meantime.
     71  *
     72  * endutentries clears and frees the cached data.
     73  */
     74 
     75 size_t getutentries(const char *, struct utmpentry **);
     76 void endutentries(void);
     77