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/*
* $Id$
*
* Copyright (c) 1994, 1995. Netscape Communications Corporation. All
* rights reserved.
*
* Use of this software is governed by the terms of the license agreement for
* the Netscape Communications or Netscape Comemrce Server between the
* parties.
*/
/* ------------------------------------------------------------------------ */
/*
* dll.h: Handle dynamically linked libraries
*
* Rob McCool
*/
#ifndef _DLL_H
#define _DLL_H
#include "systems.h"
#if defined(DLL_CAPABLE)
/* --------------------------- Data structures ---------------------------- */
#if defined(USE_NSPR)
#include <nspr/prlink.h>
typedef int DLHANDLE;
#elif defined(DLL_DLOPEN)
#include <dlfcn.h>
typedef void *DLHANDLE; /* DLOPEN */
#elif defined(DLL_HPSHL)
#include <dl.h>
typedef shl_t DLHANDLE; /* HP_SHL */
#elif defined(DLL_WIN32)
typedef HINSTANCE DLHANDLE; /* WIN32 */
#endif
/* ------------------------------ Prototypes ------------------------------ */
/*
* dll_open loads the library at the given path into memory, and returns
* a handle to be used in later calls to dll_findsym and dll_close.
*/
#if defined(USE_NSPR)
#define dll_open(libfn) PR_LoadLibrary(libfn)
#elif defined(DLL_DLOPEN)
#define dll_open(libfn) dlopen(libfn, DLL_DLOPEN_FLAGS)
#elif defined(DLL_HPSHL)
#define dll_open(libfn) shl_load((libfn), BIND_IMMEDIATE, NULL)
#elif defined(DLL_WIN32)
DLHANDLE dll_open(char *libfn);
#endif
/*
* dll_findsym looks for a symbol with the given name in the library
* pointed to by the given handle. Returns a pointer to the named function.
*/
#if defined(USE_NSPR)
#define dll_findsym(dlp, name) PR_FindSymbol(name)
#elif defined(DLL_DLOPEN)
#define dll_findsym(dlp, name) dlsym(dlp, name)
#elif defined(DLL_HPSHL)
void *dll_findsym(DLHANDLE dlp, char *name);
#elif defined(DLL_WIN32)
#define dll_findsym(dlp, name) GetProcAddress(dlp, name)
#endif
/*
* dll_error returns a string describing the last error on the given handle
*/
#if defined(USE_NSPR)
#define dll_error(dlp) system_errmsg(0)
#elif defined(DLL_DLOPEN)
#define dll_error(dlp) dlerror()
#elif defined(DLL_HPSHL)
#define dll_error(dlp) system_errmsg(0)
#elif defined(DLL_WIN32)
#define dll_error(dlp) system_errmsg(0)
#endif
/*
* dll_close closes the previously opened library given by handle
*/
#if defined(USE_NSPR)
int dll_close(void *arg);
#elif defined(DLL_DLOPEN)
#define dll_close dlclose
#elif defined (DLL_HPSHL)
#define dll_close shl_unload
#elif defined(DLL_WIN32)
#define dll_close FreeLibrary
#endif
#endif /* DLL_CAPABLE */
#endif
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