source: downloads/tcl8.5.2/unix/tclLoadOSF.c @ 47

/*
 * tclLoadOSF.c --
 *
 *      This function provides a version of the TclLoadFile that works under
 *      OSF/1 1.0/1.1/1.2 and related systems, utilizing the old OSF/1
 *      /sbin/loader and /usr/include/loader.h. OSF/1 versions from 1.3 and on
 *      use ELF, rtld, and dlopen()[/usr/include/ldfcn.h].
 *
 *      This is useful for:
 *              OSF/1 1.0, 1.1, 1.2 (from OSF)
 *                      includes: MK4 and AD1 (from OSF RI)
 *              OSF/1 1.3 (from OSF) using ROSE
 *              HP OSF/1 1.0 ("Acorn") using COFF
 *
 *      This is likely to be useful for:
 *              Paragon OSF/1 (from Intel)
 *              HI-OSF/1 (from Hitachi)
 *
 *      This is NOT to be used on:
 *              Digitial Alpha OSF/1 systems
 *              OSF/1 1.3 or later (from OSF) using ELF
 *                      includes: MK6, MK7, AD2, AD3 (from OSF RI)
 *
 *      This approach to things was utter @&^#; thankfully, OSF/1 eventually
 *      supported dlopen().
 *
 *      John Robert LoVerso <loverso@freebsd.osf.org>
 *
 * 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: tclLoadOSF.c,v 1.13 2005/11/11 23:46:34 dkf Exp $
 */

#include "tclInt.h"
#include <sys/types.h>
#include <loader.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. */
{
    ldr_module_t lm;
    char *pkg;
    char *fileName = Tcl_GetString(pathPtr);
    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);
    lm = (Tcl_PackageInitProc *) load(native, LDR_NOFLAGS);

    if (lm == LDR_NULL_MODULE) {
        /*
         * 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);
        lm = (Tcl_PackageInitProc *) load(native, LDR_NOFLAGS);
        Tcl_DStringFree(&ds);
    }

    if (lm == LDR_NULL_MODULE) {
        Tcl_AppendResult(interp, "couldn't load file \"", fileName, "\": ",
                Tcl_PosixError(interp), NULL);
        return TCL_ERROR;
    }

    *clientDataPtr = NULL;

    /*
     * My convention is to use a [OSF loader] package name the same as shlib,
     * since the idiots never implemented ldr_lookup() and it is otherwise
     * impossible to get a package name given a module.
     *
     * I build loadable modules with a makefile rule like
     *          ld ... -export $@: -o $@ $(OBJS)
     */

    if ((pkg = strrchr(fileName, '/')) == NULL) {
        pkg = fileName;
    } else {
        pkg++;
    }
    *loadHandle = pkg;
    *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)
{
    return ldr_lookup_package((char *)loadHandle, symbol);
}

/*
 *----------------------------------------------------------------------
 *
 * 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:
 *      Does nothing.  Can anything be done?
 *
 *----------------------------------------------------------------------
 */

void
TclpUnloadFile(
    Tcl_LoadHandle loadHandle)  /* loadHandle returned by a previous call to
                                 * TclpDlopen(). The loadHandle is a token
                                 * that represents the loaded file. */
{
}

/*
 *----------------------------------------------------------------------
 *
 * TclGuessPackageName --
 *
 *      If the "load" command is invoked without providing a package name,
 *      this function 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:
 */