2007-11-25 06:38:55 +00:00
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.\" Copyright (c) 2007 Joseph Koshy. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" This software is provided by Joseph Koshy ``as is'' and
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.\" any express or implied warranties, including, but not limited to, the
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.\" implied warranties of merchantability and fitness for a particular purpose
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.\" are disclaimed. in no event shall Joseph Koshy be liable
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.\" for any direct, indirect, incidental, special, exemplary, or consequential
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.\" damages (including, but not limited to, procurement of substitute goods
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.\" or services; loss of use, data, or profits; or business interruption)
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.\" however caused and on any theory of liability, whether in contract, strict
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.\" liability, or tort (including negligence or otherwise) arising in any way
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.\" out of the use of this software, even if advised of the possibility of
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.\" such damage.
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.\"
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.\" $FreeBSD$
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.\"
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2009-11-02 12:35:38 +00:00
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.Dd November 25, 2007
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2007-11-25 06:38:55 +00:00
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.Os
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.Dt PMC_ATTACH 3
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.Sh NAME
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.Nm pmc_attach ,
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.Nm pmc_detach
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.Nd attaching and detaching process scope PMCs to target processes
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.Sh LIBRARY
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.Lb libpmc
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.Sh SYNOPSIS
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.In pmc.h
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.Ft int
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.Fn pmc_attach "pmc_id_t pmcid" "pid_t pid"
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.Ft int
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.Fn pmc_detach "pmc_id_t pmcid" "pid_t pid"
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.Sh DESCRIPTION
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These functions control the set of target processes tracked by a
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process scope PMC.
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.Pp
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Function
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.Fn pmc_attach
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is used to attach a process scope PMC specified by argument
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.Fa pmcid
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to a target process specified by argument
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.Fa pid .
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Argument
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.Fa pid
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may be zero to denote the current process.
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If the PMC was allocated with modifier
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.Dv PMC_F_DESCENDANTS ,
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the PMC will additionally attach to current and future descendents of
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the specified target process.
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The PMC should be in a quiescent state (i.e., not running).
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.Pp
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Function
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.Fn pmc_detach
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is used to detach a process scope PMC specified by argument
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.Fa pmcid
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from a process specified by argument
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.Fa pid .
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Argument
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.Fa pid
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may be zero to denote the current process.
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.Sh RETURN VALUES
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.Rv -std
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.Sh ERRORS
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A call to function
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.Fn pmc_attach
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may fail with the following errors:
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.Bl -tag -width Er
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.It Bq Er EBUSY
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Argument
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.Fa pmcid
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specified a PMC that was not in a quiescent state.
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.It Bq Er EBUSY
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The target process specified by function
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.Fa pmc_attach
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is being tracked by another process scope PMC that uses the same PMC
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hardware resources.
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.It Bq Er EEXIST
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The target process is already being tracked by the specified PMC.
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.It Bq Er EINVAL
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Argument
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.Fa pmcid
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specified a PMC with system scope.
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.It Bq Er EINVAL
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Argument
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.Fa pid
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specified an illegal process id.
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.It Bq Er EINVAL
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The current process does not own a PMC with the handle specified in
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argument
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.Fa pmcid .
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.It Bq Er EPERM
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The caller lacked the privilege needed to attach PMCs to
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the specified target process.
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.It Bq Er EPERM
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(i386 and amd64 architectures) The PMC specified by argument
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.Fa pmcid
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has been setup to allow the use of the RDPMC instruction for
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self measurement.
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.It Bq Er ESRCH
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The current process does not own any PMCs.
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.It Bq Er ESRCH
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The process specified by argument
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.Fa pid
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did not exist.
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.El
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.Pp
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A call to function
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.Fn pmc_detach
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may fail with the following errors:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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Argument
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.Fa pmcid
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specified a PMC with system scope.
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.It Bq Er EINVAL
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Argument
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.Fa pid
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specified an illegal process id.
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.It Bq Er EINVAL
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The current process does not own a PMC with the handle specified in
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argument
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.Fa pmcid .
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.It Bq Er EINVAL
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The specified PMC was not attached to the target process.
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.It Bq Er ESRCH
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The current process does not own any PMCs.
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.It Bq Er ESRCH
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The process specified by argument
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.Fa pid
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is not being monitored by
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.Xr hwpmc 4 .
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.It Bq Er ESRCH
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The process specified by argument
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.Fa pid
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did not exist.
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.El
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.Sh SEE ALSO
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.Xr pmc 3 ,
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.Xr pmc_start 3 ,
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.Xr pmc_stop 3 ,
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.Xr hwpmc 4
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