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To: cygwin AT cygwin DOT com
Subject: Re: RTLD_DEFAULT & RTLD_NEXT
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Reply-To: sds AT gnu DOT org
X-Attribution: Sam
X-Disclaimer: You should not expect anyone to agree with me.
From: Sam Steingold <sds AT gnu DOT org>
In-Reply-To: <20040831083258.GA7517@cygbert.vinschen.de> (Corinna Vinschen's message of "Tue, 31 Aug 2004 10:32:58 +0200")
References: <u65704sup DOT fsf AT gnu DOT org> <20040830143832 DOT GE17670 AT cygbert DOT vinschen DOT de> <uisb018x4 DOT fsf AT gnu DOT org> <20040831083258 DOT GA7517 AT cygbert DOT vinschen DOT de>
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Date: Tue, 31 Aug 2004 11:24:36 -0400
Message-ID: <u1xhn1gaz.fsf@gnu.org>
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> * Corinna Vinschen <pbevaan-pltjva AT pltjva DOT pbz> [2004-08-31 10:32:58 +0200]:
>
> On Aug 30 19:51, Sam Steingold wrote:
>> > * Corinna Vinschen <pbevaan-pltjva AT pltjva DOT pbz> [2004-08-30 16:38:32 +0200]:
>> >
>> > On Aug 30 10:13, Sam Steingold wrote:
>> >> <http://www.opengroup.org/onlinepubs/009695399/functions/dlsym.html>
>> >> Any plans to implement RTLD_DEFAULT & RTLD_NEXT?
>> >
>> > Nope, but you know http://cygwin.com/acronyms/#PTC , don't you? :-)
>> 
>> looks like there is no way in win32 to get the list of all open
>> libraries, is there?  (and no analogue for RTLD_DEFAULT either).
>
> EnumProcessModules.  This should also allow to implement RTLD_DEFAULT.

2004-08-31  Sam Steingold  <sds AT gnu DOT org>

	* dlfcn.cc (dlsym): Handle RTLD_DEFAULT using EnumProcessModules().
	* include/dlfcn.h (RTLD_DEFAULT): Define to NULL.


-- 
Sam Steingold (http://www.podval.org/~sds) running w2k
<http://www.camera.org> <http://www.iris.org.il> <http://www.memri.org/>
<http://www.mideasttruth.com/> <http://www.honestreporting.com>
Bill Gates is not god and Microsoft is not heaven.


Index: src/winsup/cygwin/include/dlfcn.h
===================================================================
RCS file: /cvs/src/src/winsup/cygwin/include/dlfcn.h,v
retrieving revision 1.2
diff -u -w -b -r1.2 dlfcn.h
--- src/winsup/cygwin/include/dlfcn.h	11 Sep 2001 20:01:01 -0000	1.2
+++ src/winsup/cygwin/include/dlfcn.h	31 Aug 2004 14:53:48 -0000
@@ -28,6 +28,7 @@
 extern void dlfork (int);
 
 /* following doesn't exist in Win32 API .... */
+#define RTLD_DEFAULT    NULL
 
 /* valid values for mode argument to dlopen */
 #define RTLD_LAZY	1	/* lazy function call binding */
Index: src/winsup/cygwin/dlfcn.cc
===================================================================
RCS file: /cvs/src/src/winsup/cygwin/dlfcn.cc,v
retrieving revision 1.23
diff -u -w -b -r1.23 dlfcn.cc
--- src/winsup/cygwin/dlfcn.cc	9 Feb 2004 04:04:22 -0000	1.23
+++ src/winsup/cygwin/dlfcn.cc	31 Aug 2004 14:53:48 -0000
@@ -112,7 +112,19 @@
 void *
 dlsym (void *handle, const char *name)
 {
-  void *ret = (void *) GetProcAddress ((HMODULE) handle, name);
+  void *ret = NULL;
+  if (handle == RTLD_DEFAULT) { /* search all modules */
+    HANDLE cur_proc = GetCurrentProcess();
+    HMODULE *modules;
+    DWORD needed, i;
+    EnumProcessModules(cur_proc,NULL,0,&needed);
+    modules = alloca(sizeof(HMODULE)*needed);
+    if (!EnumProcessModules(cur_proc,modules,needed,&needed))
+      set_dl_error ("dlsym");
+    for (i=0; i < needed/sizeof(HMODULE); i++)
+      if ((ret = (void*)GetProcAddress(modules[i],name)))
+        break;
+  } else ret = (void*)GetProcAddress((HMODULE)handle,name);
   if (!ret)
     set_dl_error ("dlsym");
   debug_printf ("ret %p", ret);

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