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/*
* tclLoadShl.c --
*
* This procedure provides a version of the TclLoadFile that works
* with the "shl_load" and "shl_findsym" library procedures for
* dynamic loading (e.g. for HP machines).
*
* 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: tclLoadShl.c,v 1.6 2001/09/04 18:06:34 vincentdarley Exp $
*/
#include <dl.h>
/*
* On some HP machines, dl.h defines EXTERN; remove that definition.
*/
#ifdef EXTERN
# undef EXTERN
#endif
#include "tcl.h"
/*
*----------------------------------------------------------------------
*
* 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. */
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. */
{
shl_t handle;
Tcl_DString newName;
char *fileName = Tcl_GetString(pathPtr);
/*
* The flags below used to be BIND_IMMEDIATE; they were changed at
* the suggestion of Wolfgang Kechel (wolfgang@prs.de): "This
* enables verbosity for missing symbols when loading a shared lib
* and allows to load libtk8.0.sl into tclsh8.0 without problems.
* In general, this delays resolving symbols until they are actually
* needed. Shared libs do no longer need all libraries linked in
* when they are build."
*/
handle = shl_load(fileName,
BIND_DEFERRED|BIND_VERBOSE|DYNAMIC_PATH,
0L);
if (handle == NULL) {
Tcl_AppendResult(interp, "couldn't load file \"", fileName,
"\": ", Tcl_PosixError(interp), (char *) NULL);
return TCL_ERROR;
}
*clientDataPtr = (ClientData) handle;
/*
* Some versions of the HP system software still use "_" at the
* beginning of exported symbols while others don't; try both
* forms of each name.
*/
if (shl_findsym(&handle, sym1, (short) TYPE_PROCEDURE, (void *) proc1Ptr)
!= 0) {
Tcl_DStringInit(&newName);
Tcl_DStringAppend(&newName, "_", 1);
Tcl_DStringAppend(&newName, sym1, -1);
if (shl_findsym(&handle, Tcl_DStringValue(&newName),
(short) TYPE_PROCEDURE, (void *) proc1Ptr) != 0) {
*proc1Ptr = NULL;
}
Tcl_DStringFree(&newName);
}
if (shl_findsym(&handle, sym2, (short) TYPE_PROCEDURE, (void *) proc2Ptr)
!= 0) {
Tcl_DStringInit(&newName);
Tcl_DStringAppend(&newName, "_", 1);
Tcl_DStringAppend(&newName, sym2, -1);
if (shl_findsym(&handle, Tcl_DStringValue(&newName),
(short) TYPE_PROCEDURE, (void *) proc2Ptr) != 0) {
*proc2Ptr = NULL;
}
Tcl_DStringFree(&newName);
}
*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. */
{
shl_t handle;
handle = (shl_t) clientData;
shl_unload(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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