73 lines
2.8 KiB
Groff
73 lines
2.8 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" From: @(#)gethostname.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd September 23, 1994
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.Dt GETBOOTFILE 3
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.Os
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.Sh NAME
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.Nm getbootfile
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.Nd get kernel boot file name
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In paths.h
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.Ft const char *
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.Fn getbootfile void
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.Sh DESCRIPTION
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The
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.Fn getbootfile
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function retrieves the full pathname of the file from which the
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current kernel was loaded, and returns a static pointer to the name.
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A read/write interface to this information is available via the
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.Xr sysctl 3
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MIB variable
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.Dq Li kern.bootfile .
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.Sh RETURN VALUES
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If the call succeeds a string giving the pathname is returned. If it
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fails, a null pointer is returned and an error code is
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placed in the global location
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.Va errno .
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.Sh SEE ALSO
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.Xr sysctl 3
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.Sh BUGS
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If the boot blocks have not been modified to pass this information into
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the kernel at boot time, the static string
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.Dq Pa /kernel
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is returned instead of the real boot file.
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.Sh HISTORY
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The
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.Fn getbootfile
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function call appeared in
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.Fx 2.0 .
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