server/event.c

   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 wait_queue_entry *entry );
  49 static void event_satisfied( struct object *obj, struct wait_queue_entry *entry );
  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 keyed_event
  75 {
  76     struct object  obj;             /* object header */
  77 };
  78
  79 static void keyed_event_dump( struct object *obj, int verbose );
  80 static struct object_type *keyed_event_get_type( struct object *obj );
  81 static int keyed_event_signaled( struct object *obj, struct wait_queue_entry *entry );
  82 static unsigned int keyed_event_map_access( struct object *obj, unsigned int access );
  83
  84 static const struct object_ops keyed_event_ops =
  85 {
  86     sizeof(struct keyed_event),  /* size */
  87     keyed_event_dump,            /* dump */
  88     keyed_event_get_type,        /* get_type */
  89     add_queue,                   /* add_queue */
  90     remove_queue,                /* remove_queue */
  91     keyed_event_signaled,        /* signaled */
  92     no_satisfied,                /* satisfied */
  93     no_signal,                   /* signal */
  94     no_get_fd,                   /* get_fd */
  95     keyed_event_map_access,      /* map_access */
  96     default_get_sd,              /* get_sd */
  97     default_set_sd,              /* set_sd */
  98     no_lookup_name,              /* lookup_name */
  99     no_open_file,                /* open_file */
 100     no_close_handle,             /* close_handle */
 101     no_destroy                   /* destroy */
 102 };
 103
 104
 105 struct event *create_event( struct directory *root, const struct unicode_str *name,
 106                             unsigned int attr, int manual_reset, int initial_state,
 107                             const struct security_descriptor *sd )
 108 {
 109     struct event *event;
 110
 111     if ((event = create_named_object_dir( root, name, attr, &event_ops )))
 112     {
 113         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 114         {
 115             /* initialize it if it didn't already exist */
 116             event->manual_reset = manual_reset;
 117             event->signaled     = initial_state;
 118             if (sd) default_set_sd( &event->obj, sd, OWNER_SECURITY_INFORMATION|
 119                                                      GROUP_SECURITY_INFORMATION|
 120                                                      DACL_SECURITY_INFORMATION|
 121                                                      SACL_SECURITY_INFORMATION );
 122         }
 123     }
 124     return event;
 125 }
 126
 127 struct event *get_event_obj( struct process *process, obj_handle_t handle, unsigned int access )
 128 {
 129     return (struct event *)get_handle_obj( process, handle, access, &event_ops );
 130 }
 131
 132 void pulse_event( struct event *event )
 133 {
 134     event->signaled = 1;
 135     /* wake up all waiters if manual reset, a single one otherwise */
 136     wake_up( &event->obj, !event->manual_reset );
 137     event->signaled = 0;
 138 }
 139
 140 void set_event( struct event *event )
 141 {
 142     event->signaled = 1;
 143     /* wake up all waiters if manual reset, a single one otherwise */
 144     wake_up( &event->obj, !event->manual_reset );
 145 }
 146
 147 void reset_event( struct event *event )
 148 {
 149     event->signaled = 0;
 150 }
 151
 152 static void event_dump( struct object *obj, int verbose )
 153 {
 154     struct event *event = (struct event *)obj;
 155     assert( obj->ops == &event_ops );
 156     fprintf( stderr, "Event manual=%d signaled=%d ",
 157              event->manual_reset, event->signaled );
 158     dump_object_name( &event->obj );
 159     fputc( '\n', stderr );
 160 }
 161
 162 static struct object_type *event_get_type( struct object *obj )
 163 {
 164     static const WCHAR name[] = {'E','v','e','n','t'};
 165     static const struct unicode_str str = { name, sizeof(name) };
 166     return get_object_type( &str );
 167 }
 168
 169 static int event_signaled( struct object *obj, struct wait_queue_entry *entry )
 170 {
 171     struct event *event = (struct event *)obj;
 172     assert( obj->ops == &event_ops );
 173     return event->signaled;
 174 }
 175
 176 static void event_satisfied( struct object *obj, struct wait_queue_entry *entry )
 177 {
 178     struct event *event = (struct event *)obj;
 179     assert( obj->ops == &event_ops );
 180     /* Reset if it's an auto-reset event */
 181     if (!event->manual_reset) event->signaled = 0;
 182 }
 183
 184 static unsigned int event_map_access( struct object *obj, unsigned int access )
 185 {
 186     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | SYNCHRONIZE | EVENT_QUERY_STATE;
 187     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE;
 188     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
 189     if (access & GENERIC_ALL)     access |= STANDARD_RIGHTS_ALL | EVENT_ALL_ACCESS;
 190     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 191 }
 192
 193 static int event_signal( struct object *obj, unsigned int access )
 194 {
 195     struct event *event = (struct event *)obj;
 196     assert( obj->ops == &event_ops );
 197
 198     if (!(access & EVENT_MODIFY_STATE))
 199     {
 200         set_error( STATUS_ACCESS_DENIED );
 201         return 0;
 202     }
 203     set_event( event );
 204     return 1;
 205 }
 206
 207 struct keyed_event *create_keyed_event( struct directory *root, const struct unicode_str *name,
 208                                         unsigned int attr, const struct security_descriptor *sd )
 209 {
 210     struct keyed_event *event;
 211
 212     if ((event = create_named_object_dir( root, name, attr, &keyed_event_ops )))
 213     {
 214         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 215         {
 216             /* initialize it if it didn't already exist */
 217             if (sd) default_set_sd( &event->obj, sd, OWNER_SECURITY_INFORMATION|
 218                                                      GROUP_SECURITY_INFORMATION|
 219                                                      DACL_SECURITY_INFORMATION|
 220                                                      SACL_SECURITY_INFORMATION );
 221         }
 222     }
 223     return event;
 224 }
 225
 226 struct keyed_event *get_keyed_event_obj( struct process *process, obj_handle_t handle, unsigned int access )
 227 {
 228     return (struct keyed_event *)get_handle_obj( process, handle, access, &keyed_event_ops );
 229 }
 230
 231 static void keyed_event_dump( struct object *obj, int verbose )
 232 {
 233     struct keyed_event *event = (struct keyed_event *)obj;
 234     assert( obj->ops == &keyed_event_ops );
 235     fprintf( stderr, "Keyed event " );
 236     dump_object_name( &event->obj );
 237     fputc( '\n', stderr );
 238 }
 239
 240 static struct object_type *keyed_event_get_type( struct object *obj )
 241 {
 242     static const WCHAR name[] = {'K','e','y','e','d','E','v','e','n','t'};
 243     static const struct unicode_str str = { name, sizeof(name) };
 244     return get_object_type( &str );
 245 }
 246
 247 static enum select_op matching_op( enum select_op op )
 248 {
 249     return op ^ (SELECT_KEYED_EVENT_WAIT ^ SELECT_KEYED_EVENT_RELEASE);
 250 }
 251
 252 static int keyed_event_signaled( struct object *obj, struct wait_queue_entry *entry )
 253 {
 254     struct wait_queue_entry *ptr;
 255     struct process *process;
 256     enum select_op select_op;
 257
 258     assert( obj->ops == &keyed_event_ops );
 259
 260     process = get_wait_queue_thread( entry )->process;
 261     select_op = get_wait_queue_select_op( entry );
 262     if (select_op != SELECT_KEYED_EVENT_WAIT && select_op != SELECT_KEYED_EVENT_RELEASE) return 1;
 263
 264     LIST_FOR_EACH_ENTRY( ptr, &obj->wait_queue, struct wait_queue_entry, entry )
 265     {
 266         if (ptr == entry) continue;
 267         if (get_wait_queue_thread( ptr )->process != process) continue;
 268         if (get_wait_queue_select_op( ptr ) != matching_op( select_op )) continue;
 269         if (get_wait_queue_key( ptr ) != get_wait_queue_key( entry )) continue;
 270         if (wake_thread_queue_entry( ptr )) return 1;
 271     }
 272     return 0;
 273 }
 274
 275 static unsigned int keyed_event_map_access( struct object *obj, unsigned int access )
 276 {
 277     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | KEYEDEVENT_WAIT;
 278     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE | KEYEDEVENT_WAKE;
 279     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
 280     if (access & GENERIC_ALL)     access |= KEYEDEVENT_ALL_ACCESS;
 281     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 282 }
 283
 284 /* create an event */
 285 DECL_HANDLER(create_event)
 286 {
 287     struct event *event;
 288     struct unicode_str name;
 289     struct directory *root = NULL;
 290     const struct object_attributes *objattr = get_req_data();
 291     const struct security_descriptor *sd;
 292
 293     reply->handle = 0;
 294
 295     if (!objattr_is_valid( objattr, get_req_data_size() ))
 296         return;
 297
 298     sd = objattr->sd_len ? (const struct security_descriptor *)(objattr + 1) : NULL;
 299     objattr_get_name( objattr, &name );
 300
 301     if (objattr->rootdir && !(root = get_directory_obj( current->process, objattr->rootdir, 0 )))
 302         return;
 303
 304     if ((event = create_event( root, &name, req->attributes, req->manual_reset, req->initial_state, sd )))
 305     {
 306         if (get_error() == STATUS_OBJECT_NAME_EXISTS)
 307             reply->handle = alloc_handle( current->process, event, req->access, req->attributes );
 308         else
 309             reply->handle = alloc_handle_no_access_check( current->process, event, req->access, req->attributes );
 310         release_object( event );
 311     }
 312
 313     if (root) release_object( root );
 314 }
 315
 316 /* open a handle to an event */
 317 DECL_HANDLER(open_event)
 318 {
 319     struct unicode_str name;
 320     struct directory *root = NULL;
 321     struct event *event;
 322
 323     get_req_unicode_str( &name );
 324     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 325         return;
 326
 327     if ((event = open_object_dir( root, &name, req->attributes, &event_ops )))
 328     {
 329         reply->handle = alloc_handle( current->process, &event->obj, req->access, req->attributes );
 330         release_object( event );
 331     }
 332
 333     if (root) release_object( root );
 334 }
 335
 336 /* do an event operation */
 337 DECL_HANDLER(event_op)
 338 {
 339     struct event *event;
 340
 341     if (!(event = get_event_obj( current->process, req->handle, EVENT_MODIFY_STATE ))) return;
 342     switch(req->op)
 343     {
 344     case PULSE_EVENT:
 345         pulse_event( event );
 346         break;
 347     case SET_EVENT:
 348         set_event( event );
 349         break;
 350     case RESET_EVENT:
 351         reset_event( event );
 352         break;
 353     default:
 354         set_error( STATUS_INVALID_PARAMETER );
 355         break;
 356     }
 357     release_object( event );
 358 }
 359
 360 /* return details about the event */
 361 DECL_HANDLER(query_event)
 362 {
 363     struct event *event;
 364
 365     if (!(event = get_event_obj( current->process, req->handle, EVENT_QUERY_STATE ))) return;
 366
 367     reply->manual_reset = event->manual_reset;
 368     reply->state = event->signaled;
 369
 370     release_object( event );
 371 }
 372
 373 /* create a keyed event */
 374 DECL_HANDLER(create_keyed_event)
 375 {
 376     struct keyed_event *event;
 377     struct unicode_str name;
 378     struct directory *root = NULL;
 379     const struct object_attributes *objattr = get_req_data();
 380     const struct security_descriptor *sd;
 381
 382     if (!objattr_is_valid( objattr, get_req_data_size() )) return;
 383
 384     sd = objattr->sd_len ? (const struct security_descriptor *)(objattr + 1) : NULL;
 385     objattr_get_name( objattr, &name );
 386
 387     if (objattr->rootdir && !(root = get_directory_obj( current->process, objattr->rootdir, 0 ))) return;
 388
 389     if ((event = create_keyed_event( root, &name, req->attributes, sd )))
 390     {
 391         if (get_error() == STATUS_OBJECT_NAME_EXISTS)
 392             reply->handle = alloc_handle( current->process, event, req->access, req->attributes );
 393         else
 394             reply->handle = alloc_handle_no_access_check( current->process, event, req->access, req->attributes );
 395         release_object( event );
 396     }
 397     if (root) release_object( root );
 398 }
 399
 400 /* open a handle to a keyed event */
 401 DECL_HANDLER(open_keyed_event)
 402 {
 403     struct unicode_str name;
 404     struct directory *root = NULL;
 405     struct keyed_event *event;
 406
 407     get_req_unicode_str( &name );
 408     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 ))) return;
 409
 410     if ((event = open_object_dir( root, &name, req->attributes, &keyed_event_ops )))
 411     {
 412         reply->handle = alloc_handle( current->process, &event->obj, req->access, req->attributes );
 413         release_object( event );
 414     }
 415     if (root) release_object( root );
 416 }