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-.\" Copyright (c) 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" Donn Seeley of BSDI.
-.\"
-.\" 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. 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.
-.\"
-.\"	@(#)profil.2	8.1 (Berkeley) 6/4/93
-.\" $FreeBSD$
-.\"
-.Dd December 1, 2017
-.Dt PROFIL 2
-.Os
-.Sh NAME
-.Nm profil
-.Nd control process profiling
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In unistd.h
-.Ft int
-.Fn profil "char *samples" "size_t size" "vm_offset_t offset" "int scale"
-.Sh DESCRIPTION
-The
-.Fn profil
-system call enables or disables
-program counter profiling of the current process.
-If profiling is enabled,
-then at every profiling clock tick,
-the kernel updates an appropriate count in the
-.Fa samples
-buffer.
-The frequency of the profiling clock is recorded
-in the header in the profiling output file.
-.Pp
-The buffer
-.Fa samples
-contains
-.Fa size
-bytes and is divided into
-a series of 16-bit bins.
-Each bin counts the number of times the program counter
-was in a particular address range in the process
-when a profiling clock tick occurred while profiling was enabled.
-For a given program counter address,
-the number of the corresponding bin is given
-by the relation:
-.Bd -literal -offset indent
-[(pc - offset) / 2] * scale / 65536
-.Ed
-.Pp
-The
-.Fa offset
-argument is the lowest address at which
-the kernel takes program counter samples.
-The
-.Fa scale
-argument ranges from 1 to 65536 and
-can be used to change the span of the bins.
-A scale of 65536 maps each bin to 2 bytes of address range;
-a scale of 32768 gives 4 bytes, 16384 gives 8 bytes and so on.
-Intermediate values provide approximate intermediate ranges.
-A
-.Fa scale
-value of 0 disables profiling.
-.Sh RETURN VALUES
-.Rv -std profil
-.Sh FILES
-.Bl -tag -width /usr/lib/gcrt0.o -compact
-.It Pa /usr/lib/gcrt0.o
-profiling C run-time startup file
-.It Pa gmon.out
-conventional name for profiling output file
-.El
-.Sh ERRORS
-The following error may be reported:
-.Bl -tag -width Er
-.It Bq Er EFAULT
-The buffer
-.Fa samples
-contains an invalid address.
-.El
-.Sh SEE ALSO
-.Xr gprof 1
-.Sh HISTORY
-The
-.Fn profil
-function appeared in
-.At v6 .
-.Sh BUGS
-This routine should be named
-.Fn profile .
-.Pp
-The
-.Fa samples
-argument should really be a vector of type
-.Fa "unsigned short" .
-.Pp
-The format of the gmon.out file is undocumented.