Subversion Repositories or1k

/*

 * 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 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 1.1.1.1 2002-01-16 10:25:37 markom 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

/*

 *----------------------------------------------------------------------

 *

 * TclLoadFile --

 *

 *      Dynamically loads a binary code file into memory and returns

 *      the addresses of two procedures within that file, if they

 *      are defined.

 *

 * Results:

 *      A standard Tcl completion code.  If an error occurs, an error

 *      message is left in interp->result.  *proc1Ptr and *proc2Ptr

 *      are filled in with the addresses of the symbols given by

 *      *sym1 and *sym2, or NULL if those symbols can't be found.

 *

 * Side effects:

 *      New code suddenly appears in memory.

 *

 *----------------------------------------------------------------------

 */

int

TclLoadFile(interp, fileName, sym1, sym2, proc1Ptr, proc2Ptr)

    Tcl_Interp *interp;         /* Used for error reporting. */

    char *fileName;             /* Name of the file containing the desired

                                 * code. */

    char *sym1, *sym2;          /* Names of two procedures to look up in

                                 * the file's symbol table. */

    Tcl_PackageInitProc **proc1Ptr, **proc2Ptr;

                                /* Where to return the addresses corresponding

                                 * to sym1 and sym2. */

{

    VOID *handle;

    Tcl_DString newName;

    handle = dlopen(fileName, RTLD_NOW | RTLD_GLOBAL);

    if (handle == NULL) {

        Tcl_AppendResult(interp, "couldn't load file \"", fileName,

                "\": ", dlerror(), (char *) NULL);

        return TCL_ERROR;

    }

    /*

     * 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.

     */

    *proc1Ptr = (Tcl_PackageInitProc *) dlsym(handle, (char *) sym1);

    if (*proc1Ptr == NULL) {

        Tcl_DStringInit(&newName);

        Tcl_DStringAppend(&newName, "_", 1);

        Tcl_DStringAppend(&newName, sym1, -1);

        *proc1Ptr = (Tcl_PackageInitProc *) dlsym(handle,

                Tcl_DStringValue(&newName));

        Tcl_DStringFree(&newName);

    }

    *proc2Ptr = (Tcl_PackageInitProc *) dlsym(handle, (char *) sym2);

    if (*proc2Ptr == NULL) {

        Tcl_DStringInit(&newName);

        Tcl_DStringAppend(&newName, "_", 1);

        Tcl_DStringAppend(&newName, sym2, -1);

        *proc2Ptr = (Tcl_PackageInitProc *) dlsym(handle,

                Tcl_DStringValue(&newName));

        Tcl_DStringFree(&newName);

    }

    return TCL_OK;

}

/*

 *----------------------------------------------------------------------

 *

 * 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)

    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;

}