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/*
* Trivial, configurable PMDA
*
* Copyright (c) 2014 Red Hat.
* Copyright (c) 1995,2004 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <pcp/pmapi.h>
#include <pcp/impl.h>
#include <pcp/pmda.h>
#include "domain.h"
/*
* Trivial PMDA
*
* This PMDA is a sample that illustrates how a trivial PMDA might be
* constructed using libpcp_pmda.
*
* Although the metrics supported are trivial, the framework is quite general,
* and could be extended to implement a much more complex PMDA.
*
* Metrics
* trivial.time - time in seconds since the 1st of Jan, 1970.
*/
/*
* all metrics supported in this PMDA - one table entry for each
*/
static pmdaMetric metrictab[] = {
/* time */
{ NULL,
{ PMDA_PMID(0,0), PM_TYPE_U32, PM_INDOM_NULL, PM_SEM_COUNTER,
PMDA_PMUNITS(0, 1, 0, 0, PM_TIME_SEC, 0) } }
};
static char *username;
static char mypath[MAXPATHLEN];
static int isDSO = 1; /* ==0 if I am a daemon */
static pmLongOptions longopts[] = {
PMDA_OPTIONS_HEADER("Options"),
PMOPT_DEBUG,
PMDAOPT_DOMAIN,
PMDAOPT_LOGFILE,
PMDAOPT_USERNAME,
PMOPT_HELP,
PMDA_OPTIONS_END
};
static pmdaOptions opts = {
.short_options = "D:d:l:U:?",
.long_options = longopts,
};
/*
* callback provided to pmdaFetch
*/
static int
trivial_fetchCallBack(pmdaMetric *mdesc, unsigned int inst, pmAtomValue *atom)
{
__pmID_int *idp = (__pmID_int *)&(mdesc->m_desc.pmid);
if (idp->cluster != 0 || idp->item != 0)
return PM_ERR_PMID;
else if (inst != PM_IN_NULL)
return PM_ERR_INST;
atom->ul = time(NULL);
return 0;
}
/*
* Initialise the agent (both daemon and DSO).
*/
void
trivial_init(pmdaInterface *dp)
{
if (isDSO) {
int sep = __pmPathSeparator();
snprintf(mypath, sizeof(mypath), "%s%c" "trivial" "%c" "help",
pmGetConfig("PCP_PMDAS_DIR"), sep, sep);
pmdaDSO(dp, PMDA_INTERFACE_2, "trivial DSO", mypath);
} else {
__pmSetProcessIdentity(username);
}
if (dp->status != 0)
return;
pmdaSetFetchCallBack(dp, trivial_fetchCallBack);
pmdaInit(dp, NULL, 0,
metrictab, sizeof(metrictab)/sizeof(metrictab[0]));
}
/*
* Set up the agent if running as a daemon.
*/
int
main(int argc, char **argv)
{
int sep = __pmPathSeparator();
pmdaInterface desc;
isDSO = 0;
__pmSetProgname(argv[0]);
__pmGetUsername(&username);
snprintf(mypath, sizeof(mypath), "%s%c" "trivial" "%c" "help",
pmGetConfig("PCP_PMDAS_DIR"), sep, sep);
pmdaDaemon(&desc, PMDA_INTERFACE_2, pmProgname, TRIVIAL,
"trivial.log", mypath);
pmdaGetOptions(argc, argv, &opts, &desc);
if (opts.errors) {
pmdaUsageMessage(&opts);
exit(1);
}
if (opts.username)
username = opts.username;
pmdaOpenLog(&desc);
trivial_init(&desc);
pmdaConnect(&desc);
pmdaMain(&desc);
exit(0);
}
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