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From Yves Arrouye <y...@apple.com>
Subject config/2870: After a module has been removed from the modules list, it can't be put back in it.
Date Wed, 19 Aug 1998 01:49:43 GMT

>Number:         2870
>Category:       config
>Synopsis:       After a module has been removed from the modules list, it can't be put
back in it.
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    apache
>State:          open
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Tue Aug 18 18:50:01 PDT 1998
>Originator:     yves@apple.com
>Release:        1.3.1
Rhapsody yves 5.2 Kernel Release 5.2: Sun Aug  2 15:52:18 PDT 1998; root(rcbuilder):Objects/kernel-120.obj~4/RELEASE_PPC
Copyright (c) 1988-1995,1997-1998 Apple Computer, Inc. All Rights Reserved.  Power Macintosh
[DISCLAIMER: this could be a side-effect of the MacOS X Server port, but I doubt it as the
code concerned is http_config.c, which was not touched.]

When Apache with DSO modules is launched, it gets DSO modules, then call unload on them, then
loads them again and adds them at this point to the modules list. Unfortunately, a module
is only chained in the list if its next pointer is 0, but this pointer is not cleared when
the module is unchained. So Apache complains the second time and doesn't chain the module
back :-(

[Tue Aug 18 18:36:28 1998] [error] Cannot remove module mod_rewrite.c: not found in module
Have a module be dynamically loaded. Start Apache, then stop it. In the log, there is a message
about the module not being able to be removed.
Here it is.

--- src/main/http_config.c.orig Tue Aug 18 18:37:47 1998
+++ src/main/http_config.c      Tue Aug 18 18:37:43 1998
@@ -621,6 +621,8 @@
        /* Eliminate us from the module list */
        modp->next = modp->next->next;
+       /* And set our next module to null so we can be added back */
+       m->next = 0;
     m->module_index = -1;      /* simulate being unloaded, should
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