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.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
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.\" 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.
.\" 4. Neither the name of the University 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 REGENTS 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
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\"
.\" From: @(#)gethostname.3 8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
.Dd September 23, 1994
.Dt GETBOOTFILE 3
.Os
.Sh NAME
.Nm getbootfile
.Nd get kernel boot file name
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In paths.h
.Ft const char *
.Fn getbootfile void
.Sh DESCRIPTION
The
.Fn getbootfile
function retrieves the full pathname of the file from which the
current kernel was loaded, and returns a static pointer to the name.
A read/write interface to this information is available via the
.Xr sysctl 3
MIB variable
.Dq Li kern.bootfile .
.Sh RETURN VALUES
If the call succeeds a string giving the pathname is returned.
If it
fails, a null pointer is returned and an error code is
placed in the global location
.Va errno .
.Sh SEE ALSO
.Xr sysctl 3
.Sh HISTORY
The
.Fn getbootfile
function appeared in
.Fx 2.0 .
.Sh BUGS
If the boot blocks have not been modified to pass this information into
the kernel at boot time, the static string
.Dq Pa /boot/kernel/kernel
is returned instead of the real boot file.
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