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* Portions Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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* Portions Copyright (c) 1996, Jason Downs. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* From: OpenBSD: logutmp.c,v 1.1 1996/06/18 10:09:23 downsj Exp
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* From: OpenBSD: logutmp.c,v 1.2 1998/07/13 02:11:17 millert Exp
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char logutmp_rcsid[] =
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"$Id: logutmp.c,v 1.4 1999/07/16 01:12:54 dholland Exp $";
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#include <sys/types.h>
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typedef struct utmp UTMP;
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static int topslot = -1;
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* Special versions of login()/logout() which hold the utmp file open,
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* First, loop through /etc/ttys, if needed, to initialize the
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* top of the tty slots, since ftpd has no tty.
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while (getttyent() != (struct ttyent *)NULL)
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if ((topslot < 0) || ((fd < 0)
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&& (fd = open(_PATH_UTMP, O_RDWR|O_CREAT, 0644)) < 0))
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* Now find a slot that's not in use...
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(void)lseek(fd, (off_t)(topslot * sizeof(UTMP)), SEEK_SET);
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if (read(fd, &ubuf, sizeof(UTMP)) == sizeof(UTMP)) {
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if (!ubuf.ut_name[0]) {
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(void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR);
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(void)lseek(fd, (off_t)(topslot * sizeof(UTMP)), SEEK_SET);
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(void)write(fd, ut, sizeof(UTMP));
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logout(register const char *line)
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(void)lseek(fd, 0, SEEK_SET);
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while (read(fd, &ut, sizeof(UTMP)) == sizeof(UTMP)) {
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|| strncmp(ut.ut_line, line, UT_LINESIZE))
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bzero(ut.ut_name, UT_NAMESIZE);
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bzero(ut.ut_host, UT_HOSTSIZE);
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(void)time(&ut.ut_time);
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(void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR);
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(void)write(fd, &ut, sizeof(UTMP));