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+.\" Copyright (c) 1980, 1991, 1992, 1993
+.\"	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.
+.\"
+.\"	@(#)moncontrol.3	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt MONCONTROL 3
+.Os
+.Sh NAME
+.Nm moncontrol ,
+.Nm monstartup
+.Nd control execution profile
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.Ft int
+.Fn moncontrol "int mode"
+.Ft int
+.Fn monstartup "u_long *lowpc" "u_long *highpc"
+.Sh DESCRIPTION
+An executable program compiled using the
+.Fl pg
+option to
+.Xr cc 1
+automatically includes calls to collect statistics for the
+.Xr gprof 1
+call-graph execution profiler.
+In typical operation, profiling begins at program startup
+and ends when the program calls exit.
+When the program exits, the profiling data are written to the file
+.Em progname.gmon ,
+where progname is the name of the program, then
+.Xr gprof 1
+can be used to examine the results.
+.Pp
+.Fn moncontrol
+selectively controls profiling within a program.
+When the program starts, profiling begins.
+To stop the collection of histogram ticks and call counts use
+.Fn moncontrol 0 ;
+to resume the collection of histogram ticks and call counts use
+.Fn moncontrol 1 .
+This feature allows the cost of particular operations to be measured.
+Note that an output file will be produced on program exit
+regardless of the state of
+.Fn moncontrol .
+.Pp
+Programs that are not loaded with
+.Fl pg
+may selectively collect profiling statistics by calling
+.Fn monstartup
+with the range of addresses to be profiled.
+.Fa lowpc
+and
+.Fa highpc
+specify the address range that is to be sampled;
+the lowest address sampled is that of
+.Fa lowpc
+and the highest is just below
+.Fa highpc .
+Only functions in that range that have been compiled with the
+.Fl pg
+option to
+.Xr cc 1
+will appear in the call graph part of the output;
+however, all functions in that address range will
+have their execution time measured.
+Profiling begins on return from
+.Fn monstartup .
+.Sh FILES
+.Bl -tag -width progname.gmon -compact
+.It Pa progname.gmon
+execution data file
+.El
+.Sh SEE ALSO
+.Xr cc 1 ,
+.Xr gprof 1 ,
+.Xr profil 2 ,
+.Xr clocks 7