/* load-dl.c
 *
 * $Id$
 *
 * Copyright 1990, 1991, 1992, 1993, 1994, 1995, Oliver Laumann, Berlin
 * Copyright 2002, 2003 Sam Hocevar <sam@zoy.org>, Paris
 *
 * This software was derived from Elk 1.2, which was Copyright 1987, 1988,
 * 1989, Nixdorf Computer AG and TELES GmbH, Berlin (Elk 1.2 has been written
 * by Oliver Laumann for TELES Telematic Services, Berlin, in a joint project
 * between TELES and Nixdorf Microprocessor Engineering, Berlin).
 *
 * Oliver Laumann, TELES GmbH, Nixdorf Computer AG and Sam Hocevar, as co-
 * owners or individual owners of copyright in this software, grant to any
 * person or company a worldwide, royalty free, license to
 *
 *    i) copy this software,
 *   ii) prepare derivative works based on this software,
 *  iii) distribute copies of this software or derivative works,
 *   iv) perform this software, or
 *    v) display this software,
 *
 * provided that this notice is not removed and that neither Oliver Laumann
 * nor Teles nor Nixdorf are deemed to have made any representations as to
 * the suitability of this software for any purpose nor are held responsible
 * for any defects of this software.
 *
 * THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
 */

#include "config.h"

#ifdef CAN_LOAD_LIB

#include <dlfcn.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "kernel.h"

extern void Free_Symbols (SYMTAB *);
extern void Call_Initializers (SYMTAB *, char *, int);

void Dlopen_File (char *fn) {
    void *handle;
    SYM *sp;

    if (Verb_Load)
        printf ("[dlopen %s]\n", fn);
    if ((handle = dlopen (fn, RTLD_NOW|RTLD_GLOBAL)) == 0) {
        char *errstr = dlerror ();
        Primitive_Error ("dlopen failed:~%~s",
            Make_String (errstr, strlen (errstr)));
    }
    if (The_Symbols)
        Free_Symbols (The_Symbols);
    The_Symbols = Open_File_And_Snarf_Symbols (fn);
    /*
     * dlsym() may fail for symbols not exported by object file;
     * this can be safely ignored.
     */
    for (sp = The_Symbols->first; sp; sp = sp->next)
        sp->value = (unsigned long int)dlsym (handle, sp->name);
    Call_Initializers (The_Symbols, 0, PR_CONSTRUCTOR);
    Call_Initializers (The_Symbols, 0, PR_EXTENSION);
}

static void Load_Lib (Object libs) {
    Object port, name;

    if (Nullp (libs))
        return;

    Load_Lib (Cdr (libs));

    GC_Node2;
    port = name = Null;
    GC_Link2 (port, name);
    port = General_Open_File (Car (libs), P_INPUT, Var_Get (V_Load_Path));
    name = PORT(port)->name;
    Dlopen_File (STRING(name)->data);
    (void)P_Close_Input_Port (port);
    GC_Unlink;
}

void Load_Library (Object libs) {
    Disable_Interrupts;
    Load_Lib (libs);
    Enable_Interrupts;
}

#endif /* CAN_LOAD_LIB */