1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" From: @(#)gethostname.3 8.1 (Berkeley) 6/4/93 33.\" $FreeBSD$ 34.\" 35.Dd September 23, 1994 36.Dt GETBOOTFILE 3 37.Os 38.Sh NAME 39.Nm getbootfile 40.Nd get kernel boot file name 41.Sh LIBRARY 42.Lb libc 43.Sh SYNOPSIS 44.In paths.h 45.Ft const char * 46.Fn getbootfile void 47.Sh DESCRIPTION 48The 49.Fn getbootfile 50function retrieves the full pathname of the file from which the 51current kernel was loaded, and returns a static pointer to the name. 52A read/write interface to this information is available via the 53.Xr sysctl 3 54MIB variable 55.Dq Li kern.bootfile . 56.Sh RETURN VALUES 57If the call succeeds a string giving the pathname is returned. 58If it 59fails, a null pointer is returned and an error code is 60placed in the global location 61.Va errno . 62.Sh SEE ALSO 63.Xr sysctl 3 64.Sh HISTORY 65The 66.Fn getbootfile 67function appeared in 68.Fx 2.0 . 69.Sh BUGS 70If the boot blocks have not been modified to pass this information into 71the kernel at boot time, the static string 72.Dq Pa /boot/kernel/kernel 73is returned instead of the real boot file. 74