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141 lines
4.8 KiB
C
141 lines
4.8 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.1 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef prlink_h___
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#define prlink_h___
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/*
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** API to static and dynamic linking.
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*/
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#include "prtypes.h"
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PR_BEGIN_EXTERN_C
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typedef struct PRLibrary PRLibrary;
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typedef struct PRStaticLinkTable {
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const char *name;
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void (*fp)();
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} PRStaticLinkTable;
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/*
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** Change the default library path to the given string. The string is
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** copied. This call will fail if it runs out of memory.
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**
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** The string provided as 'path' is copied. The caller can do whatever is
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** convenient with the argument when the function is complete.
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*/
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PR_EXTERN(PRStatus) PR_SetLibraryPath(const char *path);
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/*
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** Return a character string which contains the path used to search for
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** dynamically loadable libraries.
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**
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** The returned value is basically a copy of a PR_SetLibraryPath().
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** The storage is allocated by the runtime and becomes the responsibilty
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** of the caller.
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*/
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PR_EXTERN(char*) PR_GetLibraryPath(void);
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/*
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** Given a directory name "dir" and a library name "lib" construct a full
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** path name that will refer to the actual dynamically loaded
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** library. This does not test for existance of said file, it just
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** constructs the full filename. The name constructed is system dependent
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** and prepared for PR_LoadLibrary. The result must be free'd when the
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** caller is done with it.
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**
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** The storage for the result is allocated by the runtime and becomes the
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** responsibility of the caller.
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*/
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PR_EXTERN(char*) PR_GetLibraryName(const char *dir, const char *lib);
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/*
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**
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** Free the memory allocated, for the caller, by PR_GetLibraryName
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*/
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PR_EXTERN(void) PR_FreeLibraryName(char *mem);
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/*
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** Given a library "name" try to load the library. The argument "name"
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** is a machine-dependent name for the library, such as the full pathname
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** returned by PR_GetLibraryName. If the library is already loaded,
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** this function will avoid loading the library twice.
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**
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** If the library is loaded successfully, then a pointer to the PRLibrary
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** structure representing the library is returned. Otherwise, NULL is
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** returned.
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**
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** This increments the reference count of the library.
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*/
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PR_EXTERN(PRLibrary*) PR_LoadLibrary(const char *name);
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/*
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** Unload a previously loaded library. If the library was a static
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** library then the static link table will no longer be referenced. The
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** associated PRLibrary object is freed.
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**
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** PR_FAILURE is returned if the library cannot be unloaded.
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**
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** This function decrements the reference count of the library.
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*/
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PR_EXTERN(PRStatus) PR_UnloadLibrary(PRLibrary *lib);
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/*
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** Given the name of a procedure, return the address of the function that
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** implements the procedure, or NULL if no such function can be
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** found. This does not find symbols in the main program (the ".exe");
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** use PR_LoadStaticLibrary to register symbols in the main program. If
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** "lib" is NULL then all currently loaded libraries and the main program
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** are searched.
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**
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** This function does not modify the reference count of the library.
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*/
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PR_EXTERN(void*) PR_FindSymbol(PRLibrary *lib, const char *name);
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/*
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** Finds a symbol in one of the currently loaded libraries. Given the
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** name of a procedure, return the address of the function that
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** implements the procedure, and return the library that contains that
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** symbol, or NULL if no such function can be found. This does not find
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** symbols in the main program (the ".exe"); use PR_AddStaticLibrary to
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** register symbols in the main program.
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**
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** This increments the reference count of the library.
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*/
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PR_EXTERN(void*) PR_FindSymbolAndLibrary(const char *name,
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PRLibrary* *lib);
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/*
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** Register a static link table with the runtime under the name
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** "name". The symbols present in the static link table will be made
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** available to PR_FindSymbol. If "name" is null then the symbols will be
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** made available to the library which represents the executable. The
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** tables are not copied.
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**
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** Returns the library object if successful, null otherwise.
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**
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** This increments the reference count of the library.
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*/
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PR_EXTERN(PRLibrary*) PR_LoadStaticLibrary(
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const char *name, const PRStaticLinkTable *table);
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PR_END_EXTERN_C
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#endif /* prlink_h___ */
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