Refactor dlopen() support

Nowadays, all platforms except Windows and older HP-UX have standard
dlopen() support.  So having a separate implementation per platform
under src/backend/port/dynloader/ is a bit excessive.  Instead, treat
dlopen() like other library functions that happen to be missing
sometimes and put a replacement implementation under src/port/.

Discussion: https://www.postgresql.org/message-id/flat/e11a49cb-570a-60b7-707d-7084c8de0e61%402ndquadrant.com#54e735ae37476a121abb4e33c2549b03

1 files changed, 0 insertions, 68 deletions

diff --git a/src/backend/port/dynloader/hpux.c b/src/backend/port/dynloader/hpux.c
deleted file mode 100644
index d82dd7603bf..00000000000
--- a/src/backend/port/dynloader/hpux.c
+++ /dev/null
@@ -1,68 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * dynloader.c
- *	  dynamic loader for HP-UX using the shared library mechanism
- *
- * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- *
- * IDENTIFICATION
- *	  src/backend/port/dynloader/hpux.c
- *
- *	NOTES
- *		all functions are defined here -- it's impossible to trace the
- *		shl_* routines from the bundled HP-UX debugger.
- *
- *-------------------------------------------------------------------------
- */
-#include "postgres.h"
-
-/* System includes */
-#include <a.out.h>
-#include <dl.h>
-
-#include "dynloader.h"
-#include "utils/dynamic_loader.h"
-
-void *
-pg_dlopen(const char *filename)
-{
-	/*
-	 * Use BIND_IMMEDIATE so that undefined symbols cause a failure return
-	 * from shl_load(), rather than an abort() later on when we attempt to
-	 * call the library!
-	 */
-	shl_t		handle = shl_load(filename,
-								  BIND_IMMEDIATE | BIND_VERBOSE | DYNAMIC_PATH,
-								  0L);
-
-	return (void *) handle;
-}
-
-PGFunction
-pg_dlsym(void *handle, const char *funcname)
-{
-	PGFunction	f;
-
-	if (shl_findsym((shl_t *) & handle, funcname, TYPE_PROCEDURE, &f) == -1)
-		f = (PGFunction) NULL;
-	return f;
-}
-
-void
-pg_dlclose(void *handle)
-{
-	shl_unload((shl_t) handle);
-}
-
-char *
-pg_dlerror(void)
-{
-	static char errmsg[] = "shl_load failed";
-
-	if (errno)
-		return strerror(errno);
-
-	return errmsg;
-}