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+.\" Copyright (c) 1983 The Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\" must display the following acknowledgement:
+.\" This product includes software developed by the University of
+.\" California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\" may be used to endorse or promote products derived from this software
+.\" without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" @(#)ktrace.2 1.0 (Berkeley) 1/4/94
+.\"
+.Dd Jan 4, 1994
+.Dt KTRACE 2
+.Os BSD 4.3
+.Sh NAME
+.Nm ktrace
+.Nd kernel call trace
+.Sh SYNOPSIS
+.Fd #include <sys/ktrace.h>
+.Ft int
+.Fn ktrace "const char *file" "int op" "int flag" "pid_t pid"
+.Sh DESCRIPTION
+.Fn Ktrace
+enables kernel trace logging for the specified processes.
+Kernel trace data is logged to the file
+.Pa file .
+The kernel operations that are traced include system calls, namei
+translations, signal processing, and
+.Tn I/O .
+
+needs to be written.
+.Sh RETURN VALUES
+needs to be written.
+.Sh ERRORS
+.Fn Ktrace
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EACCESS
+.It Bq Er EPERM
+.It Bq Er EINVAL
+.It Bq Er ESRCH
+The pid doesn't exist.
+.Sh SEE ALSO
+.Xr ktrace 1