1.\" $OpenBSD: kdump.1,v 1.22 2012/04/10 20:39:37 mikeb Exp $ 2.\" 3.\" Copyright (c) 1990, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" from: @(#)kdump.1 8.1 (Berkeley) 6/6/93 31.\" 32.Dd $Mdocdate: April 10 2012 $ 33.Dt KDUMP 1 34.Os 35.Sh NAME 36.Nm kdump 37.Nd display kernel trace data 38.Sh SYNOPSIS 39.Nm kdump 40.Bk -words 41.Op Fl dHlnRrTXx 42.Op Fl e Ar emulation 43.Op Fl f Ar file 44.Op Fl m Ar maxdata 45.Op Fl p Ar pid 46.Op Fl t Op ceinsw 47.Ek 48.Sh DESCRIPTION 49.Nm 50displays the kernel trace files produced with 51.Xr ktrace 1 52in human-readable format. 53By default, the file 54.Pa ktrace.out 55in the current directory is displayed, unless overridden by the 56.Fl f 57option. 58.Pp 59The options are as follows: 60.Bl -tag -width Ds 61.It Fl d 62Display all numbers in decimal. 63By default, values are printed out in hexadecimal. 64.It Fl e Ar emulation 65Interpret system call maps assuming the named emulation instead of 66.Qq bsd . 67For example, to view trace output from a Linux binary, use 68.Fl e Ar linux . 69.It Fl f Ar file 70Display the specified file instead of 71.Pa ktrace.out . 72.It Fl H 73Display thread identifiers. 74.It Fl l 75Loop reading the trace file, once the end-of-file is reached, waiting for 76more data. 77.It Fl m Ar maxdata 78Display at most 79.Ar maxdata 80bytes when decoding I/O. 81.It Fl n 82Suppress ad hoc translations. 83Normally 84.Nm 85tries to decode many system calls into a more human-readable format. 86For example, 87.Xr ioctl 2 88values are replaced with the macro name and 89.Va errno 90values are replaced with the 91.Xr strerror 3 92string. 93Suppressing this feature yields a more consistent output format and is 94easily amenable to further processing. 95.It Fl p Ar pid 96Show output only for the 97.Ar pid 98specified. 99.It Fl R 100Display relative timestamps (time since previous entry). 101.It Fl r 102When decoding the name in 103.Xr sysctl 3 104CALL records or structure members in STRU records 105(UIDs, GIDs, dates, etc), 106display symbolically instead of numerically. 107.It Fl T 108Display absolute timestamps for each entry (seconds since the Epoch). 109.It Fl t Op ceinstw 110Selects which tracepoints to display. 111See the 112.Fl t 113option of 114.Xr ktrace 1 115for the definitions of the flags. 116.It Fl X 117Display I/O data with hexadecimal data and printable ASCII characters 118side by side. 119.It Fl x 120Display I/O data in hexadecimal. 121.El 122.Sh FILES 123.Bl -tag -width ktrace.out -compact 124.It Pa ktrace.out 125default ktrace dump file 126.El 127.Sh SEE ALSO 128.Xr ktrace 1 129.Sh HISTORY 130The 131.Nm 132command appeared in 133.Bx 4.4 . 134