381 lines
12 KiB
C
381 lines
12 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 <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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static const WCHAR event_name[] = {'E','v','e','n','t'};
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struct type_descr event_type =
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{
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{ event_name, sizeof(event_name) }, /* name */
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EVENT_ALL_ACCESS, /* valid_access */
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{ /* mapping */
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STANDARD_RIGHTS_READ | EVENT_QUERY_STATE,
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STANDARD_RIGHTS_WRITE | EVENT_MODIFY_STATE,
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STANDARD_RIGHTS_EXECUTE | SYNCHRONIZE,
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EVENT_ALL_ACCESS
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},
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};
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struct event
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{
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struct object obj; /* object header */
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struct list kernel_object; /* list of kernel object pointers */
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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 int event_signaled( struct object *obj, struct wait_queue_entry *entry );
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static void event_satisfied( struct object *obj, struct wait_queue_entry *entry );
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static int event_signal( struct object *obj, unsigned int access);
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static struct list *event_get_kernel_obj_list( struct object *obj );
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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_type, /* type */
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event_dump, /* dump */
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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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default_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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default_get_full_name, /* get_full_name */
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no_lookup_name, /* lookup_name */
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directory_link_name, /* link_name */
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default_unlink_name, /* unlink_name */
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no_open_file, /* open_file */
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event_get_kernel_obj_list, /* get_kernel_obj_list */
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no_close_handle, /* close_handle */
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no_destroy /* destroy */
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};
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static const WCHAR keyed_event_name[] = {'K','e','y','e','d','E','v','e','n','t'};
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struct type_descr keyed_event_type =
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{
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{ keyed_event_name, sizeof(keyed_event_name) }, /* name */
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KEYEDEVENT_ALL_ACCESS | SYNCHRONIZE, /* valid_access */
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{ /* mapping */
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STANDARD_RIGHTS_READ | KEYEDEVENT_WAIT,
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STANDARD_RIGHTS_WRITE | KEYEDEVENT_WAKE,
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STANDARD_RIGHTS_EXECUTE,
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KEYEDEVENT_ALL_ACCESS
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},
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};
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struct keyed_event
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{
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struct object obj; /* object header */
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};
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static void keyed_event_dump( struct object *obj, int verbose );
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static int keyed_event_signaled( struct object *obj, struct wait_queue_entry *entry );
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static const struct object_ops keyed_event_ops =
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{
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sizeof(struct keyed_event), /* size */
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&keyed_event_type, /* type */
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keyed_event_dump, /* dump */
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add_queue, /* add_queue */
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remove_queue, /* remove_queue */
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keyed_event_signaled, /* signaled */
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no_satisfied, /* satisfied */
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no_signal, /* signal */
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no_get_fd, /* get_fd */
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default_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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default_get_full_name, /* get_full_name */
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no_lookup_name, /* lookup_name */
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directory_link_name, /* link_name */
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default_unlink_name, /* unlink_name */
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no_open_file, /* open_file */
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no_kernel_obj_list, /* get_kernel_obj_list */
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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 object *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( root, &event_ops, name, attr, sd )))
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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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list_init( &event->kernel_object );
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event->manual_reset = manual_reset;
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event->signaled = initial_state;
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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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static 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\n",
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event->manual_reset, event->signaled );
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}
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static int event_signaled( struct object *obj, struct wait_queue_entry *entry )
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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 void event_satisfied( struct object *obj, struct wait_queue_entry *entry )
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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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}
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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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static struct list *event_get_kernel_obj_list( struct object *obj )
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{
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struct event *event = (struct event *)obj;
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return &event->kernel_object;
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}
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struct keyed_event *create_keyed_event( struct object *root, const struct unicode_str *name,
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unsigned int attr, const struct security_descriptor *sd )
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{
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struct keyed_event *event;
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if ((event = create_named_object( root, &keyed_event_ops, name, attr, sd )))
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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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}
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}
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return event;
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}
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struct keyed_event *get_keyed_event_obj( struct process *process, obj_handle_t handle, unsigned int access )
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{
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return (struct keyed_event *)get_handle_obj( process, handle, access, &keyed_event_ops );
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}
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static void keyed_event_dump( struct object *obj, int verbose )
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{
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fputs( "Keyed event\n", stderr );
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}
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static enum select_op matching_op( enum select_op op )
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{
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return op ^ (SELECT_KEYED_EVENT_WAIT ^ SELECT_KEYED_EVENT_RELEASE);
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}
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static int keyed_event_signaled( struct object *obj, struct wait_queue_entry *entry )
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{
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struct wait_queue_entry *ptr;
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struct process *process;
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enum select_op select_op;
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assert( obj->ops == &keyed_event_ops );
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process = get_wait_queue_thread( entry )->process;
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select_op = get_wait_queue_select_op( entry );
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if (select_op != SELECT_KEYED_EVENT_WAIT && select_op != SELECT_KEYED_EVENT_RELEASE) return 1;
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LIST_FOR_EACH_ENTRY( ptr, &obj->wait_queue, struct wait_queue_entry, entry )
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{
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if (ptr == entry) continue;
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if (get_wait_queue_thread( ptr )->process != process) continue;
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if (get_wait_queue_select_op( ptr ) != matching_op( select_op )) continue;
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if (get_wait_queue_key( ptr ) != get_wait_queue_key( entry )) continue;
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if (wake_thread_queue_entry( ptr )) return 1;
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}
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return 0;
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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 object *root;
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const struct security_descriptor *sd;
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const struct object_attributes *objattr = get_req_object_attributes( &sd, &name, &root );
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if (!objattr) return;
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if ((event = create_event( root, &name, objattr->attributes,
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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, objattr->attributes );
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else
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reply->handle = alloc_handle_no_access_check( current->process, event,
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req->access, objattr->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 = get_req_unicode_str();
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reply->handle = open_object( current->process, req->rootdir, req->access,
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&event_ops, &name, req->attributes );
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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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reply->state = event->signaled;
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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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/* return details about the event */
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DECL_HANDLER(query_event)
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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_QUERY_STATE ))) return;
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reply->manual_reset = event->manual_reset;
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reply->state = event->signaled;
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release_object( event );
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}
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/* create a keyed event */
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DECL_HANDLER(create_keyed_event)
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{
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struct keyed_event *event;
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struct unicode_str name;
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struct object *root;
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const struct security_descriptor *sd;
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const struct object_attributes *objattr = get_req_object_attributes( &sd, &name, &root );
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if (!objattr) return;
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if ((event = create_keyed_event( root, &name, objattr->attributes, 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, objattr->attributes );
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else
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reply->handle = alloc_handle_no_access_check( current->process, event,
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req->access, objattr->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 a keyed event */
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DECL_HANDLER(open_keyed_event)
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{
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struct unicode_str name = get_req_unicode_str();
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reply->handle = open_object( current->process, req->rootdir, req->access,
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&keyed_event_ops, &name, req->attributes );
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}
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