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/* nssel.c
*
* The io waiter is a helper object enabling us to wait on a set of streams to become
* ready for IO - this is modelled after select(). We need this, because
* stream drivers may have different concepts. Consequently,
* the structure must contain nsd_t's from the same stream driver type
* only. This is implemented as a singly-linked list where every
* new element is added at the top of the list.
*
* Work on this module begun 2008-04-22 by Rainer Gerhards.
*
* Copyright 2008 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of the rsyslog runtime library.
*
* The rsyslog runtime library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The rsyslog runtime library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the rsyslog runtime library. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
* A copy of the LGPL can be found in the file "COPYING.LESSER" in this distribution.
*/
#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 "nssel.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 nssel 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(nssel_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();
if(snprintf((char*)szDrvrName, sizeof(szDrvrName), "lmnsdsel_%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(nssel) /* be sure to specify the object type also in END macro! */
ENDobjConstruct(nssel)
/* destructor for the nssel object */
BEGINobjDestruct(nssel) /* be sure to specify the object type also in END and CODESTART macros! */
CODESTARTobjDestruct(nssel)
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
*/
if(pThis->pDrvrName != NULL) {
obj.ReleaseObj(__FILE__, pThis->pDrvrName+2, DONT_LOAD_LIB, (void*) &pThis->Drvr);
free(pThis->pDrvrName);
}
ENDobjDestruct(nssel)
/* ConstructionFinalizer */
static rsRetVal
ConstructFinalize(nssel_t *pThis)
{
DEFiRet;
ISOBJ_TYPE_assert(pThis, nssel);
CHKiRet(loadDrvr(pThis));
CHKiRet(pThis->Drvr.Construct(&pThis->pDrvrData));
finalize_it:
RETiRet;
}
/* Add a stream object to the current select() set.
* Note that a single stream may have multiple "sockets" if
* it is a listener. If so, all of them are begin added.
*/
static rsRetVal
Add(nssel_t *pThis, netstrm_t *pStrm, nsdsel_waitOp_t waitOp)
{
DEFiRet;
ISOBJ_TYPE_assert(pThis, nssel);
ISOBJ_TYPE_assert(pStrm, netstrm);
CHKiRet(pThis->Drvr.Add(pThis->pDrvrData, pStrm->pDrvrData, waitOp));
finalize_it:
RETiRet;
}
/* wait for IO to happen on one of our netstreams. iNumReady has
* the number of ready "sockets" after the call. This function blocks
* until some are ready. EAGAIN is retried.
*/
static rsRetVal
Wait(nssel_t *pThis, int *piNumReady)
{
DEFiRet;
ISOBJ_TYPE_assert(pThis, nssel);
assert(piNumReady != NULL);
iRet = pThis->Drvr.Select(pThis->pDrvrData, piNumReady);
RETiRet;
}
/* Check if a stream is ready for IO. *piNumReady contains the remaining number
* of ready streams. Note that this function may say the stream is not ready
* but still decrement *piNumReady. This can happen when (e.g. with TLS) the low
* level driver requires some IO which is hidden from the upper layer point of view.
* rgerhards, 2008-04-23
*/
static rsRetVal
IsReady(nssel_t *pThis, netstrm_t *pStrm, nsdsel_waitOp_t waitOp, int *pbIsReady, int *piNumReady)
{
DEFiRet;
ISOBJ_TYPE_assert(pThis, nssel);
ISOBJ_TYPE_assert(pStrm, netstrm);
assert(pbIsReady != NULL);
assert(piNumReady != NULL);
iRet = pThis->Drvr.IsReady(pThis->pDrvrData, pStrm->pDrvrData, waitOp, pbIsReady);
RETiRet;
}
/* queryInterface function */
BEGINobjQueryInterface(nssel)
CODESTARTobjQueryInterface(nssel)
if(pIf->ifVersion != nsselCURR_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 = nsselConstruct;
pIf->ConstructFinalize = ConstructFinalize;
pIf->Destruct = nsselDestruct;
pIf->Add = Add;
pIf->Wait = Wait;
pIf->IsReady = IsReady;
finalize_it:
ENDobjQueryInterface(nssel)
/* exit our class
*/
BEGINObjClassExit(nssel, OBJ_IS_LOADABLE_MODULE) /* CHANGE class also in END MACRO! */
CODESTARTObjClassExit(nssel)
/* release objects we no longer need */
objRelease(glbl, CORE_COMPONENT);
ENDObjClassExit(nssel)
/* Initialize the nssel class. Must be called as the very first method
* before anything else is called inside this class.
* rgerhards, 2008-02-19
*/
BEGINObjClassInit(nssel, 1, OBJ_IS_CORE_MODULE) /* class, version */
/* request objects we use */
CHKiRet(objUse(glbl, CORE_COMPONENT));
/* set our own handlers */
ENDObjClassInit(nssel)
/* vi:set ai:
*/
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