sl@0: /* sl@0: * tclLoadDld.c -- sl@0: * sl@0: * This procedure provides a version of the TclLoadFile that sl@0: * works with the "dld_link" and "dld_get_func" library procedures sl@0: * for dynamic loading. It has been tested on Linux 1.1.95 and sl@0: * dld-3.2.7. This file probably isn't needed anymore, since it sl@0: * makes more sense to use "dl_open" etc. sl@0: * sl@0: * Copyright (c) 1995-1997 Sun Microsystems, Inc. sl@0: * sl@0: * See the file "license.terms" for information on usage and redistribution sl@0: * of this file, and for a DISCLAIMER OF ALL WARRANTIES. sl@0: * sl@0: * RCS: @(#) $Id: tclLoadDld.c,v 1.12 2002/10/10 12:25:53 vincentdarley Exp $ sl@0: */ sl@0: sl@0: #include "tclInt.h" sl@0: #include "dld.h" sl@0: sl@0: /* sl@0: * In some systems, like SunOS 4.1.3, the RTLD_NOW flag isn't defined sl@0: * and this argument to dlopen must always be 1. sl@0: */ sl@0: sl@0: #ifndef RTLD_NOW sl@0: # define RTLD_NOW 1 sl@0: #endif sl@0: sl@0: /* sl@0: *---------------------------------------------------------------------- sl@0: * sl@0: * TclpDlopen -- sl@0: * sl@0: * Dynamically loads a binary code file into memory and returns sl@0: * a handle to the new code. sl@0: * sl@0: * Results: sl@0: * A standard Tcl completion code. If an error occurs, an error sl@0: * message is left in the interp's result. sl@0: * sl@0: * Side effects: sl@0: * New code suddenly appears in memory. sl@0: * sl@0: *---------------------------------------------------------------------- sl@0: */ sl@0: sl@0: int sl@0: TclpDlopen(interp, pathPtr, loadHandle, unloadProcPtr) sl@0: Tcl_Interp *interp; /* Used for error reporting. */ sl@0: Tcl_Obj *pathPtr; /* Name of the file containing the desired sl@0: * code (UTF-8). */ sl@0: Tcl_LoadHandle *loadHandle; /* Filled with token for dynamically loaded sl@0: * file which will be passed back to sl@0: * (*unloadProcPtr)() to unload the file. */ sl@0: Tcl_FSUnloadFileProc **unloadProcPtr; sl@0: /* Filled with address of Tcl_FSUnloadFileProc sl@0: * function which should be used for sl@0: * this file. */ sl@0: { sl@0: static int firstTime = 1; sl@0: int returnCode; sl@0: char *fileName; sl@0: CONST char *native; sl@0: sl@0: /* sl@0: * The dld package needs to know the pathname to the tcl binary. sl@0: * If that's not known, return an error. sl@0: */ sl@0: sl@0: if (firstTime) { sl@0: if (tclExecutableName == NULL) { sl@0: Tcl_SetResult(interp, sl@0: "don't know name of application binary file, so can't initialize dynamic loader", sl@0: TCL_STATIC); sl@0: return TCL_ERROR; sl@0: } sl@0: returnCode = dld_init(tclExecutableName); sl@0: if (returnCode != 0) { sl@0: Tcl_AppendResult(interp, sl@0: "initialization failed for dynamic loader: ", sl@0: dld_strerror(returnCode), (char *) NULL); sl@0: return TCL_ERROR; sl@0: } sl@0: firstTime = 0; sl@0: } sl@0: sl@0: fileName = Tcl_GetString(pathPtr); sl@0: sl@0: /* sl@0: * First try the full path the user gave us. This is particularly sl@0: * important if the cwd is inside a vfs, and we are trying to load sl@0: * using a relative path. sl@0: */ sl@0: native = Tcl_FSGetNativePath(pathPtr); sl@0: returnCode = dld_link(native); sl@0: sl@0: if (returnCode != 0) { sl@0: Tcl_DString ds; sl@0: native = Tcl_UtfToExternalDString(NULL, fileName, -1, &ds); sl@0: returnCode = dld_link(native); sl@0: Tcl_DStringFree(&ds); sl@0: } sl@0: sl@0: if (returnCode != 0) { sl@0: Tcl_AppendResult(interp, "couldn't load file \"", sl@0: fileName, "\": ", sl@0: dld_strerror(returnCode), (char *) NULL); sl@0: return TCL_ERROR; sl@0: } sl@0: *loadHandle = (Tcl_LoadHandle) strcpy( sl@0: (char *) ckalloc((unsigned) (strlen(fileName) + 1)), fileName); sl@0: *unloadProcPtr = &TclpUnloadFile; sl@0: return TCL_OK; sl@0: } sl@0: sl@0: /* sl@0: *---------------------------------------------------------------------- sl@0: * sl@0: * TclpFindSymbol -- sl@0: * sl@0: * Looks up a symbol, by name, through a handle associated with sl@0: * a previously loaded piece of code (shared library). sl@0: * sl@0: * Results: sl@0: * Returns a pointer to the function associated with 'symbol' if sl@0: * it is found. Otherwise returns NULL and may leave an error sl@0: * message in the interp's result. sl@0: * sl@0: *---------------------------------------------------------------------- sl@0: */ sl@0: Tcl_PackageInitProc* sl@0: TclpFindSymbol(interp, loadHandle, symbol) sl@0: Tcl_Interp *interp; sl@0: Tcl_LoadHandle loadHandle; sl@0: CONST char *symbol; sl@0: { sl@0: return (Tcl_PackageInitProc *) dld_get_func(symbol); sl@0: } sl@0: sl@0: /* sl@0: *---------------------------------------------------------------------- sl@0: * sl@0: * TclpUnloadFile -- sl@0: * sl@0: * Unloads a dynamically loaded binary code file from memory. sl@0: * Code pointers in the formerly loaded file are no longer valid sl@0: * after calling this function. sl@0: * sl@0: * Results: sl@0: * None. sl@0: * sl@0: * Side effects: sl@0: * Code removed from memory. sl@0: * sl@0: *---------------------------------------------------------------------- sl@0: */ sl@0: sl@0: void sl@0: TclpUnloadFile(loadHandle) sl@0: Tcl_LoadHandle loadHandle; /* loadHandle returned by a previous call sl@0: * to TclpDlopen(). The loadHandle is sl@0: * a token that represents the loaded sl@0: * file. */ sl@0: { sl@0: char *fileName; sl@0: sl@0: handle = (char *) loadHandle; sl@0: dld_unlink_by_file(handle, 0); sl@0: ckfree(handle); sl@0: } sl@0: sl@0: /* sl@0: *---------------------------------------------------------------------- sl@0: * sl@0: * TclGuessPackageName -- sl@0: * sl@0: * If the "load" command is invoked without providing a package sl@0: * name, this procedure is invoked to try to figure it out. sl@0: * sl@0: * Results: sl@0: * Always returns 0 to indicate that we couldn't figure out a sl@0: * package name; generic code will then try to guess the package sl@0: * from the file name. A return value of 1 would have meant that sl@0: * we figured out the package name and put it in bufPtr. sl@0: * sl@0: * Side effects: sl@0: * None. sl@0: * sl@0: *---------------------------------------------------------------------- sl@0: */ sl@0: sl@0: int sl@0: TclGuessPackageName(fileName, bufPtr) sl@0: CONST char *fileName; /* Name of file containing package (already sl@0: * translated to local form if needed). */ sl@0: Tcl_DString *bufPtr; /* Initialized empty dstring. Append sl@0: * package name to this if possible. */ sl@0: { sl@0: return 0; sl@0: }