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/* nspoll.c
*
* This is an io waiter interface utilizing the much-more-efficient poll/epoll API.
* Note that it may not always be available for a given driver. If so, that is reported
* back to the upper peer which then should consult a nssel-based io waiter.
*
* Work on this module begun 2009-11-18 by Rainer Gerhards.
*
* Copyright 2009-2014 Rainer Gerhards and Adiscon GmbH.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* -or-
* see COPYING.ASL20 in the source distribution
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "config.h"
#include "rsyslog.h"
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include "rsyslog.h"
#include "obj.h"
#include "module-template.h"
#include "netstrm.h"
#include "nspoll.h"
#include "rsconf.h"
/* static data */
DEFobjStaticHelpers
DEFobjCurrIf(glbl)
/* load our low-level driver. This must be done before any
* driver-specific functions (allmost all...) can be carried
* out. Note that the driver's .ifIsLoaded is correctly
* initialized by calloc() and we depend on that. Please note that
* we do some name-mangeling. We know that each nsd driver also needs
* a nspoll driver. So we simply append "sel" to the nsd driver name: This,
* of course, means that the driver name must match these rules, but that
* shouldn't be a real problem.
* WARNING: this code is mostly identical to similar code in
* netstrms.c - TODO: abstract it and move it to some common place.
* rgerhards, 2008-04-28
*/
static rsRetVal
loadDrvr(nspoll_t *pThis)
{
DEFiRet;
uchar *pBaseDrvrName;
uchar szDrvrName[48]; /* 48 shall be large enough */
pBaseDrvrName = pThis->pBaseDrvrName;
if(pBaseDrvrName == NULL) /* if no drvr name is set, use system default */
pBaseDrvrName = glbl.GetDfltNetstrmDrvr(runConf);
if(snprintf((char*)szDrvrName, sizeof(szDrvrName), "lmnsdpoll_%s", pBaseDrvrName) == sizeof(szDrvrName))
ABORT_FINALIZE(RS_RET_DRVRNAME_TOO_LONG);
CHKmalloc(pThis->pDrvrName = (uchar*) strdup((char*)szDrvrName));
pThis->Drvr.ifVersion = nsdCURR_IF_VERSION;
/* The pDrvrName+2 below is a hack to obtain the object name. It
* safes us to have yet another variable with the name without "lm" in
* front of it. If we change the module load interface, we may re-think
* about this hack, but for the time being it is efficient and clean
* enough. -- rgerhards, 2008-04-18
*/
CHKiRet(obj.UseObj(__FILE__, szDrvrName+2, DONT_LOAD_LIB, (void*) &pThis->Drvr));
finalize_it:
if(iRet != RS_RET_OK) {
if(pThis->pDrvrName != NULL) {
free(pThis->pDrvrName);
pThis->pDrvrName = NULL;
}
}
RETiRet;
}
/* Standard-Constructor */
BEGINobjConstruct(nspoll) /* be sure to specify the object type also in END macro! */
ENDobjConstruct(nspoll)
/* destructor for the nspoll object */
BEGINobjDestruct(nspoll) /* be sure to specify the object type also in END and CODESTART macros! */
CODESTARTobjDestruct(nspoll)
if(pThis->pDrvrData != NULL)
pThis->Drvr.Destruct(&pThis->pDrvrData);
/* and now we must release our driver, if we got one. We use the presence of
* a driver name string as load indicator (because we also need that string
* to release the driver
*/
free(pThis->pBaseDrvrName);
if(pThis->pDrvrName != NULL) {
obj.ReleaseObj(__FILE__, pThis->pDrvrName+2, DONT_LOAD_LIB, (void*) &pThis->Drvr);
free(pThis->pDrvrName);
}
ENDobjDestruct(nspoll)
/* ConstructionFinalizer */
static rsRetVal
ConstructFinalize(nspoll_t *pThis)
{
DEFiRet;
ISOBJ_TYPE_assert(pThis, nspoll);
CHKiRet(loadDrvr(pThis));
CHKiRet(pThis->Drvr.Construct(&pThis->pDrvrData));
finalize_it:
RETiRet;
}
/* Carries out the actual wait (all done in lower layers)
*/
static rsRetVal
Wait(nspoll_t *pThis, int timeout, int *numEntries, nsd_epworkset_t workset[]) {
DEFiRet;
ISOBJ_TYPE_assert(pThis, nspoll);
assert(workset != NULL);
iRet = pThis->Drvr.Wait(pThis->pDrvrData, timeout, numEntries, workset);
RETiRet;
}
/* set the base driver name. If the driver name
* is set to NULL, the previously set name is deleted but
* no name set again (which results in the system default being
* used)-- rgerhards, 2008-05-05
*/
static rsRetVal
SetDrvrName(nspoll_t *pThis, uchar *pszName)
{
DEFiRet;
ISOBJ_TYPE_assert(pThis, nspoll);
if(pThis->pBaseDrvrName != NULL) {
free(pThis->pBaseDrvrName);
pThis->pBaseDrvrName = NULL;
}
if(pszName != NULL) {
CHKmalloc(pThis->pBaseDrvrName = (uchar*) strdup((char*) pszName));
}
finalize_it:
RETiRet;
}
/* semantics like the epoll_ctl() function, does the same thing.
* rgerhards, 2009-11-18
*/
static rsRetVal
Ctl(nspoll_t *pThis, netstrm_t *pStrm, int id, void *pUsr, int mode, int op) {
DEFiRet;
ISOBJ_TYPE_assert(pThis, nspoll);
iRet = pThis->Drvr.Ctl(pThis->pDrvrData, pStrm->pDrvrData, id, pUsr, mode, op);
RETiRet;
}
/* queryInterface function */
BEGINobjQueryInterface(nspoll)
CODESTARTobjQueryInterface(nspoll)
if(pIf->ifVersion != nspollCURR_IF_VERSION) {/* check for current version, increment on each change */
ABORT_FINALIZE(RS_RET_INTERFACE_NOT_SUPPORTED);
}
/* ok, we have the right interface, so let's fill it
* Please note that we may also do some backwards-compatibility
* work here (if we can support an older interface version - that,
* of course, also affects the "if" above).
*/
pIf->Construct = nspollConstruct;
pIf->ConstructFinalize = ConstructFinalize;
pIf->SetDrvrName = SetDrvrName;
pIf->Destruct = nspollDestruct;
pIf->Wait = Wait;
pIf->Ctl = Ctl;
finalize_it:
ENDobjQueryInterface(nspoll)
/* exit our class
*/
BEGINObjClassExit(nspoll, OBJ_IS_LOADABLE_MODULE) /* CHANGE class also in END MACRO! */
CODESTARTObjClassExit(nspoll)
/* release objects we no longer need */
objRelease(glbl, CORE_COMPONENT);
ENDObjClassExit(nspoll)
/* Initialize the nspoll class. Must be called as the very first method
* before anything else is called inside this class.
* rgerhards, 2008-02-19
*/
BEGINObjClassInit(nspoll, 1, OBJ_IS_CORE_MODULE) /* class, version */
/* request objects we use */
DBGPRINTF("doing nspollClassInit\n");
CHKiRet(objUse(glbl, CORE_COMPONENT));
/* set our own handlers */
ENDObjClassInit(nspoll)
/* vi:set ai:
*/
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