[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, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 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 */

#if 0 /* Disabled until we know for sure that it isn't needed */
/* 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);
}
#endif

#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 some static functions.  These functions are called with
 * deferred interrupts.  When they want to throw errors, they are
 * expected to insert a SCM_ALLOW_INTS before doing the throw.  It
 * might work to throw an error while interrupts are deferred (because
 * they will be unconditionally allowed the next time a SCM_ALLOW_INTS
 * is executed, SCM_DEFER_INTS and SCM_ALLOW_INTS do not nest).
 */

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_DLOPEN
#include "dynl-dl.c"
#else
#ifdef HAVE_SHL_LOAD
#include "dynl-shl.c"
#else
#ifdef HAVE_LIBDLD
#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_ALLOW_INTS;
  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 scm_sizet free_dynl_obj SCM_P ((SCM ptr));
static scm_sizet
free_dynl_obj (ptr)
     SCM ptr;
{
  scm_must_free ((char *)SCM_CDR (ptr));
  return sizeof (struct dynl_obj);
}

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_puts ("#<dynamic-object ", port);
    scm_iprin1 (d->filename, port, pstate);
    if (d->handle == NULL)
      scm_puts (" (unlinked)", port);
    scm_putc ('>', port);
    return 1;
}

static scm_smobfuns dynl_obj_smob = {
    mark_dynl_obj,
    free_dynl_obj,
    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;
    void *handle;
    struct dynl_obj *d;

    fname = scm_coerce_rostring (fname, s_dynamic_link, SCM_ARG1);

    SCM_DEFER_INTS;
    handle = sysdep_dynl_link (SCM_CHARS (fname), s_dynamic_link);

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

    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);
    SCM_DEFER_INTS;
    sysdep_dynl_unlink (d->handle, s_dynamic_unlink);
    d->handle = NULL;
    SCM_ALLOW_INTS;
    return SCM_UNSPECIFIED;
}

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);

    SCM_DEFER_INTS;
    func = (void (*) ()) sysdep_dynl_func (SCM_CHARS (symb), d->handle,
					   s_dynamic_func);
    SCM_ALLOW_INTS;

    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);
    SCM_DEFER_INTS;
    fptr ();
    SCM_ALLOW_INTS;
    return SCM_UNSPECIFIED;
}

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);
    SCM_DEFER_INTS;
    argv = scm_make_argv_from_stringlist (args, &argc, s_dynamic_args_call,
					  SCM_ARG3);
    result = (*fptr) (argc, argv);
    scm_must_free_argv (argv);
    SCM_ALLOW_INTS;

    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
82892bed JB	17	* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
82892bed JB	18	* Boston, MA 02111-1307 USA
1edae076 MV	19	*
	20	* As a special exception, the Free Software Foundation gives permission
	21	* for additional uses of the text contained in its release of GUILE.
	22	*
	23	* The exception is that, if you link the GUILE library with other files
	24	* to produce an executable, this does not by itself cause the
	25	* resulting executable to be covered by the GNU General Public License.
	26	* Your use of that executable is in no way restricted on account of
	27	* linking the GUILE library code into it.
	28	*
	29	* This exception does not however invalidate any other reasons why
	30	* the executable file might be covered by the GNU General Public License.
	31	*
	32	* This exception applies only to the code released by the
	33	* Free Software Foundation under the name GUILE. If you copy
	34	* code from other Free Software Foundation releases into a copy of
	35	* GUILE, as the General Public License permits, the exception does
	36	* not apply to the code that you add in this way. To avoid misleading
	37	* anyone as to the status of such modified files, you must delete
	38	* this exception notice from them.
	39	*
	40	* If you write modifications of your own for GUILE, it is your choice
	41	* whether to permit this exception to apply to your modifications.
82892bed	42	* If you do not wish that, delete this exception notice. */
1edae076 MV	43
	44	/* "dynl.c" dynamically link&load object files.
	45	Author: Aubrey Jaffer
	46	Modified for libguile by Marius Vollmer */
	47
104d4533	48	#if 0 /* Disabled until we know for sure that it isn't needed */
80bc7890 MV	49	/* XXX - This is only here to drag in a definition of __eprintf. This
	50	is needed for proper operation of dynamic linking. The real
	51	solution would probably be a shared libgcc. */
	52
	53	#undef NDEBUG
	54	#include <assert.h>
	55
	56	static void
	57	maybe_drag_in_eprintf ()
	58	{
	59	assert (!maybe_drag_in_eprintf);
	60	}
104d4533	61	#endif
80bc7890	62
96599e6a	63	#include <stdio.h>
1edae076	64	#include "_scm.h"
80bc7890 MV	65	#include "dynl.h"
	66	#include "genio.h"
	67	#include "smob.h"
	68
1edae076 MV	69	/* Converting a list of SCM strings into a argv-style array. You must
	70	have ints disabled for the whole lifetime of the created argv (from
	71	before MAKE_ARGV_FROM_STRINGLIST until after
	72	MUST_FREE_ARGV). Atleast this is was the documentation for
	73	MAKARGVFROMSTRS says, it isn't really used that way.
	74
	75	This code probably belongs into strings.c */
	76
	77	static char *scm_make_argv_from_stringlist SCM_P ((SCM args, int argcp,
	78	char *subr, int argn));
	79
	80	static char **
	81	scm_make_argv_from_stringlist (args, argcp, subr, argn)
	82	SCM args;
	83	int *argcp;
	84	char *subr;
	85	int argn;
	86	{
	87	char **argv;
	88	int argc, i;
	89
	90	argc = scm_ilength(args);
	91	argv = (char *) scm_must_malloc ((1L+argc)sizeof(char *), subr);
	92	for(i = 0; SCM_NNULLP (args); args = SCM_CDR (args), i++) {
	93	size_t len;
	94	char dst, src;
	95	SCM str = SCM_CAR (args);
	96
	97	SCM_ASSERT (SCM_NIMP (str) && SCM_ROSTRINGP (str), str, argn, subr);
	98	len = 1 + SCM_ROLENGTH (str);
	99	dst = (char *) scm_must_malloc ((long)len, subr);
	100	src = SCM_ROCHARS (str);
	101	while (len--)
	102	dst[len] = src[len];
	103	argv[i] = dst;
	104	}
	105
	106	if (argcp)
	107	*argcp = argc;
	108	argv[argc] = 0;
	109	return argv;
	110	}
	111
	112	static void scm_must_free_argv SCM_P ((char **argv));
	113
	114	static void
	115	scm_must_free_argv(argv)
	116	char **argv;
	117	{
	118	char **av = argv;
c3e09ef9 MD	119	while (*av)
c3e09ef9 MD	120	free(*(av++));
1edae076 MV	121	free(argv);
	122	}
	123
	124	/* Coerce an arbitrary readonly-string into a zero-terminated string.
	125	*/
	126
	127	static SCM scm_coerce_rostring SCM_P ((SCM rostr, char *subr, int argn));
	128
	129	static SCM
	130	scm_coerce_rostring (rostr, subr, argn)
	131	SCM rostr;
	132	char *subr;
	133	int argn;
	134	{
	135	SCM_ASSERT (SCM_NIMP (rostr) && SCM_ROSTRINGP (rostr), rostr, argn, subr);
	136	if (SCM_SUBSTRP (rostr))
	137	rostr = scm_makfromstr (SCM_ROCHARS (rostr), SCM_ROLENGTH (rostr), 0);
	138	return rostr;
	139	}
	140
80bc7890 MV	141	/* Module registry
	142	*/
	143
	144	/* We can't use SCM objects here. One should be able to call
	145	SCM_REGISTER_MODULE from a C++ constructor for a static
	146	object. This happens before main and thus before libguile is
	147	initialized. */
	148
	149	struct moddata {
	150	struct moddata *link;
	151	char *module_name;
	152	void *init_func;
	153	};
	154
	155	static struct moddata *registered_mods = NULL;
	156
	157	void
	158	scm_register_module_xxx (module_name, init_func)
	159	char *module_name;
	160	void *init_func;
	161	{
	162	struct moddata *md;
	163
	164	/* XXX - should we (and can we) DEFER_INTS here? */
	165
	166	for (md = registered_mods; md; md = md->link)
	167	if (!strcmp (md->module_name, module_name)) {
	168	md->init_func = init_func;
	169	return;
	170	}
	171
	172	md = (struct moddata *)malloc (sizeof (struct moddata));
96599e6a MV	173	if (md == NULL) {
	174	fprintf (stderr,
	175	"guile: can't register module (%s): not enough memory",
	176	module_name);
80bc7890	177	return;
96599e6a	178	}
80bc7890 MV	179
	180	md->module_name = module_name;
	181	md->init_func = init_func;
	182	md->link = registered_mods;
	183	registered_mods = md;
	184	}
	185
	186	SCM_PROC (s_registered_modules, "c-registered-modules", 0, 0, 0, scm_registered_modules);
	187
	188	SCM
	189	scm_registered_modules ()
	190	{
	191	SCM res;
	192	struct moddata *md;
	193
	194	res = SCM_EOL;
	195	for (md = registered_mods; md; md = md->link)
	196	res = scm_cons (scm_cons (scm_makfrom0str (md->module_name),
	197	scm_ulong2num ((unsigned long) md->init_func)),
	198	res);
	199	return res;
	200	}
	201
	202	SCM_PROC (s_clear_registered_modules, "c-clear-registered-modules", 0, 0, 0, scm_clear_registered_modules);
	203
	204	SCM
	205	scm_clear_registered_modules ()
	206	{
	207	struct moddata md1, md2;
	208
	209	SCM_DEFER_INTS;
	210
	211	for (md1 = registered_mods; md1; md1 = md2) {
	212	md2 = md1->link;
	213	free (md1);
	214	}
	215	registered_mods = NULL;
	216
	217	SCM_ALLOW_INTS;
	218	return SCM_UNSPECIFIED;
	219	}
	220
1edae076	221	/* Dispatch to the system dependent files
80bc7890	222	*
419e9e11 MV	223	* They define some static functions. These functions are called with
	224	* deferred interrupts. When they want to throw errors, they are
	225	* expected to insert a SCM_ALLOW_INTS before doing the throw. It
	226	* might work to throw an error while interrupts are deferred (because
	227	* they will be unconditionally allowed the next time a SCM_ALLOW_INTS
	228	* is executed, SCM_DEFER_INTS and SCM_ALLOW_INTS do not nest).
1edae076 MV	229	*/
1edae076 MV	230
80bc7890 MV	231	static void sysdep_dynl_init SCM_P ((void));
	232	static void sysdep_dynl_link SCM_P ((char filename, char *subr));
	233	static void sysdep_dynl_unlink SCM_P ((void handle, char subr));
	234	static void sysdep_dynl_func SCM_P ((char symbol, void handle, char subr));
	235
26c41b99	236	#ifdef HAVE_DLOPEN
1edae076 MV	237	#include "dynl-dl.c"
	238	#else
	239	#ifdef HAVE_SHL_LOAD
	240	#include "dynl-shl.c"
	241	#else
26c41b99	242	#ifdef HAVE_LIBDLD
1edae076	243	#include "dynl-dld.c"
96599e6a MV	244	#else
	245
	246	/* no dynamic linking available, throw errors. */
	247
	248	static void
	249	sysdep_dynl_init ()
	250	{
	251	}
	252
	253	static void
	254	no_dynl_error (subr)
	255	char *subr;
	256	{
419e9e11 MV	257	SCM_ALLOW_INTS;
419e9e11 MV	258	scm_misc_error (subr, "dynamic linking not available", SCM_EOL);
96599e6a MV	259	}
	260
	261	static void *
	262	sysdep_dynl_link (filename, subr)
	263	char *filename;
	264	char *subr;
	265	{
	266	no_dynl_error (subr);
	267	return NULL;
	268	}
	269
	270	static void
	271	sysdep_dynl_unlink (handle, subr)
	272	void *handle;
	273	char *subr;
	274	{
	275	no_dynl_error (subr);
	276	}
	277
	278	static void *
	279	sysdep_dynl_func (symbol, handle, subr)
	280	char *symbol;
	281	void *handle;
	282	char *subr;
	283	{
	284	no_dynl_error (subr);
	285	return NULL;
	286	}
	287
80bc7890 MV	288	#endif
	289	#endif
	290	#endif
	291
	292	int scm_tc16_dynamic_obj;
	293
	294	struct dynl_obj {
	295	SCM filename;
	296	void *handle;
	297	};
	298
	299	static SCM mark_dynl_obj SCM_P ((SCM ptr));
	300	static SCM
	301	mark_dynl_obj (ptr)
	302	SCM ptr;
	303	{
	304	struct dynl_obj d = (struct dynl_obj )SCM_CDR (ptr);
	305	SCM_SETGC8MARK (ptr);
	306	return d->filename;
	307	}
	308
c487ad44 MV	309	static scm_sizet free_dynl_obj SCM_P ((SCM ptr));
	310	static scm_sizet
	311	free_dynl_obj (ptr)
	312	SCM ptr;
	313	{
	314	scm_must_free ((char *)SCM_CDR (ptr));
	315	return sizeof (struct dynl_obj);
	316	}
	317
80bc7890 MV	318	static int print_dynl_obj SCM_P ((SCM exp, SCM port, scm_print_state *pstate));
	319	static int
	320	print_dynl_obj (exp, port, pstate)
	321	SCM exp;
	322	SCM port;
	323	scm_print_state *pstate;
	324	{
	325	struct dynl_obj d = (struct dynl_obj )SCM_CDR (exp);
b7f3516f	326	scm_puts ("#<dynamic-object ", port);
80bc7890	327	scm_iprin1 (d->filename, port, pstate);
1fe1799f	328	if (d->handle == NULL)
b7f3516f TT	329	scm_puts (" (unlinked)", port);
b7f3516f TT	330	scm_putc ('>', port);
80bc7890 MV	331	return 1;
	332	}
	333
	334	static scm_smobfuns dynl_obj_smob = {
	335	mark_dynl_obj,
c487ad44	336	free_dynl_obj,
80bc7890 MV	337	print_dynl_obj
	338	};
	339
	340	SCM_PROC (s_dynamic_link, "dynamic-link", 1, 0, 0, scm_dynamic_link);
	341
	342	SCM
	343	scm_dynamic_link (fname)
	344	SCM fname;
	345	{
	346	SCM z;
c487ad44	347	void *handle;
80bc7890 MV	348	struct dynl_obj *d;
	349
	350	fname = scm_coerce_rostring (fname, s_dynamic_link, SCM_ARG1);
c487ad44 MV	351
	352	SCM_DEFER_INTS;
	353	handle = sysdep_dynl_link (SCM_CHARS (fname), s_dynamic_link);
	354
80bc7890 MV	355	d = (struct dynl_obj *)scm_must_malloc (sizeof (struct dynl_obj),
	356	s_dynamic_link);
	357	d->filename = fname;
c487ad44	358	d->handle = handle;
80bc7890	359
80bc7890 MV	360	SCM_NEWCELL (z);
	361	SCM_SETCHARS (z, d);
	362	SCM_SETCAR (z, scm_tc16_dynamic_obj);
	363	SCM_ALLOW_INTS;
	364
	365	return z;
	366	}
	367
	368	static struct dynl_obj get_dynl_obj SCM_P ((SCM obj, char subr, int argn));
	369	static struct dynl_obj *
	370	get_dynl_obj (dobj, subr, argn)
	371	SCM dobj;
	372	char *subr;
	373	int argn;
	374	{
	375	struct dynl_obj *d;
	376	SCM_ASSERT (SCM_NIMP (dobj) && SCM_CAR (dobj) == scm_tc16_dynamic_obj,
	377	dobj, argn, subr);
	378	d = (struct dynl_obj *)SCM_CDR (dobj);
	379	SCM_ASSERT (d->handle != NULL, dobj, argn, subr);
	380	return d;
	381	}
	382
	383	SCM_PROC (s_dynamic_object_p, "dynamic-object?", 1, 0, 0, scm_dynamic_object_p);
	384
	385	SCM
	386	scm_dynamic_object_p (SCM obj)
	387	{
	388	return (SCM_NIMP (obj) && SCM_CAR (obj) == scm_tc16_dynamic_obj)?
	389	SCM_BOOL_T : SCM_BOOL_F;
	390	}
	391
	392	SCM_PROC (s_dynamic_unlink, "dynamic-unlink", 1, 0, 0, scm_dynamic_unlink);
	393
	394	SCM
	395	scm_dynamic_unlink (dobj)
	396	SCM dobj;
	397	{
	398	struct dynl_obj *d = get_dynl_obj (dobj, s_dynamic_unlink, SCM_ARG1);
419e9e11	399	SCM_DEFER_INTS;
80bc7890 MV	400	sysdep_dynl_unlink (d->handle, s_dynamic_unlink);
80bc7890 MV	401	d->handle = NULL;
419e9e11 MV	402	SCM_ALLOW_INTS;
419e9e11 MV	403	return SCM_UNSPECIFIED;
80bc7890 MV	404	}
	405
	406	SCM_PROC (s_dynamic_func, "dynamic-func", 2, 0, 0, scm_dynamic_func);
	407
	408	SCM
	409	scm_dynamic_func (SCM symb, SCM dobj)
	410	{
	411	struct dynl_obj *d;
	412	void (*func) ();
	413
	414	symb = scm_coerce_rostring (symb, s_dynamic_func, SCM_ARG1);
	415	d = get_dynl_obj (dobj, s_dynamic_func, SCM_ARG2);
	416
419e9e11	417	SCM_DEFER_INTS;
cdbadcac JB	418	func = (void (*) ()) sysdep_dynl_func (SCM_CHARS (symb), d->handle,
cdbadcac JB	419	s_dynamic_func);
419e9e11 MV	420	SCM_ALLOW_INTS;
419e9e11 MV	421
80bc7890 MV	422	return scm_ulong2num ((unsigned long)func);
	423	}
	424
	425	SCM_PROC (s_dynamic_call, "dynamic-call", 2, 0, 0, scm_dynamic_call);
	426
	427	SCM
	428	scm_dynamic_call (SCM func, SCM dobj)
	429	{
	430	void (*fptr)();
	431
	432	if (SCM_NIMP (func) && SCM_ROSTRINGP (func))
	433	func = scm_dynamic_func (func, dobj);
	434	fptr = (void ()()) scm_num2ulong (func, (char )SCM_ARG1, s_dynamic_call);
419e9e11	435	SCM_DEFER_INTS;
80bc7890	436	fptr ();
419e9e11 MV	437	SCM_ALLOW_INTS;
419e9e11 MV	438	return SCM_UNSPECIFIED;
80bc7890 MV	439	}
	440
	441	SCM_PROC (s_dynamic_args_call, "dynamic-args-call", 3, 0, 0, scm_dynamic_args_call);
	442
	443	SCM
	444	scm_dynamic_args_call (func, dobj, args)
	445	SCM func, dobj, args;
	446	{
	447	int (fptr) (int argc, char *argv);
	448	int result, argc;
	449	char **argv;
	450
	451	if (SCM_NIMP (func) && SCM_ROSTRINGP (func))
	452	func = scm_dynamic_func (func, dobj);
	453
	454	fptr = (int ()(int, char )) scm_num2ulong (func, (char )SCM_ARG1,
	455	s_dynamic_args_call);
419e9e11	456	SCM_DEFER_INTS;
80bc7890 MV	457	argv = scm_make_argv_from_stringlist (args, &argc, s_dynamic_args_call,
80bc7890 MV	458	SCM_ARG3);
80bc7890	459	result = (*fptr) (argc, argv);
80bc7890	460	scm_must_free_argv (argv);
419e9e11 MV	461	SCM_ALLOW_INTS;
419e9e11 MV	462
80bc7890 MV	463	return SCM_MAKINUM(0L+result);
	464	}
	465
1edae076 MV	466	void
	467	scm_init_dynamic_linking ()
	468	{
80bc7890 MV	469	scm_tc16_dynamic_obj = scm_newsmob (&dynl_obj_smob);
	470	sysdep_dynl_init ();
	471	#include "dynl.x"
1edae076	472	}