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1edae076 MV |
1 | /* dynl.c - dynamic linking |
2 | * | |
4d3526d0 | 3 | * Copyright (C) 1990, 91, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002, |
e66ff09a | 4 | * 2003, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
1edae076 | 5 | * |
73be1d9e | 6 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
7 | * modify it under the terms of the GNU Lesser General Public License |
8 | * as published by the Free Software Foundation; either version 3 of | |
9 | * the License, or (at your option) any later version. | |
1edae076 | 10 | * |
53befeb7 NJ |
11 | * This library is distributed in the hope that it will be useful, but |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
73be1d9e MV |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | * Lesser General Public License for more details. | |
1edae076 | 15 | * |
73be1d9e MV |
16 | * You should have received a copy of the GNU Lesser General Public |
17 | * License along with this library; if not, write to the Free Software | |
53befeb7 NJ |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
19 | * 02110-1301 USA | |
73be1d9e | 20 | */ |
1edae076 | 21 | |
1bbd0b84 GB |
22 | |
23 | ||
dbb605f5 LC |
24 | #ifdef HAVE_CONFIG_H |
25 | # include <config.h> | |
26 | #endif | |
27 | ||
e66ff09a LC |
28 | #include <alloca.h> |
29 | ||
1edae076 MV |
30 | /* "dynl.c" dynamically link&load object files. |
31 | Author: Aubrey Jaffer | |
32 | Modified for libguile by Marius Vollmer */ | |
33 | ||
104d4533 | 34 | #if 0 /* Disabled until we know for sure that it isn't needed */ |
80bc7890 MV |
35 | /* XXX - This is only here to drag in a definition of __eprintf. This |
36 | is needed for proper operation of dynamic linking. The real | |
37 | solution would probably be a shared libgcc. */ | |
38 | ||
39 | #undef NDEBUG | |
40 | #include <assert.h> | |
41 | ||
42 | static void | |
43 | maybe_drag_in_eprintf () | |
44 | { | |
45 | assert (!maybe_drag_in_eprintf); | |
46 | } | |
104d4533 | 47 | #endif |
80bc7890 | 48 | |
e66ff09a | 49 | #include <stdlib.h> |
96599e6a | 50 | #include <stdio.h> |
13070bd3 DH |
51 | #include <string.h> |
52 | ||
a0599745 | 53 | #include "libguile/_scm.h" |
eb350124 | 54 | #include "libguile/libpath.h" |
a0599745 MD |
55 | #include "libguile/dynl.h" |
56 | #include "libguile/smob.h" | |
57 | #include "libguile/keywords.h" | |
58 | #include "libguile/ports.h" | |
59 | #include "libguile/strings.h" | |
a0e0793f | 60 | #include "libguile/deprecation.h" |
a0599745 | 61 | #include "libguile/validate.h" |
7f9994d9 | 62 | #include "libguile/dynwind.h" |
e773b1e6 | 63 | #include "libguile/foreign.h" |
408ea28a | 64 | |
a8255dca | 65 | #include <ltdl.h> |
4feb69af | 66 | |
c2cbcc57 HWN |
67 | /* |
68 | From the libtool manual: "Note that libltdl is not threadsafe, | |
69 | i.e. a multithreaded application has to use a mutex for libltdl.". | |
70 | ||
9de87eea MV |
71 | Guile does not currently support pre-emptive threads, so there is no |
72 | mutex. Previously SCM_CRITICAL_SECTION_START and | |
73 | SCM_CRITICAL_SECTION_END were used: they are mentioned here in case | |
74 | somebody is grepping for thread problems ;) | |
732b9327 | 75 | */ |
e45947bf | 76 | /* njrev: not threadsafe, protection needed as described above */ |
732b9327 | 77 | |
4feb69af | 78 | static void * |
af45e3b0 | 79 | sysdep_dynl_link (const char *fname, const char *subr) |
4feb69af | 80 | { |
a8255dca | 81 | lt_dlhandle handle; |
d12f974b LC |
82 | |
83 | if (fname != NULL) | |
84 | handle = lt_dlopenext (fname); | |
85 | else | |
86 | /* Return a handle for the program as a whole. */ | |
87 | handle = lt_dlopen (NULL); | |
88 | ||
4feb69af MV |
89 | if (NULL == handle) |
90 | { | |
01449aa5 DH |
91 | SCM fn; |
92 | SCM msg; | |
93 | ||
d12f974b | 94 | fn = fname != NULL ? scm_from_locale_string (fname) : SCM_BOOL_F; |
a8255dca | 95 | msg = scm_from_locale_string (lt_dlerror ()); |
1afff620 | 96 | scm_misc_error (subr, "file: ~S, message: ~S", scm_list_2 (fn, msg)); |
4feb69af | 97 | } |
d12f974b | 98 | |
4feb69af MV |
99 | return (void *) handle; |
100 | } | |
101 | ||
102 | static void | |
103 | sysdep_dynl_unlink (void *handle, const char *subr) | |
104 | { | |
a8255dca | 105 | if (lt_dlclose ((lt_dlhandle) handle)) |
4feb69af | 106 | { |
a8255dca | 107 | scm_misc_error (subr, (char *) lt_dlerror (), SCM_EOL); |
4feb69af MV |
108 | } |
109 | } | |
110 | ||
111 | static void * | |
52fd9639 | 112 | sysdep_dynl_value (const char *symb, void *handle, const char *subr) |
4feb69af MV |
113 | { |
114 | void *fptr; | |
115 | ||
a8255dca | 116 | fptr = lt_dlsym ((lt_dlhandle) handle, symb); |
4feb69af | 117 | if (!fptr) |
0f1fd214 MG |
118 | scm_misc_error (subr, "Symbol not found: ~a", |
119 | scm_list_1 (scm_from_locale_string (symb))); | |
4feb69af MV |
120 | return fptr; |
121 | } | |
122 | ||
e66ff09a LC |
123 | /* Augment environment variable VARIABLE with VALUE, assuming VARIABLE |
124 | is a path kind of variable. */ | |
125 | static void | |
126 | augment_env (const char *variable, const char *value) | |
127 | { | |
128 | const char *env; | |
129 | ||
130 | env = getenv (variable); | |
131 | if (env != NULL) | |
132 | { | |
133 | char *new_value; | |
134 | static const char path_sep[] = { LT_PATHSEP_CHAR, 0 }; | |
135 | ||
136 | new_value = alloca (strlen (env) + strlen (value) + 2); | |
137 | strcpy (new_value, env); | |
138 | strcat (new_value, path_sep); | |
139 | strcat (new_value, value); | |
140 | ||
141 | setenv (variable, new_value, 1); | |
142 | } | |
143 | else | |
144 | setenv (variable, value, 1); | |
145 | } | |
146 | ||
4feb69af MV |
147 | static void |
148 | sysdep_dynl_init () | |
149 | { | |
eb350124 AW |
150 | char *env; |
151 | ||
a8255dca | 152 | lt_dlinit (); |
eb350124 | 153 | |
28af5ee5 | 154 | env = getenv ("GUILE_SYSTEM_EXTENSIONS_PATH"); |
eb350124 AW |
155 | if (env && strcmp (env, "") == 0) |
156 | /* special-case interpret system-ltdl-path=="" as meaning no system path, | |
157 | which is the case during the build */ | |
e66ff09a | 158 | ; |
eb350124 | 159 | else if (env) |
28af5ee5 AW |
160 | /* FIXME: should this be a colon-separated path? Or is the only point to |
161 | allow the build system to turn off the installed extensions path? */ | |
eb350124 | 162 | lt_dladdsearchdir (env); |
eb350124 | 163 | else |
28af5ee5 | 164 | { |
e66ff09a LC |
165 | /* Add SCM_LIB_DIR and SCM_EXTENSIONS_DIR to the loader's search |
166 | path. `lt_dladdsearchdir' and $LTDL_LIBRARY_PATH can't be used | |
167 | for that because they are searched before the system-dependent | |
168 | search path, which is the one `libtool --mode=execute -dlopen' | |
169 | fiddles with (info "(libtool) Libltdl Interface"). See | |
170 | <http://lists.gnu.org/archive/html/guile-devel/2010-11/msg00095.html> | |
171 | for details. */ | |
172 | augment_env (SHARED_LIBRARY_PATH_VARIABLE, SCM_LIB_DIR); | |
173 | augment_env (SHARED_LIBRARY_PATH_VARIABLE, SCM_EXTENSIONS_DIR); | |
28af5ee5 | 174 | } |
4feb69af MV |
175 | } |
176 | ||
92c2555f | 177 | scm_t_bits scm_tc16_dynamic_obj; |
80bc7890 | 178 | |
f5710d53 MV |
179 | #define DYNL_FILENAME SCM_SMOB_OBJECT |
180 | #define DYNL_HANDLE(x) ((void *) SCM_SMOB_DATA_2 (x)) | |
2ff08405 | 181 | #define SET_DYNL_HANDLE(x, v) (SCM_SET_SMOB_DATA_2 ((x), (scm_t_bits) (v))) |
7cf1a27e | 182 | |
7cf1a27e | 183 | |
e841c3e0 | 184 | |
80bc7890 | 185 | static int |
e841c3e0 | 186 | dynl_obj_print (SCM exp, SCM port, scm_print_state *pstate) |
80bc7890 | 187 | { |
7cf1a27e MD |
188 | scm_puts ("#<dynamic-object ", port); |
189 | scm_iprin1 (DYNL_FILENAME (exp), port, pstate); | |
190 | if (DYNL_HANDLE (exp) == NULL) | |
191 | scm_puts (" (unlinked)", port); | |
192 | scm_putc ('>', port); | |
193 | return 1; | |
80bc7890 MV |
194 | } |
195 | ||
8e3ab003 | 196 | |
d12f974b | 197 | SCM_DEFINE (scm_dynamic_link, "dynamic-link", 0, 1, 0, |
1e6808ea | 198 | (SCM filename), |
ee95d597 GH |
199 | "Find the shared object (shared library) denoted by\n" |
200 | "@var{filename} and link it into the running Guile\n" | |
201 | "application. The returned\n" | |
202 | "scheme object is a ``handle'' for the library which can\n" | |
203 | "be passed to @code{dynamic-func}, @code{dynamic-call} etc.\n\n" | |
204 | "Searching for object files is system dependent. Normally,\n" | |
205 | "if @var{filename} does have an explicit directory it will\n" | |
206 | "be searched for in locations\n" | |
d12f974b LC |
207 | "such as @file{/usr/lib} and @file{/usr/local/lib}.\n\n" |
208 | "When @var{filename} is omitted, a @dfn{global symbol handle} is\n" | |
209 | "returned. This handle provides access to the symbols\n" | |
210 | "available to the program at run-time, including those exported\n" | |
211 | "by the program itself and the shared libraries already loaded.\n") | |
1bbd0b84 | 212 | #define FUNC_NAME s_scm_dynamic_link |
80bc7890 | 213 | { |
7cf1a27e | 214 | void *handle; |
7f9994d9 | 215 | char *file; |
80bc7890 | 216 | |
661ae7ab | 217 | scm_dynwind_begin (0); |
d12f974b LC |
218 | |
219 | if (SCM_UNBNDP (filename)) | |
220 | file = NULL; | |
221 | else | |
222 | { | |
223 | file = scm_to_locale_string (filename); | |
224 | scm_dynwind_free (file); | |
225 | } | |
226 | ||
7f9994d9 | 227 | handle = sysdep_dynl_link (file, FUNC_NAME); |
661ae7ab | 228 | scm_dynwind_end (); |
d12f974b LC |
229 | |
230 | SCM_RETURN_NEWSMOB2 (scm_tc16_dynamic_obj, | |
231 | SCM_UNBNDP (filename) | |
232 | ? SCM_UNPACK (SCM_BOOL_F) : SCM_UNPACK (filename), | |
233 | handle); | |
80bc7890 | 234 | } |
1bbd0b84 | 235 | #undef FUNC_NAME |
80bc7890 | 236 | |
80bc7890 | 237 | |
a1ec6916 | 238 | SCM_DEFINE (scm_dynamic_object_p, "dynamic-object?", 1, 0, 0, |
1bbd0b84 | 239 | (SCM obj), |
ee95d597 GH |
240 | "Return @code{#t} if @var{obj} is a dynamic object handle,\n" |
241 | "or @code{#f} otherwise.") | |
1bbd0b84 | 242 | #define FUNC_NAME s_scm_dynamic_object_p |
80bc7890 | 243 | { |
7888309b | 244 | return scm_from_bool (SCM_TYP16_PREDICATE (scm_tc16_dynamic_obj, obj)); |
80bc7890 | 245 | } |
1bbd0b84 | 246 | #undef FUNC_NAME |
80bc7890 | 247 | |
b82c6ce0 | 248 | |
a1ec6916 | 249 | SCM_DEFINE (scm_dynamic_unlink, "dynamic-unlink", 1, 0, 0, |
1bbd0b84 | 250 | (SCM dobj), |
ee95d597 GH |
251 | "Unlink a dynamic object from the application, if possible. The\n" |
252 | "object must have been linked by @code{dynamic-link}, with \n" | |
253 | "@var{dobj} the corresponding handle. After this procedure\n" | |
254 | "is called, the handle can no longer be used to access the\n" | |
255 | "object.") | |
1bbd0b84 | 256 | #define FUNC_NAME s_scm_dynamic_unlink |
80bc7890 | 257 | { |
7cf1a27e | 258 | /*fixme* GC-problem */ |
b82c6ce0 DH |
259 | SCM_VALIDATE_SMOB (SCM_ARG1, dobj, dynamic_obj); |
260 | if (DYNL_HANDLE (dobj) == NULL) { | |
9e375910 | 261 | SCM_MISC_ERROR ("Already unlinked: ~S", scm_list_1 (dobj)); |
b82c6ce0 | 262 | } else { |
b82c6ce0 DH |
263 | sysdep_dynl_unlink (DYNL_HANDLE (dobj), FUNC_NAME); |
264 | SET_DYNL_HANDLE (dobj, NULL); | |
b82c6ce0 DH |
265 | return SCM_UNSPECIFIED; |
266 | } | |
80bc7890 | 267 | } |
1bbd0b84 | 268 | #undef FUNC_NAME |
80bc7890 | 269 | |
b82c6ce0 | 270 | |
d4149a51 LC |
271 | SCM_DEFINE (scm_dynamic_pointer, "dynamic-pointer", 2, 0, 0, |
272 | (SCM name, SCM dobj), | |
183a2a22 LC |
273 | "Return a ``wrapped pointer'' to the symbol @var{name}\n" |
274 | "in the shared object referred to by @var{dobj}. The returned\n" | |
275 | "pointer points to a C object.\n\n" | |
ee95d597 GH |
276 | "Regardless whether your C compiler prepends an underscore\n" |
277 | "@samp{_} to the global names in a program, you should\n" | |
278 | "@strong{not} include this underscore in @var{name}\n" | |
279 | "since it will be added automatically when necessary.") | |
52fd9639 | 280 | #define FUNC_NAME s_scm_dynamic_pointer |
80bc7890 | 281 | { |
52fd9639 | 282 | void *val; |
80bc7890 | 283 | |
a6d9e5ab | 284 | SCM_VALIDATE_STRING (1, name); |
d4149a51 | 285 | SCM_VALIDATE_SMOB (SCM_ARG2, dobj, dynamic_obj); |
3023e7b0 LC |
286 | |
287 | if (DYNL_HANDLE (dobj) == NULL) | |
b82c6ce0 | 288 | SCM_MISC_ERROR ("Already unlinked: ~S", dobj); |
3023e7b0 LC |
289 | else |
290 | { | |
291 | char *chars; | |
292 | ||
293 | scm_dynwind_begin (0); | |
294 | chars = scm_to_locale_string (name); | |
295 | scm_dynwind_free (chars); | |
296 | val = sysdep_dynl_value (chars, DYNL_HANDLE (dobj), FUNC_NAME); | |
297 | scm_dynwind_end (); | |
298 | ||
5b46a8c2 | 299 | return scm_from_pointer (val, NULL); |
3023e7b0 | 300 | } |
80bc7890 | 301 | } |
1bbd0b84 | 302 | #undef FUNC_NAME |
80bc7890 | 303 | |
b82c6ce0 | 304 | |
52fd9639 AW |
305 | SCM_DEFINE (scm_dynamic_func, "dynamic-func", 2, 0, 0, |
306 | (SCM name, SCM dobj), | |
307 | "Return a ``handle'' for the function @var{name} in the\n" | |
308 | "shared object referred to by @var{dobj}. The handle\n" | |
309 | "can be passed to @code{dynamic-call} to actually\n" | |
310 | "call the function.\n\n" | |
311 | "Regardless whether your C compiler prepends an underscore\n" | |
312 | "@samp{_} to the global names in a program, you should\n" | |
313 | "@strong{not} include this underscore in @var{name}\n" | |
314 | "since it will be added automatically when necessary.") | |
315 | #define FUNC_NAME s_scm_dynamic_func | |
316 | { | |
d4149a51 | 317 | return scm_dynamic_pointer (name, dobj); |
52fd9639 AW |
318 | } |
319 | #undef FUNC_NAME | |
320 | ||
321 | ||
a1ec6916 | 322 | SCM_DEFINE (scm_dynamic_call, "dynamic-call", 2, 0, 0, |
1bbd0b84 | 323 | (SCM func, SCM dobj), |
46732b54 GH |
324 | "Call a C function in a dynamic object. Two styles of\n" |
325 | "invocation are supported:\n\n" | |
326 | "@itemize @bullet\n" | |
327 | "@item @var{func} can be a function handle returned by\n" | |
328 | "@code{dynamic-func}. In this case @var{dobj} is\n" | |
329 | "ignored\n" | |
330 | "@item @var{func} can be a string with the name of the\n" | |
331 | "function to call, with @var{dobj} the handle of the\n" | |
332 | "dynamic object in which to find the function.\n" | |
333 | "This is equivalent to\n" | |
334 | "@smallexample\n\n" | |
335 | "(dynamic-call (dynamic-func @var{func} @var{dobj}) #f)\n" | |
336 | "@end smallexample\n" | |
337 | "@end itemize\n\n" | |
338 | "In either case, the function is passed no arguments\n" | |
339 | "and its return value is ignored.") | |
1bbd0b84 | 340 | #define FUNC_NAME s_scm_dynamic_call |
80bc7890 | 341 | { |
5b46a8c2 LC |
342 | void (*fptr) (void); |
343 | ||
7f9994d9 | 344 | if (scm_is_string (func)) |
7cf1a27e | 345 | func = scm_dynamic_func (func, dobj); |
5b46a8c2 | 346 | SCM_VALIDATE_POINTER (SCM_ARG1, func); |
e773b1e6 | 347 | |
5b46a8c2 | 348 | fptr = SCM_POINTER_VALUE (func); |
7cf1a27e | 349 | fptr (); |
7cf1a27e | 350 | return SCM_UNSPECIFIED; |
80bc7890 | 351 | } |
1bbd0b84 | 352 | #undef FUNC_NAME |
80bc7890 | 353 | |
1edae076 MV |
354 | void |
355 | scm_init_dynamic_linking () | |
356 | { | |
7cf1a27e | 357 | scm_tc16_dynamic_obj = scm_make_smob_type ("dynamic-object", 0); |
e841c3e0 | 358 | scm_set_smob_print (scm_tc16_dynamic_obj, dynl_obj_print); |
7cf1a27e | 359 | sysdep_dynl_init (); |
a0599745 | 360 | #include "libguile/dynl.x" |
1edae076 | 361 | } |
89e00824 ML |
362 | |
363 | /* | |
364 | Local Variables: | |
365 | c-file-style: "gnu" | |
366 | End: | |
367 | */ |