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/* modules.h
*
* Definition for build-in and plug-ins module handler. This file is the base
* for all dynamically loadable module support. In theory, in v3 all modules
* are dynamically loaded, in practice we currently do have a few build-in
* once. This may become removed.
*
* The loader keeps track of what is loaded. For library modules, it is also
* used to find objects (libraries) and to obtain the queryInterface function
* for them. A reference count is maintened for libraries, so that they are
* unloaded only when nobody still accesses them.
*
* File begun on 2007-07-22 by RGerhards
*
* Copyright 2007 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of rsyslog.
*
* Rsyslog 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 3 of the License, or
* (at your option) any later version.
*
* Rsyslog 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.
*
* You should have received a copy of the GNU General Public License
* along with Rsyslog. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
*/
#ifndef MODULES_H_INCLUDED
#define MODULES_H_INCLUDED 1
#include "objomsr.h"
#include "threads.h"
/* the following define defines the current version of the module interface.
* It can be used by any module which want's to simply prevent version conflicts
* and does not intend to do specific old-version emulations.
* rgerhards, 2008-03-04
* version 3 adds modInfo_t ptr to call of modInit -- rgerhards, 2008-03-10
*/
#define CURR_MOD_IF_VERSION 3
typedef enum eModType_ {
eMOD_IN, /* input module */
eMOD_OUT, /* output module */
eMOD_LIB /* library module - this module provides one or many interfaces */
} eModType_t;
#ifdef DEBUG
typedef struct modUsr_s {
struct modUsr_s *pNext;
char *pszFile;
} modUsr_t;
#endif
/* how is this module linked? */
typedef enum eModLinkType_ {
eMOD_LINK_STATIC,
eMOD_LINK_DYNAMIC_UNLOADED, /* dynalink module, currently not loaded */
eMOD_LINK_DYNAMIC_LOADED, /* dynalink module, currently loaded */
eMOD_LINK_ALL /* special: all linkage types, e.g. for unload */
} eModLinkType_t;
typedef struct modInfo_s {
struct modInfo_s *pPrev; /* support for creating a double linked module list */
struct modInfo_s *pNext; /* support for creating a linked module list */
int iIFVers; /* Interface version of module */
eModType_t eType; /* type of this module */
eModLinkType_t eLinkType;
uchar* pszName; /* printable module name, e.g. for dbgprintf */
unsigned uRefCnt; /* reference count for this module; 0 -> may be unloaded */
/* functions supported by all types of modules */
rsRetVal (*modInit)(int, int*, rsRetVal(**)()); /* initialize the module */
/* be sure to support version handshake! */
rsRetVal (*modQueryEtryPt)(uchar *name, rsRetVal (**EtryPoint)()); /* query entry point addresses */
rsRetVal (*isCompatibleWithFeature)(syslogFeature);
rsRetVal (*freeInstance)(void*);/* called before termination or module unload */
rsRetVal (*needUDPSocket)(void*);/* called when fd is writeable after select() */
rsRetVal (*dbgPrintInstInfo)(void*);/* called before termination or module unload */
rsRetVal (*tryResume)(void*);/* called to see if module actin can be resumed now */
rsRetVal (*modExit)(void); /* called before termination or module unload */
rsRetVal (*modGetID)(void **); /* get its unique ID from module */
/* below: parse a configuration line - return if processed
* or not. If not, must be parsed to next module.
*/
rsRetVal (*parseConfigLine)(uchar **pConfLine);
/* below: create an instance of this module. Most importantly the module
* can allocate instance memory in this call.
*/
rsRetVal (*createInstance)();
/* TODO: pass pointer to msg submit function to IM rger, 2007-12-14 */
union {
struct {/* data for input modules */
rsRetVal (*runInput)(thrdInfo_t*); /* function to gather input and submit to queue */
rsRetVal (*willRun)(void); /* function to gather input and submit to queue */
rsRetVal (*afterRun)(thrdInfo_t*); /* function to gather input and submit to queue */
} im;
struct {/* data for output modules */
/* below: perform the configured action
*/
rsRetVal (*doAction)(uchar**, unsigned, void*);
rsRetVal (*parseSelectorAct)(uchar**, void**,omodStringRequest_t**);
} om;
struct { /* data for library modules */
} fm;
} mod;
void *pModHdlr; /* handler to the dynamic library holding the module */
# ifdef DEBUG
/* we add some home-grown support to track our users (and detect who does not free us). In
* the long term, this should probably be migrated into debug.c (TODO). -- rgerhards, 2008-03-11
*/
modUsr_t *pModUsrRoot;
# endif
} modInfo_t;
/* interfaces */
BEGINinterface(module) /* name must also be changed in ENDinterface macro! */
modInfo_t *(*GetNxt)(modInfo_t *pThis);
modInfo_t *(*GetNxtType)(modInfo_t *pThis, eModType_t rqtdType);
uchar *(*GetName)(modInfo_t *pThis);
uchar *(*GetStateName)(modInfo_t *pThis);
rsRetVal (*Use)(char *srcFile, modInfo_t *pThis); /**< must be called before a module is used (ref counting) */
rsRetVal (*Release)(char *srcFile, modInfo_t **ppThis); /**< release a module (ref counting) */
void (*PrintList)(void);
rsRetVal (*UnloadAndDestructAll)(eModLinkType_t modLinkTypesToUnload);
rsRetVal (*doModInit)(rsRetVal (*modInit)(), uchar *name, void *pModHdlr);
rsRetVal (*Load)(uchar *name);
rsRetVal (*SetModDir)(uchar *name);
ENDinterface(module)
#define moduleCURR_IF_VERSION 1 /* increment whenever you change the interface structure! */
/* prototypes */
PROTOTYPEObj(module);
/* TODO: remove them below (means move the config init code) -- rgerhards, 2008-02-19 */
extern uchar *pModDir; /* read-only after startup */
#endif /* #ifndef MODULES_H_INCLUDED */
/*
* vi:set ai:
*/
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