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 @(#)kdump.1 8.1 (Berkeley) 6/6/93

.Dd April 2, 2020
.Dt KDUMP 1
.Os
.Sh NAME
.Nm kdump
.Nd display kernel trace data
.Sh SYNOPSIS
.Nm
.Op Fl dElNnRT
.Op Fl e Ar emulation
.Op Fl f Ar file
.Op Fl m Ar maxdata
.Op Fl p Ar pid
.Op Fl t Ar trstr
.Op Fl x | Fl X Ar size
.Op Ar file
.Sh DESCRIPTION
.Nm
displays the kernel trace files produced with
.Xr ktrace 1
in human readable format.
The file

a ktrace.out
in the current directory is displayed, unless either the
.Fl f
option is used, or a file name is supplied as the last argument.

p
The options are as follows:
l -tag -width Fl t Fl d Display all numbers in decimal.
t Fl E Display elapsed timestamps (time since beginning of trace).
t Fl e Ar emulation If an emulation of a process is unknown,
interpret system call maps assuming the named emulation instead of
default "netbsd".
t Fl f Ar file Display the specified file instead of

a ktrace.out .
t Fl l Loop reading the trace file, once the end-of-file is reached, waiting for
more data.
t Fl m Ar maxdata Display at most
.Ar maxdata
bytes when decoding I/O.
t Fl N Suppress system call number-to-name translation.
t 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.
t Fl p Ar pid Only display records from the trace file that are for the indicated pid.
t Fl R Display relative timestamps (time since previous entry).
t Fl T Display absolute timestamps for each entry (seconds since epoch).
t Fl t Ar trstr Restrict display to the specified set of kernel trace points.
The default is to display everything in the file.
See the
.Fl t
option of
.Xr ktrace 1 .
t Fl x Display GIO data in hex and ascii instead of
.Xr vis 3
format.
t Fl X Ar size Same as
.Fl x
but display hex values by groups of
.Ar size
bytes.
Supported values are 1, 2, 4, 8, and 16.
.El
.Sh SEE ALSO
.Xr ioctlprint 1 ,
.Xr ktrace 1
.Sh HISTORY
The
.Nm
command appeared in
x 4.4 .