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PMC_ATTACH(3)	       FreeBSD Library Functions Manual		 PMC_ATTACH(3)

NAME
     pmc_attach, pmc_detach -- attaching and detaching process scope PMCs to
     target processes

LIBRARY
     Performance Monitoring Counters Interface Library (libpmc,	-lpmc)

SYNOPSIS
     #include <pmc.h>

     int
     pmc_attach(pmc_id_t pmcid,	pid_t pid);

     int
     pmc_detach(pmc_id_t pmcid,	pid_t pid);

DESCRIPTION
     These functions control the set of	target processes tracked by a process
     scope PMC.

     Function pmc_attach() is used to attach a process scope PMC specified by
     argument pmcid to a target	process	specified by argument pid.  Argument
     pid may be	zero to	denote the current process.  If	the PMC	was allocated
     with modifier PMC_F_DESCENDANTS, the PMC will additionally	attach to cur-
     rent and future descendents of the	specified target process.  The PMC
     should be in a quiescent state (i.e., not running).

     Function pmc_detach() is used to detach a process scope PMC specified by
     argument pmcid from a process specified by	argument pid.  Argument	pid
     may be zero to denote the current process.

RETURN VALUES
     Upon successful completion, the value 0 is	returned; otherwise the
     value -1 is returned and the global variable errno	is set to indicate the
     error.

ERRORS
     A call to function	pmc_attach() may fail with the following errors:

     [EBUSY]		Argument pmcid specified a PMC that was	not in a qui-
			escent state.

     [EBUSY]		The target process specified by	function pmc_attach is
			being tracked by another process scope PMC that	uses
			the same PMC hardware resources.

     [EEXIST]		The target process is already being tracked by the
			specified PMC.

     [EINVAL]		Argument pmcid specified a PMC with system scope.

     [EINVAL]		Argument pid specified an illegal process id.

     [EINVAL]		The current process does not own a PMC with the	handle
			specified in argument pmcid.

     [EPERM]		The caller lacked the privilege	needed to attach PMCs
			to the specified target	process.

     [EPERM]		(i386 and amd64	architectures) The PMC specified by
			argument pmcid has been	setup to allow the use of the
			RDPMC instruction for self measurement.

     [ESRCH]		The current process does not own any PMCs.

     [ESRCH]		The process specified by argument pid did not exist.

     A call to function	pmc_detach() may fail with the following errors:

     [EINVAL]		Argument pmcid specified a PMC with system scope.

     [EINVAL]		Argument pid specified an illegal process id.

     [EINVAL]		The current process does not own a PMC with the	handle
			specified in argument pmcid.

     [EINVAL]		The specified PMC was not attached to the target
			process.

     [ESRCH]		The current process does not own any PMCs.

     [ESRCH]		The process specified by argument pid is not being
			monitored by hwpmc(4).

     [ESRCH]		The process specified by argument pid did not exist.

SEE ALSO
     pmc(3), pmc_start(3), pmc_stop(3),	hwpmc(4)

FreeBSD	13.0		       November	25, 2007		  FreeBSD 13.0
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO

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