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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 1.15 2010/03/11 13:35:25 nijtmans 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(
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(
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(
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(
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;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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