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.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
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.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 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.
.\"
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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
.Fd #include <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 BUGS
If the boot blocks have not been modified to pass this information into
the kernel at boot time, the static string
.Dq Pa /kernel
is returned instead of the real boot file.
.Sh HISTORY
The
.Fn getbootfile
function call appeared in
.Fx 2.0 .
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