Commit | Line | Data |
---|---|---|
1edae076 MV |
1 | /* dynl.c - dynamic linking |
2 | * | |
a80a90e9 | 3 | * Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999 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, |
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 | 43 | |
1bbd0b84 GB |
44 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, |
45 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
46 | ||
47 | ||
1edae076 MV |
48 | /* "dynl.c" dynamically link&load object files. |
49 | Author: Aubrey Jaffer | |
50 | Modified for libguile by Marius Vollmer */ | |
51 | ||
104d4533 | 52 | #if 0 /* Disabled until we know for sure that it isn't needed */ |
80bc7890 MV |
53 | /* XXX - This is only here to drag in a definition of __eprintf. This |
54 | is needed for proper operation of dynamic linking. The real | |
55 | solution would probably be a shared libgcc. */ | |
56 | ||
57 | #undef NDEBUG | |
58 | #include <assert.h> | |
59 | ||
60 | static void | |
61 | maybe_drag_in_eprintf () | |
62 | { | |
63 | assert (!maybe_drag_in_eprintf); | |
64 | } | |
104d4533 | 65 | #endif |
80bc7890 | 66 | |
96599e6a | 67 | #include <stdio.h> |
1edae076 | 68 | #include "_scm.h" |
80bc7890 MV |
69 | #include "dynl.h" |
70 | #include "genio.h" | |
71 | #include "smob.h" | |
8e3ab003 | 72 | #include "keywords.h" |
80bc7890 | 73 | |
1edae076 MV |
74 | /* Converting a list of SCM strings into a argv-style array. You must |
75 | have ints disabled for the whole lifetime of the created argv (from | |
76 | before MAKE_ARGV_FROM_STRINGLIST until after | |
77 | MUST_FREE_ARGV). Atleast this is was the documentation for | |
78 | MAKARGVFROMSTRS says, it isn't really used that way. | |
79 | ||
80 | This code probably belongs into strings.c */ | |
81 | ||
1edae076 | 82 | static char ** |
1bbd0b84 | 83 | scm_make_argv_from_stringlist (SCM args,int *argcp,const char *subr,int argn) |
1edae076 MV |
84 | { |
85 | char **argv; | |
86 | int argc, i; | |
87 | ||
88 | argc = scm_ilength(args); | |
89 | argv = (char **) scm_must_malloc ((1L+argc)*sizeof(char *), subr); | |
90 | for(i = 0; SCM_NNULLP (args); args = SCM_CDR (args), i++) { | |
91 | size_t len; | |
92 | char *dst, *src; | |
93 | SCM str = SCM_CAR (args); | |
94 | ||
0c95b57d | 95 | SCM_ASSERT (SCM_ROSTRINGP (str), str, argn, subr); |
1edae076 MV |
96 | len = 1 + SCM_ROLENGTH (str); |
97 | dst = (char *) scm_must_malloc ((long)len, subr); | |
98 | src = SCM_ROCHARS (str); | |
99 | while (len--) | |
100 | dst[len] = src[len]; | |
101 | argv[i] = dst; | |
102 | } | |
103 | ||
104 | if (argcp) | |
105 | *argcp = argc; | |
106 | argv[argc] = 0; | |
107 | return argv; | |
108 | } | |
109 | ||
1edae076 | 110 | static void |
1bbd0b84 | 111 | scm_must_free_argv(char **argv) |
1edae076 MV |
112 | { |
113 | char **av = argv; | |
c3e09ef9 MD |
114 | while (*av) |
115 | free(*(av++)); | |
1edae076 MV |
116 | free(argv); |
117 | } | |
118 | ||
119 | /* Coerce an arbitrary readonly-string into a zero-terminated string. | |
120 | */ | |
121 | ||
1edae076 | 122 | static SCM |
1bbd0b84 | 123 | scm_coerce_rostring (SCM rostr,const char *subr,int argn) |
1edae076 | 124 | { |
0c95b57d | 125 | SCM_ASSERT (SCM_ROSTRINGP (rostr), rostr, argn, subr); |
1edae076 MV |
126 | if (SCM_SUBSTRP (rostr)) |
127 | rostr = scm_makfromstr (SCM_ROCHARS (rostr), SCM_ROLENGTH (rostr), 0); | |
128 | return rostr; | |
129 | } | |
130 | ||
80bc7890 MV |
131 | /* Module registry |
132 | */ | |
133 | ||
134 | /* We can't use SCM objects here. One should be able to call | |
135 | SCM_REGISTER_MODULE from a C++ constructor for a static | |
136 | object. This happens before main and thus before libguile is | |
137 | initialized. */ | |
138 | ||
139 | struct moddata { | |
140 | struct moddata *link; | |
141 | char *module_name; | |
142 | void *init_func; | |
143 | }; | |
144 | ||
145 | static struct moddata *registered_mods = NULL; | |
146 | ||
147 | void | |
6e8d25a6 | 148 | scm_register_module_xxx (char *module_name, void *init_func) |
80bc7890 MV |
149 | { |
150 | struct moddata *md; | |
151 | ||
152 | /* XXX - should we (and can we) DEFER_INTS here? */ | |
153 | ||
154 | for (md = registered_mods; md; md = md->link) | |
155 | if (!strcmp (md->module_name, module_name)) { | |
156 | md->init_func = init_func; | |
157 | return; | |
158 | } | |
159 | ||
160 | md = (struct moddata *)malloc (sizeof (struct moddata)); | |
96599e6a MV |
161 | if (md == NULL) { |
162 | fprintf (stderr, | |
163 | "guile: can't register module (%s): not enough memory", | |
164 | module_name); | |
80bc7890 | 165 | return; |
96599e6a | 166 | } |
80bc7890 MV |
167 | |
168 | md->module_name = module_name; | |
169 | md->init_func = init_func; | |
170 | md->link = registered_mods; | |
171 | registered_mods = md; | |
172 | } | |
173 | ||
1bbd0b84 GB |
174 | GUILE_PROC (scm_registered_modules, "c-registered-modules", 0, 0, 0, |
175 | (), | |
4079f87e GB |
176 | "Return a list of the object code modules that have been imported into |
177 | the current Guile process. Each element of the list is a pair whose | |
178 | car is the name of the module (as it might be used by | |
179 | @code{use-modules}, for instance), and whose cdr is the function handle | |
180 | for that module's initializer function.") | |
1bbd0b84 | 181 | #define FUNC_NAME s_scm_registered_modules |
80bc7890 MV |
182 | { |
183 | SCM res; | |
184 | struct moddata *md; | |
185 | ||
186 | res = SCM_EOL; | |
187 | for (md = registered_mods; md; md = md->link) | |
188 | res = scm_cons (scm_cons (scm_makfrom0str (md->module_name), | |
189 | scm_ulong2num ((unsigned long) md->init_func)), | |
190 | res); | |
191 | return res; | |
192 | } | |
1bbd0b84 | 193 | #undef FUNC_NAME |
80bc7890 | 194 | |
1bbd0b84 GB |
195 | GUILE_PROC (scm_clear_registered_modules, "c-clear-registered-modules", 0, 0, 0, |
196 | (), | |
4079f87e GB |
197 | "Destroy the list of modules registered with the current Guile process. |
198 | The return value is unspecified. @strong{Warning:} this function does | |
199 | not actually unlink or deallocate these modules, but only destroys the | |
200 | records of which modules have been loaded. It should therefore be used | |
201 | only by module bookkeeping operations.") | |
1bbd0b84 | 202 | #define FUNC_NAME s_scm_clear_registered_modules |
80bc7890 MV |
203 | { |
204 | struct moddata *md1, *md2; | |
205 | ||
206 | SCM_DEFER_INTS; | |
207 | ||
208 | for (md1 = registered_mods; md1; md1 = md2) { | |
209 | md2 = md1->link; | |
210 | free (md1); | |
211 | } | |
212 | registered_mods = NULL; | |
213 | ||
214 | SCM_ALLOW_INTS; | |
215 | return SCM_UNSPECIFIED; | |
216 | } | |
1bbd0b84 | 217 | #undef FUNC_NAME |
80bc7890 | 218 | |
1edae076 | 219 | /* Dispatch to the system dependent files |
80bc7890 | 220 | * |
419e9e11 MV |
221 | * They define some static functions. These functions are called with |
222 | * deferred interrupts. When they want to throw errors, they are | |
223 | * expected to insert a SCM_ALLOW_INTS before doing the throw. It | |
224 | * might work to throw an error while interrupts are deferred (because | |
225 | * they will be unconditionally allowed the next time a SCM_ALLOW_INTS | |
226 | * is executed, SCM_DEFER_INTS and SCM_ALLOW_INTS do not nest). | |
1edae076 MV |
227 | */ |
228 | ||
8e3ab003 MV |
229 | #define DYNL_GLOBAL 0x0001 |
230 | ||
26c41b99 | 231 | #ifdef HAVE_DLOPEN |
1edae076 MV |
232 | #include "dynl-dl.c" |
233 | #else | |
234 | #ifdef HAVE_SHL_LOAD | |
235 | #include "dynl-shl.c" | |
236 | #else | |
26c41b99 | 237 | #ifdef HAVE_LIBDLD |
1edae076 | 238 | #include "dynl-dld.c" |
96599e6a MV |
239 | #else |
240 | ||
241 | /* no dynamic linking available, throw errors. */ | |
242 | ||
243 | static void | |
1bbd0b84 | 244 | sysdep_dynl_init (void) |
96599e6a MV |
245 | { |
246 | } | |
247 | ||
248 | static void | |
a80a90e9 | 249 | no_dynl_error (const char *subr) |
96599e6a | 250 | { |
419e9e11 MV |
251 | SCM_ALLOW_INTS; |
252 | scm_misc_error (subr, "dynamic linking not available", SCM_EOL); | |
96599e6a MV |
253 | } |
254 | ||
255 | static void * | |
8e3ab003 MV |
256 | sysdep_dynl_link (const char *filename, |
257 | int flags, | |
a80a90e9 | 258 | const char *subr) |
96599e6a MV |
259 | { |
260 | no_dynl_error (subr); | |
261 | return NULL; | |
262 | } | |
263 | ||
264 | static void | |
a80a90e9 JB |
265 | sysdep_dynl_unlink (void *handle, |
266 | const char *subr) | |
96599e6a MV |
267 | { |
268 | no_dynl_error (subr); | |
269 | } | |
270 | ||
271 | static void * | |
a80a90e9 JB |
272 | sysdep_dynl_func (const char *symbol, |
273 | void *handle, | |
274 | const char *subr) | |
96599e6a MV |
275 | { |
276 | no_dynl_error (subr); | |
277 | return NULL; | |
278 | } | |
279 | ||
80bc7890 MV |
280 | #endif |
281 | #endif | |
282 | #endif | |
283 | ||
284 | int scm_tc16_dynamic_obj; | |
285 | ||
286 | struct dynl_obj { | |
287 | SCM filename; | |
288 | void *handle; | |
289 | }; | |
290 | ||
80bc7890 | 291 | static SCM |
1bbd0b84 | 292 | mark_dynl_obj (SCM ptr) |
80bc7890 MV |
293 | { |
294 | struct dynl_obj *d = (struct dynl_obj *)SCM_CDR (ptr); | |
80bc7890 MV |
295 | return d->filename; |
296 | } | |
297 | ||
c487ad44 | 298 | static scm_sizet |
1bbd0b84 | 299 | free_dynl_obj (SCM ptr) |
c487ad44 MV |
300 | { |
301 | scm_must_free ((char *)SCM_CDR (ptr)); | |
302 | return sizeof (struct dynl_obj); | |
303 | } | |
304 | ||
80bc7890 | 305 | static int |
1bbd0b84 | 306 | print_dynl_obj (SCM exp,SCM port,scm_print_state *pstate) |
80bc7890 MV |
307 | { |
308 | struct dynl_obj *d = (struct dynl_obj *)SCM_CDR (exp); | |
b7f3516f | 309 | scm_puts ("#<dynamic-object ", port); |
80bc7890 | 310 | scm_iprin1 (d->filename, port, pstate); |
1fe1799f | 311 | if (d->handle == NULL) |
b7f3516f TT |
312 | scm_puts (" (unlinked)", port); |
313 | scm_putc ('>', port); | |
80bc7890 MV |
314 | return 1; |
315 | } | |
316 | ||
8e3ab003 MV |
317 | static SCM kw_global; |
318 | SCM_SYMBOL (sym_global, "-global"); | |
319 | ||
1bbd0b84 GB |
320 | GUILE_PROC (scm_dynamic_link, "dynamic-link", 1, 0, 1, |
321 | (SCM fname, SCM rest), | |
4079f87e GB |
322 | "Open the dynamic library @var{library-file}. A library handle |
323 | representing the opened library is returned; this handle should be used | |
324 | as the @var{lib} argument to the following functions.") | |
1bbd0b84 | 325 | #define FUNC_NAME s_scm_dynamic_link |
80bc7890 MV |
326 | { |
327 | SCM z; | |
c487ad44 | 328 | void *handle; |
80bc7890 | 329 | struct dynl_obj *d; |
8e3ab003 | 330 | int flags = DYNL_GLOBAL; |
80bc7890 | 331 | |
1bbd0b84 | 332 | fname = scm_coerce_rostring (fname, FUNC_NAME, SCM_ARG1); |
c487ad44 | 333 | |
8e3ab003 | 334 | /* collect flags */ |
0c95b57d | 335 | while (SCM_CONSP (rest)) |
8e3ab003 MV |
336 | { |
337 | SCM kw, val; | |
338 | ||
339 | kw = SCM_CAR (rest); | |
340 | rest = SCM_CDR (rest); | |
341 | ||
0c95b57d | 342 | if (!SCM_CONSP (rest)) |
1bbd0b84 | 343 | scm_misc_error (FUNC_NAME, "keyword without value", SCM_EOL); |
8e3ab003 MV |
344 | |
345 | val = SCM_CAR (rest); | |
346 | rest = SCM_CDR (rest); | |
347 | ||
348 | if (kw == kw_global) | |
349 | { | |
350 | if (SCM_FALSEP (val)) | |
351 | flags &= ~DYNL_GLOBAL; | |
352 | } | |
353 | else | |
1bbd0b84 | 354 | scm_misc_error (FUNC_NAME, "unknown keyword argument: %s", |
8e3ab003 MV |
355 | scm_cons (kw, SCM_EOL)); |
356 | } | |
357 | ||
c487ad44 | 358 | SCM_DEFER_INTS; |
1bbd0b84 | 359 | handle = sysdep_dynl_link (SCM_CHARS (fname), flags, FUNC_NAME); |
c487ad44 | 360 | |
80bc7890 | 361 | d = (struct dynl_obj *)scm_must_malloc (sizeof (struct dynl_obj), |
1bbd0b84 | 362 | FUNC_NAME); |
80bc7890 | 363 | d->filename = fname; |
c487ad44 | 364 | d->handle = handle; |
80bc7890 | 365 | |
80bc7890 MV |
366 | SCM_NEWCELL (z); |
367 | SCM_SETCHARS (z, d); | |
368 | SCM_SETCAR (z, scm_tc16_dynamic_obj); | |
369 | SCM_ALLOW_INTS; | |
370 | ||
371 | return z; | |
372 | } | |
1bbd0b84 | 373 | #undef FUNC_NAME |
80bc7890 | 374 | |
80bc7890 | 375 | static struct dynl_obj * |
1bbd0b84 | 376 | get_dynl_obj (SCM dobj,const char *subr,int argn) |
80bc7890 MV |
377 | { |
378 | struct dynl_obj *d; | |
379 | SCM_ASSERT (SCM_NIMP (dobj) && SCM_CAR (dobj) == scm_tc16_dynamic_obj, | |
380 | dobj, argn, subr); | |
381 | d = (struct dynl_obj *)SCM_CDR (dobj); | |
382 | SCM_ASSERT (d->handle != NULL, dobj, argn, subr); | |
383 | return d; | |
384 | } | |
385 | ||
1bbd0b84 GB |
386 | GUILE_PROC (scm_dynamic_object_p, "dynamic-object?", 1, 0, 0, |
387 | (SCM obj), | |
4079f87e GB |
388 | "Return @code{#t} if @var{obj} is a dynamic library handle, or @code{#f} |
389 | otherwise.") | |
1bbd0b84 | 390 | #define FUNC_NAME s_scm_dynamic_object_p |
80bc7890 | 391 | { |
156dcb09 | 392 | return SCM_BOOL(SCM_NIMP (obj) && SCM_CAR (obj) == scm_tc16_dynamic_obj); |
80bc7890 | 393 | } |
1bbd0b84 | 394 | #undef FUNC_NAME |
80bc7890 | 395 | |
1bbd0b84 GB |
396 | GUILE_PROC (scm_dynamic_unlink, "dynamic-unlink", 1, 0, 0, |
397 | (SCM dobj), | |
4079f87e GB |
398 | "Unlink the library represented by @var{library-handle}, and remove any |
399 | imported symbols from the address space. | |
400 | GJB:FIXME:DOC: 2nd version below: | |
401 | Unlink the indicated object file from the application. The argument | |
402 | @var{dynobj} should be one of the values returned by | |
403 | @code{dynamic-link}. When @code{dynamic-unlink} has been called on | |
404 | @var{dynobj}, it is no longer usable as an argument to the functions | |
405 | below and you will get type mismatch errors when you try to. | |
406 | ") | |
1bbd0b84 | 407 | #define FUNC_NAME s_scm_dynamic_unlink |
80bc7890 | 408 | { |
1bbd0b84 | 409 | struct dynl_obj *d = get_dynl_obj (dobj, FUNC_NAME, SCM_ARG1); |
419e9e11 | 410 | SCM_DEFER_INTS; |
1bbd0b84 | 411 | sysdep_dynl_unlink (d->handle, FUNC_NAME); |
80bc7890 | 412 | d->handle = NULL; |
419e9e11 MV |
413 | SCM_ALLOW_INTS; |
414 | return SCM_UNSPECIFIED; | |
80bc7890 | 415 | } |
1bbd0b84 | 416 | #undef FUNC_NAME |
80bc7890 | 417 | |
1bbd0b84 GB |
418 | GUILE_PROC (scm_dynamic_func, "dynamic-func", 2, 0, 0, |
419 | (SCM symb, SCM dobj), | |
4079f87e GB |
420 | "Import the symbol @var{func} from @var{lib} (a dynamic library handle). |
421 | A @dfn{function handle} representing the imported function is returned. | |
422 | GJB:FIXME:DOC: 2nd version below | |
423 | Search the C function indicated by @var{function} (a string or symbol) | |
424 | in @var{dynobj} and return some Scheme object that can later be used | |
425 | with @code{dynamic-call} to actually call this function. Right now, | |
426 | these Scheme objects are formed by casting the address of the function | |
427 | to @code{long} and converting this number to its Scheme representation. | |
428 | ||
429 | Regardless whether your C compiler prepends an underscore @samp{_} to | |
430 | the global names in a program, you should @strong{not} include this | |
431 | underscore in @var{function}. Guile knows whether the underscore is | |
432 | needed or not and will add it when necessary. | |
433 | ||
434 | ") | |
1bbd0b84 | 435 | #define FUNC_NAME s_scm_dynamic_func |
80bc7890 MV |
436 | { |
437 | struct dynl_obj *d; | |
438 | void (*func) (); | |
439 | ||
1bbd0b84 GB |
440 | symb = scm_coerce_rostring (symb, FUNC_NAME, SCM_ARG1); |
441 | d = get_dynl_obj (dobj, FUNC_NAME, SCM_ARG2); | |
80bc7890 | 442 | |
419e9e11 | 443 | SCM_DEFER_INTS; |
cdbadcac | 444 | func = (void (*) ()) sysdep_dynl_func (SCM_CHARS (symb), d->handle, |
1bbd0b84 | 445 | FUNC_NAME); |
419e9e11 MV |
446 | SCM_ALLOW_INTS; |
447 | ||
80bc7890 MV |
448 | return scm_ulong2num ((unsigned long)func); |
449 | } | |
1bbd0b84 | 450 | #undef FUNC_NAME |
80bc7890 | 451 | |
1bbd0b84 GB |
452 | GUILE_PROC (scm_dynamic_call, "dynamic-call", 2, 0, 0, |
453 | (SCM func, SCM dobj), | |
4079f87e GB |
454 | "Call @var{lib-thunk}, a procedure of no arguments. If @var{lib-thunk} |
455 | is a string, it is assumed to be a symbol found in the dynamic library | |
456 | @var{lib} and is fetched with @code{dynamic-func}. Otherwise, it should | |
457 | be a function handle returned by a previous call to @code{dynamic-func}. | |
458 | The return value is unspecified. | |
459 | GJB:FIXME:DOC 2nd version below | |
460 | Call the C function indicated by @var{function} and @var{dynobj}. The | |
461 | function is passed no arguments and its return value is ignored. When | |
462 | @var{function} is something returned by @code{dynamic-func}, call that | |
463 | function and ignore @var{dynobj}. When @var{function} is a string (or | |
464 | symbol, etc.), look it up in @var{dynobj}; this is equivalent to | |
465 | ||
466 | @smallexample | |
467 | (dynamic-call (dynamic-func @var{function} @var{dynobj} #f)) | |
468 | @end smallexample | |
469 | ||
470 | Interrupts are deferred while the C function is executing (with | |
471 | @code{SCM_DEFER_INTS}/@code{SCM_ALLOW_INTS}). | |
472 | ") | |
1bbd0b84 | 473 | #define FUNC_NAME s_scm_dynamic_call |
80bc7890 MV |
474 | { |
475 | void (*fptr)(); | |
476 | ||
0c95b57d | 477 | if (SCM_ROSTRINGP (func)) |
80bc7890 | 478 | func = scm_dynamic_func (func, dobj); |
1bbd0b84 | 479 | fptr = (void (*)()) scm_num2ulong (func, (char *)SCM_ARG1, FUNC_NAME); |
419e9e11 | 480 | SCM_DEFER_INTS; |
80bc7890 | 481 | fptr (); |
419e9e11 MV |
482 | SCM_ALLOW_INTS; |
483 | return SCM_UNSPECIFIED; | |
80bc7890 | 484 | } |
1bbd0b84 | 485 | #undef FUNC_NAME |
80bc7890 | 486 | |
1bbd0b84 GB |
487 | GUILE_PROC (scm_dynamic_args_call, "dynamic-args-call", 3, 0, 0, |
488 | (SCM func, SCM dobj, SCM args), | |
4079f87e GB |
489 | "Call @var{proc}, a dynamically loaded function, passing it the argument |
490 | list @var{args} (a list of strings). As with @code{dynamic-call}, | |
491 | @var{proc} should be either a function handle or a string, in which case | |
492 | it is first fetched from @var{lib} with @code{dynamic-func}. | |
493 | ||
494 | @var{proc} is assumed to return an integer, which is used as the return | |
495 | value from @code{dynamic-args-call}. | |
496 | ||
497 | GJB:FIXME:DOC 2nd version below | |
498 | Call the C function indicated by @var{function} and @var{dynobj}, just | |
499 | like @code{dynamic-call}, but pass it some arguments and return its | |
500 | return value. The C function is expected to take two arguments and | |
501 | return an @code{int}, just like @code{main}: | |
502 | ||
503 | @smallexample | |
504 | int c_func (int argc, char **argv); | |
505 | @end smallexample | |
506 | ||
507 | The parameter @var{args} must be a list of strings and is converted into | |
508 | an array of @code{char *}. The array is passed in @var{argv} and its | |
509 | size in @var{argc}. The return value is converted to a Scheme number | |
510 | and returned from the call to @code{dynamic-args-call}. | |
511 | ||
512 | ||
513 | ") | |
1bbd0b84 | 514 | #define FUNC_NAME s_scm_dynamic_args_call |
80bc7890 MV |
515 | { |
516 | int (*fptr) (int argc, char **argv); | |
517 | int result, argc; | |
518 | char **argv; | |
519 | ||
0c95b57d | 520 | if (SCM_ROSTRINGP (func)) |
80bc7890 MV |
521 | func = scm_dynamic_func (func, dobj); |
522 | ||
523 | fptr = (int (*)(int, char **)) scm_num2ulong (func, (char *)SCM_ARG1, | |
1bbd0b84 | 524 | FUNC_NAME); |
419e9e11 | 525 | SCM_DEFER_INTS; |
1bbd0b84 | 526 | argv = scm_make_argv_from_stringlist (args, &argc, FUNC_NAME, |
80bc7890 | 527 | SCM_ARG3); |
80bc7890 | 528 | result = (*fptr) (argc, argv); |
80bc7890 | 529 | scm_must_free_argv (argv); |
419e9e11 MV |
530 | SCM_ALLOW_INTS; |
531 | ||
80bc7890 MV |
532 | return SCM_MAKINUM(0L+result); |
533 | } | |
1bbd0b84 | 534 | #undef FUNC_NAME |
80bc7890 | 535 | |
1edae076 MV |
536 | void |
537 | scm_init_dynamic_linking () | |
538 | { | |
23a62151 MD |
539 | scm_tc16_dynamic_obj = scm_make_smob_type_mfpe ("dynamic-object", sizeof (struct dynl_obj), |
540 | mark_dynl_obj, free_dynl_obj, | |
541 | print_dynl_obj, NULL); | |
80bc7890 MV |
542 | sysdep_dynl_init (); |
543 | #include "dynl.x" | |
8e3ab003 | 544 | kw_global = scm_make_keyword_from_dash_symbol (sym_global); |
1edae076 | 545 | } |