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.\" $OpenBSD: dt.4,v 1.5 2020/05/18 07:03:44 jmc Exp $
.\"
.\" Copyright (c) 2019 Martin Pieuchot <mpi@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: May 18 2020 $
.Dt DT 4
.Os
.Sh NAME
.Nm dt
.Nd dynamic tracer
.Sh SYNOPSIS
.Cd "pseudo-device dt"
.Sh DESCRIPTION
System and application tracing can happen in the kernel.
It has to be configured and enabled through the
.Xr ioctl 2
interface exposed by the pseudo-device
.Pa /dev/dt .
.Pp
This device can only be opened when the
.Va kern.allowdt
.Xr sysctl 2
variable is set.
.\"Sh IOCTL INTERFACE
.\"
.Sh FILES
.Bl -tag -width /dev/dt -compact
.It Pa /dev/dt
dynamic tracing device.
.El
.Sh SEE ALSO
.Xr ioctl 2
.\".Xr bt 5 ,
.\".Xr btrace 8
.Sh HISTORY
The
.Nm
dynamic tracing mechanism first appeared in
.Ox 6.7 .
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