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.\" 30.Dd September 23, 1994 31.Dt GETBOOTFILE 3 32.Os 33.Sh NAME 34.Nm getbootfile 35.Nd get kernel boot file name 36.Sh LIBRARY 37.Lb libc 38.Sh SYNOPSIS 39.In paths.h 40.Ft const char * 41.Fn getbootfile void 42.Sh DESCRIPTION 43The 44.Fn getbootfile 45function retrieves the full pathname of the file from which the 46current kernel was loaded, and returns a static pointer to the name. 47A read/write interface to this information is available via the 48.Xr sysctl 3 49MIB variable 50.Dq Li kern.bootfile . 51.Sh RETURN VALUES 52If the call succeeds a string giving the pathname is returned. 53If it 54fails, a null pointer is returned and an error code is 55placed in the global location 56.Va errno . 57.Sh SEE ALSO 58.Xr sysctl 3 59.Sh HISTORY 60The 61.Fn getbootfile 62function appeared in 63.Fx 2.0 . 64.Sh BUGS 65If the boot blocks have not been modified to pass this information into 66the kernel at boot time, the static string 67.Dq Pa /boot/kernel/kernel 68is returned instead of the real boot file. 69