netbsd.h

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

/*-------------------------------------------------------------------------
 *
 * netbsd.h
 *	  port-specific prototypes for NetBSD
 *
 *
 * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * $PostgreSQL: pgsql/src/backend/port/dynloader/netbsd.h,v 1.14 2004/12/31 22:00:32 pgsql Exp $
 *
 *-------------------------------------------------------------------------
 */
#ifndef PORT_PROTOS_H
#define PORT_PROTOS_H

#include <sys/types.h>
#include <nlist.h>
#include <link.h>
#include <dlfcn.h>

#include "utils/dynamic_loader.h"

/*
 * Dynamic Loader on NetBSD 1.0.
 *
 * this dynamic loader uses the system dynamic loading interface for shared
 * libraries (ie. dlopen/dlsym/dlclose). The user must specify a shared
 * library as the file to be dynamically loaded.
 *
 * agc - I know this is all a bit crufty, but it does work, is fairly
 * portable, and works (the stipulation that the d.l. function must
 * begin with an underscore is fairly tricky, and some versions of
 * NetBSD (like 1.0, and 1.0A pre June 1995) have no dlerror.)
 */

/*
 * 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)    BSD44_derived_dlopen((f), RTLD_NOW | RTLD_GLOBAL)
#define		   pg_dlsym		   BSD44_derived_dlsym
#define		   pg_dlclose	   BSD44_derived_dlclose
#define		   pg_dlerror	   BSD44_derived_dlerror

char	   *BSD44_derived_dlerror(void);
void	   *BSD44_derived_dlopen(const char *filename, int num);
void	   *BSD44_derived_dlsym(void *handle, const char *name);
void		BSD44_derived_dlclose(void *handle);

#endif   /* PORT_PROTOS_H */