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+.\"	$OpenBSD: kdump.1,v 1.40 2023/12/15 15:12:08 deraadt Exp $
+.\"
+.\" Copyright (c) 1990, 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. 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.
+.\"
+.\"	from: @(#)kdump.1	8.1 (Berkeley) 6/6/93
+.\"
+.Dd $Mdocdate: December 15 2023 $
+.Dt KDUMP 1
+.Os
+.Sh NAME
+.Nm kdump
+.Nd display kernel trace data
+.Sh SYNOPSIS
+.Nm kdump
+.Op Fl dHlnRTXx
+.Op Fl f Ar file
+.Op Fl m Ar maxdata
+.Op Fl P Ar program
+.Op Fl p Ar pid
+.Op Fl t Ar trstr
+.Op Fl u Ar label
+.Sh DESCRIPTION
+.Nm
+displays the kernel trace files produced with
+.Xr ktrace 1
+in human-readable format.
+By default, the file
+.Pa ktrace.out
+in the current directory is displayed, unless overridden by the
+.Fl f
+option.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl d
+Display all numbers in decimal.
+By default, values are printed out in hexadecimal.
+.It Fl f Ar file
+Display the specified file instead of
+.Pa ktrace.out .
+Specifying
+.Sq -
+will read from standard input.
+.It Fl H
+Display thread identifiers.
+.It Fl l
+Loop reading the trace file, once the end-of-file is reached, waiting for
+more data.
+.It Fl m Ar maxdata
+Display at most
+.Ar maxdata
+bytes when decoding I/O.
+.It Fl n
+Suppress ad hoc translations.
+Normally
+.Nm
+tries to decode many system calls into a more human-readable format.
+For example,
+.Xr ioctl 2
+values are replaced with the macro name and
+.Va errno
+values are replaced with the
+.Xr strerror 3
+string.
+Suppressing this feature yields a more consistent output format and is
+easily amenable to further processing.
+.It Fl P Ar program
+Show output only for processes with
+.Ar program
+as their command name.
+.It Fl p Ar pid
+Show output only for the
+.Ar pid
+specified.
+.It Fl R
+Display relative timestamps (time since previous entry).
+.It Fl T
+Display absolute timestamps for each entry (seconds since the Epoch).
+.It Fl TR
+If both options are specified, display timestamps relative to trace start.
+.It Fl t Ar trstr
+Select which tracepoints to display.
+The argument can contain one or more of the following letters.
+By default all trace points except for
+.Cm X
+are enabled.
+.Pp
+.Bl -tag -width flag -offset indent -compact
+.\" Keep this list in sync with ktrace(1) and ltrace(1).
+.It Cm c
+trace system calls
+.It Cm i
+trace I/O
+.It Cm n
+trace namei translations
+.It Cm p
+trace violation of
+.Xr pledge 2
+restrictions
+.It Cm s
+trace signal processing
+.It Cm S
+trace violation of
+.Xr pinsyscalls 2
+.It Cm t
+trace various structures
+.It Cm u
+trace user data coming from
+.Xr utrace 2
+.It Cm x
+trace argument vector in
+.Xr execve 2
+.It Cm X
+trace environment in
+.Xr execve 2
+.It Cm +
+trace the default points
+.El
+.It Fl u Ar label
+Display
+.Xr utrace 2
+tracepoints having
+.Xr utrace 2
+label
+.Ar label
+as strings with
+.Xr vis 3
+escaping, without
+.Xr ktrace 2
+header information.
+.It Fl X
+Display I/O data with hexadecimal data and printable ASCII characters
+side by side.
+.It Fl x
+Display I/O data in hexadecimal.
+.El
+.Pp
+The
+.Fl t
+and
+.Fl u
+options are mutually exclusive;
+the last one specified overrides any previous ones.
+.Sh FILES
+.Bl -tag -width ktrace.out -compact
+.It Pa ktrace.out
+default ktrace dump file
+.El
+.Sh SEE ALSO
+.Xr ktrace 1
+.Sh HISTORY
+The
+.Nm
+command appeared in
+.Bx 4.3 Reno .