tclLoadDl.c Go to the documentation of this file. /* * 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 1.16 2006/06/13 22:10:19 dkf Exp $ */ #include "tclInt.h" #ifdef NO_DLFCN_H # include "../compat/dlfcn.h" #else # include <dlfcn.h> #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( 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, 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( Tcl_Interp *interp, /* Place to put error messages. */ Tcl_LoadHandle loadHandle, /* Value from TcpDlopen(). */ CONST char *symbol) /* Symbol to look up. */ { 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( 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( 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; }  /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */

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