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/*
* tclLoadDld.c --
*
* This procedure provides a version of the TclLoadFile that
* works with the "dld_link" and "dld_get_func" library procedures
* for dynamic loading. It has been tested on Linux 1.1.95 and
* dld-3.2.7. This file probably isn't needed anymore, since it
* makes more sense to use "dl_open" etc.
*
* 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: tclLoadDld.c,v 1.6 2001/09/28 01:21:53 dgp Exp $
*/
#include "tclInt.h"
#include "dld.h"
/*
* In some systems, like SunOS 4.1.3, the RTLD_NOW flag isn't defined
* and this argument to dlopen must always be 1.
*/
#ifndef RTLD_NOW
# define RTLD_NOW 1
#endif
/*
*----------------------------------------------------------------------
*
* TclpLoadFile --
*
* Dynamically loads a binary code file into memory and returns
* the addresses of two procedures within that file, if they
* are defined.
*
* Results:
* A standard Tcl completion code. If an error occurs, an error
* message is left in the interp's result. *proc1Ptr and *proc2Ptr
* are filled in with the addresses of the symbols given by
* *sym1 and *sym2, or NULL if those symbols can't be found.
*
* Side effects:
* New code suddenly appears in memory.
*
*----------------------------------------------------------------------
*/
int
TclpLoadFile(interp, pathPtr, sym1, sym2, proc1Ptr, proc2Ptr,
clientDataPtr, unloadProcPtr)
Tcl_Interp *interp; /* Used for error reporting. */
Tcl_Obj *pathPtr; /* Name of the file containing the desired
* code. */
CONST char *sym1, *sym2; /* Names of two procedures to look up in
* the file's symbol table. */
Tcl_PackageInitProc **proc1Ptr, **proc2Ptr;
/* Where to return the addresses corresponding
* to sym1 and sym2. */
ClientData *clientDataPtr; /* 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. */
{
static int firstTime = 1;
int returnCode;
char *fileName = Tcl_GetString(pathPtr);
/*
* The dld package needs to know the pathname to the tcl binary.
* If that's not know, return an error.
*/
if (firstTime) {
if (tclExecutableName == NULL) {
Tcl_SetResult(interp,
"don't know name of application binary file, so can't initialize dynamic loader",
TCL_STATIC);
return TCL_ERROR;
}
returnCode = dld_init(tclExecutableName);
if (returnCode != 0) {
Tcl_AppendResult(interp,
"initialization failed for dynamic loader: ",
dld_strerror(returnCode), (char *) NULL);
return TCL_ERROR;
}
firstTime = 0;
}
if ((returnCode = dld_link(Tcl_GetString(pathPtr)) != 0) {
Tcl_AppendResult(interp, "couldn't load file \"",
Tcl_GetString(pathPtr),
"\": ", dld_strerror(returnCode), (char *) NULL);
return TCL_ERROR;
}
*proc1Ptr = (Tcl_PackageInitProc *) dld_get_func(sym1);
*proc2Ptr = (Tcl_PackageInitProc *) dld_get_func(sym2);
*clientDataPtr = strcpy(
(char *) ckalloc((unsigned) (strlen(fileName) + 1)), fileName);
*unloadProcPtr = &TclpUnloadFile;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* 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:
* Code removed from memory.
*
*----------------------------------------------------------------------
*/
void
TclpUnloadFile(clientData)
ClientData clientData; /* ClientData returned by a previous call
* to TclpLoadFile(). The clientData is
* a token that represents the loaded
* file. */
{
char *fileName;
handle = (char *) clientData;
dld_unlink_by_file(handle, 0);
ckfree(handle);
}
/*
*----------------------------------------------------------------------
*
* 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)
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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