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+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)core.5	8.3 (Berkeley) 12/11/93
+.\"
+.Dd December 11, 1993
+.Dt CORE 5
+.Os BSD 4
+.Sh NAME
+.Nm core
+.Nd memory image file format
+.Sh SYNOPSIS
+.Fd #include <sys/param.h>
+.Sh DESCRIPTION
+A small number of signals which cause abnormal termination of a process
+also cause a record of the process's in-core state to be written
+to disk for later examination by one of the available debuggers.
+(See
+.Xr sigaction 2 . )
+This memory image is written to a file named
+.Nm programname.core
+in the working directory;
+provided the terminated process had write permission in the directory,
+and provided the abnormality did not cause
+a system crash.
+(In this event, the decision to save the core file is arbitrary, see
+.Xr savecore 8 . )
+.Pp
+The maximum size of a
+.Nm programname.core
+file is limited by
+.Xr setrlimit 2 .
+Files which would be larger than the limit are not created.
+.Pp
+The
+.Nm programname.core
+file consists of the
+.Fa u .
+area, whose size (in pages) is
+defined by the
+.Dv UPAGES
+manifest in the
+.Aq Pa sys/param.h
+file.  The 
+.Fa u .
+area starts with a 
+.Fa user
+structure as given in
+.Aq Pa sys/user.h .
+The remainder of the
+.Nm programname.core
+file consists of the data pages followed by
+the stack pages of the process image.
+The amount of data space image in the
+.Nm programname.core
+file is given (in pages) by the
+variable
+.Fa u_dsize
+in the
+.Fa u .
+area.
+The amount of stack image in the core file is given (in pages) by the
+variable 
+.Fa u_ssize
+in the 
+.Ar u .
+area.
+The size of a ``page'' is given by the constant
+.Dv NBPG
+(also from
+.Aq Pa sys/param.h ) .
+.Sh SEE ALSO
+.Xr adb 1 ,
+.Xr dbx 1 ,
+.Xr gdb 1 ,
+.Xr kgdb 1 ,
+.Xr sigaction 2 ,
+.Xr setrlimit 2
+.Sh HISTORY
+A
+.Nm core
+file format appeared in
+.At v6 .