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
  38 struct event
  39 {
  40     struct object  obj;             /* object header */
  41     int            manual_reset;    /* is it a manual reset event? */
  42     int            signaled;        /* event has been signaled */
  43 };
  44
  45 static void event_dump( struct object *obj, int verbose );
  46 static int event_signaled( struct object *obj, struct thread *thread );
  47 static int event_satisfied( struct object *obj, struct thread *thread );
  48 static unsigned int event_map_access( struct object *obj, unsigned int access );
  49 static int event_signal( struct object *obj, unsigned int access);
  50
  51 static const struct object_ops event_ops =
  52 {
  53     sizeof(struct event),      /* size */
  54     event_dump,                /* dump */
  55     add_queue,                 /* add_queue */
  56     remove_queue,              /* remove_queue */
  57     event_signaled,            /* signaled */
  58     event_satisfied,           /* satisfied */
  59     event_signal,              /* signal */
  60     no_get_fd,                 /* get_fd */
  61     event_map_access,          /* map_access */
  62     no_lookup_name,            /* lookup_name */
  63     no_close_handle,           /* close_handle */
  64     no_destroy                 /* destroy */
  65 };
  66
  67
  68 struct event *create_event( struct directory *root, const struct unicode_str *name,
  69                             unsigned int attr, int manual_reset, int initial_state )
  70 {
  71     struct event *event;
  72
  73     if ((event = create_named_object_dir( root, name, attr, &event_ops )))
  74     {
  75         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
  76         {
  77             /* initialize it if it didn't already exist */
  78             event->manual_reset = manual_reset;
  79             event->signaled     = initial_state;
  80         }
  81     }
  82     return event;
  83 }
  84
  85 struct event *get_event_obj( struct process *process, obj_handle_t handle, unsigned int access )
  86 {
  87     return (struct event *)get_handle_obj( process, handle, access, &event_ops );
  88 }
  89
  90 void pulse_event( struct event *event )
  91 {
  92     event->signaled = 1;
  93     /* wake up all waiters if manual reset, a single one otherwise */
  94     wake_up( &event->obj, !event->manual_reset );
  95     event->signaled = 0;
  96 }
  97
  98 void set_event( struct event *event )
  99 {
 100     event->signaled = 1;
 101     /* wake up all waiters if manual reset, a single one otherwise */
 102     wake_up( &event->obj, !event->manual_reset );
 103 }
 104
 105 void reset_event( struct event *event )
 106 {
 107     event->signaled = 0;
 108 }
 109
 110 static void event_dump( struct object *obj, int verbose )
 111 {
 112     struct event *event = (struct event *)obj;
 113     assert( obj->ops == &event_ops );
 114     fprintf( stderr, "Event manual=%d signaled=%d ",
 115              event->manual_reset, event->signaled );
 116     dump_object_name( &event->obj );
 117     fputc( '\n', stderr );
 118 }
 119
 120 static int event_signaled( struct object *obj, struct thread *thread )
 121 {
 122     struct event *event = (struct event *)obj;
 123     assert( obj->ops == &event_ops );
 124     return event->signaled;
 125 }
 126
 127 static int event_satisfied( struct object *obj, struct thread *thread )
 128 {
 129     struct event *event = (struct event *)obj;
 130     assert( obj->ops == &event_ops );
 131     /* Reset if it's an auto-reset event */
 132     if (!event->manual_reset) event->signaled = 0;
 133     return 0;  /* Not abandoned */
 134 }
 135
 136 static unsigned int event_map_access( struct object *obj, unsigned int access )
 137 {
 138     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | SYNCHRONIZE | EVENT_QUERY_STATE;
 139     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE;
 140     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
 141     if (access & GENERIC_ALL)     access |= STANDARD_RIGHTS_ALL | EVENT_ALL_ACCESS;
 142     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 143 }
 144
 145 static int event_signal( struct object *obj, unsigned int access )
 146 {
 147     struct event *event = (struct event *)obj;
 148     assert( obj->ops == &event_ops );
 149
 150     if (!(access & EVENT_MODIFY_STATE))
 151     {
 152         set_error( STATUS_ACCESS_DENIED );
 153         return 0;
 154     }
 155     set_event( event );
 156     return 1;
 157 }
 158
 159 /* create an event */
 160 DECL_HANDLER(create_event)
 161 {
 162     struct event *event;
 163     struct unicode_str name;
 164     struct directory *root = NULL;
 165
 166     reply->handle = 0;
 167     get_req_unicode_str( &name );
 168     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 169         return;
 170
 171     if ((event = create_event( root, &name, req->attributes, req->manual_reset, req->initial_state )))
 172     {
 173         reply->handle = alloc_handle( current->process, event, req->access, req->attributes );
 174         release_object( event );
 175     }
 176
 177     if (root) release_object( root );
 178 }
 179
 180 /* open a handle to an event */
 181 DECL_HANDLER(open_event)
 182 {
 183     struct unicode_str name;
 184     struct directory *root = NULL;
 185     struct event *event;
 186
 187     get_req_unicode_str( &name );
 188     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 189         return;
 190
 191     if ((event = open_object_dir( root, &name, req->attributes, &event_ops )))
 192     {
 193         reply->handle = alloc_handle( current->process, &event->obj, req->access, req->attributes );
 194         release_object( event );
 195     }
 196
 197     if (root) release_object( root );
 198 }
 199
 200 /* do an event operation */
 201 DECL_HANDLER(event_op)
 202 {
 203     struct event *event;
 204
 205     if (!(event = get_event_obj( current->process, req->handle, EVENT_MODIFY_STATE ))) return;
 206     switch(req->op)
 207     {
 208     case PULSE_EVENT:
 209         pulse_event( event );
 210         break;
 211     case SET_EVENT:
 212         set_event( event );
 213         break;
 214     case RESET_EVENT:
 215         reset_event( event );
 216         break;
 217     default:
 218         set_error( STATUS_INVALID_PARAMETER );
 219         break;
 220     }
 221     release_object( event );
 222 }