зеркало из https://github.com/mozilla/pjs.git
261 строка
9.5 KiB
C
261 строка
9.5 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* ***** BEGIN LICENSE BLOCK *****
|
|
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
|
*
|
|
* The contents of this file are subject to the Mozilla Public License Version
|
|
* 1.1 (the "License"); you may not use this file except in compliance with
|
|
* the License. You may obtain a copy of the License at
|
|
* http://www.mozilla.org/MPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
|
* for the specific language governing rights and limitations under the
|
|
* License.
|
|
*
|
|
* The Original Code is the Netscape Portable Runtime (NSPR).
|
|
*
|
|
* The Initial Developer of the Original Code is
|
|
* Netscape Communications Corporation.
|
|
* Portions created by the Initial Developer are Copyright (C) 1998-2000
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either the GNU General Public License Version 2 or later (the "GPL"), or
|
|
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
|
* in which case the provisions of the GPL or the LGPL are applicable instead
|
|
* of those above. If you wish to allow use of your version of this file only
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
|
* use your version of this file under the terms of the MPL, indicate your
|
|
* decision by deleting the provisions above and replace them with the notice
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
|
* the provisions above, a recipient may use your version of this file under
|
|
* the terms of any one of the MPL, the GPL or the LGPL.
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
|
|
#ifndef prlink_h___
|
|
#define prlink_h___
|
|
|
|
/*
|
|
** API to static and dynamic linking.
|
|
*/
|
|
#include "prtypes.h"
|
|
|
|
PR_BEGIN_EXTERN_C
|
|
|
|
typedef struct PRLibrary PRLibrary;
|
|
|
|
typedef struct PRStaticLinkTable {
|
|
const char *name;
|
|
void (*fp)();
|
|
} PRStaticLinkTable;
|
|
|
|
/*
|
|
** Change the default library path to the given string. The string is
|
|
** copied. This call will fail if it runs out of memory.
|
|
**
|
|
** The string provided as 'path' is copied. The caller can do whatever is
|
|
** convenient with the argument when the function is complete.
|
|
*/
|
|
NSPR_API(PRStatus) PR_SetLibraryPath(const char *path);
|
|
|
|
/*
|
|
** Return a character string which contains the path used to search for
|
|
** dynamically loadable libraries.
|
|
**
|
|
** The returned value is basically a copy of a PR_SetLibraryPath().
|
|
** The storage is allocated by the runtime and becomes the responsibilty
|
|
** of the caller.
|
|
*/
|
|
NSPR_API(char*) PR_GetLibraryPath(void);
|
|
|
|
/*
|
|
** Given a directory name "dir" and a library name "lib" construct a full
|
|
** path name that will refer to the actual dynamically loaded
|
|
** library. This does not test for existance of said file, it just
|
|
** constructs the full filename. The name constructed is system dependent
|
|
** and prepared for PR_LoadLibrary. The result must be free'd when the
|
|
** caller is done with it.
|
|
**
|
|
** The storage for the result is allocated by the runtime and becomes the
|
|
** responsibility of the caller.
|
|
*/
|
|
NSPR_API(char*) PR_GetLibraryName(const char *dir, const char *lib);
|
|
|
|
/*
|
|
**
|
|
** Free the memory allocated, for the caller, by PR_GetLibraryName
|
|
*/
|
|
NSPR_API(void) PR_FreeLibraryName(char *mem);
|
|
|
|
/*
|
|
** Given a library "name" try to load the library. The argument "name"
|
|
** is a machine-dependent name for the library, such as the full pathname
|
|
** returned by PR_GetLibraryName. If the library is already loaded,
|
|
** this function will avoid loading the library twice.
|
|
**
|
|
** If the library is loaded successfully, then a pointer to the PRLibrary
|
|
** structure representing the library is returned. Otherwise, NULL is
|
|
** returned.
|
|
**
|
|
** This increments the reference count of the library.
|
|
*/
|
|
NSPR_API(PRLibrary*) PR_LoadLibrary(const char *name);
|
|
|
|
/*
|
|
** Each operating system has its preferred way of specifying
|
|
** a file in the file system. Most operating systems use
|
|
** a pathname. Mac OS, on the other hand, uses the FSSpec
|
|
** structure to specify a file. PRLibSpec allows NSPR clients
|
|
** to use the type of file specification that is most efficient
|
|
** for a particular platform.
|
|
**
|
|
** On some operating systems such as Mac OS, a shared library may
|
|
** contain code fragments that can be individually loaded.
|
|
** PRLibSpec also allows NSPR clients to identify a code fragment
|
|
** in a library, if code fragments are supported by the OS.
|
|
** A code fragment can be specified by name or by an integer index.
|
|
**
|
|
** Right now PRLibSpec supports four types of library specification:
|
|
** a pathname in the native character encoding, a Mac code fragment
|
|
** by name, a Mac code fragment by index, and a UTF-16 pathname.
|
|
*/
|
|
|
|
typedef enum PRLibSpecType {
|
|
PR_LibSpec_Pathname,
|
|
PR_LibSpec_MacNamedFragment, /* obsolete (for Mac OS Classic) */
|
|
PR_LibSpec_MacIndexedFragment, /* obsolete (for Mac OS Classic) */
|
|
PR_LibSpec_PathnameU /* supported only on Win32 */
|
|
} PRLibSpecType;
|
|
|
|
struct FSSpec; /* Mac OS FSSpec */
|
|
|
|
typedef struct PRLibSpec {
|
|
PRLibSpecType type;
|
|
union {
|
|
/* if type is PR_LibSpec_Pathname */
|
|
const char *pathname;
|
|
|
|
/* if type is PR_LibSpec_MacNamedFragment */
|
|
struct {
|
|
const struct FSSpec *fsspec;
|
|
const char *name;
|
|
} mac_named_fragment; /* obsolete (for Mac OS Classic) */
|
|
|
|
/* if type is PR_LibSpec_MacIndexedFragment */
|
|
struct {
|
|
const struct FSSpec *fsspec;
|
|
PRUint32 index;
|
|
} mac_indexed_fragment; /* obsolete (for Mac OS Classic) */
|
|
|
|
/* if type is PR_LibSpec_PathnameU */
|
|
const PRUnichar *pathname_u; /* supported only on Win32 */
|
|
} value;
|
|
} PRLibSpec;
|
|
|
|
/*
|
|
** The following bit flags may be or'd together and passed
|
|
** as the 'flags' argument to PR_LoadLibraryWithFlags.
|
|
** Flags not supported by the underlying OS are ignored.
|
|
*/
|
|
|
|
#define PR_LD_LAZY 0x1 /* equivalent to RTLD_LAZY on Unix */
|
|
#define PR_LD_NOW 0x2 /* equivalent to RTLD_NOW on Unix */
|
|
#define PR_LD_GLOBAL 0x4 /* equivalent to RTLD_GLOBAL on Unix */
|
|
#define PR_LD_LOCAL 0x8 /* equivalent to RTLD_LOCAL on Unix */
|
|
/* 0x8000 reserved for NSPR internal use */
|
|
|
|
/*
|
|
** Load the specified library, in the manner specified by 'flags'.
|
|
*/
|
|
|
|
NSPR_API(PRLibrary *)
|
|
PR_LoadLibraryWithFlags(
|
|
PRLibSpec libSpec, /* the shared library */
|
|
PRIntn flags /* flags that affect the loading */
|
|
);
|
|
|
|
/*
|
|
** Unload a previously loaded library. If the library was a static
|
|
** library then the static link table will no longer be referenced. The
|
|
** associated PRLibrary object is freed.
|
|
**
|
|
** PR_FAILURE is returned if the library cannot be unloaded.
|
|
**
|
|
** This function decrements the reference count of the library.
|
|
*/
|
|
NSPR_API(PRStatus) PR_UnloadLibrary(PRLibrary *lib);
|
|
|
|
/*
|
|
** Given the name of a procedure, return the address of the function that
|
|
** implements the procedure, or NULL if no such function can be
|
|
** found. This does not find symbols in the main program (the ".exe");
|
|
** use PR_LoadStaticLibrary to register symbols in the main program.
|
|
**
|
|
** This function does not modify the reference count of the library.
|
|
*/
|
|
NSPR_API(void*) PR_FindSymbol(PRLibrary *lib, const char *name);
|
|
|
|
/*
|
|
** Similar to PR_FindSymbol, except that the return value is a pointer to
|
|
** a function, and not a pointer to void. Casting between a data pointer
|
|
** and a function pointer is not portable according to the C standard.
|
|
** Any function pointer can be cast to any other function pointer.
|
|
**
|
|
** This function does not modify the reference count of the library.
|
|
*/
|
|
typedef void (*PRFuncPtr)();
|
|
NSPR_API(PRFuncPtr) PR_FindFunctionSymbol(PRLibrary *lib, const char *name);
|
|
|
|
/*
|
|
** Finds a symbol in one of the currently loaded libraries. Given the
|
|
** name of a procedure, return the address of the function that
|
|
** implements the procedure, and return the library that contains that
|
|
** symbol, or NULL if no such function can be found. This does not find
|
|
** symbols in the main program (the ".exe"); use PR_AddStaticLibrary to
|
|
** register symbols in the main program.
|
|
**
|
|
** This increments the reference count of the library.
|
|
*/
|
|
NSPR_API(void*) PR_FindSymbolAndLibrary(const char *name,
|
|
PRLibrary* *lib);
|
|
|
|
/*
|
|
** Similar to PR_FindSymbolAndLibrary, except that the return value is
|
|
** a pointer to a function, and not a pointer to void. Casting between a
|
|
** data pointer and a function pointer is not portable according to the C
|
|
** standard. Any function pointer can be cast to any other function pointer.
|
|
**
|
|
** This increments the reference count of the library.
|
|
*/
|
|
NSPR_API(PRFuncPtr) PR_FindFunctionSymbolAndLibrary(const char *name,
|
|
PRLibrary* *lib);
|
|
|
|
/*
|
|
** Register a static link table with the runtime under the name
|
|
** "name". The symbols present in the static link table will be made
|
|
** available to PR_FindSymbol. If "name" is null then the symbols will be
|
|
** made available to the library which represents the executable. The
|
|
** tables are not copied.
|
|
**
|
|
** Returns the library object if successful, null otherwise.
|
|
**
|
|
** This increments the reference count of the library.
|
|
*/
|
|
NSPR_API(PRLibrary*) PR_LoadStaticLibrary(
|
|
const char *name, const PRStaticLinkTable *table);
|
|
|
|
/*
|
|
** Return the pathname of the file that the library "name" was loaded
|
|
** from. "addr" is the address of a function defined in the library.
|
|
**
|
|
** The caller is responsible for freeing the result with PR_Free.
|
|
*/
|
|
NSPR_API(char *) PR_GetLibraryFilePathname(const char *name, PRFuncPtr addr);
|
|
|
|
PR_END_EXTERN_C
|
|
|
|
#endif /* prlink_h___ */
|