PMPARSETIMEWINDOW(3)      Library Functions Manual      PMPARSETIMEWINDOW(3)

NAME         top

       pmParseTimeWindow - parse time window command line arguments

C SYNOPSIS         top

       #include <pcp/pmapi.h>

       int pmParseTimeWindow(const char *swStart, const char *swEnd,
               const char *swAlign, const char *swOffset,
               const struct timeval *logStart, const struct timeval *logEnd,
               struct timeval *rsltStart, struct timeval *rsltEnd,
               struct timeval *rsltOffset, char **errMsg);

       cc ... -lpcp

DESCRIPTION         top

       pmParseTimeWindow is designed to encapsulate the interpretation of
       the -S, -T, -A and -O command line options used by Performance Co-
       Pilot (PCP) applications to define a time window of interest.  The
       time window is defined by a start time and an end time that
       constrains the time interval during which the PCP application will
       retrieve and display performance metrics.  In the absence of the -O
       and -A options to specify an initial sample time origin and time
       alignment (see below), the PCP application will retrieve the first
       sample at the start of the time window.

       The syntax and meaning of the various argument formats for these
       options is described in PCPIntro(1).

USAGE         top

       pmParseTimeWindow expects to be called with the argument of the -S
       option as swStart, the argument of the -T option as swEnd, the
       argument of the -A option as swAlign, and the argument of the -O
       option as swOffset.  Any or all of these parameters may be NULL to
       indicate that the corresponding command line option was not present.

       If the application is using a set of PCP archive logs as the source
       of performance metrics, you also need to supply the time of the first
       archive log entry as logStart, and the time of the last archive log
       entry as logEnd.  See pmGetArchiveLabel(3) and pmGetArchiveEnd(3) for
       how to obtain values for these times.

       If the application is manipulating multiple concurrent archive logs,
       then the caller must resolve how the default time window is to be
       defined (the union of the time intervals in all archive logs is a
       likely interpretation).

       If the application is using a live feed of performance data, logStart
       should be the current time (but could be aligned on the next second
       for example), while logEnd should have its tv_sec component set to

       The rsltStart, rsltEnd and rsltOffset structures must be allocated
       before calling pmParseTimeWindow.

       You also need to set the current PCP reporting time zone to correctly
       reflect the -z and -Z command line parameters before calling
       pmParseTimeWindow.  See pmUseZone(3) and friends for information on
       how this is done.

SEE ALSO         top

       PMAPI(3), pmGetArchiveEnd(3), pmGetArchiveLabel(3),
       pmNewContextZone(3), pmNewZone(3), pmParseInterval(3) and

DIAGNOSTICS         top

       If the conversion is successful, pmParseTimeWindow returns 1 and
       fills in rsltStart, rsltEnd and rsltOffset with the start, end, and
       offset times for the time window defined by the input parameters.
       The errMsg parameter is not changed when pmParseTimeWindow returns 1.

       If the conversion is successful, but the requested alignment could
       not be performed (e.g. the set of PCP archive logs is too short) the
       alignment is ignored, rsltStart, rsltEnd and rsltOffset are filled in
       and pmParseTimeWindow returns 0.  In this case, errMsg will point to
       a warning message in an internal static buffer.  This buffer should
       not be freed.

       If the argument strings could not be parsed, pmParseTimeWindow
       returns -1.  In this case, errMsg will point to an error message in a
       static internal buffer.

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at ⟨⟩.
       If you have a bug report for this manual page, send it to  This page was obtained from the project's upstream
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Performance Co-Pilot                 PCP                PMPARSETIMEWINDOW(3)