1 files changed, 75 insertions, 0 deletions
diff --git a/src/backend/port/dynloader/ultrix4.c b/src/backend/port/dynloader/ultrix4.c
new file mode 100644
index 00000000000..7d1d493c2bc
--- /dev/null
+++ b/src/backend/port/dynloader/ultrix4.c
@@ -0,0 +1,75 @@
+/*-------------------------------------------------------------------------
+ *
+ * dynloader.c--
+ *	  This dynamic loader uses Andrew Yu's libdl-1.0 package for Ultrix 4.x.
+ *	  (Note that pg_dlsym and pg_dlclose are actually macros defined in
+ *	  "port-protos.h".)
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *	  $Header: /cvsroot/pgsql/src/backend/port/dynloader/ultrix4.c,v 1.1 1998/03/10 05:23:40 scrappy Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#include <stdio.h>
+#include <postgres.h>
+#include "dl.h"
+#include <utils/dynamic_loader.h>
+#include "c.h"
+#include "fmgr.h"
+#include "port-protos.h"
+#include "utils/elog.h"
+
+extern char pg_pathname[];
+
+void *
+pg_dlopen(char *filename)
+{
+	static int	dl_initialized = 0;
+	void	   *handle;
+
+	/*
+	 * initializes the dynamic loader with the executable's pathname.
+	 * (only needs to do this the first time pg_dlopen is called.)
+	 */
+	if (!dl_initialized)
+	{
+		if (!dl_init(pg_pathname))
+		{
+			return NULL;
+		}
+
+		/*
+		 * if there are undefined symbols, we want dl to search from the
+		 * following libraries also.
+		 */
+		dl_setLibraries("/usr/lib/libm_G0.a:/usr/lib/libc_G0.a");
+		dl_initialized = 1;
+	}
+
+	/*
+	 * open the file. We do the symbol resolution right away so that we
+	 * will know if there are undefined symbols. (This is in fact the same
+	 * semantics as "ld -A". ie. you cannot have undefined symbols.
+	 */
+	if ((handle = dl_open(filename, DL_NOW)) == NULL)
+	{
+		int			count;
+		char	  **list = dl_undefinedSymbols(&count);
+
+		/* list the undefined symbols, if any */
+		if (count)
+		{
+			elog(NOTICE, "dl: Undefined:");
+			while (*list)
+			{
+				elog(NOTICE, "  %s", *list);
+				list++;
+			}
+		}
+	}
+
+	return (void *) handle;
+}