1.\"	$OpenBSD: kdump.1,v 1.12 2003/09/03 12:12:47 jmc Exp $
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30.\"	from: @(#)kdump.1	8.1 (Berkeley) 6/6/93
31.\"
32.Dd June 6, 1993
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 dnlRT
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 l
73Loop reading the trace file, once the end-of-file is reached, waiting for
74more data.
75.It Fl m Ar maxdata
76Display at most
77.Ar maxdata
78bytes when decoding I/O.
79.It Fl n
80Suppress ad hoc translations.
81Normally
82.Nm
83tries to decode many system calls into a more human-readable format.
84For example,
85.Xr ioctl 2
86values are replaced with the macro name and
87.Va errno
88values are replaced with the
89.Xr strerror 3
90string.
91Suppressing this feature yields a more consistent output format and is
92easily amenable to further processing.
93.It Fl p Ar pid
94Show output only for the
95.Ar pid
96specified.
97.It Fl R
98Display relative timestamps (time since previous entry).
99.It Fl T
100Display absolute timestamps for each entry (seconds since epoch).
101.It Fl t Op ceinsw
102Selects which tracepoints to display. See the
103.Fl t
104option of
105.Xr ktrace 1
106for the definitions of the flags.
107.El
108.Sh FILES
109.Bl -tag -width ktrace.out -compact
110.It Pa ktrace.out
111default ktrace dump file
112.El
113.Sh SEE ALSO
114.Xr ktrace 1
115.Sh HISTORY
116The
117.Nm
118command appeared in
119.Bx 4.4 .
120