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_open_file,              /* open_file */
  64     no_close_handle,           /* close_handle */
  65     no_destroy                 /* destroy */
  66 };
  67
  68
  69 struct event *create_event( struct directory *root, const struct unicode_str *name,
  70                             unsigned int attr, int manual_reset, int initial_state )
  71 {
  72     struct event *event;
  73
  74     if ((event = create_named_object_dir( root, name, attr, &event_ops )))
  75     {
  76         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
  77         {
  78             /* initialize it if it didn't already exist */
  79             event->manual_reset = manual_reset;
  80             event->signaled     = initial_state;
  81         }
  82     }
  83     return event;
  84 }
  85
  86 struct event *get_event_obj( struct process *process, obj_handle_t handle, unsigned int access )
  87 {
  88     return (struct event *)get_handle_obj( process, handle, access, &event_ops );
  89 }
  90
  91 void pulse_event( struct event *event )
  92 {
  93     event->signaled = 1;
  94     /* wake up all waiters if manual reset, a single one otherwise */
  95     wake_up( &event->obj, !event->manual_reset );
  96     event->signaled = 0;
  97 }
  98
  99 void set_event( struct event *event )
 100 {
 101     event->signaled = 1;
 102     /* wake up all waiters if manual reset, a single one otherwise */
 103     wake_up( &event->obj, !event->manual_reset );
 104 }
 105
 106 void reset_event( struct event *event )
 107 {
 108     event->signaled = 0;
 109 }
 110
 111 static void event_dump( struct object *obj, int verbose )
 112 {
 113     struct event *event = (struct event *)obj;
 114     assert( obj->ops == &event_ops );
 115     fprintf( stderr, "Event manual=%d signaled=%d ",
 116              event->manual_reset, event->signaled );
 117     dump_object_name( &event->obj );
 118     fputc( '\n', stderr );
 119 }
 120
 121 static int event_signaled( struct object *obj, struct thread *thread )
 122 {
 123     struct event *event = (struct event *)obj;
 124     assert( obj->ops == &event_ops );
 125     return event->signaled;
 126 }
 127
 128 static int event_satisfied( struct object *obj, struct thread *thread )
 129 {
 130     struct event *event = (struct event *)obj;
 131     assert( obj->ops == &event_ops );
 132     /* Reset if it's an auto-reset event */
 133     if (!event->manual_reset) event->signaled = 0;
 134     return 0;  /* Not abandoned */
 135 }
 136
 137 static unsigned int event_map_access( struct object *obj, unsigned int access )
 138 {
 139     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | SYNCHRONIZE | EVENT_QUERY_STATE;
 140     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE;
 141     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
 142     if (access & GENERIC_ALL)     access |= STANDARD_RIGHTS_ALL | EVENT_ALL_ACCESS;
 143     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 144 }
 145
 146 static int event_signal( struct object *obj, unsigned int access )
 147 {
 148     struct event *event = (struct event *)obj;
 149     assert( obj->ops == &event_ops );
 150
 151     if (!(access & EVENT_MODIFY_STATE))
 152     {
 153         set_error( STATUS_ACCESS_DENIED );
 154         return 0;
 155     }
 156     set_event( event );
 157     return 1;
 158 }
 159
 160 /* create an event */
 161 DECL_HANDLER(create_event)
 162 {
 163     struct event *event;
 164     struct unicode_str name;
 165     struct directory *root = NULL;
 166
 167     reply->handle = 0;
 168     get_req_unicode_str( &name );
 169     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 170         return;
 171
 172     if ((event = create_event( root, &name, req->attributes, req->manual_reset, req->initial_state )))
 173     {
 174         reply->handle = alloc_handle( current->process, event, req->access, req->attributes );
 175         release_object( event );
 176     }
 177
 178     if (root) release_object( root );
 179 }
 180
 181 /* open a handle to an event */
 182 DECL_HANDLER(open_event)
 183 {
 184     struct unicode_str name;
 185     struct directory *root = NULL;
 186     struct event *event;
 187
 188     get_req_unicode_str( &name );
 189     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 190         return;
 191
 192     if ((event = open_object_dir( root, &name, req->attributes, &event_ops )))
 193     {
 194         reply->handle = alloc_handle( current->process, &event->obj, req->access, req->attributes );
 195         release_object( event );
 196     }
 197
 198     if (root) release_object( root );
 199 }
 200
 201 /* do an event operation */
 202 DECL_HANDLER(event_op)
 203 {
 204     struct event *event;
 205
 206     if (!(event = get_event_obj( current->process, req->handle, EVENT_MODIFY_STATE ))) return;
 207     switch(req->op)
 208     {
 209     case PULSE_EVENT:
 210         pulse_event( event );
 211         break;
 212     case SET_EVENT:
 213         set_event( event );
 214         break;
 215     case RESET_EVENT:
 216         reset_event( event );
 217         break;
 218     default:
 219         set_error( STATUS_INVALID_PARAMETER );
 220         break;
 221     }
 222     release_object( event );
 223 }