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

/* dynl.c - dynamic linking
 *
 * 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 */

/* 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 <stdio.h>

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

/* 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) {
	fprintf (stderr,
		 "guile: can't register module (%s): not enough memory",
		 module_name);
	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, throw errors. */

static void
sysdep_dynl_init ()
{
}

static void
no_dynl_error (subr)
     char *subr;
{
    scm_misc_error (subr, "dynamic linking not available", SCM_EOL);
}
    
static void *
sysdep_dynl_link (filename, subr)
     char *filename;
     char *subr;
{
    no_dynl_error (subr);
    return NULL;
}

static void 
sysdep_dynl_unlink (handle, subr)
     void *handle;
     char *subr;
{
    no_dynl_error (subr);
}

static void *
sysdep_dynl_func (symbol, handle, subr)
     char *symbol;
     void *handle;
     char *subr;
{
    no_dynl_error (subr);
    return NULL;
}

#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 (SCM_CHARS (symb), d->handle, 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"
}
Commit	Line	Data
1edae076 MV	1	/* dynl.c - dynamic linking
1edae076 MV	2	*
96599e6a	3	* Copyright (C) 1990-1997 Free Software Foundation, Inc.
1edae076 MV	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
96599e6a MV	61	#include <stdio.h>
96599e6a MV	62
1edae076	63	#include "_scm.h"
80bc7890 MV	64	#include "dynl.h"
	65	#include "genio.h"
	66	#include "smob.h"
	67
1edae076 MV	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));
96599e6a MV	172	if (md == NULL) {
	173	fprintf (stderr,
	174	"guile: can't register module (%s): not enough memory",
	175	module_name);
80bc7890	176	return;
96599e6a	177	}
80bc7890 MV	178
	179	md->module_name = module_name;
	180	md->init_func = init_func;
	181	md->link = registered_mods;
	182	registered_mods = md;
	183	}
	184
	185	SCM_PROC (s_registered_modules, "c-registered-modules", 0, 0, 0, scm_registered_modules);
	186
	187	SCM
	188	scm_registered_modules ()
	189	{
	190	SCM res;
	191	struct moddata *md;
	192
	193	res = SCM_EOL;
	194	for (md = registered_mods; md; md = md->link)
	195	res = scm_cons (scm_cons (scm_makfrom0str (md->module_name),
	196	scm_ulong2num ((unsigned long) md->init_func)),
	197	res);
	198	return res;
	199	}
	200
	201	SCM_PROC (s_clear_registered_modules, "c-clear-registered-modules", 0, 0, 0, scm_clear_registered_modules);
	202
	203	SCM
	204	scm_clear_registered_modules ()
	205	{
	206	struct moddata md1, md2;
	207
	208	SCM_DEFER_INTS;
	209
	210	for (md1 = registered_mods; md1; md1 = md2) {
	211	md2 = md1->link;
	212	free (md1);
	213	}
	214	registered_mods = NULL;
	215
	216	SCM_ALLOW_INTS;
	217	return SCM_UNSPECIFIED;
	218	}
	219
1edae076	220	/* Dispatch to the system dependent files
80bc7890 MV	221	*
80bc7890 MV	222	* They define these static functions:
1edae076 MV	223	*/
1edae076 MV	224
80bc7890 MV	225	static void sysdep_dynl_init SCM_P ((void));
	226	static void sysdep_dynl_link SCM_P ((char filename, char *subr));
	227	static void sysdep_dynl_unlink SCM_P ((void handle, char subr));
	228	static void sysdep_dynl_func SCM_P ((char symbol, void handle, char subr));
	229
1edae076 MV	230	#ifdef HAVE_LIBDL
	231	#include "dynl-dl.c"
	232	#else
	233	#ifdef HAVE_SHL_LOAD
	234	#include "dynl-shl.c"
	235	#else
	236	#ifdef HAVE_DLD
	237	#include "dynl-dld.c"
96599e6a MV	238	#else
	239
	240	/* no dynamic linking available, throw errors. */
	241
	242	static void
	243	sysdep_dynl_init ()
	244	{
	245	}
	246
	247	static void
	248	no_dynl_error (subr)
	249	char *subr;
	250	{
	251	scm_misc_error (subr, "dynamic linking not available", SCM_EOL);
	252	}
	253
	254	static void *
	255	sysdep_dynl_link (filename, subr)
	256	char *filename;
	257	char *subr;
	258	{
	259	no_dynl_error (subr);
	260	return NULL;
	261	}
	262
	263	static void
	264	sysdep_dynl_unlink (handle, subr)
	265	void *handle;
	266	char *subr;
	267	{
	268	no_dynl_error (subr);
	269	}
	270
	271	static void *
	272	sysdep_dynl_func (symbol, handle, subr)
	273	char *symbol;
	274	void *handle;
	275	char *subr;
	276	{
	277	no_dynl_error (subr);
	278	return NULL;
	279	}
	280
80bc7890 MV	281	#endif
	282	#endif
	283	#endif
	284
	285	int scm_tc16_dynamic_obj;
	286
	287	struct dynl_obj {
	288	SCM filename;
	289	void *handle;
	290	};
	291
	292	static SCM mark_dynl_obj SCM_P ((SCM ptr));
	293	static SCM
	294	mark_dynl_obj (ptr)
	295	SCM ptr;
	296	{
	297	struct dynl_obj d = (struct dynl_obj )SCM_CDR (ptr);
	298	SCM_SETGC8MARK (ptr);
	299	return d->filename;
	300	}
	301
	302	static int print_dynl_obj SCM_P ((SCM exp, SCM port, scm_print_state *pstate));
	303	static int
	304	print_dynl_obj (exp, port, pstate)
	305	SCM exp;
	306	SCM port;
	307	scm_print_state *pstate;
	308	{
	309	struct dynl_obj d = (struct dynl_obj )SCM_CDR (exp);
	310	scm_gen_puts (scm_regular_string, "#<dynamic-object ", port);
	311	scm_iprin1 (d->filename, port, pstate);
	312	scm_gen_putc ('>', port);
	313	return 1;
	314	}
	315
	316	static scm_smobfuns dynl_obj_smob = {
	317	mark_dynl_obj,
	318	scm_free0,
	319	print_dynl_obj
	320	};
	321
	322	SCM_PROC (s_dynamic_link, "dynamic-link", 1, 0, 0, scm_dynamic_link);
	323
	324	SCM
	325	scm_dynamic_link (fname)
	326	SCM fname;
	327	{
	328	SCM z;
	329	struct dynl_obj *d;
	330
	331	fname = scm_coerce_rostring (fname, s_dynamic_link, SCM_ARG1);
	332	d = (struct dynl_obj *)scm_must_malloc (sizeof (struct dynl_obj),
	333	s_dynamic_link);
	334	d->filename = fname;
	335
	336	SCM_DEFER_INTS;
	337	d->handle = sysdep_dynl_link (SCM_CHARS (fname), s_dynamic_link);
	338	SCM_NEWCELL (z);
	339	SCM_SETCHARS (z, d);
	340	SCM_SETCAR (z, scm_tc16_dynamic_obj);
	341	SCM_ALLOW_INTS;
	342
	343	return z;
	344	}
345
346	static struct dynl_obj get_dynl_obj SCM_P ((SCM obj, char subr, int argn));
347	static struct dynl_obj *
348	get_dynl_obj (dobj, subr, argn)
349	SCM dobj;
350	char *subr;
351	int argn;
352	{
353	struct dynl_obj *d;
354	SCM_ASSERT (SCM_NIMP (dobj) && SCM_CAR (dobj) == scm_tc16_dynamic_obj,
355	dobj, argn, subr);
356	d = (struct dynl_obj *)SCM_CDR (dobj);
357	SCM_ASSERT (d->handle != NULL, dobj, argn, subr);
358	return d;
359	}
360
361	SCM_PROC (s_dynamic_object_p, "dynamic-object?", 1, 0, 0, scm_dynamic_object_p);
362
363	SCM
364	scm_dynamic_object_p (SCM obj)
365	{
366	return (SCM_NIMP (obj) && SCM_CAR (obj) == scm_tc16_dynamic_obj)?
367	SCM_BOOL_T : SCM_BOOL_F;
368	}
369
370	SCM_PROC (s_dynamic_unlink, "dynamic-unlink", 1, 0, 0, scm_dynamic_unlink);
371
372	SCM
373	scm_dynamic_unlink (dobj)
374	SCM dobj;
375	{
376	struct dynl_obj *d = get_dynl_obj (dobj, s_dynamic_unlink, SCM_ARG1);
377	sysdep_dynl_unlink (d->handle, s_dynamic_unlink);
378	d->handle = NULL;
379	return SCM_BOOL_T;
380	}
381
382	SCM_PROC (s_dynamic_func, "dynamic-func", 2, 0, 0, scm_dynamic_func);
383
384	SCM
385	scm_dynamic_func (SCM symb, SCM dobj)
386	{
387	struct dynl_obj *d;
388	void (*func) ();
389
390	symb = scm_coerce_rostring (symb, s_dynamic_func, SCM_ARG1);
391	d = get_dynl_obj (dobj, s_dynamic_func, SCM_ARG2);
392
96599e6a	393	func = sysdep_dynl_func (SCM_CHARS (symb), d->handle, s_dynamic_func);
80bc7890 MV	394	return scm_ulong2num ((unsigned long)func);
	395	}
	396
	397	SCM_PROC (s_dynamic_call, "dynamic-call", 2, 0, 0, scm_dynamic_call);
	398
	399	SCM
	400	scm_dynamic_call (SCM func, SCM dobj)
	401	{
	402	void (*fptr)();
	403
	404	if (SCM_NIMP (func) && SCM_ROSTRINGP (func))
	405	func = scm_dynamic_func (func, dobj);
	406	fptr = (void ()()) scm_num2ulong (func, (char )SCM_ARG1, s_dynamic_call);
	407	fptr ();
	408	return SCM_BOOL_T;
	409	}
	410
	411	SCM_PROC (s_dynamic_args_call, "dynamic-args-call", 3, 0, 0, scm_dynamic_args_call);
	412
	413	SCM
	414	scm_dynamic_args_call (func, dobj, args)
	415	SCM func, dobj, args;
	416	{
	417	int (fptr) (int argc, char *argv);
	418	int result, argc;
	419	char **argv;
	420
	421	if (SCM_NIMP (func) && SCM_ROSTRINGP (func))
	422	func = scm_dynamic_func (func, dobj);
	423
	424	fptr = (int ()(int, char )) scm_num2ulong (func, (char )SCM_ARG1,
	425	s_dynamic_args_call);
	426	argv = scm_make_argv_from_stringlist (args, &argc, s_dynamic_args_call,
	427	SCM_ARG3);
	428
	429	result = (*fptr) (argc, argv);
	430
	431	scm_must_free_argv (argv);
	432	return SCM_MAKINUM(0L+result);
	433	}
	434
1edae076 MV	435	void
	436	scm_init_dynamic_linking ()
	437	{
80bc7890 MV	438	scm_tc16_dynamic_obj = scm_newsmob (&dynl_obj_smob);
	439	sysdep_dynl_init ();
	440	#include "dynl.x"
1edae076	441	}