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.\" Copyright (c) 2007 Joseph Koshy. 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.
.\"
.\" This software is provided by Joseph Koshy ``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 Joseph Koshy 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.
.\"
.\" $FreeBSD$
.\"
.Dd November 25, 2007
.Os
.Dt PMC_START 3
.Sh NAME
.Nm pmc_start ,
.Nm pmc_stop
.Nd start and stop a PMC
.Sh LIBRARY
.Lb libpmc
.Sh SYNOPSIS
.In pmc.h
.Ft int
.Fn pmc_start "pmc_id_t pmc"
.Ft int
.Fn pmc_stop "pmc_id_t pmc"
.Sh DESCRIPTION
These functions are used to start and stop a PMC.
.Pp
Function
.Fn pmc_start
starts the PMC specified by argument
.Fa pmc .
If the specified PMC has process scope and has not been attached
to any targets, it will be attached to the current process.
.Pp
Function
.Fn pmc_stop
stops the PMC specified by argument
.Fa pmc .
.Sh RETURN VALUES
.Rv -std
.Sh ERRORS
A call to these functions may fail with the following errors:
.Bl -tag -width Er
.It Bq Er EDOOFUS
Function
.Fn pmc_start
specified a PMC that requires a log file and no log file was
configured.
.It Bq Er EINVAL
The specified PMC is in the process of being deleted.
.It Bq Er EINVAL
Function
.Fn pmc_stop
specified a PMC that was never started.
.It Bq Er ENXIO
The specified PMC had system scope and its associated CPU was disabled.
.El
.Sh SEE ALSO
.Xr pmc 3 ,
.Xr hwpmc 4
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