111 lines
2.9 KiB
C
111 lines
2.9 KiB
C
/* $NetBSD: utmp.c,v 1.10 2011/10/15 23:00:02 christos Exp $ */
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/*-
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* Copyright (c) 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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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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* are met:
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: utmp.c,v 1.10 2011/10/15 23:00:02 christos Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <sys/types.h>
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#include <sys/param.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <utmp.h>
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#include <sys/stat.h>
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static struct utmp utmp;
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static FILE *ut;
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static char utfile[MAXPATHLEN] = _PATH_UTMP;
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void
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setutent(void)
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{
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if (ut == NULL)
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return;
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(void)fseeko(ut, (off_t)0, SEEK_SET);
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}
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struct utmp *
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getutent(void)
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{
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if (ut == NULL) {
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struct stat st;
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off_t numentries;
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if ((ut = fopen(utfile, "re")) == NULL)
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return NULL;
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if (fstat(fileno(ut), &st) == -1)
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goto out;
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/*
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* If we have a an old version utmp file bail.
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*/
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numentries = st.st_size / sizeof(utmp);
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if ((off_t)(numentries * sizeof(utmp)) != st.st_size)
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goto out;
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}
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if (fread(&utmp, sizeof(utmp), 1, ut) == 1)
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return &utmp;
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out:
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(void)fclose(ut);
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return NULL;
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}
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void
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endutent(void)
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{
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if (ut != NULL) {
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(void)fclose(ut);
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ut = NULL;
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}
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}
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int
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utmpname(const char *fname)
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{
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size_t len = strlen(fname);
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if (len >= sizeof(utfile))
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return 0;
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/* must not end in x! */
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if (fname[len - 1] == 'x')
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return 0;
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(void)strlcpy(utfile, fname, sizeof(utfile));
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endutent();
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return 1;
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}
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#if defined(__minix) && defined(__weak_alias)
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__weak_alias(getutent, __getutent50)
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#endif
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