2 * Copyright (C) 2009-2011 Red Hat Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 (* Please read generator/README first. *)
26 open Generator_docstrings
27 open Generator_optgroups
28 open Generator_actions
29 open Generator_structs
33 (* Generate ruby bindings. *)
34 let rec generate_ruby_c () =
35 generate_header CStyle LGPLv2plus;
44 #include \"guestfs.h\"
46 #include \"extconf.h\"
50 #define RARRAY_LEN(r) (RARRAY((r))->len)
53 static VALUE m_guestfs; /* guestfs module */
54 static VALUE c_guestfs; /* guestfs_h handle */
55 static VALUE e_Error; /* used for all errors */
57 static void ruby_event_callback_wrapper (guestfs_h *g, void *data, uint64_t event, int event_handle, int flags, const char *buf, size_t buf_len, const uint64_t *array, size_t array_len);
58 static VALUE **get_all_event_callbacks (guestfs_h *g, size_t *len_rtn);
60 static void ruby_guestfs_free (void *gvp)
65 /* As in the OCaml binding, there is a nasty, difficult to
66 * solve case here where the user deletes events in one of
67 * the callbacks that we are about to invoke, resulting in
71 VALUE **roots = get_all_event_callbacks (g, &len);
73 /* Close the handle: this could invoke callbacks from the list
74 * above, which is why we don't want to delete them before
79 /* Now unregister the global roots. */
80 for (i = 0; i < len; ++i) {
81 rb_gc_unregister_address (roots[i]);
87 static VALUE ruby_guestfs_create (VALUE m)
91 g = guestfs_create ();
93 rb_raise (e_Error, \"failed to create guestfs handle\");
95 /* Don't print error messages to stderr by default. */
96 guestfs_set_error_handler (g, NULL, NULL);
98 /* Wrap it, and make sure the close function is called when the
101 return Data_Wrap_Struct (c_guestfs, NULL, ruby_guestfs_free, g);
104 static VALUE ruby_guestfs_close (VALUE gv)
107 Data_Get_Struct (gv, guestfs_h, g);
109 ruby_guestfs_free (g);
110 DATA_PTR (gv) = NULL;
116 ruby_set_event_callback (VALUE gv, VALUE cbv, VALUE event_bitmaskv)
119 uint64_t event_bitmask;
124 Data_Get_Struct (gv, guestfs_h, g);
126 event_bitmask = NUM2ULL (event_bitmaskv);
128 root = guestfs_safe_malloc (g, sizeof *root);
131 eh = guestfs_set_event_callback (g, ruby_event_callback_wrapper,
132 event_bitmask, 0, root);
135 rb_raise (e_Error, \"%%s\", guestfs_last_error (g));
138 rb_gc_register_address (root);
140 snprintf (key, sizeof key, \"_ruby_event_%%d\", eh);
141 guestfs_set_private (g, key, root);
147 ruby_delete_event_callback (VALUE gv, VALUE event_handlev)
151 int eh = NUM2INT (event_handlev);
154 Data_Get_Struct (gv, guestfs_h, g);
156 snprintf (key, sizeof key, \"_ruby_event_%%d\", eh);
158 root = guestfs_get_private (g, key);
160 rb_gc_unregister_address (root);
162 guestfs_set_private (g, key, NULL);
163 guestfs_delete_event_callback (g, eh);
170 ruby_event_callback_wrapper (guestfs_h *g,
175 const char *buf, size_t buf_len,
176 const uint64_t *array, size_t array_len)
179 VALUE eventv, event_handlev, bufv, arrayv;
181 eventv = ULL2NUM (event);
182 event_handlev = INT2NUM (event_handle);
184 bufv = rb_str_new (buf, buf_len);
186 arrayv = rb_ary_new2 (array_len);
187 for (i = 0; i < array_len; ++i)
188 rb_ary_push (arrayv, ULL2NUM (array[i]));
190 /* XXX If the Ruby callback raises any sort of exception then
191 * it causes the process to segfault. I don't understand how
192 * to catch exceptions here.
194 rb_funcall (*(VALUE *) data, rb_intern (\"call\"), 4,
195 eventv, event_handlev, bufv, arrayv);
199 get_all_event_callbacks (guestfs_h *g, size_t *len_rtn)
206 /* Count the length of the array that will be needed. */
208 root = guestfs_first_private (g, &key);
209 while (root != NULL) {
210 if (strncmp (key, \"_ruby_event_\", strlen (\"_ruby_event_\")) == 0)
212 root = guestfs_next_private (g, &key);
215 /* Copy them into the return array. */
216 r = guestfs_safe_malloc (g, sizeof (VALUE *) * (*len_rtn));
219 root = guestfs_first_private (g, &key);
220 while (root != NULL) {
221 if (strncmp (key, \"_ruby_event_\", strlen (\"_ruby_event_\")) == 0) {
225 root = guestfs_next_private (g, &key);
234 fun (name, (ret, args, optargs as style), _, _, _, _, _) ->
235 pr "static VALUE ruby_guestfs_%s (VALUE gv" name;
236 List.iter (fun arg -> pr ", VALUE %sv" (name_of_argt arg)) args;
237 (* XXX This makes the hash mandatory, meaning that you have
238 * to specify {} for no arguments. We could make it so this
239 * can be omitted. However that is a load of hassle because
240 * you have to completely change the way that arguments are
242 * http://www.redhat.com/archives/libvir-list/2008-April/msg00004.html
244 if optargs <> [] then
245 pr ", VALUE optargsv";
248 pr " guestfs_h *g;\n";
249 pr " Data_Get_Struct (gv, guestfs_h, g);\n";
251 pr " rb_raise (rb_eArgError, \"%%s: used handle after closing it\", \"%s\");\n"
257 | Pathname n | Device n | Dev_or_Path n | String n | Key n
258 | FileIn n | FileOut n ->
259 pr " Check_Type (%sv, T_STRING);\n" n;
260 pr " const char *%s = StringValueCStr (%sv);\n" n n;
262 pr " rb_raise (rb_eTypeError, \"expected string for parameter %%s of %%s\",\n";
263 pr " \"%s\", \"%s\");\n" n name
265 pr " Check_Type (%sv, T_STRING);\n" n;
266 pr " const char *%s = RSTRING (%sv)->ptr;\n" n n;
268 pr " rb_raise (rb_eTypeError, \"expected string for parameter %%s of %%s\",\n";
269 pr " \"%s\", \"%s\");\n" n name;
270 pr " size_t %s_size = RSTRING (%sv)->len;\n" n n
272 pr " const char *%s = !NIL_P (%sv) ? StringValueCStr (%sv) : NULL;\n" n n n
273 | StringList n | DeviceList n ->
274 pr " char **%s;\n" n;
275 pr " Check_Type (%sv, T_ARRAY);\n" n;
277 pr " size_t i, len;\n";
278 pr " len = RARRAY_LEN (%sv);\n" n;
279 pr " %s = guestfs_safe_malloc (g, sizeof (char *) * (len+1));\n"
281 pr " for (i = 0; i < len; ++i) {\n";
282 pr " VALUE v = rb_ary_entry (%sv, i);\n" n;
283 pr " %s[i] = StringValueCStr (v);\n" n;
285 pr " %s[len] = NULL;\n" n;
288 pr " int %s = RTEST (%sv);\n" n n
290 pr " int %s = NUM2INT (%sv);\n" n n
292 pr " long long %s = NUM2LL (%sv);\n" n n
294 pr " %s %s = (%s) (intptr_t) NUM2LL (%sv);\n" t n t n
298 (* Optional arguments are passed in a final hash parameter. *)
299 if optargs <> [] then (
300 let uc_name = String.uppercase name in
301 pr " Check_Type (optargsv, T_HASH);\n";
302 pr " struct guestfs_%s_argv optargs_s = { .bitmask = 0 };\n" name;
303 pr " struct guestfs_%s_argv *optargs = &optargs_s;\n" name;
307 let n = name_of_argt argt in
308 let uc_n = String.uppercase n in
309 pr " v = rb_hash_lookup (optargsv, ID2SYM (rb_intern (\"%s\")));\n" n;
310 pr " if (v != Qnil) {\n";
313 pr " optargs_s.%s = RTEST (v);\n" n;
315 pr " optargs_s.%s = NUM2INT (v);\n" n;
317 pr " optargs_s.%s = NUM2LL (v);\n" n;
319 pr " Check_Type (v, T_STRING);\n";
320 pr " optargs_s.%s = StringValueCStr (v);\n" n
323 pr " optargs_s.bitmask |= GUESTFS_%s_%s_BITMASK;\n" uc_name uc_n;
330 | RErr | RInt _ | RBool _ -> pr " int r;\n"
331 | RInt64 _ -> pr " int64_t r;\n"
332 | RConstString _ | RConstOptString _ ->
333 pr " const char *r;\n"
334 | RString _ -> pr " char *r;\n"
335 | RStringList _ | RHashtable _ -> pr " char **r;\n"
336 | RStruct (_, typ) -> pr " struct guestfs_%s *r;\n" typ
337 | RStructList (_, typ) ->
338 pr " struct guestfs_%s_list *r;\n" typ
346 pr " r = guestfs_%s " name
348 pr " r = guestfs_%s_argv " name;
349 generate_c_call_args ~handle:"g" style;
354 | Pathname _ | Device _ | Dev_or_Path _ | String _ | Key _
355 | FileIn _ | FileOut _ | OptString _ | Bool _ | Int _ | Int64 _
356 | BufferIn _ | Pointer _ -> ()
357 | StringList n | DeviceList n ->
361 (match errcode_of_ret ret with
362 | `CannotReturnError -> ()
363 | `ErrorIsMinusOne ->
364 pr " if (r == -1)\n";
365 pr " rb_raise (e_Error, \"%%s\", guestfs_last_error (g));\n"
367 pr " if (r == NULL)\n";
368 pr " rb_raise (e_Error, \"%%s\", guestfs_last_error (g));\n"
375 | RInt _ | RBool _ ->
376 pr " return INT2NUM (r);\n"
378 pr " return ULL2NUM (r);\n"
380 pr " return rb_str_new2 (r);\n";
381 | RConstOptString _ ->
383 pr " return rb_str_new2 (r);\n";
385 pr " return Qnil;\n";
387 pr " VALUE rv = rb_str_new2 (r);\n";
391 pr " size_t i, len = 0;\n";
392 pr " for (i = 0; r[i] != NULL; ++i) len++;\n";
393 pr " VALUE rv = rb_ary_new2 (len);\n";
394 pr " for (i = 0; r[i] != NULL; ++i) {\n";
395 pr " rb_ary_push (rv, rb_str_new2 (r[i]));\n";
396 pr " free (r[i]);\n";
400 | RStruct (_, typ) ->
401 let cols = cols_of_struct typ in
402 generate_ruby_struct_code typ cols
403 | RStructList (_, typ) ->
404 let cols = cols_of_struct typ in
405 generate_ruby_struct_list_code typ cols
407 pr " VALUE rv = rb_hash_new ();\n";
409 pr " for (i = 0; r[i] != NULL; i+=2) {\n";
410 pr " rb_hash_aset (rv, rb_str_new2 (r[i]), rb_str_new2 (r[i+1]));\n";
411 pr " free (r[i]);\n";
412 pr " free (r[i+1]);\n";
417 pr " VALUE rv = rb_str_new (r, size);\n";
427 /* Initialize the module. */
428 void Init__guestfs ()
430 m_guestfs = rb_define_module (\"Guestfs\");
431 c_guestfs = rb_define_class_under (m_guestfs, \"Guestfs\", rb_cObject);
432 e_Error = rb_define_class_under (m_guestfs, \"Error\", rb_eStandardError);
434 #ifdef HAVE_RB_DEFINE_ALLOC_FUNC
435 rb_define_alloc_func (c_guestfs, ruby_guestfs_create);
438 rb_define_module_function (m_guestfs, \"create\", ruby_guestfs_create, 0);
439 rb_define_method (c_guestfs, \"close\", ruby_guestfs_close, 0);
440 rb_define_method (c_guestfs, \"set_event_callback\",
441 ruby_set_event_callback, 2);
442 rb_define_method (c_guestfs, \"delete_event_callback\",
443 ruby_delete_event_callback, 1);
449 fun (name, bitmask) ->
450 pr " rb_define_const (m_guestfs, \"EVENT_%s\",\n"
451 (String.uppercase name);
452 pr " ULL2NUM (UINT64_C (0x%x)));\n" bitmask;
458 fun (name, (_, args, optargs), _, _, _, _, _) ->
459 let nr_args = List.length args + if optargs <> [] then 1 else 0 in
460 pr " rb_define_method (c_guestfs, \"%s\",\n" name;
461 pr " ruby_guestfs_%s, %d);\n" name nr_args
466 (* Ruby code to return a struct. *)
467 and generate_ruby_struct_code typ cols =
468 pr " VALUE rv = rb_hash_new ();\n";
472 pr " rb_hash_aset (rv, rb_str_new2 (\"%s\"), rb_str_new2 (r->%s));\n" name name
474 pr " rb_hash_aset (rv, rb_str_new2 (\"%s\"), rb_str_new (r->%s, r->%s_len));\n" name name name
476 pr " rb_hash_aset (rv, rb_str_new2 (\"%s\"), rb_str_new (r->%s, 32));\n" name name
477 | name, (FBytes|FUInt64) ->
478 pr " rb_hash_aset (rv, rb_str_new2 (\"%s\"), ULL2NUM (r->%s));\n" name name
480 pr " rb_hash_aset (rv, rb_str_new2 (\"%s\"), LL2NUM (r->%s));\n" name name
482 pr " rb_hash_aset (rv, rb_str_new2 (\"%s\"), UINT2NUM (r->%s));\n" name name
484 pr " rb_hash_aset (rv, rb_str_new2 (\"%s\"), INT2NUM (r->%s));\n" name name
485 | name, FOptPercent ->
486 pr " rb_hash_aset (rv, rb_str_new2 (\"%s\"), rb_dbl2big (r->%s));\n" name name
487 | name, FChar -> (* XXX wrong? *)
488 pr " rb_hash_aset (rv, rb_str_new2 (\"%s\"), ULL2NUM (r->%s));\n" name name
490 pr " guestfs_free_%s (r);\n" typ;
493 (* Ruby code to return a struct list. *)
494 and generate_ruby_struct_list_code typ cols =
495 pr " VALUE rv = rb_ary_new2 (r->len);\n";
497 pr " for (i = 0; i < r->len; ++i) {\n";
498 pr " VALUE hv = rb_hash_new ();\n";
502 pr " rb_hash_aset (hv, rb_str_new2 (\"%s\"), rb_str_new2 (r->val[i].%s));\n" name name
504 pr " rb_hash_aset (hv, rb_str_new2 (\"%s\"), rb_str_new (r->val[i].%s, r->val[i].%s_len));\n" name name name
506 pr " rb_hash_aset (hv, rb_str_new2 (\"%s\"), rb_str_new (r->val[i].%s, 32));\n" name name
507 | name, (FBytes|FUInt64) ->
508 pr " rb_hash_aset (hv, rb_str_new2 (\"%s\"), ULL2NUM (r->val[i].%s));\n" name name
510 pr " rb_hash_aset (hv, rb_str_new2 (\"%s\"), LL2NUM (r->val[i].%s));\n" name name
512 pr " rb_hash_aset (hv, rb_str_new2 (\"%s\"), UINT2NUM (r->val[i].%s));\n" name name
514 pr " rb_hash_aset (hv, rb_str_new2 (\"%s\"), INT2NUM (r->val[i].%s));\n" name name
515 | name, FOptPercent ->
516 pr " rb_hash_aset (hv, rb_str_new2 (\"%s\"), rb_dbl2big (r->val[i].%s));\n" name name
517 | name, FChar -> (* XXX wrong? *)
518 pr " rb_hash_aset (hv, rb_str_new2 (\"%s\"), ULL2NUM (r->val[i].%s));\n" name name
520 pr " rb_ary_push (rv, hv);\n";
522 pr " guestfs_free_%s_list (r);\n" typ;