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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
Pa 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.
Pp
The options are as follows:
Bl -tag -width Fl
It Fl d
Display all numbers in decimal.
It Fl E
Display elapsed timestamps (time since beginning of trace).
It Fl e Ar emulation
If an emulation of a process is unknown,
interpret system call maps assuming the named emulation instead of
default "netbsd".
It Fl f Ar file
Display the specified file instead of
Pa ktrace.out .
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 system call number-to-name translation.
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 pid
Only display records from the trace file that are for the indicated pid.
It Fl R
Display relative timestamps (time since previous entry).
It Fl T
Display absolute timestamps for each entry (seconds since epoch).
It 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 .
It Fl x
Display GIO data in hex and ascii instead of
Xr vis 3
format.
It 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
Bx 4.4 .
