pmc_start man page on FreeBSD

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PMC_START(3)		 BSD Library Functions Manual		  PMC_START(3)

NAME
     pmc_start, pmc_stop — start and stop a PMC

LIBRARY
     Performance Counters Library (libpmc, -lpmc)

SYNOPSIS
     #include <pmc.h>

     int
     pmc_start(pmc_id_t pmc);

     int
     pmc_stop(pmc_id_t pmc);

DESCRIPTION
     These functions are used to start and stop a PMC.

     Function pmc_start() starts the PMC specified by argument pmc.  If the
     specified PMC has process scope and has not been attached to any targets,
     it will be attached to the current process.

     Function pmc_stop() stops the PMC specified by argument pmc.

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 these functions may fail with the following errors:

     [EDOOFUS]		Function pmc_start() specified a PMC that requires a
			log file and no log file was configured.

     [EINVAL]		The specified PMC is in the process of being deleted.

     [EINVAL]		Function pmc_stop() specified a PMC that was never
			started.

     [ENXIO]		The specified PMC had system scope and its associated
			CPU was disabled or absent.

SEE ALSO
     pmc(3), hwpmc(4)

BSD			      September 22, 2008			   BSD
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