diff options
Diffstat (limited to 'runtime/modules.c')
| -rw-r--r-- | runtime/modules.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/runtime/modules.c b/runtime/modules.c index d5730ede..32ae659f 100644 --- a/runtime/modules.c +++ b/runtime/modules.c @@ -40,6 +40,7 @@ #include <time.h> #include <assert.h> #include <errno.h> +#include <pthread.h> #ifdef OS_BSD # include "libgen.h" #endif @@ -49,6 +50,10 @@ #include <unistd.h> #include <sys/file.h> +#ifdef OS_SOLARIS +# define PATH_MAX MAXPATHLEN +#endif + #include "cfsysline.h" #include "modules.h" #include "errmsg.h" @@ -57,6 +62,14 @@ DEFobjStaticHelpers DEFobjCurrIf(errmsg) +/* we must ensure that only one thread at one time tries to load or unload + * modules, otherwise we may see race conditions. This first came up with + * imdiag/imtcp, which both use the same stream drivers. Below is the mutex + * for that handling. + * rgerhards, 2009-05-25 + */ +static pthread_mutex_t mutLoadUnload; + static modInfo_t *pLoadedModules = NULL; /* list of currently-loaded modules */ static modInfo_t *pLoadedModulesLast = NULL; /* tail-pointer */ @@ -221,6 +234,8 @@ static rsRetVal queryHostEtryPt(uchar *name, rsRetVal (**pEtryPoint)()) *pEtryPoint = regCfSysLineHdlr; } else if(!strcmp((char*) name, "objGetObjInterface")) { *pEtryPoint = objGetObjInterface; + } else if(!strcmp((char*) name, "OMSRgetSupportedTplOpts")) { + *pEtryPoint = OMSRgetSupportedTplOpts; } else { *pEtryPoint = NULL; /* to be on the safe side */ ABORT_FINALIZE(RS_RET_ENTRY_POINT_NOT_FOUND); @@ -347,6 +362,7 @@ static rsRetVal doModInit(rsRetVal (*modInit)(int, int*, rsRetVal(**)(), rsRetVal(*)(), modInfo_t*), uchar *name, void *pModHdlr) { DEFiRet; + rsRetVal localRet; modInfo_t *pNew = NULL; rsRetVal (*modGetType)(eModType_t *pType); @@ -391,6 +407,10 @@ doModInit(rsRetVal (*modInit)(int, int*, rsRetVal(**)(), rsRetVal(*)(), modInfo_ CHKiRet((*pNew->modQueryEtryPt)((uchar*)"parseSelectorAct", &pNew->mod.om.parseSelectorAct)); CHKiRet((*pNew->modQueryEtryPt)((uchar*)"isCompatibleWithFeature", &pNew->isCompatibleWithFeature)); CHKiRet((*pNew->modQueryEtryPt)((uchar*)"tryResume", &pNew->tryResume)); + /* try load optional interfaces */ + localRet = (*pNew->modQueryEtryPt)((uchar*)"doHUP", &pNew->doHUP); + if(localRet != RS_RET_OK && localRet != RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) + ABORT_FINALIZE(localRet); break; case eMOD_LIB: break; @@ -468,6 +488,8 @@ modUnlinkAndDestroy(modInfo_t **ppThis) pThis = *ppThis; assert(pThis != NULL); + pthread_mutex_lock(&mutLoadUnload); + /* first check if we are permitted to unload */ if(pThis->eType == eMOD_LIB) { if(pThis->uRefCnt > 0) { @@ -502,6 +524,7 @@ modUnlinkAndDestroy(modInfo_t **ppThis) moduleDestruct(pThis); finalize_it: + pthread_mutex_unlock(&mutLoadUnload); RETiRet; } @@ -576,6 +599,8 @@ Load(uchar *pModName) assert(pModName != NULL); dbgprintf("Requested to load module '%s'\n", pModName); + pthread_mutex_lock(&mutLoadUnload); + iModNameLen = strlen((char *) pModName); if(iModNameLen > 3 && !strcmp((char *) pModName + iModNameLen - 3, ".so")) { iModNameLen -= 3; @@ -599,7 +624,7 @@ Load(uchar *pModName) iLoadCnt = 0; do { /* now build our load module name */ - if(*pModName == '/') { + if(*pModName == '/' || *pModName == '.') { *szPath = '\0'; /* we do not need to append the path - its already in the module name */ iPathLen = 0; } else { @@ -685,6 +710,7 @@ Load(uchar *pModName) } finalize_it: + pthread_mutex_unlock(&mutLoadUnload); RETiRet; } @@ -780,6 +806,15 @@ BEGINObjClassExit(module, OBJ_IS_LOADABLE_MODULE) /* CHANGE class also in END MA CODESTARTObjClassExit(module) /* release objects we no longer need */ objRelease(errmsg, CORE_COMPONENT); + /* We have a problem in our reference counting, which leads to this function + * being called too early. This usually is no problem, but if we destroy + * the mutex object, we get into trouble. So rather than finding the root cause, + * we do not release the mutex right now and have a very, very slight leak. + * We know that otherwise no bad effects happen, so this acceptable for the + * time being. -- rgerhards, 2009-05-25 + * + * TODO: add again: pthread_mutex_destroy(&mutLoadUnload); + */ # ifdef DEBUG modUsrPrintAll(); /* debug aid - TODO: integrate with debug.c, at least the settings! */ @@ -822,6 +857,7 @@ ENDobjQueryInterface(module) */ BEGINAbstractObjClassInit(module, 1, OBJ_IS_CORE_MODULE) /* class, version - CHANGE class also in END MACRO! */ uchar *pModPath; + pthread_mutexattr_t mutAttr; /* use any module load path specified in the environment */ if((pModPath = (uchar*) getenv("RSYSLOG_MODDIR")) != NULL) { @@ -839,6 +875,10 @@ BEGINAbstractObjClassInit(module, 1, OBJ_IS_CORE_MODULE) /* class, version - CHA SetModDir(glblModPath); } + pthread_mutexattr_init(&mutAttr); + pthread_mutexattr_settype(&mutAttr, PTHREAD_MUTEX_RECURSIVE); + pthread_mutex_init(&mutLoadUnload, &mutAttr); + /* request objects we use */ CHKiRet(objUse(errmsg, CORE_COMPONENT)); ENDObjClassInit(module) |