1/* GObject - GLib Type, Object, Parameter and Signal Library
2 * Copyright (C) 2001 Red Hat, Inc.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * This library 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 GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General
15 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
16 */
17
18#include "config.h"
19
20#include "gsourceclosure.h"
21#include "gboxed.h"
22#include "genums.h"
23#include "gmarshal.h"
24#include "gvalue.h"
25#include "gvaluetypes.h"
26#ifdef G_OS_UNIX
27#include "glib-unix.h"
28#endif
29
30G_DEFINE_BOXED_TYPE (GIOChannel, g_io_channel, g_io_channel_ref, g_io_channel_unref)
31
32GType
33g_io_condition_get_type (void)
34{
35 static GType etype = 0;
36
37 if (g_once_init_enter (&etype))
38 {
39 static const GFlagsValue values[] = {
40 { G_IO_IN, "G_IO_IN", "in" },
41 { G_IO_OUT, "G_IO_OUT", "out" },
42 { G_IO_PRI, "G_IO_PRI", "pri" },
43 { G_IO_ERR, "G_IO_ERR", "err" },
44 { G_IO_HUP, "G_IO_HUP", "hup" },
45 { G_IO_NVAL, "G_IO_NVAL", "nval" },
46 { 0, NULL, NULL }
47 };
48 GType type_id = g_flags_register_static (name: "GIOCondition", const_static_values: values);
49 g_once_init_leave (&etype, type_id);
50 }
51 return etype;
52}
53
54/* We need to hand-write this marshaler, since it doesn't have an
55 * instance object.
56 */
57static void
58source_closure_marshal_BOOLEAN__VOID (GClosure *closure,
59 GValue *return_value,
60 guint n_param_values,
61 const GValue *param_values,
62 gpointer invocation_hint,
63 gpointer marshal_data)
64{
65 GSourceFunc callback;
66 GCClosure *cc = (GCClosure*) closure;
67 gboolean v_return;
68
69 g_return_if_fail (return_value != NULL);
70 g_return_if_fail (n_param_values == 0);
71
72 callback = (GSourceFunc) (marshal_data ? marshal_data : cc->callback);
73
74 v_return = callback (closure->data);
75
76 g_value_set_boolean (value: return_value, v_boolean: v_return);
77}
78
79static gboolean
80io_watch_closure_callback (GIOChannel *channel,
81 GIOCondition condition,
82 gpointer data)
83{
84 GClosure *closure = data;
85
86 GValue params[2] = { G_VALUE_INIT, G_VALUE_INIT };
87 GValue result_value = G_VALUE_INIT;
88 gboolean result;
89
90 g_value_init (value: &result_value, G_TYPE_BOOLEAN);
91 g_value_init (value: &params[0], G_TYPE_IO_CHANNEL);
92 g_value_set_boxed (value: &params[0], v_boxed: channel);
93
94 g_value_init (value: &params[1], G_TYPE_IO_CONDITION);
95 g_value_set_flags (value: &params[1], v_flags: condition);
96
97 g_closure_invoke (closure, return_value: &result_value, n_param_values: 2, param_values: params, NULL);
98
99 result = g_value_get_boolean (value: &result_value);
100 g_value_unset (value: &result_value);
101 g_value_unset (value: &params[0]);
102 g_value_unset (value: &params[1]);
103
104 return result;
105}
106
107static gboolean
108g_child_watch_closure_callback (GPid pid,
109 gint status,
110 gpointer data)
111{
112 GClosure *closure = data;
113
114 GValue params[2] = { G_VALUE_INIT, G_VALUE_INIT };
115 GValue result_value = G_VALUE_INIT;
116 gboolean result;
117
118 g_value_init (value: &result_value, G_TYPE_BOOLEAN);
119
120#ifdef G_OS_UNIX
121 g_value_init (value: &params[0], G_TYPE_ULONG);
122 g_value_set_ulong (value: &params[0], v_ulong: pid);
123#endif
124#ifdef G_OS_WIN32
125 g_value_init (&params[0], G_TYPE_POINTER);
126 g_value_set_pointer (&params[0], pid);
127#endif
128
129 g_value_init (value: &params[1], G_TYPE_INT);
130 g_value_set_int (value: &params[1], v_int: status);
131
132 g_closure_invoke (closure, return_value: &result_value, n_param_values: 2, param_values: params, NULL);
133
134 result = g_value_get_boolean (value: &result_value);
135 g_value_unset (value: &result_value);
136 g_value_unset (value: &params[0]);
137 g_value_unset (value: &params[1]);
138
139 return result;
140}
141
142#ifdef G_OS_UNIX
143static gboolean
144g_unix_fd_source_closure_callback (int fd,
145 GIOCondition condition,
146 gpointer data)
147{
148 GClosure *closure = data;
149
150 GValue params[2] = { G_VALUE_INIT, G_VALUE_INIT };
151 GValue result_value = G_VALUE_INIT;
152 gboolean result;
153
154 g_value_init (value: &result_value, G_TYPE_BOOLEAN);
155
156 g_value_init (value: &params[0], G_TYPE_INT);
157 g_value_set_int (value: &params[0], v_int: fd);
158
159 g_value_init (value: &params[1], G_TYPE_IO_CONDITION);
160 g_value_set_flags (value: &params[1], v_flags: condition);
161
162 g_closure_invoke (closure, return_value: &result_value, n_param_values: 2, param_values: params, NULL);
163
164 result = g_value_get_boolean (value: &result_value);
165 g_value_unset (value: &result_value);
166 g_value_unset (value: &params[0]);
167 g_value_unset (value: &params[1]);
168
169 return result;
170}
171#endif
172
173static gboolean
174source_closure_callback (gpointer data)
175{
176 GClosure *closure = data;
177 GValue result_value = G_VALUE_INIT;
178 gboolean result;
179
180 g_value_init (value: &result_value, G_TYPE_BOOLEAN);
181
182 g_closure_invoke (closure, return_value: &result_value, n_param_values: 0, NULL, NULL);
183
184 result = g_value_get_boolean (value: &result_value);
185 g_value_unset (value: &result_value);
186
187 return result;
188}
189
190static void
191closure_callback_get (gpointer cb_data,
192 GSource *source,
193 GSourceFunc *func,
194 gpointer *data)
195{
196 GSourceFunc closure_callback = source->source_funcs->closure_callback;
197
198 if (!closure_callback)
199 {
200 if (source->source_funcs == &g_io_watch_funcs)
201 closure_callback = (GSourceFunc)io_watch_closure_callback;
202 else if (source->source_funcs == &g_child_watch_funcs)
203 closure_callback = (GSourceFunc)g_child_watch_closure_callback;
204#ifdef G_OS_UNIX
205 else if (source->source_funcs == &g_unix_fd_source_funcs)
206 closure_callback = (GSourceFunc)g_unix_fd_source_closure_callback;
207#endif
208 else if (source->source_funcs == &g_timeout_funcs ||
209#ifdef G_OS_UNIX
210 source->source_funcs == &g_unix_signal_funcs ||
211#endif
212 source->source_funcs == &g_idle_funcs)
213 closure_callback = source_closure_callback;
214 }
215
216 *func = closure_callback;
217 *data = cb_data;
218}
219
220static GSourceCallbackFuncs closure_callback_funcs = {
221 (void (*) (gpointer)) g_closure_ref,
222 (void (*) (gpointer)) g_closure_unref,
223 closure_callback_get
224};
225
226static void
227closure_invalidated (gpointer user_data,
228 GClosure *closure)
229{
230 g_source_destroy (source: user_data);
231}
232
233/**
234 * g_source_set_closure:
235 * @source: the source
236 * @closure: a #GClosure
237 *
238 * Set the callback for a source as a #GClosure.
239 *
240 * If the source is not one of the standard GLib types, the @closure_callback
241 * and @closure_marshal fields of the #GSourceFuncs structure must have been
242 * filled in with pointers to appropriate functions.
243 */
244void
245g_source_set_closure (GSource *source,
246 GClosure *closure)
247{
248 g_return_if_fail (source != NULL);
249 g_return_if_fail (closure != NULL);
250
251 if (!source->source_funcs->closure_callback &&
252#ifdef G_OS_UNIX
253 source->source_funcs != &g_unix_fd_source_funcs &&
254 source->source_funcs != &g_unix_signal_funcs &&
255#endif
256 source->source_funcs != &g_child_watch_funcs &&
257 source->source_funcs != &g_io_watch_funcs &&
258 source->source_funcs != &g_timeout_funcs &&
259 source->source_funcs != &g_idle_funcs)
260 {
261 g_critical (G_STRLOC ": closure cannot be set on GSource without GSourceFuncs::closure_callback");
262 return;
263 }
264
265 g_closure_ref (closure);
266 g_closure_sink (closure);
267 g_source_set_callback_indirect (source, callback_data: closure, callback_funcs: &closure_callback_funcs);
268
269 g_closure_add_invalidate_notifier (closure, notify_data: source, notify_func: closure_invalidated);
270
271 if (G_CLOSURE_NEEDS_MARSHAL (closure))
272 {
273 GClosureMarshal marshal = (GClosureMarshal)source->source_funcs->closure_marshal;
274 if (marshal)
275 g_closure_set_marshal (closure, marshal);
276 else if (source->source_funcs == &g_idle_funcs ||
277#ifdef G_OS_UNIX
278 source->source_funcs == &g_unix_signal_funcs ||
279#endif
280 source->source_funcs == &g_timeout_funcs)
281 g_closure_set_marshal (closure, marshal: source_closure_marshal_BOOLEAN__VOID);
282 else
283 g_closure_set_marshal (closure, marshal: g_cclosure_marshal_generic);
284 }
285}
286
287static void
288dummy_closure_marshal (GClosure *closure,
289 GValue *return_value,
290 guint n_param_values,
291 const GValue *param_values,
292 gpointer invocation_hint,
293 gpointer marshal_data)
294{
295 if (G_VALUE_HOLDS_BOOLEAN (return_value))
296 g_value_set_boolean (value: return_value, TRUE);
297}
298
299/**
300 * g_source_set_dummy_callback:
301 * @source: the source
302 *
303 * Sets a dummy callback for @source. The callback will do nothing, and
304 * if the source expects a #gboolean return value, it will return %TRUE.
305 * (If the source expects any other type of return value, it will return
306 * a 0/%NULL value; whatever g_value_init() initializes a #GValue to for
307 * that type.)
308 *
309 * If the source is not one of the standard GLib types, the
310 * @closure_callback and @closure_marshal fields of the #GSourceFuncs
311 * structure must have been filled in with pointers to appropriate
312 * functions.
313 */
314void
315g_source_set_dummy_callback (GSource *source)
316{
317 GClosure *closure;
318
319 closure = g_closure_new_simple (sizeof_closure: sizeof (GClosure), NULL);
320 g_closure_set_meta_marshal (closure, NULL, meta_marshal: dummy_closure_marshal);
321 g_source_set_closure (source, closure);
322}
323

source code of gtk/subprojects/glib/gobject/gsourceclosure.c