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231 lines
8.1 KiB
C
231 lines
8.1 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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)(void);
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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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NSPR_API(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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NSPR_API(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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NSPR_API(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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NSPR_API(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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NSPR_API(PRLibrary*) PR_LoadLibrary(const char *name);
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/*
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** Each operating system has its preferred way of specifying
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** a file in the file system. Most operating systems use
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** a pathname. Mac OS Classic, on the other hand, uses the FSSpec
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** structure to specify a file. PRLibSpec allows NSPR clients
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** to use the type of file specification that is most efficient
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** for a particular platform.
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**
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** On some operating systems such as Mac OS Classic, a shared library
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** may contain code fragments that can be individually loaded.
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** PRLibSpec also allows NSPR clients to identify a code fragment
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** in a library, if code fragments are supported by the OS.
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** A code fragment can be specified by name or by an integer index.
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**
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** Right now PRLibSpec supports four types of library specification:
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** a pathname in the native character encoding, a Mac code fragment
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** by name, a Mac code fragment by index, and a UTF-16 pathname.
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*/
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typedef enum PRLibSpecType {
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PR_LibSpec_Pathname,
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PR_LibSpec_MacNamedFragment, /* obsolete (for Mac OS Classic) */
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PR_LibSpec_MacIndexedFragment, /* obsolete (for Mac OS Classic) */
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PR_LibSpec_PathnameU /* supported only on Win32 */
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} PRLibSpecType;
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struct FSSpec; /* Mac OS Classic FSSpec */
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typedef struct PRLibSpec {
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PRLibSpecType type;
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union {
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/* if type is PR_LibSpec_Pathname */
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const char *pathname;
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/* if type is PR_LibSpec_MacNamedFragment */
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struct {
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const struct FSSpec *fsspec;
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const char *name;
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} mac_named_fragment; /* obsolete (for Mac OS Classic) */
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/* if type is PR_LibSpec_MacIndexedFragment */
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struct {
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const struct FSSpec *fsspec;
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PRUint32 index;
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} mac_indexed_fragment; /* obsolete (for Mac OS Classic) */
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/* if type is PR_LibSpec_PathnameU */
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const PRUnichar *pathname_u; /* supported only on Win32 */
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} value;
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} PRLibSpec;
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/*
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** The following bit flags may be or'd together and passed
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** as the 'flags' argument to PR_LoadLibraryWithFlags.
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** Flags not supported by the underlying OS are ignored.
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*/
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#define PR_LD_LAZY 0x1 /* equivalent to RTLD_LAZY on Unix */
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#define PR_LD_NOW 0x2 /* equivalent to RTLD_NOW on Unix */
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#define PR_LD_GLOBAL 0x4 /* equivalent to RTLD_GLOBAL on Unix */
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#define PR_LD_LOCAL 0x8 /* equivalent to RTLD_LOCAL on Unix */
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/* The following is equivalent to LOAD_WITH_ALTERED_SEARCH_PATH on Windows */
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#define PR_LD_ALT_SEARCH_PATH 0x10
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/* 0x8000 reserved for NSPR internal use */
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/*
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** Load the specified library, in the manner specified by 'flags'.
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*/
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NSPR_API(PRLibrary *)
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PR_LoadLibraryWithFlags(
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PRLibSpec libSpec, /* the shared library */
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PRIntn flags /* flags that affect the loading */
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);
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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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NSPR_API(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.
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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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NSPR_API(void*) PR_FindSymbol(PRLibrary *lib, const char *name);
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/*
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** Similar to PR_FindSymbol, except that the return value is a pointer to
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** a function, and not a pointer to void. Casting between a data pointer
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** and a function pointer is not portable according to the C standard.
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** Any function pointer can be cast to any other function pointer.
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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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typedef void (*PRFuncPtr)(void);
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NSPR_API(PRFuncPtr) PR_FindFunctionSymbol(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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NSPR_API(void*) PR_FindSymbolAndLibrary(const char *name,
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PRLibrary* *lib);
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/*
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** Similar to PR_FindSymbolAndLibrary, except that the return value is
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** a pointer to a function, and not a pointer to void. Casting between a
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** data pointer and a function pointer is not portable according to the C
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** standard. Any function pointer can be cast to any other function pointer.
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**
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** This increments the reference count of the library.
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*/
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NSPR_API(PRFuncPtr) PR_FindFunctionSymbolAndLibrary(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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NSPR_API(PRLibrary*) PR_LoadStaticLibrary(
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const char *name, const PRStaticLinkTable *table);
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/*
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** Return the pathname of the file that the library "name" was loaded
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** from. "addr" is the address of a function defined in the library.
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**
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** The caller is responsible for freeing the result with PR_Free.
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*/
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NSPR_API(char *) PR_GetLibraryFilePathname(const char *name, PRFuncPtr addr);
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PR_END_EXTERN_C
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#endif /* prlink_h___ */
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