--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nspr/pr/include/prlink.h	Mon Jul 28 10:47:06 2014 +0200
@@ -0,0 +1,230 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#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)(void);
+} 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 Classic, 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 Classic, 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 Classic 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 */
+/* The following is equivalent to LOAD_WITH_ALTERED_SEARCH_PATH on Windows */
+#define PR_LD_ALT_SEARCH_PATH  0x10  
+/*                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)(void);
+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___ */