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markom |
/*
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* tclLoadDl.c --
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*
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* This procedure provides a version of the TclLoadFile that
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* works with the "dlopen" and "dlsym" library procedures for
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* dynamic loading.
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*
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* Copyright (c) 1995 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* RCS: @(#) $Id: tclLoadDl.c,v 1.1.1.1 2002-01-16 10:25:37 markom Exp $
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*/
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#include "tclInt.h"
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#ifdef NO_DLFCN_H
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# include "../compat/dlfcn.h"
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#else
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# include <dlfcn.h>
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#endif
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/*
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* In some systems, like SunOS 4.1.3, the RTLD_NOW flag isn't defined
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* and this argument to dlopen must always be 1. The RTLD_GLOBAL
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* flag is needed on some systems (e.g. SCO and UnixWare) but doesn't
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* exist on others; if it doesn't exist, set it to 0 so it has no effect.
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*/
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#ifndef RTLD_NOW
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# define RTLD_NOW 1
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#endif
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#ifndef RTLD_GLOBAL
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# define RTLD_GLOBAL 0
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#endif
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/*
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*----------------------------------------------------------------------
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*
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* TclLoadFile --
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*
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* Dynamically loads a binary code file into memory and returns
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* the addresses of two procedures within that file, if they
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* are defined.
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*
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* Results:
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* A standard Tcl completion code. If an error occurs, an error
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* message is left in interp->result. *proc1Ptr and *proc2Ptr
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* are filled in with the addresses of the symbols given by
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* *sym1 and *sym2, or NULL if those symbols can't be found.
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*
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* Side effects:
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* New code suddenly appears in memory.
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*
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*----------------------------------------------------------------------
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*/
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int
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TclLoadFile(interp, fileName, sym1, sym2, proc1Ptr, proc2Ptr)
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Tcl_Interp *interp; /* Used for error reporting. */
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char *fileName; /* Name of the file containing the desired
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* code. */
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char *sym1, *sym2; /* Names of two procedures to look up in
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* the file's symbol table. */
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Tcl_PackageInitProc **proc1Ptr, **proc2Ptr;
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/* Where to return the addresses corresponding
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* to sym1 and sym2. */
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{
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VOID *handle;
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Tcl_DString newName;
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handle = dlopen(fileName, RTLD_NOW | RTLD_GLOBAL);
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if (handle == NULL) {
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Tcl_AppendResult(interp, "couldn't load file \"", fileName,
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"\": ", dlerror(), (char *) NULL);
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return TCL_ERROR;
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}
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/*
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* Some platforms still add an underscore to the beginning of symbol
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* names. If we can't find a name without an underscore, try again
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* with the underscore.
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*/
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*proc1Ptr = (Tcl_PackageInitProc *) dlsym(handle, (char *) sym1);
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if (*proc1Ptr == NULL) {
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Tcl_DStringInit(&newName);
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Tcl_DStringAppend(&newName, "_", 1);
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Tcl_DStringAppend(&newName, sym1, -1);
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*proc1Ptr = (Tcl_PackageInitProc *) dlsym(handle,
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Tcl_DStringValue(&newName));
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Tcl_DStringFree(&newName);
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}
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*proc2Ptr = (Tcl_PackageInitProc *) dlsym(handle, (char *) sym2);
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if (*proc2Ptr == NULL) {
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Tcl_DStringInit(&newName);
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Tcl_DStringAppend(&newName, "_", 1);
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Tcl_DStringAppend(&newName, sym2, -1);
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*proc2Ptr = (Tcl_PackageInitProc *) dlsym(handle,
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Tcl_DStringValue(&newName));
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Tcl_DStringFree(&newName);
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}
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return TCL_OK;
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}
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/*
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*----------------------------------------------------------------------
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*
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* TclGuessPackageName --
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*
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* If the "load" command is invoked without providing a package
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* name, this procedure is invoked to try to figure it out.
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*
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* Results:
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* Always returns 0 to indicate that we couldn't figure out a
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* package name; generic code will then try to guess the package
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* from the file name. A return value of 1 would have meant that
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* we figured out the package name and put it in bufPtr.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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int
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TclGuessPackageName(fileName, bufPtr)
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char *fileName; /* Name of file containing package (already
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* translated to local form if needed). */
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Tcl_DString *bufPtr; /* Initialized empty dstring. Append
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* package name to this if possible. */
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{
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return 0;
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}
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