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Hi Andrew!

Attached is my try for a getbootfile(3) function and a matching man
page for libutil. Please comment.

libutil minor will have to be bumped for this change, correct?

Bye,
 Thomas

-- 
Thomas Klausner - wiz@danbala.tuwien.ac.at
To live for some future goal is shallow. It's the sides of the mountain
that sustain life, not the top. -- Robert M. Pirsig

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.\"	$NetBSD$
.\"
.\" Copyright (c) 2000 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Thomas Klausner.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"        This product includes software developed by the NetBSD
.\"        Foundation, Inc. and its contributors.
.\" 4. Neither the name of The NetBSD Foundation nor the names of its
.\"    contributors may be used to endorse or promote products derived
.\"    from this software without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd Dec 16, 2000
.Dt GETBOOTFILE 3
.Os
.Sh NAME
.Nm getbootfile
.Nd get the name of the booted kernel file
.Sh LIBRARY
.Lb libutil
.Sh SYNOPSIS
.Fd #include <util.h>
.Ft const char *
.Fn getbootfile void
.Sh DESCRIPTION
.Fn getbootfile
returns a static pointer to the full path name of the file from which
the current kernel was loaded. If it can not be determined, or the
file is not ``secure'' (see
.Xr secure_path 3 ) ,
.Dv _PATH_UNIX
from
.Pa Aq paths.h
is returned instead.
.Sh SEE ALSO
.Xr secure_path 3 ,
.Xr sysctl 3
.Sh HISTORY
The
.Nm
function call appeared in
.Fx 2.0 .

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/*	$NetBSD$	*/

/*-
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Thomas Klausner.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD$");
#endif

#include <sys/param.h>
#include <sys/sysctl.h>
#include <machine/cpu.h>
#include <paths.h>
#include <util.h>

#ifdef CPU_BOOTED_KERNEL
static char name[MAXPATHLEN]; 
#endif

const char *
getbootfile(void)
{
#ifdef CPU_BOOTED_KERNEL
	int mib[2];
	size_t size;
#endif
	const char *kernel;

	kernel = _PATH_UNIX;
#ifdef CPU_BOOTED_KERNEL
	/* find real boot-kernel name */
	mib[0] = CTL_MACHDEP;
	mib[1] = CPU_BOOTED_KERNEL;
	size = sizeof(name) - 1;
	if (sysctl(mib, 2, name + 1, &size, NULL, NULL) == 0) {
		/*
		 * traditionally, this sysctl returns the relative
		 * path of the kernel with the leading slash stripped
		 * -- could be empty, though (e.g. when netbooting).
		 */
		if (name[1] != '\0') {
			name[0] = '/';
			kernel = name;
		}

		/* check if we got a valid and 'secure' filename */
		if (secure_path(kernel) != 0) {
			/* doesn't seems so, fall back to default */
			kernel = _PATH_UNIX;
		}
	}
#endif

	return (kernel);
}

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