1 /*
2 * Server-side event management
3 *
4 * Copyright (C) 1998 Alexandre Julliard
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
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
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19 */
20
21 #include "config.h"
22 #include "wine/port.h"
23
24 #include <assert.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <stdarg.h>
28
29 #include "ntstatus.h"
30 #define WIN32_NO_STATUS
31 #include "windef.h"
32 #include "winternl.h"
33
34 #include "handle.h"
35 #include "thread.h"
36 #include "request.h"
37 #include "security.h"
38
39 struct event
40 {
41 struct object obj; /* object header */
42 int manual_reset; /* is it a manual reset event? */
43 int signaled; /* event has been signaled */
44 };
45
46 static void event_dump( struct object *obj, int verbose );
47 static struct object_type *event_get_type( struct object *obj );
48 static int event_signaled( struct object *obj, struct thread *thread );
49 static int event_satisfied( struct object *obj, struct thread *thread );
50 static unsigned int event_map_access( struct object *obj, unsigned int access );
51 static int event_signal( struct object *obj, unsigned int access);
52
53 static const struct object_ops event_ops =
54 {
55 sizeof(struct event), /* size */
56 event_dump, /* dump */
57 event_get_type, /* get_type */
58 add_queue, /* add_queue */
59 remove_queue, /* remove_queue */
60 event_signaled, /* signaled */
61 event_satisfied, /* satisfied */
62 event_signal, /* signal */
63 no_get_fd, /* get_fd */
64 event_map_access, /* map_access */
65 default_get_sd, /* get_sd */
66 default_set_sd, /* set_sd */
67 no_lookup_name, /* lookup_name */
68 no_open_file, /* open_file */
69 no_close_handle, /* close_handle */
70 no_destroy /* destroy */
71 };
72
73
74 struct event *create_event( struct directory *root, const struct unicode_str *name,
75 unsigned int attr, int manual_reset, int initial_state,
76 const struct security_descriptor *sd )
77 {
78 struct event *event;
79
80 if ((event = create_named_object_dir( root, name, attr, &event_ops )))
81 {
82 if (get_error() != STATUS_OBJECT_NAME_EXISTS)
83 {
84 /* initialize it if it didn't already exist */
85 event->manual_reset = manual_reset;
86 event->signaled = initial_state;
87 if (sd) default_set_sd( &event->obj, sd, OWNER_SECURITY_INFORMATION|
88 GROUP_SECURITY_INFORMATION|
89 DACL_SECURITY_INFORMATION|
90 SACL_SECURITY_INFORMATION );
91 }
92 }
93 return event;
94 }
95
96 struct event *get_event_obj( struct process *process, obj_handle_t handle, unsigned int access )
97 {
98 return (struct event *)get_handle_obj( process, handle, access, &event_ops );
99 }
100
101 void pulse_event( struct event *event )
102 {
103 event->signaled = 1;
104 /* wake up all waiters if manual reset, a single one otherwise */
105 wake_up( &event->obj, !event->manual_reset );
106 event->signaled = 0;
107 }
108
109 void set_event( struct event *event )
110 {
111 event->signaled = 1;
112 /* wake up all waiters if manual reset, a single one otherwise */
113 wake_up( &event->obj, !event->manual_reset );
114 }
115
116 void reset_event( struct event *event )
117 {
118 event->signaled = 0;
119 }
120
121 static void event_dump( struct object *obj, int verbose )
122 {
123 struct event *event = (struct event *)obj;
124 assert( obj->ops == &event_ops );
125 fprintf( stderr, "Event manual=%d signaled=%d ",
126 event->manual_reset, event->signaled );
127 dump_object_name( &event->obj );
128 fputc( '\n', stderr );
129 }
130
131 static struct object_type *event_get_type( struct object *obj )
132 {
133 static const WCHAR name[] = {'E','v','e','n','t'};
134 static const struct unicode_str str = { name, sizeof(name) };
135 return get_object_type( &str );
136 }
137
138 static int event_signaled( struct object *obj, struct thread *thread )
139 {
140 struct event *event = (struct event *)obj;
141 assert( obj->ops == &event_ops );
142 return event->signaled;
143 }
144
145 static int event_satisfied( struct object *obj, struct thread *thread )
146 {
147 struct event *event = (struct event *)obj;
148 assert( obj->ops == &event_ops );
149 /* Reset if it's an auto-reset event */
150 if (!event->manual_reset) event->signaled = 0;
151 return 0; /* Not abandoned */
152 }
153
154 static unsigned int event_map_access( struct object *obj, unsigned int access )
155 {
156 if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ | SYNCHRONIZE | EVENT_QUERY_STATE;
157 if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE;
158 if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
159 if (access & GENERIC_ALL) access |= STANDARD_RIGHTS_ALL | EVENT_ALL_ACCESS;
160 return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
161 }
162
163 static int event_signal( struct object *obj, unsigned int access )
164 {
165 struct event *event = (struct event *)obj;
166 assert( obj->ops == &event_ops );
167
168 if (!(access & EVENT_MODIFY_STATE))
169 {
170 set_error( STATUS_ACCESS_DENIED );
171 return 0;
172 }
173 set_event( event );
174 return 1;
175 }
176
177 /* create an event */
178 DECL_HANDLER(create_event)
179 {
180 struct event *event;
181 struct unicode_str name;
182 struct directory *root = NULL;
183 const struct object_attributes *objattr = get_req_data();
184 const struct security_descriptor *sd;
185
186 reply->handle = 0;
187
188 if (!objattr_is_valid( objattr, get_req_data_size() ))
189 return;
190
191 sd = objattr->sd_len ? (const struct security_descriptor *)(objattr + 1) : NULL;
192 objattr_get_name( objattr, &name );
193
194 if (objattr->rootdir && !(root = get_directory_obj( current->process, objattr->rootdir, 0 )))
195 return;
196
197 if ((event = create_event( root, &name, req->attributes, req->manual_reset, req->initial_state, sd )))
198 {
199 if (get_error() == STATUS_OBJECT_NAME_EXISTS)
200 reply->handle = alloc_handle( current->process, event, req->access, req->attributes );
201 else
202 reply->handle = alloc_handle_no_access_check( current->process, event, req->access, req->attributes );
203 release_object( event );
204 }
205
206 if (root) release_object( root );
207 }
208
209 /* open a handle to an event */
210 DECL_HANDLER(open_event)
211 {
212 struct unicode_str name;
213 struct directory *root = NULL;
214 struct event *event;
215
216 get_req_unicode_str( &name );
217 if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
218 return;
219
220 if ((event = open_object_dir( root, &name, req->attributes, &event_ops )))
221 {
222 reply->handle = alloc_handle( current->process, &event->obj, req->access, req->attributes );
223 release_object( event );
224 }
225
226 if (root) release_object( root );
227 }
228
229 /* do an event operation */
230 DECL_HANDLER(event_op)
231 {
232 struct event *event;
233
234 if (!(event = get_event_obj( current->process, req->handle, EVENT_MODIFY_STATE ))) return;
235 switch(req->op)
236 {
237 case PULSE_EVENT:
238 pulse_event( event );
239 break;
240 case SET_EVENT:
241 set_event( event );
242 break;
243 case RESET_EVENT:
244 reset_event( event );
245 break;
246 default:
247 set_error( STATUS_INVALID_PARAMETER );
248 break;
249 }
250 release_object( event );
251 }
252
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