* ports.c (scm_char_ready_p): bug fix: in SCM_PROC char-ready's

[bpt/guile.git] / libguile / dynl-dl.c

/* dynl-dl.c - dynamic linking for dlopen/dlsym
 *
 * Copyright (C) 1990-1997 Free Software Foundation, Inc.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this software; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * As a special exception, the Free Software Foundation gives permission
 * for additional uses of the text contained in its release of GUILE.
 *
 * The exception is that, if you link the GUILE library with other files
 * to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the GUILE library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the
 * Free Software Foundation under the name GUILE.  If you copy
 * code from other Free Software Foundation releases into a copy of
 * GUILE, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for GUILE, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.  
 */

/* "dynl.c" dynamically link&load object files.
   Author: Aubrey Jaffer
   Modified for libguile by Marius Vollmer */

#include <dlfcn.h>

#ifdef RTLD_LAZY	/* Solaris 2. */
#  define DLOPEN_MODE	RTLD_LAZY
#else
#  define DLOPEN_MODE	1	/* Thats what it says in the man page. */
#endif

static void *
sysdep_dynl_link (fname, subr)
     char *fname;
     char *subr;
{
    void *handle = dlopen (fname, DLOPEN_MODE);
    if (NULL == handle)
	scm_misc_error (subr, (char *)dlerror (), SCM_EOL);
    return handle;
}

static void
sysdep_dynl_unlink (handle, subr)
     void *handle;
     char *subr;
{
    int status;

    SCM_DEFER_INTS;
    status = dlclose (handle);
    SCM_ALLOW_INTS;
    if(status)
	scm_misc_error (subr, (char *)dlerror (), SCM_EOL);
}
   
static void *
sysdep_dynl_func (symb, handle, subr)
     char *symb;
     void *handle;
     char *subr;
{
    void *fptr;
    char *err;

    SCM_DEFER_INTS;
    fptr = dlsym (handle, symb);
    err = (char *)dlerror ();
    SCM_ALLOW_INTS;

    if (!fptr)
	scm_misc_error (subr, err? err : "symbol has NULL address", SCM_EOL);
    return fptr;
}

static void
sysdep_dynl_init ()
{
}