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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;
}
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