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.\" $FreeBSD: release/9.1.0/cddl/usr.sbin/dtruss/dtruss.1 211841 2010-08-26 11:45:39Z rpaulo $
.\"
.Dd August 26, 2010
.Dt DTRUSS 1
.Os
.Sh NAME
.Nm dtruss 
.Nd Trace system calls and userland stacks using DTrace
.Sh SYNOPSIS
.Nm
.Op Fl acdefholLs
.Op Fl t Ar syscall
.Op Fl n Ar name Fl p Ar pid Ar command
.Sh DESCRIPTION
The
.Nm
utility traces system calls and (optionally) userland stack traces for the
specified programs.
.Pp
The following options are available:
.Bl -tag -width indent
.It Fl p Ar pid
Trace the process with PID
.Ar pid .
.It Fl n Ar name
Trace the process with name
.Ar name .
.It Fl t Ar syscall
Trace the specified syscall only.
.It Fl a
Print all details.
.It Fl c
Print syscall counts.
.It Fl d
Print relative times (in microseconds).
.It Fl e
Print elapsed times (in microseconds).
.It Fl f
Follow the children processes.
.It Fl l
Force printing PID / TID.
.It Fl o
Print time spent on CPU.
.It Fl s
Print userland stack backtraces.
.It Fl L
Don't print PID / TID.
.It Fl b Ar bufsize
Specify the DTrace buffer size.
.El
.Sh EXIT STATUS
.Ex -std
.Sh SEE ALSO
.Xr dtrace 1 
.Sh HISTORY
The
.Nm
utility comes from the DTraceToolkit and was first imported into
.Fx 9.0 .
.Sh AUTHORS
.An Brendan Gregg