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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 © 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.
*/
#include "tclInt.h"
#include <mach-o/rld.h>
#include <streams/streams.h>
/* Static procedures defined within this file */
static void * FindSymbol(Tcl_Interp *interp,
Tcl_LoadHandle loadHandle, const char* symbol);
static void UnloadFile(Tcl_LoadHandle loadHandle);
/*
*----------------------------------------------------------------------
*
* 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. */
int flags)
{
Tcl_LoadHandle newHandle;
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, TCL_INDEX_NONE, &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_SetObjResult(interp, Tcl_ObjPrintf(
"couldn't load file \"%s\": %s", fileName, data));
NXCloseMemory(errorStream, NX_FREEBUFFER);
return TCL_ERROR;
}
NXCloseMemory(errorStream, NX_FREEBUFFER);
newHandle = (Tcl_LoadHandle) ckalloc(sizeof(*newHandle));
newHandle->clientData = INT2PTR(1);
newHandle->findSymbolProcPtr = &FindSymbol;
newHandle->unloadFileProcPtr = &UnloadFile;
*loadHandle = newHandle;
*unloadProcPtr = &UnloadFile;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* FindSymbol --
*
* 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.
*
*----------------------------------------------------------------------
*/
static void *
FindSymbol(
Tcl_Interp *interp,
Tcl_LoadHandle loadHandle,
const char *symbol)
{
Tcl_LibraryInitProc *proc = NULL;
if (symbol) {
char sym[strlen(symbol) + 2];
sym[0] = '_';
sym[1] = 0;
strcat(sym, symbol);
rld_lookup(NULL, sym, (unsigned long *) &proc);
}
if (proc == NULL && interp != NULL) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"cannot find symbol \"%s\"", symbol));
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "LOAD_SYMBOL", symbol, NULL);
}
return proc;
}
/*
*----------------------------------------------------------------------
*
* UnloadFile --
*
* 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
UnloadFile(
Tcl_LoadHandle loadHandle) /* loadHandle returned by a previous call to
* TclpDlopen(). The loadHandle is a token
* that represents the loaded file. */
{
ckfree(loadHandle);
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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