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. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" From: @(#)gethostname.3 8.1 (Berkeley) 6/4/93 29.\" $FreeBSD: src/lib/libc/gen/getbootfile.3,v 1.6.2.3 2001/12/14 18:33:51 ru Exp $ 30.\" $DragonFly: src/lib/libc/gen/getbootfile.3,v 1.6 2008/09/02 11:50:46 matthias Exp $ 31.\" 32.Dd September 2, 2008 33.Dt GETBOOTFILE 3 34.Os 35.Sh NAME 36.Nm getbootfile 37.Nd get kernel boot file name 38.Sh LIBRARY 39.Lb libc 40.Sh SYNOPSIS 41.In paths.h 42.Ft const char * 43.Fn getbootfile void 44.Sh DESCRIPTION 45The 46.Fn getbootfile 47function retrieves the full pathname of the file from which the 48current kernel was loaded, and returns a static pointer to the name. 49A read/write interface to this information is available via the 50.Xr sysctl 3 51MIB variable 52.Va kern.bootfile . 53.Sh RETURN VALUES 54If the call succeeds a string giving the pathname is returned. If it 55fails, a null pointer is returned and an error code is 56placed in the global location 57.Va errno . 58.Sh SEE ALSO 59.Xr sysctl 3 60.Sh HISTORY 61The 62.Fn getbootfile 63function call appeared in 64.Fx 2.0 . 65.Sh BUGS 66If the boot blocks have not been modified to pass this information into 67the kernel at boot time, the static string 68.Dq Pa /boot/kernel 69is returned instead of the real boot file. 70