diff options
Diffstat (limited to 'runtime/glbl.c')
| -rw-r--r-- | runtime/glbl.c | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/runtime/glbl.c b/runtime/glbl.c index b3fe3a1d..bcb37953 100644 --- a/runtime/glbl.c +++ b/runtime/glbl.c @@ -32,6 +32,7 @@ #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> +#include <pthread.h> #include <assert.h> #include "rsyslog.h" @@ -379,17 +380,24 @@ GetLocalDomain(void) /* generate the local hostname property. This must be done after the hostname info * has been set as well as PreserveFQDN. * rgerhards, 2009-06-30 + * NOTE: This function DELIBERATELY introduces a small memory leak in order to gain + * speed. Each time it is called when a property name already exists, a new one is + * allocated but the previous one is NOT freed. This is so that current readers can + * continue to use the previous name. Otherwise, we would need to use read/write locks + * to protect the update process. As this function is called extremely infrequently and + * the memory leak is very small, this is totally accessible. Think that otherwise we + * would need to place a read look each time the property is read, which is much more + * frequent (once per message for the modules that use this local hostname!). + * rgerhards, 2013-10-28 */ static rsRetVal GenerateLocalHostNameProperty(void) { - DEFiRet; + prop_t *hostnameNew; uchar *pszName; + DEFiRet; - if(propLocalHostName != NULL) - prop.Destruct(&propLocalHostName); - - CHKiRet(prop.Construct(&propLocalHostName)); + CHKiRet(prop.Construct(&hostnameNew)); if(LocalHostNameOverride == NULL) { if(LocalHostName == NULL) pszName = (uchar*) "[localhost]"; @@ -403,8 +411,11 @@ GenerateLocalHostNameProperty(void) pszName = LocalHostNameOverride; } DBGPRINTF("GenerateLocalHostName uses '%s'\n", pszName); - CHKiRet(prop.SetString(propLocalHostName, pszName, ustrlen(pszName))); - CHKiRet(prop.ConstructFinalize(propLocalHostName)); + CHKiRet(prop.SetString(hostnameNew, pszName, ustrlen(pszName))); + CHKiRet(prop.ConstructFinalize(hostnameNew)); + + propLocalHostName = hostnameNew; + /* inititional MEM LEAK for old value -- see function hdr comment! */ finalize_it: RETiRet; |