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Man Pages


Manual Reference Pages  -  PMC_ATTACH (3)

NAME

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

CONTENTS

Library
Synopsis
Description
Return Values
Errors
See Also

LIBRARY


.Lb libpmc

SYNOPSIS


.In 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 current 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


.Rv -std

ERRORS

A call to function pmc_attach may fail with the following errors:
[EBUSY]
  Argument pmcid specified a PMC that was not in a quiescent 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)
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