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/*
* tclLoadOSF.c --
*
* This function provides a version of the TclLoadFile that works under
* OSF/1 1.0/1.1/1.2 and related systems, utilizing the old OSF/1
* /sbin/loader and /usr/include/loader.h. OSF/1 versions from 1.3 and on
* use ELF, rtld, and dlopen()[/usr/include/ldfcn.h].
*
* This is useful for:
* OSF/1 1.0, 1.1, 1.2 (from OSF)
* includes: MK4 and AD1 (from OSF RI)
* OSF/1 1.3 (from OSF) using ROSE
* HP OSF/1 1.0 ("Acorn") using COFF
*
* This is likely to be useful for:
* Paragon OSF/1 (from Intel)
* HI-OSF/1 (from Hitachi)
*
* This is NOT to be used on:
* Digitial Alpha OSF/1 systems
* OSF/1 1.3 or later (from OSF) using ELF
* includes: MK6, MK7, AD2, AD3 (from OSF RI)
*
* This approach to things was utter @&^#; thankfully, OSF/1 eventually
* supported dlopen().
*
* John Robert LoVerso <loverso@freebsd.osf.org>
*
* 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 <sys/types.h>
#include <loader.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)
{
Tcl_LoadHandle newHandle;
ldr_module_t lm;
char *pkg;
char *fileName = TclGetString(pathPtr);
const char *native;
/*
* 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);
lm = (Tcl_PackageInitProc *) load(native, LDR_NOFLAGS);
if (lm == LDR_NULL_MODULE) {
/*
* 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);
lm = (Tcl_PackageInitProc *) load(native, LDR_NOFLAGS);
Tcl_DStringFree(&ds);
}
if (lm == LDR_NULL_MODULE) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"couldn't load file \"%s\": %s",
fileName, Tcl_PosixError(interp)));
return TCL_ERROR;
}
*clientDataPtr = NULL;
/*
* My convention is to use a [OSF loader] package name the same as shlib,
* since the idiots never implemented ldr_lookup() and it is otherwise
* impossible to get a package name given a module.
*
* I build loadable modules with a makefile rule like
* ld ... -export $@: -o $@ $(OBJS)
*/
if ((pkg = strrchr(fileName, '/')) == NULL) {
pkg = fileName;
} else {
pkg++;
}
newHandle = (Tcl_LoadHandle)Tcl_Alloc(sizeof(*newHandle));
newHandle->clientData = pkg;
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)
{
void *retval = ldr_lookup_package((char *) loadHandle, symbol);
if (retval == NULL && interp != NULL) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"cannot find symbol \"%s\"", symbol));
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "LOAD_SYMBOL", symbol, NULL);
}
return retval;
}
/*
*----------------------------------------------------------------------
*
* 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?
*
*----------------------------------------------------------------------
*/
static void
UnloadFile(
Tcl_LoadHandle loadHandle) /* loadHandle returned by a previous call to
* TclpDlopen(). The loadHandle is a token
* that represents the loaded file. */
{
Tcl_Free(loadHandle);
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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