1.\" Copyright (c) 1990, 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.\" @(#)kdump.1 8.1 (Berkeley) 6/6/93 29.\" $FreeBSD: src/usr.bin/kdump/kdump.1,v 1.5.2.2 2001/08/16 13:16:51 ru Exp $ 30.\" 31.Dd April 4, 2023 32.Dt KDUMP 1 33.Os 34.Sh NAME 35.Nm kdump 36.Nd display kernel trace data 37.Sh SYNOPSIS 38.Nm 39.Op Fl acdjnlRT 40.Op Fl f Ar file 41.Op Fl m Ar maxdata 42.Op Fl t Op cnisuwy 43.Op Fl p Ar pid 44.Sh DESCRIPTION 45The 46.Nm 47command displays the kernel trace files produced with 48.Xr ktrace 1 49in human readable format. 50By default, the file 51.Pa ktrace.out 52in the current directory is displayed, which may be overridden by the 53.Fl f 54option. 55.Pp 56The options are as follows: 57.Bl -tag -width Fl 58.It Fl a 59Display full human readable output. 60This option turns on 61.Fl c 62and 63.Fl R . 64.It Fl c 65Display the cpu the thread is executing on. 66.It Fl d 67Display all numbers in decimal. 68.It Fl j 69Use a fixed format output, otherwise a more human readable output is used. 70.It Fl f Ar file 71Display the specified file instead of 72.Pa ktrace.out . 73.It Fl l 74Loop reading the trace file, once the end-of-file is reached, waiting for 75more data. 76.It Fl m Ar maxdata 77Display at most 78.Ar maxdata 79bytes when decoding I/O; set to 80.Cm 0 81to disable the size limit. 82.It Fl p Ar pid 83Display only records for process 84.Ar pid . 85.It Fl n 86Suppress ad hoc translations. 87Normally 88.Nm 89tries to decode many system calls into a more human readable format. 90For example, 91.Xr ioctl 2 92values are replaced with the macro name and 93.Va errno 94values are replaced with the 95.Xr strerror 3 96string. 97Suppressing this feature yields a more consistent output format and is 98easily amenable to further processing. 99.It Fl R 100Display relative timestamps (time since previous entry). 101.It Fl T 102Display absolute timestamps for each entry (seconds since epoch). 103.It Fl t Ar cnisuwy 104See the 105.Fl t 106option of 107.Xr ktrace 1 . 108.El 109.Sh FILES 110.Bl -tag -width ktrace.out -compact 111.It Pa ktrace.out 112default ktrace dump file 113.El 114.Sh SEE ALSO 115.Xr ktrace 1 116.Sh HISTORY 117The 118.Nm 119command appeared in 120.Bx 4.4 . 121