Description:
------------
There is a problem in function ifx_do_close which can lead to crash during module shutdown.
The function ifx_do_close is called during shutdown from list destrucors _close_ifx_link and _close_ifx_plink. If something goes wrong in this function, error reporting is performed and emalloc is called. Calling emalloc is not possible during memory destruction and can cause segfault.
It is necessary to remove all error reporting from ifx_do_close (which is in fact useless).

Here is a patch:

--- ifx.ec.orig	2004-06-01 02:52:14.000000000 +0200
+++ ifx.ec	2004-06-22 18:46:01.000000000 +0200
@@ -295,7 +295,6 @@
 	PARAMETER char *link;
 EXEC SQL END DECLARE SECTION;
 {
-	char *ifx_err = NULL;
 	TSRMLS_FETCH();
 
 	EXEC SQL SET CONNECTION :link;
@@ -310,32 +309,12 @@
 			if (ifx_check() == 0)   {
 				/* DISCONNECT again, after rollback */
 				EXEC SQL DISCONNECT :link;
-				if (ifx_check() < 0)   {
-					IFXG(sv_sqlcode) = SQLCODE;
-					php_error_docref(NULL TSRMLS_CC, E_WARNING, "Disconnect link %s after Automatic Rollback fails (%s)", link, (ifx_err = ifx_error(link)));
 				}
-			}
-			if (ifx_check() < 0)   {
+			else if (ifx_check() < 0)   {
 				/* CLOSE database if rollback or disconnect fails */
 				EXEC SQL CLOSE DATABASE;
-				if (ifx_check() < 0)   {
-					IFXG(sv_sqlcode) = SQLCODE;
-					php_error_docref(NULL TSRMLS_CC, E_WARNING, "Close database fails %s (%s)", link, (ifx_err = ifx_error(link)));
-				}
 			}
 		}
-		else if (SQLCODE < 0)   {
-			IFXG(sv_sqlcode) = SQLCODE;
-			php_error_docref(NULL TSRMLS_CC, E_WARNING, "Disconnect link %s fails (%s)", link, (ifx_err = ifx_error(link)));
-		}
-	}       
-	else   {
-		IFXG(sv_sqlcode) = SQLCODE;
-		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Set connection %s fails (%s)", link, (ifx_err = ifx_error(link)));
-	}
-
-	if (ifx_err) {
-		efree(ifx_err);
 	}
 }