/usr/include/postgresql/8.4/server/dynloader.h is in postgresql-server-dev-8.4 8.4.11-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | /*-------------------------------------------------------------------------
 *
 * linux.h
 *		Port-specific prototypes for Linux
 *
 *
 * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * $PostgreSQL: pgsql/src/backend/port/dynloader/linux.h,v 1.28 2009/01/01 17:23:46 momjian Exp $
 *
 *-------------------------------------------------------------------------
 */
#ifndef PORT_PROTOS_H
#define PORT_PROTOS_H
#include "utils/dynamic_loader.h"
#ifdef HAVE_DLOPEN
#include <dlfcn.h>
#endif
#ifdef HAVE_DLOPEN
/*
 * In some older systems, the RTLD_NOW flag isn't defined and the mode
 * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
 * if available, but it doesn't exist everywhere.
 * If it doesn't exist, set it to 0 so it has no effect.
 */
#ifndef RTLD_NOW
#define RTLD_NOW 1
#endif
#ifndef RTLD_GLOBAL
#define RTLD_GLOBAL 0
#endif
#define pg_dlopen(f)	dlopen((f), RTLD_NOW | RTLD_GLOBAL)
#define pg_dlsym		dlsym
#define pg_dlclose		dlclose
#define pg_dlerror		dlerror
#endif   /* HAVE_DLOPEN */
#endif   /* PORT_PROTOS_H */
 |