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

/* dynl.c - dynamic linking
 *
 * Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995 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 */

/* XXX - This is only here to drag in a definition of __eprintf. This
   is needed for proper operation of dynamic linking. The real
   solution would probably be a shared libgcc. */

#undef NDEBUG
#include <assert.h>

static void
maybe_drag_in_eprintf ()
{
  assert (!maybe_drag_in_eprintf);
}

#include "_scm.h"
#include "dynl.h"
#include "genio.h"
#include "smob.h"

#ifdef DYNAMIC_LINKING

/* Converting a list of SCM strings into a argv-style array.  You must
   have ints disabled for the whole lifetime of the created argv (from
   before MAKE_ARGV_FROM_STRINGLIST until after
   MUST_FREE_ARGV). Atleast this is was the documentation for
   MAKARGVFROMSTRS says, it isn't really used that way.

   This code probably belongs into strings.c */

static char **scm_make_argv_from_stringlist SCM_P ((SCM args, int *argcp,
						    char *subr, int argn));

static char **
scm_make_argv_from_stringlist (args, argcp, subr, argn)
     SCM args;
     int *argcp;
     char *subr;
     int argn;
{
    char **argv;
    int argc, i;

    argc = scm_ilength(args);
    argv = (char **) scm_must_malloc ((1L+argc)*sizeof(char *), subr);
    for(i = 0; SCM_NNULLP (args); args = SCM_CDR (args), i++) {
	size_t len;
	char *dst, *src;
	SCM str = SCM_CAR (args);

	SCM_ASSERT (SCM_NIMP (str) && SCM_ROSTRINGP (str), str, argn, subr);
	len = 1 + SCM_ROLENGTH (str);
	dst = (char *) scm_must_malloc ((long)len, subr);
	src = SCM_ROCHARS (str);
	while (len--)
	    dst[len] = src[len];
	argv[i] = dst;
    }

    if (argcp)
	*argcp = argc;
    argv[argc] = 0;
    return argv;
}

static void scm_must_free_argv SCM_P ((char **argv));

static void
scm_must_free_argv(argv)
     char **argv;
{
    char **av = argv;
    while(!(*av))
	free(*(av++));
    free(argv);
}

/* Coerce an arbitrary readonly-string into a zero-terminated string.
 */

static SCM scm_coerce_rostring SCM_P ((SCM rostr, char *subr, int argn));

static SCM
scm_coerce_rostring (rostr, subr, argn)
     SCM rostr;
     char *subr;
     int argn;
{
    SCM_ASSERT (SCM_NIMP (rostr) && SCM_ROSTRINGP (rostr), rostr, argn, subr);
    if (SCM_SUBSTRP (rostr))
	rostr = scm_makfromstr (SCM_ROCHARS (rostr), SCM_ROLENGTH (rostr), 0);
    return rostr;
}

/* Module registry
 */

/* We can't use SCM objects here. One should be able to call
   SCM_REGISTER_MODULE from a C++ constructor for a static
   object. This happens before main and thus before libguile is
   initialized. */

struct moddata {
    struct moddata *link;
    char *module_name;
    void *init_func;
};

static struct moddata *registered_mods = NULL;

void
scm_register_module_xxx (module_name, init_func)
     char *module_name;
     void *init_func;
{
    struct moddata *md;

    /* XXX - should we (and can we) DEFER_INTS here? */

    for (md = registered_mods; md; md = md->link)
	if (!strcmp (md->module_name, module_name)) {
	    md->init_func = init_func;
	    return;
	}

    md = (struct moddata *)malloc (sizeof (struct moddata));
    if (md == NULL)
	return;

    md->module_name = module_name;
    md->init_func = init_func;
    md->link = registered_mods;
    registered_mods = md;
}

SCM_PROC (s_registered_modules, "c-registered-modules", 0, 0, 0, scm_registered_modules);

SCM
scm_registered_modules ()
{
    SCM res;
    struct moddata *md;

    res = SCM_EOL;
    for (md = registered_mods; md; md = md->link)
	res = scm_cons (scm_cons (scm_makfrom0str (md->module_name),
				  scm_ulong2num ((unsigned long) md->init_func)),
			res);
    return res;
}

SCM_PROC (s_clear_registered_modules, "c-clear-registered-modules", 0, 0, 0, scm_clear_registered_modules);

SCM
scm_clear_registered_modules ()
{
    struct moddata *md1, *md2;

    SCM_DEFER_INTS;

    for (md1 = registered_mods; md1; md1 = md2) {
	md2 = md1->link;
	free (md1);
    }
    registered_mods = NULL;

    SCM_ALLOW_INTS;
    return SCM_UNSPECIFIED;
}

/* Dispatch to the system dependent files
 *
 * They define these static functions:
 */

static void sysdep_dynl_init SCM_P ((void));
static void *sysdep_dynl_link SCM_P ((char *filename, char *subr));
static void sysdep_dynl_unlink SCM_P ((void *handle, char *subr));
static void *sysdep_dynl_func SCM_P ((char *symbol, void *handle, char *subr));

#ifdef HAVE_LIBDL
#include "dynl-dl.c"
#else
#ifdef HAVE_SHL_LOAD
#include "dynl-shl.c"
#else
#ifdef HAVE_DLD
#include "dynl-dld.c"
#else /* no dynamic linking available */
/* configure should not have defined DYNAMIC_LINKING in this case */
#error Dynamic linking not implemented for your system.
#endif
#endif
#endif

int scm_tc16_dynamic_obj;

struct dynl_obj {
    SCM filename;
    void *handle;
};

static SCM mark_dynl_obj SCM_P ((SCM ptr));
static SCM
mark_dynl_obj (ptr)
     SCM ptr;
{
    struct dynl_obj *d = (struct dynl_obj *)SCM_CDR (ptr);
    SCM_SETGC8MARK (ptr);
    return d->filename;
}

static int print_dynl_obj SCM_P ((SCM exp, SCM port, scm_print_state *pstate));
static int
print_dynl_obj (exp, port, pstate)
     SCM exp;
     SCM port;
     scm_print_state *pstate;
{
    struct dynl_obj *d = (struct dynl_obj *)SCM_CDR (exp);
    scm_gen_puts (scm_regular_string, "#<dynamic-object ", port);
    scm_iprin1 (d->filename, port, pstate);
    scm_gen_putc ('>', port);
    return 1;
}

static scm_smobfuns dynl_obj_smob = {
    mark_dynl_obj,
    scm_free0,
    print_dynl_obj
};
  
SCM_PROC (s_dynamic_link, "dynamic-link", 1, 0, 0, scm_dynamic_link);

SCM
scm_dynamic_link (fname)
     SCM fname;
{
    SCM z;
    struct dynl_obj *d;

    fname = scm_coerce_rostring (fname, s_dynamic_link, SCM_ARG1);
    d = (struct dynl_obj *)scm_must_malloc (sizeof (struct dynl_obj),
					    s_dynamic_link);
    d->filename = fname;

    SCM_DEFER_INTS;
    d->handle = sysdep_dynl_link (SCM_CHARS (fname), s_dynamic_link);
    SCM_NEWCELL (z);
    SCM_SETCHARS (z, d);
    SCM_SETCAR (z, scm_tc16_dynamic_obj);
    SCM_ALLOW_INTS;

    return z;
}

static struct dynl_obj *get_dynl_obj SCM_P ((SCM obj, char *subr, int argn));
static struct dynl_obj *
get_dynl_obj (dobj, subr, argn)
     SCM dobj;
     char *subr;
     int argn;
{
    struct dynl_obj *d;
    SCM_ASSERT (SCM_NIMP (dobj) && SCM_CAR (dobj) == scm_tc16_dynamic_obj,
		dobj, argn, subr);
    d = (struct dynl_obj *)SCM_CDR (dobj);
    SCM_ASSERT (d->handle != NULL, dobj, argn, subr);
    return d;
}

SCM_PROC (s_dynamic_object_p, "dynamic-object?", 1, 0, 0, scm_dynamic_object_p);

SCM
scm_dynamic_object_p (SCM obj)
{
    return (SCM_NIMP (obj) && SCM_CAR (obj) == scm_tc16_dynamic_obj)?
	SCM_BOOL_T : SCM_BOOL_F;
}

SCM_PROC (s_dynamic_unlink, "dynamic-unlink", 1, 0, 0, scm_dynamic_unlink);

SCM
scm_dynamic_unlink (dobj)
     SCM dobj;
{
    struct dynl_obj *d = get_dynl_obj (dobj, s_dynamic_unlink, SCM_ARG1);
    sysdep_dynl_unlink (d->handle, s_dynamic_unlink);
    d->handle = NULL;
    return SCM_BOOL_T;
}

SCM_PROC (s_dynamic_func, "dynamic-func", 2, 0, 0, scm_dynamic_func);

SCM
scm_dynamic_func (SCM symb, SCM dobj)
{
    struct dynl_obj *d;
    void (*func) ();

    symb = scm_coerce_rostring (symb, s_dynamic_func, SCM_ARG1);
    d = get_dynl_obj (dobj, s_dynamic_func, SCM_ARG2);

    func = sysdep_dynl_func (d->handle, SCM_CHARS (symb), s_dynamic_func);
    return scm_ulong2num ((unsigned long)func);
}

SCM_PROC (s_dynamic_call, "dynamic-call", 2, 0, 0, scm_dynamic_call);

SCM
scm_dynamic_call (SCM func, SCM dobj)
{
    void (*fptr)();

    if (SCM_NIMP (func) && SCM_ROSTRINGP (func))
	func = scm_dynamic_func (func, dobj);
    fptr = (void (*)()) scm_num2ulong (func, (char *)SCM_ARG1, s_dynamic_call);
    fptr ();
    return SCM_BOOL_T;
}

SCM_PROC (s_dynamic_args_call, "dynamic-args-call", 3, 0, 0, scm_dynamic_args_call);

SCM
scm_dynamic_args_call (func, dobj, args)
     SCM func, dobj, args;
{
    int (*fptr) (int argc, char **argv);
    int result, argc;
    char **argv;

    if (SCM_NIMP (func) && SCM_ROSTRINGP (func))
	func = scm_dynamic_func (func, dobj);

    fptr = (int (*)(int, char **)) scm_num2ulong (func, (char *)SCM_ARG1,
						   s_dynamic_args_call);
    argv = scm_make_argv_from_stringlist (args, &argc, s_dynamic_args_call,
					  SCM_ARG3);

    result = (*fptr) (argc, argv);

    scm_must_free_argv (argv);
    return SCM_MAKINUM(0L+result);
}

void
scm_init_dynamic_linking ()
{
    scm_tc16_dynamic_obj = scm_newsmob (&dynl_obj_smob);
    sysdep_dynl_init ();
#include "dynl.x"
}

#else /* not DYNAMIC_LINKING */

void
scm_init_dynamic_linking ()
{
#include "dynl.x"
}

#endif /* not DYNAMIC_LINKING */
Commit	Line	Data
1edae076 MV	1	/* dynl.c - dynamic linking
	2	*
	3	* Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2, or (at your option)
	8	* any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this software; see the file COPYING. If not, write to
	17	* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
	18	*
	19	* As a special exception, the Free Software Foundation gives permission
	20	* for additional uses of the text contained in its release of GUILE.
	21	*
	22	* The exception is that, if you link the GUILE library with other files
	23	* to produce an executable, this does not by itself cause the
	24	* resulting executable to be covered by the GNU General Public License.
	25	* Your use of that executable is in no way restricted on account of
	26	* linking the GUILE library code into it.
	27	*
	28	* This exception does not however invalidate any other reasons why
	29	* the executable file might be covered by the GNU General Public License.
	30	*
	31	* This exception applies only to the code released by the
	32	* Free Software Foundation under the name GUILE. If you copy
	33	* code from other Free Software Foundation releases into a copy of
	34	* GUILE, as the General Public License permits, the exception does
	35	* not apply to the code that you add in this way. To avoid misleading
	36	* anyone as to the status of such modified files, you must delete
	37	* this exception notice from them.
	38	*
	39	* If you write modifications of your own for GUILE, it is your choice
	40	* whether to permit this exception to apply to your modifications.
	41	* If you do not wish that, delete this exception notice.
	42	*/
	43
	44	/* "dynl.c" dynamically link&load object files.
	45	Author: Aubrey Jaffer
	46	Modified for libguile by Marius Vollmer */
	47
80bc7890 MV	48	/* XXX - This is only here to drag in a definition of __eprintf. This
	49	is needed for proper operation of dynamic linking. The real
	50	solution would probably be a shared libgcc. */
	51
	52	#undef NDEBUG
	53	#include <assert.h>
	54
	55	static void
	56	maybe_drag_in_eprintf ()
	57	{
	58	assert (!maybe_drag_in_eprintf);
	59	}
	60
1edae076	61	#include "_scm.h"
80bc7890 MV	62	#include "dynl.h"
	63	#include "genio.h"
	64	#include "smob.h"
	65
	66	#ifdef DYNAMIC_LINKING
1edae076 MV	67
	68	/* Converting a list of SCM strings into a argv-style array. You must
	69	have ints disabled for the whole lifetime of the created argv (from
	70	before MAKE_ARGV_FROM_STRINGLIST until after
	71	MUST_FREE_ARGV). Atleast this is was the documentation for
	72	MAKARGVFROMSTRS says, it isn't really used that way.
	73
	74	This code probably belongs into strings.c */
	75
	76	static char *scm_make_argv_from_stringlist SCM_P ((SCM args, int argcp,
	77	char *subr, int argn));
	78
	79	static char **
	80	scm_make_argv_from_stringlist (args, argcp, subr, argn)
	81	SCM args;
	82	int *argcp;
	83	char *subr;
	84	int argn;
	85	{
	86	char **argv;
	87	int argc, i;
	88
	89	argc = scm_ilength(args);
	90	argv = (char *) scm_must_malloc ((1L+argc)sizeof(char *), subr);
	91	for(i = 0; SCM_NNULLP (args); args = SCM_CDR (args), i++) {
	92	size_t len;
	93	char dst, src;
	94	SCM str = SCM_CAR (args);
	95
	96	SCM_ASSERT (SCM_NIMP (str) && SCM_ROSTRINGP (str), str, argn, subr);
	97	len = 1 + SCM_ROLENGTH (str);
	98	dst = (char *) scm_must_malloc ((long)len, subr);
	99	src = SCM_ROCHARS (str);
	100	while (len--)
	101	dst[len] = src[len];
	102	argv[i] = dst;
	103	}
	104
	105	if (argcp)
	106	*argcp = argc;
	107	argv[argc] = 0;
	108	return argv;
	109	}
	110
	111	static void scm_must_free_argv SCM_P ((char **argv));
	112
	113	static void
	114	scm_must_free_argv(argv)
	115	char **argv;
	116	{
	117	char **av = argv;
	118	while(!(*av))
	119	free(*(av++));
	120	free(argv);
	121	}
	122
	123	/* Coerce an arbitrary readonly-string into a zero-terminated string.
	124	*/
	125
	126	static SCM scm_coerce_rostring SCM_P ((SCM rostr, char *subr, int argn));
	127
	128	static SCM
	129	scm_coerce_rostring (rostr, subr, argn)
	130	SCM rostr;
131	char *subr;
132	int argn;
133	{
134	SCM_ASSERT (SCM_NIMP (rostr) && SCM_ROSTRINGP (rostr), rostr, argn, subr);
135	if (SCM_SUBSTRP (rostr))
136	rostr = scm_makfromstr (SCM_ROCHARS (rostr), SCM_ROLENGTH (rostr), 0);
137	return rostr;
138	}
139
80bc7890 MV	140	/* Module registry
	141	*/
	142
	143	/* We can't use SCM objects here. One should be able to call
	144	SCM_REGISTER_MODULE from a C++ constructor for a static
	145	object. This happens before main and thus before libguile is
	146	initialized. */
	147
	148	struct moddata {
	149	struct moddata *link;
	150	char *module_name;
	151	void *init_func;
	152	};
	153
	154	static struct moddata *registered_mods = NULL;
	155
	156	void
	157	scm_register_module_xxx (module_name, init_func)
	158	char *module_name;
	159	void *init_func;
	160	{
	161	struct moddata *md;
	162
	163	/* XXX - should we (and can we) DEFER_INTS here? */
	164
	165	for (md = registered_mods; md; md = md->link)
	166	if (!strcmp (md->module_name, module_name)) {
	167	md->init_func = init_func;
	168	return;
	169	}
	170
	171	md = (struct moddata *)malloc (sizeof (struct moddata));
	172	if (md == NULL)
	173	return;
	174
	175	md->module_name = module_name;
	176	md->init_func = init_func;
	177	md->link = registered_mods;
	178	registered_mods = md;
	179	}
	180
	181	SCM_PROC (s_registered_modules, "c-registered-modules", 0, 0, 0, scm_registered_modules);
	182
	183	SCM
	184	scm_registered_modules ()
	185	{
	186	SCM res;
	187	struct moddata *md;
	188
	189	res = SCM_EOL;
	190	for (md = registered_mods; md; md = md->link)
	191	res = scm_cons (scm_cons (scm_makfrom0str (md->module_name),
	192	scm_ulong2num ((unsigned long) md->init_func)),
	193	res);
	194	return res;
	195	}
	196
	197	SCM_PROC (s_clear_registered_modules, "c-clear-registered-modules", 0, 0, 0, scm_clear_registered_modules);
	198
	199	SCM
	200	scm_clear_registered_modules ()
	201	{
	202	struct moddata md1, md2;
	203
204	SCM_DEFER_INTS;
205
206	for (md1 = registered_mods; md1; md1 = md2) {
207	md2 = md1->link;
208	free (md1);
209	}
210	registered_mods = NULL;
211
212	SCM_ALLOW_INTS;
213	return SCM_UNSPECIFIED;
214	}
215
1edae076	216	/* Dispatch to the system dependent files
80bc7890 MV	217	*
80bc7890 MV	218	* They define these static functions:
1edae076 MV	219	*/
1edae076 MV	220
80bc7890 MV	221	static void sysdep_dynl_init SCM_P ((void));
	222	static void sysdep_dynl_link SCM_P ((char filename, char *subr));
	223	static void sysdep_dynl_unlink SCM_P ((void handle, char subr));
	224	static void sysdep_dynl_func SCM_P ((char symbol, void handle, char subr));
	225
1edae076 MV	226	#ifdef HAVE_LIBDL
	227	#include "dynl-dl.c"
	228	#else
	229	#ifdef HAVE_SHL_LOAD
	230	#include "dynl-shl.c"
	231	#else
	232	#ifdef HAVE_DLD
	233	#include "dynl-dld.c"
	234	#else /* no dynamic linking available */
80bc7890 MV	235	/* configure should not have defined DYNAMIC_LINKING in this case */
	236	#error Dynamic linking not implemented for your system.
	237	#endif
	238	#endif
	239	#endif
	240
	241	int scm_tc16_dynamic_obj;
	242
	243	struct dynl_obj {
	244	SCM filename;
	245	void *handle;
	246	};
	247
	248	static SCM mark_dynl_obj SCM_P ((SCM ptr));
	249	static SCM
	250	mark_dynl_obj (ptr)
	251	SCM ptr;
	252	{
	253	struct dynl_obj d = (struct dynl_obj )SCM_CDR (ptr);
	254	SCM_SETGC8MARK (ptr);
	255	return d->filename;
	256	}
	257
	258	static int print_dynl_obj SCM_P ((SCM exp, SCM port, scm_print_state *pstate));
	259	static int
	260	print_dynl_obj (exp, port, pstate)
	261	SCM exp;
	262	SCM port;
	263	scm_print_state *pstate;
	264	{
	265	struct dynl_obj d = (struct dynl_obj )SCM_CDR (exp);
	266	scm_gen_puts (scm_regular_string, "#<dynamic-object ", port);
	267	scm_iprin1 (d->filename, port, pstate);
	268	scm_gen_putc ('>', port);
	269	return 1;
	270	}
	271
	272	static scm_smobfuns dynl_obj_smob = {
	273	mark_dynl_obj,
	274	scm_free0,
	275	print_dynl_obj
	276	};
	277
	278	SCM_PROC (s_dynamic_link, "dynamic-link", 1, 0, 0, scm_dynamic_link);
	279
	280	SCM
	281	scm_dynamic_link (fname)
	282	SCM fname;
	283	{
	284	SCM z;
	285	struct dynl_obj *d;
	286
	287	fname = scm_coerce_rostring (fname, s_dynamic_link, SCM_ARG1);
	288	d = (struct dynl_obj *)scm_must_malloc (sizeof (struct dynl_obj),
	289	s_dynamic_link);
	290	d->filename = fname;
	291
	292	SCM_DEFER_INTS;
	293	d->handle = sysdep_dynl_link (SCM_CHARS (fname), s_dynamic_link);
	294	SCM_NEWCELL (z);
	295	SCM_SETCHARS (z, d);
	296	SCM_SETCAR (z, scm_tc16_dynamic_obj);
	297	SCM_ALLOW_INTS;
	298
299	return z;
300	}
301
302	static struct dynl_obj get_dynl_obj SCM_P ((SCM obj, char subr, int argn));
303	static struct dynl_obj *
304	get_dynl_obj (dobj, subr, argn)
305	SCM dobj;
306	char *subr;
307	int argn;
308	{
309	struct dynl_obj *d;
310	SCM_ASSERT (SCM_NIMP (dobj) && SCM_CAR (dobj) == scm_tc16_dynamic_obj,
311	dobj, argn, subr);
312	d = (struct dynl_obj *)SCM_CDR (dobj);
313	SCM_ASSERT (d->handle != NULL, dobj, argn, subr);
314	return d;
315	}
316
317	SCM_PROC (s_dynamic_object_p, "dynamic-object?", 1, 0, 0, scm_dynamic_object_p);
318
319	SCM
320	scm_dynamic_object_p (SCM obj)
321	{
322	return (SCM_NIMP (obj) && SCM_CAR (obj) == scm_tc16_dynamic_obj)?
323	SCM_BOOL_T : SCM_BOOL_F;
324	}
325
326	SCM_PROC (s_dynamic_unlink, "dynamic-unlink", 1, 0, 0, scm_dynamic_unlink);
327
328	SCM
329	scm_dynamic_unlink (dobj)
330	SCM dobj;
331	{
332	struct dynl_obj *d = get_dynl_obj (dobj, s_dynamic_unlink, SCM_ARG1);
333	sysdep_dynl_unlink (d->handle, s_dynamic_unlink);
334	d->handle = NULL;
335	return SCM_BOOL_T;
336	}
337
338	SCM_PROC (s_dynamic_func, "dynamic-func", 2, 0, 0, scm_dynamic_func);
339
340	SCM
341	scm_dynamic_func (SCM symb, SCM dobj)
342	{
343	struct dynl_obj *d;
344	void (*func) ();
345
346	symb = scm_coerce_rostring (symb, s_dynamic_func, SCM_ARG1);
347	d = get_dynl_obj (dobj, s_dynamic_func, SCM_ARG2);
348
349	func = sysdep_dynl_func (d->handle, SCM_CHARS (symb), s_dynamic_func);
350	return scm_ulong2num ((unsigned long)func);
351	}
352
353	SCM_PROC (s_dynamic_call, "dynamic-call", 2, 0, 0, scm_dynamic_call);
354
355	SCM
356	scm_dynamic_call (SCM func, SCM dobj)
357	{
358	void (*fptr)();
359
360	if (SCM_NIMP (func) && SCM_ROSTRINGP (func))
361	func = scm_dynamic_func (func, dobj);
362	fptr = (void ()()) scm_num2ulong (func, (char )SCM_ARG1, s_dynamic_call);
363	fptr ();
364	return SCM_BOOL_T;
365	}
366
367	SCM_PROC (s_dynamic_args_call, "dynamic-args-call", 3, 0, 0, scm_dynamic_args_call);
368
369	SCM
370	scm_dynamic_args_call (func, dobj, args)
371	SCM func, dobj, args;
372	{
373	int (fptr) (int argc, char *argv);
374	int result, argc;
375	char **argv;
376
377	if (SCM_NIMP (func) && SCM_ROSTRINGP (func))
378	func = scm_dynamic_func (func, dobj);
379
380	fptr = (int ()(int, char )) scm_num2ulong (func, (char )SCM_ARG1,
381	s_dynamic_args_call);
382	argv = scm_make_argv_from_stringlist (args, &argc, s_dynamic_args_call,
383	SCM_ARG3);
384
385	result = (*fptr) (argc, argv);
386
387	scm_must_free_argv (argv);
388	return SCM_MAKINUM(0L+result);
389	}
390
1edae076 MV	391	void
	392	scm_init_dynamic_linking ()
	393	{
80bc7890 MV	394	scm_tc16_dynamic_obj = scm_newsmob (&dynl_obj_smob);
	395	sysdep_dynl_init ();
	396	#include "dynl.x"
1edae076	397	}
80bc7890 MV	398
	399	#else /* not DYNAMIC_LINKING */
	400
1edae076 MV	401	void
	402	scm_init_dynamic_linking ()
	403	{
80bc7890	404	#include "dynl.x"
1edae076	405	}
80bc7890 MV	406
80bc7890 MV	407	#endif /* not DYNAMIC_LINKING */