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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 © 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 <dl.h>
#include "tclInt.h"
/*
* Static functions defined within this file.
*/
static void * FindSymbol(Tcl_Interp *interp,
Tcl_LoadHandle loadHandle, const char *symbol);
static void UnloadFile(Tcl_LoadHandle handle);
/*
*----------------------------------------------------------------------
*
* 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)
{
shl_t handle;
Tcl_LoadHandle newHandle;
const char *native;
char *fileName = TclGetString(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."
*/
/*
* 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);
handle = shl_load(native, BIND_DEFERRED|BIND_VERBOSE, 0L);
if (handle == NULL) {
/*
* 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);
handle = shl_load(native, BIND_DEFERRED|BIND_VERBOSE|DYNAMIC_PATH, 0L);
Tcl_DStringFree(&ds);
}
if (handle == NULL) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"couldn't load file \"%s\": %s",
fileName, Tcl_PosixError(interp)));
return TCL_ERROR;
}
newHandle = (Tcl_LoadHandle)Tcl_Alloc(sizeof(*newHandle));
newHandle->clientData = handle;
newHandle->findSymbolProcPtr = &FindSymbol;
newHandle->unloadFileProcPtr = *unloadProcPtr = &UnloadFile;
*loadHandle = newHandle;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_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_DString newName;
Tcl_PackageInitProc *proc = NULL;
shl_t handle = (shl_t) loadHandle->clientData;
/*
* 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);
TclDStringAppendLiteral(&newName, "_");
Tcl_DStringAppend(&newName, symbol, -1);
if (shl_findsym(&handle, Tcl_DStringValue(&newName),
(short) TYPE_PROCEDURE, (void *) &proc) != 0) {
proc = NULL;
}
Tcl_DStringFree(&newName);
}
if (proc == NULL && interp != NULL) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"cannot find symbol \"%s\": %s",
symbol, Tcl_PosixError(interp)));
}
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:
* Code removed from memory.
*
*----------------------------------------------------------------------
*/
static void
UnloadFile(
Tcl_LoadHandle loadHandle) /* loadHandle returned by a previous call to
* TclpDlopen(). The loadHandle is a token
* that represents the loaded file. */
{
shl_t handle = (shl_t) loadHandle->clientData;
shl_unload(handle);
Tcl_Free(loadHandle);
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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