Real dynamic loader code

diff --git a/src/backend/port/dynloader/darwin.c b/src/backend/port/dynloader/darwin.c
index fa39a7dd319b0e05e2ee927d91fefdea130e9963..55ae1692183b76db3a9a8f871c91a150377b2c63 100644 (file)
--- a/src/backend/port/dynloader/darwin.c
+++ b/src/backend/port/dynloader/darwin.c
@@ -1,36 +1,42 @@
 /*
- * This is a place holder until someone supplies a dynamic loader
- * interface for this platform.
+ * These routines were taken from the Apache source, but were made
+ * available with a PostgreSQL-compatible license.  Kudos Wilfredo
+ * Sánchez <wsanchez@apple.com>.
  *
- * $Header: /cvsroot/pgsql/src/backend/port/dynloader/darwin.c,v 1.1 2000/10/31 19:55:19 petere Exp $
+ * $Header: /cvsroot/pgsql/src/backend/port/dynloader/darwin.c,v 1.2 2000/11/09 19:00:50 petere Exp $
  */
 
-#include "postgres.h"
-#include "fmgr.h"
-#include "utils/dynamic_loader.h"
+#include <mach-o/dyld.h>
 #include "dynloader.h"
 
-void *
-pg_dlopen(char *filename)
+void *pg_dlopen(const char *filename)
 {
-       return (void *) NULL;
+       NSObjectFileImage image;
+
+       if (NSCreateObjectFileImageFromFile(filename, &image) !=
+               NSObjectFileImageSuccess)
+               return NULL;
+       return NSLinkModule(image, filename, TRUE);
 }
 
-PGFunction
-pg_dlsym(void *handle, char *funcname)
+void pg_dlclose(void *handle)
 {
-       return NULL;
+       NSUnLinkModule(handle,FALSE);
+       return;
 }
 
-void
-pg_dlclose(void *handle)
+PGFunction *pg_dlsym(void *handle, const char *funcname)
 {
+       NSSymbol symbol;
+       char *symname = (char*)malloc(strlen(funcname)+2);
+
+       sprintf(symname, "_%s", funcname);
+       symbol = NSLookupAndBindSymbol(symname);
+       free(symname);
+       return (PGFunction *) NSAddressOfSymbol(symbol);
 }
 
-char *
-pg_dlerror()
+const char *pg_dlerror(void)
 {
-       static char errmsg[] = "the dynamic loader for darwin doesn't exist yet";
-
-       return errmsg;
+       return "no error message available";
 }

diff --git a/src/backend/port/dynloader/darwin.h b/src/backend/port/dynloader/darwin.h
index 9ab7e85761508dd0561b91ed896dca9bf0b31b17..36ba3f348862915332ff143355ff09f1b6dcdc31 100644 (file)
--- a/src/backend/port/dynloader/darwin.h
+++ b/src/backend/port/dynloader/darwin.h
@@ -1,5 +1,8 @@
-/* $Header: /cvsroot/pgsql/src/backend/port/dynloader/darwin.h,v 1.1 2000/10/31 19:55:19 petere Exp $ */
-void      *pg_dlopen(char *filename);
-PGFunction     pg_dlsym(void *handle, char *funcname);
+/* $Header: /cvsroot/pgsql/src/backend/port/dynloader/darwin.h,v 1.2 2000/11/09 19:00:50 petere Exp $ */
+
+#include "fmgr.h"
+
+void      *pg_dlopen(const char *filename);
+PGFunction     pg_dlsym(void *handle, const char *funcname);
 void           pg_dlclose(void *handle);
-char      *pg_dlerror();
+const char *pg_dlerror(void);