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pmgetarchiveend(3)

NAME

   pmGetArchiveEnd - locate logical end of file for a set of archive logs

C SYNOPSIS

   #include <pcp/pmapi.h>

   int pmGetArchiveEnd(struct timeval *tvp);

   cc ... -lpcp

DESCRIPTION

   Assuming  the current PMAPI context is associated with a set of archive
   logs, pmGetArchiveEnd will attempt to find  the  logical  end  of  file
   (after the last complete record in the set of archives), and return the
   last recorded timestamp via tvp.   This  timestamp  may  be  passed  to
   pmSetMode(3)  to  reliably  position  the context at the last valid log
   record,  e.g.  in  preparation  for  subsequent  reading   in   reverse
   chronological order.

   For  archive logs that are not concurrently being written, the physical
   end of file and the logical end of file are co-incident.  However if an
   archive  log  is  being  written  by  pmlogger(1)  at  the same time an
   application is trying to read the archive, the logical end of file  may
   be  before  the physical end of file due to write buffering that is not
   aligned with the logical record boundaries.

   pmGetArchiveEnd returns an error less  than  zero  if  the  context  is
   neither  valid,  nor  associated  with a set of archives, or the set of
   archives is seriously corrupted.  Otherwise, the return value is  0  if
   there  has  been  no  change  of state since the last call, or 1 if the
   logical end of file has advanced since the last call.

   In the absence of an error,  the  result  returned  via  tvp  is  well-
   defined.

   pmGetArchiveEnd  preserves  the positioning state of the log file prior
   to this function call.

PCP ENVIRONMENT

   Environment variables with the prefix PCP_ are used to parameterize the
   file  and  directory names used by PCP.  On each installation, the file
   /etc/pcp.conf contains the  local  values  for  these  variables.   The
   $PCP_CONF  variable may be used to specify an alternative configuration
   file, as described in pcp.conf(5).  Values for these variables  may  be
   obtained programmatically using the pmGetConfig(3) function.

SEE ALSO

   PMAPI(3),    pmFetch(3),    pmFetchArchive(3),    pmGetArchiveLabel(3),
   pmGetConfig(3), pmSetMode(3), pcp.conf(5) and pcp.env(5).

DIAGNOSTICS

   PM_ERR_NOCONTEXT
          the current PMAPI context is either invalid, or  not  associated
          with an set of archive logs

   PM_ERR_LOGREC
          the  set  of archives is sufficiently damaged, that not a single
          valid record can be found



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