pmgetversion(3)

NAME

   pmGetVersion - fetch installed PCP version number

C SYNOPSIS

   #include <pcp/pmapi.h>

   int pmGetVersion(void);

   cc ... -lpcp

DESCRIPTION

   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

   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

   PMAPI(3), and pmGetConfig(3).

DIAGNOSTICS

   None.

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