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