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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 1.11 2002/07/18 15:04:54 vincentdarley Exp $
*/
#include <dl.h>
/*
* On some HP machines, dl.h defines EXTERN; remove that definition.
*/
#ifdef EXTERN
# undef EXTERN
#endif
#include "tclInt.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). */
TclLoadHandle *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. */
{
shl_t handle;
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;
}
*loadHandle = (TclLoadHandle) handle;
*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;
TclLoadHandle loadHandle;
CONST char *symbol;
{
Tcl_DString newName;
Tcl_PackageInitProc *proc=NULL;
shl_t handle = (shl_t)loadHandle;
/*
* 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, symbol, (short) TYPE_PROCEDURE, (void *) &proc)
!= 0) {
Tcl_DStringInit(&newName);
Tcl_DStringAppend(&newName, "_", 1);
Tcl_DStringAppend(&newName, symbol, -1);
if (shl_findsym(&handle, Tcl_DStringValue(&newName),
(short) TYPE_PROCEDURE, (void *) &proc) != 0) {
proc = NULL;
}
Tcl_DStringFree(&newName);
}
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:
* Code removed from memory.
*
*----------------------------------------------------------------------
*/
void
TclpUnloadFile(loadHandle)
TclLoadHandle loadHandle; /* loadHandle returned by a previous call
* to TclpDlopen(). The loadHandle is
* a token that represents the loaded
* file. */
{
shl_t handle;
handle = (shl_t) loadHandle;
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)
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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