/* * tclLoadDl.c -- * * This procedure provides a version of the TclLoadFile that * works with the "dlopen" and "dlsym" library procedures for * dynamic loading. * * 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: tclLoadDl.c,v 1.13.2.1 2006/06/13 22:54:01 dkf Exp $ */ #include "tclInt.h" #ifdef NO_DLFCN_H # include "../compat/dlfcn.h" #else # include #endif /* * In some systems, like SunOS 4.1.3, the RTLD_NOW flag isn't defined * and this argument to dlopen must always be 1. The RTLD_GLOBAL * flag is needed on some systems (e.g. SCO and UnixWare) but doesn't * exist on others; if it doesn't exist, set it to 0 so it has no effect. */ #ifndef RTLD_NOW # define RTLD_NOW 1 #endif #ifndef RTLD_GLOBAL # define RTLD_GLOBAL 0 #endif /* *--------------------------------------------------------------------------- * * 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). */ 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. */ { VOID *handle; 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); handle = dlopen(native, RTLD_NOW | RTLD_GLOBAL); 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; char *fileName = Tcl_GetString(pathPtr); native = Tcl_UtfToExternalDString(NULL, fileName, -1, &ds); handle = dlopen(native, RTLD_NOW | RTLD_GLOBAL); Tcl_DStringFree(&ds); } if (handle == NULL) { /* * Write the string to a variable first to work around a compiler bug * in the Sun Forte 6 compiler. [Bug 1503729] */ CONST char *errorStr = dlerror(); Tcl_AppendResult(interp, "couldn't load file \"", Tcl_GetString(pathPtr), "\": ", errorStr, (char *) NULL); return TCL_ERROR; } *unloadProcPtr = &TclpUnloadFile; *loadHandle = (Tcl_LoadHandle)handle; 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; Tcl_LoadHandle loadHandle; CONST char *symbol; { CONST char *native; Tcl_DString newName, ds; VOID *handle = (VOID*)loadHandle; Tcl_PackageInitProc *proc; /* * Some platforms still add an underscore to the beginning of symbol * names. If we can't find a name without an underscore, try again * with the underscore. */ native = Tcl_UtfToExternalDString(NULL, symbol, -1, &ds); proc = (Tcl_PackageInitProc *) dlsym(handle, /* INTL: Native. */ native); if (proc == NULL) { Tcl_DStringInit(&newName); Tcl_DStringAppend(&newName, "_", 1); native = Tcl_DStringAppend(&newName, native, -1); proc = (Tcl_PackageInitProc *) dlsym(handle, /* INTL: Native. */ native); Tcl_DStringFree(&newName); } Tcl_DStringFree(&ds); 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) Tcl_LoadHandle loadHandle; /* loadHandle returned by a previous call * to TclpDlopen(). The loadHandle is * a token that represents the loaded * file. */ { VOID *handle; handle = (VOID *) loadHandle; dlclose(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; }