tclLoadNext.c
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上传日期:2015-12-11
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- /*
- * tclLoadNext.c --
- *
- * This procedure provides a version of the TclLoadFile that
- * works with NeXTs rld_* dynamic loading. This file provided
- * by Pedja Bogdanovich.
- *
- * Copyright (c) 1995-1997 Sun Microsystems, Inc.
- *
- * See the file "license.terms" for information on usage and redistribution
- * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
- *
- * RCS: @(#) $Id: tclLoadNext.c,v 1.11 2002/10/10 12:25:53 vincentdarley Exp $
- */
- #include "tclInt.h"
- #include <mach-o/rld.h>
- #include <streams/streams.h>
- /*
- *----------------------------------------------------------------------
- *
- * TclpDlopen --
- *
- * Dynamically loads a binary code file into memory and returns
- * a handle to the new code.
- *
- * Results:
- * A standard Tcl completion code. If an error occurs, an error
- * message is left in the interp's result.
- *
- * Side effects:
- * New code suddenly appears in memory.
- *
- *----------------------------------------------------------------------
- */
- int
- TclpDlopen(interp, pathPtr, loadHandle, unloadProcPtr)
- Tcl_Interp *interp; /* Used for error reporting. */
- Tcl_Obj *pathPtr; /* Name of the file containing the desired
- * code (UTF-8). */
- Tcl_LoadHandle *loadHandle; /* Filled with token for dynamically loaded
- * file which will be passed back to
- * (*unloadProcPtr)() to unload the file. */
- Tcl_FSUnloadFileProc **unloadProcPtr;
- /* Filled with address of Tcl_FSUnloadFileProc
- * function which should be used for
- * this file. */
- {
- struct mach_header *header;
- char *fileName;
- char *files[2];
- CONST char *native;
- int result = 1;
-
- NXStream *errorStream = NXOpenMemory(0,0,NX_READWRITE);
-
- fileName = Tcl_GetString(pathPtr);
- /*
- * First try the full path the user gave us. This is particularly
- * important if the cwd is inside a vfs, and we are trying to load
- * using a relative path.
- */
- native = Tcl_FSGetNativePath(pathPtr);
- files = {native,NULL};
- result = rld_load(errorStream, &header, files, NULL);
-
- if (!result) {
- /*
- * Let the OS loader examine the binary search path for
- * whatever string the user gave us which hopefully refers
- * to a file on the binary path
- */
- Tcl_DString ds;
- native = Tcl_UtfToExternalDString(NULL, fileName, -1, &ds);
- files = {native,NULL};
- result = rld_load(errorStream, &header, files, NULL);
- Tcl_DStringFree(&ds);
- }
-
- if (!result) {
- char *data;
- int len, maxlen;
- NXGetMemoryBuffer(errorStream,&data,&len,&maxlen);
- Tcl_AppendResult(interp, "couldn't load file "",
- fileName, "": ", data, NULL);
- NXCloseMemory(errorStream, NX_FREEBUFFER);
- return TCL_ERROR;
- }
- NXCloseMemory(errorStream, NX_FREEBUFFER);
-
- *loadHandle = (Tcl_LoadHandle)1; /* A dummy non-NULL value */
- *unloadProcPtr = &TclpUnloadFile;
-
- return TCL_OK;
- }
- /*
- *----------------------------------------------------------------------
- *
- * TclpFindSymbol --
- *
- * Looks up a symbol, by name, through a handle associated with
- * a previously loaded piece of code (shared library).
- *
- * Results:
- * Returns a pointer to the function associated with 'symbol' if
- * it is found. Otherwise returns NULL and may leave an error
- * message in the interp's result.
- *
- *----------------------------------------------------------------------
- */
- Tcl_PackageInitProc*
- TclpFindSymbol(interp, loadHandle, symbol)
- Tcl_Interp *interp;
- Tcl_LoadHandle loadHandle;
- CONST char *symbol;
- {
- Tcl_PackageInitProc *proc=NULL;
- if(symbol) {
- char sym[strlen(symbol)+2];
- sym[0]='_'; sym[1]=0; strcat(sym,symbol);
- rld_lookup(NULL,sym,(unsigned long *)&proc);
- }
- return proc;
- }
- /*
- *----------------------------------------------------------------------
- *
- * TclpUnloadFile --
- *
- * Unloads a dynamically loaded binary code file from memory.
- * Code pointers in the formerly loaded file are no longer valid
- * after calling this function.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Does nothing. Can anything be done?
- *
- *----------------------------------------------------------------------
- */
- void
- TclpUnloadFile(loadHandle)
- Tcl_LoadHandle loadHandle; /* loadHandle returned by a previous call
- * to TclpDlopen(). The loadHandle is
- * a token that represents the loaded
- * file. */
- {
- }
- /*
- *----------------------------------------------------------------------
- *
- * TclGuessPackageName --
- *
- * If the "load" command is invoked without providing a package
- * name, this procedure is invoked to try to figure it out.
- *
- * Results:
- * Always returns 0 to indicate that we couldn't figure out a
- * package name; generic code will then try to guess the package
- * from the file name. A return value of 1 would have meant that
- * we figured out the package name and put it in bufPtr.
- *
- * Side effects:
- * None.
- *
- *----------------------------------------------------------------------
- */
- int
- TclGuessPackageName(fileName, bufPtr)
- CONST char *fileName; /* Name of file containing package (already
- * translated to local form if needed). */
- Tcl_DString *bufPtr; /* Initialized empty dstring. Append
- * package name to this if possible. */
- {
- return 0;
- }