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/* nsdsel_ptcp.c
*
* An implementation of the nsd select() interface for plain tcp sockets.
*
* 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 <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <sys/select.h>
#include "rsyslog.h"
#include "module-template.h"
#include "obj.h"
#include "errmsg.h"
#include "nsd_ptcp.h"
#include "nsdsel_ptcp.h"
#include "unlimited_select.h"
/* static data */
DEFobjStaticHelpers
DEFobjCurrIf(errmsg)
DEFobjCurrIf(glbl)
/* Standard-Constructor
*/
BEGINobjConstruct(nsdsel_ptcp) /* be sure to specify the object type also in END macro! */
pThis->maxfds = 0;
#ifdef USE_UNLIMITED_SELECT
pThis->pReadfds = calloc(1, glbl.GetFdSetSize());
pThis->pWritefds = calloc(1, glbl.GetFdSetSize());
#else
FD_ZERO(&pThis->readfds);
FD_ZERO(&pThis->writefds);
#endif
ENDobjConstruct(nsdsel_ptcp)
/* destructor for the nsdsel_ptcp object */
BEGINobjDestruct(nsdsel_ptcp) /* be sure to specify the object type also in END and CODESTART macros! */
CODESTARTobjDestruct(nsdsel_ptcp)
#ifdef USE_UNLIMITED_SELECT
freeFdSet(pThis->pReadfds);
freeFdSet(pThis->pWritefds);
#endif
ENDobjDestruct(nsdsel_ptcp)
/* Add a socket to the select set */
static rsRetVal
Add(nsdsel_t *pNsdsel, nsd_t *pNsd, nsdsel_waitOp_t waitOp)
{
DEFiRet;
nsdsel_ptcp_t *pThis = (nsdsel_ptcp_t*) pNsdsel;
nsd_ptcp_t *pSock = (nsd_ptcp_t*) pNsd;
#ifdef USE_UNLIMITED_SELECT
fd_set *pReadfds = pThis->pReadfds;
fd_set *pWritefds = pThis->pWritefds;
#else
fd_set *pReadfds = &pThis->readfds;
fd_set *pWritefds = &pThis->writefds;
#endif
ISOBJ_TYPE_assert(pSock, nsd_ptcp);
ISOBJ_TYPE_assert(pThis, nsdsel_ptcp);
switch(waitOp) {
case NSDSEL_RD:
FD_SET(pSock->sock, pReadfds);
break;
case NSDSEL_WR:
FD_SET(pSock->sock, pWritefds);
break;
case NSDSEL_RDWR:
FD_SET(pSock->sock, pReadfds);
FD_SET(pSock->sock, pWritefds);
break;
}
if(pSock->sock > pThis->maxfds)
pThis->maxfds = pSock->sock;
RETiRet;
}
/* perform the select() piNumReady returns how many descriptors are ready for IO
* TODO: add timeout!
*/
static rsRetVal
Select(nsdsel_t *pNsdsel, int *piNumReady)
{
DEFiRet;
int i;
nsdsel_ptcp_t *pThis = (nsdsel_ptcp_t*) pNsdsel;
#ifdef USE_UNLIMITED_SELECT
fd_set *pReadfds = pThis->pReadfds;
fd_set *pWritefds = pThis->pWritefds;
#else
fd_set *pReadfds = &pThis->readfds;
fd_set *pWritefds = &pThis->writefds;
#endif
ISOBJ_TYPE_assert(pThis, nsdsel_ptcp);
assert(piNumReady != NULL);
if(Debug) { // TODO: debug setting!
// TODO: name in dbgprintf!
dbgprintf("--------<NSDSEL_PTCP> calling select, active fds (max %d): ", pThis->maxfds);
for(i = 0; i <= pThis->maxfds; ++i)
if(FD_ISSET(i, pReadfds) || FD_ISSET(i, pWritefds))
dbgprintf("%d ", i);
dbgprintf("\n");
}
/* now do the select */
*piNumReady = select(pThis->maxfds+1, pReadfds, pWritefds, NULL, NULL);
RETiRet;
}
/* check if a socket is ready for IO */
static rsRetVal
IsReady(nsdsel_t *pNsdsel, nsd_t *pNsd, nsdsel_waitOp_t waitOp, int *pbIsReady)
{
DEFiRet;
nsdsel_ptcp_t *pThis = (nsdsel_ptcp_t*) pNsdsel;
nsd_ptcp_t *pSock = (nsd_ptcp_t*) pNsd;
#ifdef USE_UNLIMITED_SELECT
fd_set *pReadfds = pThis->pReadfds;
fd_set *pWritefds = pThis->pWritefds;
#else
fd_set *pReadfds = &pThis->readfds;
fd_set *pWritefds = &pThis->writefds;
#endif
ISOBJ_TYPE_assert(pThis, nsdsel_ptcp);
ISOBJ_TYPE_assert(pSock, nsd_ptcp);
assert(pbIsReady != NULL);
switch(waitOp) {
case NSDSEL_RD:
*pbIsReady = FD_ISSET(pSock->sock, pReadfds);
break;
case NSDSEL_WR:
*pbIsReady = FD_ISSET(pSock->sock, pWritefds);
break;
case NSDSEL_RDWR:
*pbIsReady = FD_ISSET(pSock->sock, pReadfds)
| FD_ISSET(pSock->sock, pWritefds);
break;
}
RETiRet;
}
/* ------------------------------ end support for the select() interface ------------------------------ */
/* queryInterface function */
BEGINobjQueryInterface(nsdsel_ptcp)
CODESTARTobjQueryInterface(nsdsel_ptcp)
if(pIf->ifVersion != nsdCURR_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 = (rsRetVal(*)(nsdsel_t**)) nsdsel_ptcpConstruct;
pIf->Destruct = (rsRetVal(*)(nsdsel_t**)) nsdsel_ptcpDestruct;
pIf->Add = Add;
pIf->Select = Select;
pIf->IsReady = IsReady;
finalize_it:
ENDobjQueryInterface(nsdsel_ptcp)
/* exit our class
*/
BEGINObjClassExit(nsdsel_ptcp, OBJ_IS_CORE_MODULE) /* CHANGE class also in END MACRO! */
CODESTARTObjClassExit(nsdsel_ptcp)
/* release objects we no longer need */
objRelease(glbl, CORE_COMPONENT);
objRelease(errmsg, CORE_COMPONENT);
ENDObjClassExit(nsdsel_ptcp)
/* Initialize the nsdsel_ptcp class. Must be called as the very first method
* before anything else is called inside this class.
* rgerhards, 2008-02-19
*/
BEGINObjClassInit(nsdsel_ptcp, 1, OBJ_IS_CORE_MODULE) /* class, version */
/* request objects we use */
CHKiRet(objUse(errmsg, CORE_COMPONENT));
CHKiRet(objUse(glbl, CORE_COMPONENT));
/* set our own handlers */
ENDObjClassInit(nsdsel_ptcp)
/* vi:set ai:
*/
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