* cygheap.cc (cygheap_fixup_in_child): Call set_dll_dir.

(init_cygheap::init_installation_root): Just memmove contents of
	installation_root instead of calling GetModuleFileNameW again.
	Copy installation_root to installation_dir before stripping of
	"bin" dir.  Don't call SetDllDirectory here.  Explain what we do.
	(setup_cygheap): New function taking over initial cygheap setup
	from memory_init.  Additionally call set_dll_dir.
	* cygheap.h (struct init_cygheap): Add installation_dir member.
	(init_cygheap::set_dll_dir): Define.
	(setup_cygheap): Declare.
	* dcrt0.cc: Throughout drop parameter from memory_init call.
	(dll_crt0_0): Call setup_cygheap prior to memory_init.
	* dlfcn.cc (dlopen): Change comment to point to the right function.
	* shared.cc (memory_init): Drop parameter.  Drop cygheap setup.
	* shared_info.h (memory_init): Change declaration accordingly.

winsup/cygwin/ChangeLog

@@ -1,3 +1,21 @@
+2014-10-17  Corinna Vinschen  <corinna@vinschen.de>
+
+	* cygheap.cc (cygheap_fixup_in_child): Call set_dll_dir.
+	(init_cygheap::init_installation_root): Just memmove contents of
+	installation_root instead of calling GetModuleFileNameW again.
+	Copy installation_root to installation_dir before stripping of
+	"bin" dir.  Don't call SetDllDirectory here.  Explain what we do.
+	(setup_cygheap): New function taking over initial cygheap setup
+	from memory_init.  Additionally call set_dll_dir.
+	* cygheap.h (struct init_cygheap): Add installation_dir member.
+	(init_cygheap::set_dll_dir): Define.
+	(setup_cygheap): Declare.
+	* dcrt0.cc: Throughout drop parameter from memory_init call.
+	(dll_crt0_0): Call setup_cygheap prior to memory_init.
+	* dlfcn.cc (dlopen): Change comment to point to the right function.
+	* shared.cc (memory_init): Drop parameter.  Drop cygheap setup.
+	* shared_info.h (memory_init): Change declaration accordingly.
+
 2014-10-17  Corinna Vinschen  <corinna@vinschen.de>
 
 	* cygtls.h (__try): Define __l_endtry as block-local label in 32 bit

winsup/cygwin/cygheap.cc

@@ -83,6 +83,7 @@ cygheap_fixup_in_child (bool execed)
   _csbrk ((char *) child_proc_info->cygheap_max - (char *) cygheap);
   child_copy (child_proc_info->parent, false, "cygheap", cygheap, cygheap_max, NULL);
   cygheap_init ();
+  cygheap->set_dll_dir ();
   debug_fixup_after_fork_exec ();
   if (execed)
     {
@@ -147,16 +148,16 @@ init_cygheap::init_installation_root ()
   PWCHAR p = installation_root;
   if (wcsncasecmp (p, L"\\\\", 2))	/* Normal drive letter path */
     {
-      p = wcpcpy (p, L"\\??\\");
+      memmove (p + 4, p, PATH_MAX - 4);
-      GetModuleFileNameW (cygwin_hmodule, p, PATH_MAX - 4);
+      p = wcpncpy (p, L"\\\\?\\", 4);
     }
   else
     {
       bool unc = false;
       if (wcsncmp (p + 2, L"?\\", 2))	/* No long path prefix, so UNC path. */
 	{
-	  p = wcpcpy (p, L"\\??\\UN");
+	  memmove (p + 6, p, PATH_MAX - 6);
-	  GetModuleFileNameW (cygwin_hmodule, p, PATH_MAX - 6);
+	  p = wcpncpy (p, L"\\??\\UN", 6);
 	  *p = L'C';
 	  unc = true;
 	}
@@ -175,6 +176,7 @@ init_cygheap::init_installation_root ()
   RtlInt64ToHexUnicodeString (hash_path_name (0, installation_root),
 			      &installation_key, FALSE);
 
+  /* Strip off last path component ("\\cygwin1.dll") */
   PWCHAR w = wcsrchr (installation_root, L'\\');
   if (w)
     {
@@ -185,13 +187,11 @@ init_cygheap::init_installation_root ()
     api_fatal ("Can't initialize Cygwin installation root dir.\n"
 	       "Invalid DLL path");
 
-  /* Remove "." from DLL search path and install our /bin dir instead.
+  /* Copy result into installation_dir before stripping off "bin" dir and
-     Note that this change is propagated to child processes so we don't
+     revert to Win32 path.  This path is used in cygheap_init to call
-     have to call SetDllDirectory in each process. */
+     SetDllDirectory. */
-  installation_root[1] = L'\\';
+  wcpncpy (installation_dir, installation_root, PATH_MAX);
-  if (!SetDllDirectoryW (installation_root))
+  installation_dir[1] = L'\\';
-    debug_printf ("Couldn't set %W as DLL directory, %E", installation_root);
-  installation_root[1] = L'?';
 
   /* If w < p, the Cygwin DLL resides in the root dir of a drive or network
      path.  In that case, if we strip off yet another backslash, the path
@@ -213,8 +213,7 @@ init_cygheap::init_installation_root ()
   if (cygwin_props.disable_key)
     {
       installation_key.Length = 0;
-      installation_key.Buffer[0] = L'\0';
+      installation_key.Buffer[0] = L'\0'; }
-    }
 }
 
 void __stdcall
@@ -257,6 +256,18 @@ cygheap_init ()
   cygheap->init_tls_list ();
 }
 
+/* Initial Cygwin heap setup.
+   Called by root process of a Cygwin process tree. */
+void
+setup_cygheap ()
+{
+  cygheap_init ();
+  cygheap->user.init ();
+  cygheap->init_installation_root (); /* Requires user.init! */
+  cygheap->set_dll_dir ();
+  cygheap->pg.init ();
+}
+
 #define nextpage(x) ((char *) roundup2 ((uintptr_t) (x), \
 					wincap.allocation_granularity ()))
 #define allocsize(x) ((SIZE_T) nextpage (x))

winsup/cygwin/cygheap.h

@@ -505,6 +505,7 @@ struct init_cygheap: public mini_cygheap
   unsigned bucket_val[NBUCKETS];
   char *buckets[NBUCKETS];
   WCHAR installation_root[PATH_MAX];
+  WCHAR installation_dir[PATH_MAX];
   UNICODE_STRING installation_key;
   WCHAR installation_key_buf[18];
   cygheap_root root;
@@ -533,6 +534,15 @@ struct init_cygheap: public mini_cygheap
   hook_chain hooks;
   void close_ctty ();
   void init_installation_root ();
+  void set_dll_dir ()
+  {
+    /* Call SetDllDirectory on installation_dir.  This removes "." from the
+       DLL search path and installs our /bin dir instead.
+       Amazing but true:  This setting is propagated to child processes :-)
+			  but only starting with Windows 8 :-( */
+    if (!SetDllDirectoryW (installation_dir))
+      debug_printf ("SetDllDirectoryW (%W), %E", installation_dir);
+  }
   void __reg1 init_tls_list ();;
   void __reg2 add_tls (_cygtls *);
   void __reg3 remove_tls (_cygtls *, DWORD);
@@ -666,4 +676,5 @@ class cygheap_fdenum : public cygheap_fdmanip
 
 void __stdcall cygheap_fixup_in_child (bool);
 void __stdcall cygheap_init ();
+void setup_cygheap ();
 extern char _cygheap_start[] __attribute__((section(".idata")));

winsup/cygwin/dcrt0.cc

@@ -609,7 +609,7 @@ void
 child_info_fork::handle_fork ()
 {
   cygheap_fixup_in_child (false);
-  memory_init (false);
+  memory_init ();
   myself.thisproc (NULL);
   myself->uid = cygheap->user.real_uid;
   myself->gid = cygheap->user.real_gid;
@@ -663,7 +663,7 @@ child_info_spawn::handle_spawn ()
   if (!dynamically_loaded || get_parent_handle ())
       {
 	cygheap_fixup_in_child (true);
-	memory_init (false);
+	memory_init ();
       }
   if (!moreinfo->myself_pinfo ||
       !DuplicateHandle (GetCurrentProcess (), moreinfo->myself_pinfo,
@@ -769,7 +769,8 @@ dll_crt0_0 ()
 
   if (!child_proc_info)
     {
-      memory_init (true);
+      setup_cygheap ();
+      memory_init ();
 #ifndef __x86_64__
       /* WOW64 process on XP/64 or Server 2003/64?  Check if we have been
 	 started from 64 bit process and if our stack is at an unusual

winsup/cygwin/dlfcn.cc

@@ -166,10 +166,10 @@ dlopen (const char *name, int flags)
 		{
 		  /* This may indicate that a dependent DLL could not be loaded.
 		     Typically this occurs because we removed the CWD from the
-		     DLL search path via SetDllDirectory
+		     DLL search path via SetDllDirectory (see inline function
-		     (see init_cygheap::init_installation_root), and the load
+		     init_cygheap::set_dll_dir), and the load mechanism expects
-		     mechanism expects that dlopening a DLL from the CWD allows
+		     that dlopening a DLL from the CWD allows to load dependent
-		     to load dependent DLLs from the same dir.
+		     DLLs from the same dir.
  
 		     To continue supporting this scenario, call LoadLibraryEx
 		     with the LOAD_WITH_ALTERED_SEARCH_PATH flag.  This flag

winsup/cygwin/shared.cc

@@ -343,17 +343,8 @@ shared_info::initialize ()
 }
 
 void
-memory_init (bool init_cygheap)
+memory_init ()
 {
-  /* Initialize the Cygwin heap, if necessary */
-  if (init_cygheap)
-    {
-      cygheap_init ();
-      cygheap->user.init ();
-      cygheap->init_installation_root (); /* Requires user.init! */
-      cygheap->pg.init ();
-    }
-
   shared_info::create ();	/* Initialize global shared memory */
   user_info::create (false);	/* Initialize per-user shared memory */
   /* Initialize tty list session stuff.  Doesn't really belong here but

winsup/cygwin/shared_info.h

@@ -75,7 +75,7 @@ enum shared_locations
 
 };
 
-void __reg1 memory_init (bool);
+void memory_init ();
 void __stdcall shared_destroy ();
 
 #define shared_align_past(p) \