added more documentation and dlopen/dlclose, must backport shared library building from SMERP first

1 files changed, 47 insertions, 5 deletions

diff --git a/src/library/loader.c b/src/library/loader.c
index e0bb055..1f8ce20 100644
--- a/src/library/loader.c
+++ b/src/library/loader.c
@@ -16,20 +16,62 @@
 */
 
 #include "library/loader.h"
+#include "port/sys_internal.h"
 #include "port/unused.h"
 
 #include "port/stdlib.h"		/* for malloc, free */
 
+#ifdef HAVE_DLFCN
+#include <dlfcn.h>                      /* for dlopen. dlclose functions */
+#endif
+
 struct wolf_library_t {
-	char dummy;			/**< dummy */
+	void *handle;			/**< the OS handle for the library */
 };
 
 wolf_library_p wolf_library_load( const char *name, wolf_error_t *error ) {
-	WOLF_UNUSED( name );
+	wolf_library_p l;
+	int flags = 0;
+
+	l = (struct wolf_library_t *)malloc( sizeof ( struct wolf_library_t ) );
+	if( l == NULL ) {
+		*error = WOLF_ERR_OUT_OF_MEMORY;
+		return NULL;
+	}
+
+#if defined HAVE_DLFCN
+	/* TODO: Apache has a flags variable and a direct parameter version, find out why..
+	 * also make up our bind how many flags we should "leak" to the application layer
+	 */
+	flags = RTLD_NOW | RTLD_LOCAL;
+
+	l->handle = dlopen( name, flags );
+	if( l->handle == NULL ) {
+		*error = WOLF_ERR_INTERNAL;
+		return NULL;
+	}
+#else
+#error Not using DLFCN as shared loader. Port first!
+#endif
+
 	*error = WOLF_OK;
-	return NULL;
+	return l;
 }
 
-void wolf_library_unload( wolf_library_p library ) {
-	WOLF_UNUSED( library );
+wolf_error_t wolf_library_unload( wolf_library_p l ) {
+	int res = 0;
+
+	if( l == NULL || l->handle == NULL ) {
+		return WOLF_ERR_INVALID_STATE;
+	}
+
+	res = dlclose( l->handle );
+	if( res != 0 ) {
+		return WOLF_ERR_INVALID_STATE;
+	}
+
+	free( l );
+	l = NULL;
+
+	return WOLF_OK;
 }