Add the possibility to have symbols loaded globally with DSO.

CHANGES

@@ -4,6 +4,9 @@
 
  Changes between 0.9.7c and 0.9.8  [xx XXX xxxx]
 
+  *) Add the possibility to load symbols globally with DSO.
+     [Götz Babin-Ebell <babin-ebell@trustcenter.de> via Richard Levitte]
+
   *) Add the functions ERR_set_mark() and ERR_pop_to_mark() for better
      control of the error stack.
      [Richard Levitte]

crypto/dso/dso.h

@@ -95,6 +95,13 @@ extern "C" {
  */
 #define DSO_FLAG_UPCASE_SYMBOL			0x10
 
+/* This flag loads the library with public symbols.
+ * Meaning: The exported symbols of this library are public
+ * to all libraries loaded after this library.
+ * At the moment only implemented in unix.
+ */
+#define DSO_FLAG_GLOBAL_SYMBOLS			0x20
+
 
 typedef void (*DSO_FUNC_TYPE)(void);
 

crypto/dso/dso_dlfcn.c

@@ -140,13 +140,19 @@ static int dlfcn_load(DSO *dso)
 	void *ptr = NULL;
 	/* See applicable comments in dso_dl.c */
 	char *filename = DSO_convert_filename(dso, NULL);
+	int flags = DLOPEN_FLAG;
 
 	if(filename == NULL)
 		{
 		DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME);
 		goto err;
 		}
-	ptr = dlopen(filename, DLOPEN_FLAG);
+
+#ifdef RTLD_GLOBAL
+	if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
+		flags |= RTLD_GLOBAL;
+#endif
+	ptr = dlopen(filename, flags);
 	if(ptr == NULL)
 		{
 		DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED);