NetBSD/share/man/man5/core.5

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.\" $NetBSD: core.5,v 1.4 1994/11/30 19:31:11 jtc Exp $
.\"
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.\" @(#)core.5 8.3 (Berkeley) 12/11/93
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.\"
.Dd December 11, 1993
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.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.
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(See
.Xr sigaction 2 . )
This memory image is written to a file named
.Nm programname.core
in the working directory;
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provided the terminated process had write permission in the directory,
and provided the abnormality did not cause
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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
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file is limited by
.Xr setrlimit 2 .
Files which would be larger than the limit are not created.
.Pp
The
.Nm programname.core
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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
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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
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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
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file format appeared in
.At v6 .