freebsd man page for pmc_start

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 tar-
     gets, 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