tclLoadShl.c Go to the documentation of this file. /* * 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 (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: tclLoadShl.c,v 1.16 2005/11/11 23:46:34 dkf Exp $ */ #include <dl.h> /* * On some HP machines, dl.h defines EXTERN; remove that definition. */ #ifdef EXTERN # undef EXTERN #endif #include "tclInt.h"  /* *---------------------------------------------------------------------- * * 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. */ { shl_t handle; CONST char *native; char *fileName = Tcl_GetString(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_AppendResult(interp, "couldn't load file \"", fileName, "\": ", Tcl_PosixError(interp), (char *) NULL); return TCL_ERROR; } *loadHandle = (Tcl_LoadHandle) handle; *unloadProcPtr = &TclpUnloadFile; 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, Tcl_LoadHandle loadHandle, CONST char *symbol) { Tcl_DString newName; Tcl_PackageInitProc *proc = NULL; shl_t handle = (shl_t)loadHandle; /* * 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); Tcl_DStringAppend(&newName, "_", 1); Tcl_DStringAppend(&newName, symbol, -1); if (shl_findsym(&handle, Tcl_DStringValue(&newName), (short) TYPE_PROCEDURE, (void *) &proc) != 0) { proc = NULL; } Tcl_DStringFree(&newName); } 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. */ { shl_t handle; handle = (shl_t) loadHandle; shl_unload(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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