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NAME | C SYNOPSIS | DESCRIPTION | EXAMPLE | SEE ALSO | COLOPHON |
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PMGETVERSION(3) Library Functions Manual PMGETVERSION(3)
pmGetVersion - fetch installed PCP version number
#include <pcp/pmapi.h>
int pmGetVersion(void);
cc ... -lpcp
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.
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
PMAPI(3), and pmGetConfig(3).
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 [email protected]. This page was obtained from the
project's upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2024-06-14.
(At that time, the date of the most recent commit that was found
in the repository was 2024-06-14.) 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
[email protected]
Performance Co-Pilot PCP PMGETVERSION(3)
Pages that refer to this page: pmgetconfig(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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