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pmgetversion(3) — Linux manual page

NAME | C SYNOPSIS | DESCRIPTION | EXAMPLE | SEE ALSO | COLOPHON 

PMGETVERSION(3)          Library Functions Manual         PMGETVERSION(3)

NAME         top

       pmGetVersion - fetch installed PCP version number

C SYNOPSIS         top

       #include <pcp/pmapi.h>

       int pmGetVersion(void);

       cc ... -lpcp

DESCRIPTION         top

       pmGetVersion  returns  a  binary encoding of the locally installed
       PCP version number.

       This  may  be  used  in  conjunction  with  the   related   macros
       PM_VERSION(a,b,c) and PM_VERSION_CURRENT that generate PCP version
       numbers in the same format.  Refer to the example below.

       The  encoding  uses  one byte for each of the parts of the version
       number of the installed PCP package, namely the major number,  the
       minor  number  and  the revision number.  So PCP version 3.10.5 is
       encoded as 0x30a05.

       The string format of the installed PCP package version  number  as
       also available from pmGetConfig with the argument PCP_VERSION.

       pmGetVersion was introduced in PCP 3.10.5.

EXAMPLE         top

       The following C fragment demonstrates the use of both the compile-
       time   macros  and  the  run-time  pmGetVersion  function  for  an
       application that should not be built for PCP versions  older  than
       3.10.5,  but  after that there are two alternative implementations
       with a newer (faster, sweeter, smaller) variant of the XYZ service
       that only becoming available in PCP 4.0.0.

       #include <pcp/pmapi.h>

       #ifdef PM_VERSION_CURRENT
       #if PM_VERSION_CURRENT < PM_VERSION(3,10,5)
           /* no pmGetVersion() before PCP 3.10.5 */
           printf("PCP version 0x%x too old\n", PM_VERSION_CURRENT);
       #endif
           version = pmGetVersion();
           if (version >= PM_VERSION(4,0,0) {
            /* V2 of the XYZ service introduced in PCP 4.0.0 */
            printf("Using V2 of service XYZ\n")
            ...
           }
           else {
            printf("Using V1 of service XYZ\n")
            ...
           }
       #else
           {
            char *ver = pmGetConfig("PCP_VERSION");
            /* only option is to extract version number from returned string */
            ...
           }
       #endif

SEE ALSO         top

       PMAPI(3), and pmGetConfig(3).

COLOPHON         top

       This page is part  of  the  PCP  (Performance  Co-Pilot)  project.
       Information    about    the   project   can   be   found   at   
       ⟨http://www.pcp.io/⟩.  If you have a bug  report  for  this  manual
       page,  send  it to pcp@groups.io.  This page was obtained from the
       project's            upstream            Git            repository
       ⟨https://github.com/performancecopilot/pcp.git⟩   on   2025-08-11.
       (At that time, the date of the most recent commit that  was  found
       in  the repository was 2025-08-11.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there is
       a better or more up-to-date source  for  the  page,  or  you  have
       corrections  or  improvements  to the information in this COLOPHON
       (which is not part of the original manual page), send  a  mail  to
       man-pages@man7.org

Performance Co-Pilot               PCP                    PMGETVERSION(3)

Pages that refer to this page: pmgetconfig(3)

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