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Sweden-Number/server/event.c

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/*
* Server-side event management
*
* Copyright (C) 1998 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winternl.h"
#include "handle.h"
#include "thread.h"
#include "request.h"
#include "security.h"
struct event
{
struct object obj; /* object header */
int manual_reset; /* is it a manual reset event? */
int signaled; /* event has been signaled */
};
static void event_dump( struct object *obj, int verbose );
static struct object_type *event_get_type( struct object *obj );
static int event_signaled( struct object *obj, struct wait_queue_entry *entry );
static void event_satisfied( struct object *obj, struct wait_queue_entry *entry );
static unsigned int event_map_access( struct object *obj, unsigned int access );
static int event_signal( struct object *obj, unsigned int access);
static const struct object_ops event_ops =
{
sizeof(struct event), /* size */
event_dump, /* dump */
event_get_type, /* get_type */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
event_signaled, /* signaled */
event_satisfied, /* satisfied */
event_signal, /* signal */
no_get_fd, /* get_fd */
event_map_access, /* map_access */
default_get_sd, /* get_sd */
default_set_sd, /* set_sd */
no_lookup_name, /* lookup_name */
no_open_file, /* open_file */
no_close_handle, /* close_handle */
no_destroy /* destroy */
};
struct keyed_event
{
struct object obj; /* object header */
};
static void keyed_event_dump( struct object *obj, int verbose );
static struct object_type *keyed_event_get_type( struct object *obj );
static int keyed_event_signaled( struct object *obj, struct wait_queue_entry *entry );
static unsigned int keyed_event_map_access( struct object *obj, unsigned int access );
static const struct object_ops keyed_event_ops =
{
sizeof(struct keyed_event), /* size */
keyed_event_dump, /* dump */
keyed_event_get_type, /* get_type */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
keyed_event_signaled, /* signaled */
no_satisfied, /* satisfied */
no_signal, /* signal */
no_get_fd, /* get_fd */
keyed_event_map_access, /* map_access */
default_get_sd, /* get_sd */
default_set_sd, /* set_sd */
no_lookup_name, /* lookup_name */
no_open_file, /* open_file */
no_close_handle, /* close_handle */
no_destroy /* destroy */
};
struct event *create_event( struct directory *root, const struct unicode_str *name,
unsigned int attr, int manual_reset, int initial_state,
const struct security_descriptor *sd )
{
struct event *event;
if ((event = create_named_object_dir( root, name, attr, &event_ops )))
{
if (get_error() != STATUS_OBJECT_NAME_EXISTS)
{
/* initialize it if it didn't already exist */
event->manual_reset = manual_reset;
event->signaled = initial_state;
if (sd) default_set_sd( &event->obj, sd, OWNER_SECURITY_INFORMATION|
GROUP_SECURITY_INFORMATION|
DACL_SECURITY_INFORMATION|
SACL_SECURITY_INFORMATION );
}
}
return event;
}
struct event *get_event_obj( struct process *process, obj_handle_t handle, unsigned int access )
{
return (struct event *)get_handle_obj( process, handle, access, &event_ops );
}
void pulse_event( struct event *event )
{
event->signaled = 1;
/* wake up all waiters if manual reset, a single one otherwise */
wake_up( &event->obj, !event->manual_reset );
event->signaled = 0;
}
void set_event( struct event *event )
{
event->signaled = 1;
/* wake up all waiters if manual reset, a single one otherwise */
wake_up( &event->obj, !event->manual_reset );
}
void reset_event( struct event *event )
{
event->signaled = 0;
}
static void event_dump( struct object *obj, int verbose )
{
struct event *event = (struct event *)obj;
assert( obj->ops == &event_ops );
fprintf( stderr, "Event manual=%d signaled=%d ",
event->manual_reset, event->signaled );
dump_object_name( &event->obj );
fputc( '\n', stderr );
}
static struct object_type *event_get_type( struct object *obj )
{
static const WCHAR name[] = {'E','v','e','n','t'};
static const struct unicode_str str = { name, sizeof(name) };
return get_object_type( &str );
}
static int event_signaled( struct object *obj, struct wait_queue_entry *entry )
{
struct event *event = (struct event *)obj;
assert( obj->ops == &event_ops );
return event->signaled;
}
static void event_satisfied( struct object *obj, struct wait_queue_entry *entry )
{
struct event *event = (struct event *)obj;
assert( obj->ops == &event_ops );
/* Reset if it's an auto-reset event */
if (!event->manual_reset) event->signaled = 0;
}
static unsigned int event_map_access( struct object *obj, unsigned int access )
{
if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ | EVENT_QUERY_STATE;
if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE | EVENT_MODIFY_STATE;
if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | SYNCHRONIZE;
if (access & GENERIC_ALL) access |= STANDARD_RIGHTS_ALL | EVENT_QUERY_STATE | EVENT_MODIFY_STATE;
return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
}
static int event_signal( struct object *obj, unsigned int access )
{
struct event *event = (struct event *)obj;
assert( obj->ops == &event_ops );
if (!(access & EVENT_MODIFY_STATE))
{
set_error( STATUS_ACCESS_DENIED );
return 0;
}
set_event( event );
return 1;
}
struct keyed_event *create_keyed_event( struct directory *root, const struct unicode_str *name,
unsigned int attr, const struct security_descriptor *sd )
{
struct keyed_event *event;
if ((event = create_named_object_dir( root, name, attr, &keyed_event_ops )))
{
if (get_error() != STATUS_OBJECT_NAME_EXISTS)
{
/* initialize it if it didn't already exist */
if (sd) default_set_sd( &event->obj, sd, OWNER_SECURITY_INFORMATION|
GROUP_SECURITY_INFORMATION|
DACL_SECURITY_INFORMATION|
SACL_SECURITY_INFORMATION );
}
}
return event;
}
struct keyed_event *get_keyed_event_obj( struct process *process, obj_handle_t handle, unsigned int access )
{
return (struct keyed_event *)get_handle_obj( process, handle, access, &keyed_event_ops );
}
static void keyed_event_dump( struct object *obj, int verbose )
{
struct keyed_event *event = (struct keyed_event *)obj;
assert( obj->ops == &keyed_event_ops );
fprintf( stderr, "Keyed event " );
dump_object_name( &event->obj );
fputc( '\n', stderr );
}
static struct object_type *keyed_event_get_type( struct object *obj )
{
static const WCHAR name[] = {'K','e','y','e','d','E','v','e','n','t'};
static const struct unicode_str str = { name, sizeof(name) };
return get_object_type( &str );
}
static enum select_op matching_op( enum select_op op )
{
return op ^ (SELECT_KEYED_EVENT_WAIT ^ SELECT_KEYED_EVENT_RELEASE);
}
static int keyed_event_signaled( struct object *obj, struct wait_queue_entry *entry )
{
struct wait_queue_entry *ptr;
struct process *process;
enum select_op select_op;
assert( obj->ops == &keyed_event_ops );
process = get_wait_queue_thread( entry )->process;
select_op = get_wait_queue_select_op( entry );
if (select_op != SELECT_KEYED_EVENT_WAIT && select_op != SELECT_KEYED_EVENT_RELEASE) return 1;
LIST_FOR_EACH_ENTRY( ptr, &obj->wait_queue, struct wait_queue_entry, entry )
{
if (ptr == entry) continue;
if (get_wait_queue_thread( ptr )->process != process) continue;
if (get_wait_queue_select_op( ptr ) != matching_op( select_op )) continue;
if (get_wait_queue_key( ptr ) != get_wait_queue_key( entry )) continue;
if (wake_thread_queue_entry( ptr )) return 1;
}
return 0;
}
static unsigned int keyed_event_map_access( struct object *obj, unsigned int access )
{
if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ | KEYEDEVENT_WAIT;
if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE | KEYEDEVENT_WAKE;
if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
if (access & GENERIC_ALL) access |= KEYEDEVENT_ALL_ACCESS;
return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
}
/* create an event */
DECL_HANDLER(create_event)
{
struct event *event;
struct unicode_str name;
struct directory *root = NULL;
const struct security_descriptor *sd;
const struct object_attributes *objattr = get_req_object_attributes( &sd, &name );
if (!objattr) return;
if (objattr->rootdir && !(root = get_directory_obj( current->process, objattr->rootdir, 0 )))
return;
if ((event = create_event( root, &name, objattr->attributes,
req->manual_reset, req->initial_state, sd )))
{
if (get_error() == STATUS_OBJECT_NAME_EXISTS)
reply->handle = alloc_handle( current->process, event, req->access, objattr->attributes );
else
reply->handle = alloc_handle_no_access_check( current->process, event,
req->access, objattr->attributes );
release_object( event );
}
if (root) release_object( root );
}
/* open a handle to an event */
DECL_HANDLER(open_event)
{
struct unicode_str name;
struct directory *root = NULL;
struct event *event;
get_req_unicode_str( &name );
if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
return;
if ((event = open_object_dir( root, &name, req->attributes, &event_ops )))
{
reply->handle = alloc_handle( current->process, &event->obj, req->access, req->attributes );
release_object( event );
}
if (root) release_object( root );
}
/* do an event operation */
DECL_HANDLER(event_op)
{
struct event *event;
if (!(event = get_event_obj( current->process, req->handle, EVENT_MODIFY_STATE ))) return;
switch(req->op)
{
case PULSE_EVENT:
pulse_event( event );
break;
case SET_EVENT:
set_event( event );
break;
case RESET_EVENT:
reset_event( event );
break;
default:
set_error( STATUS_INVALID_PARAMETER );
break;
}
release_object( event );
}
/* return details about the event */
DECL_HANDLER(query_event)
{
struct event *event;
if (!(event = get_event_obj( current->process, req->handle, EVENT_QUERY_STATE ))) return;
reply->manual_reset = event->manual_reset;
reply->state = event->signaled;
release_object( event );
}
/* create a keyed event */
DECL_HANDLER(create_keyed_event)
{
struct keyed_event *event;
struct unicode_str name;
struct directory *root = NULL;
const struct security_descriptor *sd;
const struct object_attributes *objattr = get_req_object_attributes( &sd, &name );
if (!objattr) return;
if (objattr->rootdir && !(root = get_directory_obj( current->process, objattr->rootdir, 0 ))) return;
if ((event = create_keyed_event( root, &name, objattr->attributes, sd )))
{
if (get_error() == STATUS_OBJECT_NAME_EXISTS)
reply->handle = alloc_handle( current->process, event, req->access, objattr->attributes );
else
reply->handle = alloc_handle_no_access_check( current->process, event,
req->access, objattr->attributes );
release_object( event );
}
if (root) release_object( root );
}
/* open a handle to a keyed event */
DECL_HANDLER(open_keyed_event)
{
struct unicode_str name;
struct directory *root = NULL;
struct keyed_event *event;
get_req_unicode_str( &name );
if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 ))) return;
if ((event = open_object_dir( root, &name, req->attributes, &keyed_event_ops )))
{
reply->handle = alloc_handle( current->process, &event->obj, req->access, req->attributes );
release_object( event );
}
if (root) release_object( root );
}
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