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Sweden-Number/server/change.c

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/*
* Server-side change notification management
*
* Copyright (C) 1998 Alexandre Julliard
* Copyright (C) 2006 Mike McCormack
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/stat.h>
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "file.h"
#include "handle.h"
#include "thread.h"
#include "request.h"
#include "winternl.h"
#ifdef linux
#ifndef F_NOTIFY
#define F_NOTIFY 1026
#define DN_ACCESS 0x00000001 /* File accessed */
#define DN_MODIFY 0x00000002 /* File modified */
#define DN_CREATE 0x00000004 /* File created */
#define DN_DELETE 0x00000008 /* File removed */
#define DN_RENAME 0x00000010 /* File renamed */
#define DN_ATTRIB 0x00000020 /* File changed attibutes */
#define DN_MULTISHOT 0x80000000 /* Don't remove notifier */
#endif
#endif
struct dir
{
struct object obj; /* object header */
struct fd *fd; /* file descriptor to the directory */
struct list entry; /* entry in global change notifications list */
struct event *event;
unsigned int filter; /* notification filter */
int notified; /* SIGIO counter */
long signaled; /* the file changed */
};
static struct fd *dir_get_fd( struct object *obj );
static unsigned int dir_map_access( struct object *obj, unsigned int access );
static void dir_dump( struct object *obj, int verbose );
static void dir_destroy( struct object *obj );
static int dir_signaled( struct object *obj, struct thread *thread );
static const struct object_ops dir_ops =
{
sizeof(struct dir), /* size */
dir_dump, /* dump */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
dir_signaled, /* signaled */
no_satisfied, /* satisfied */
no_signal, /* signal */
dir_get_fd, /* get_fd */
dir_map_access, /* map_access */
no_lookup_name, /* lookup_name */
no_close_handle, /* close_handle */
dir_destroy /* destroy */
};
static int dir_get_poll_events( struct fd *fd );
static int dir_get_info( struct fd *fd );
static const struct fd_ops dir_fd_ops =
{
dir_get_poll_events, /* get_poll_events */
default_poll_event, /* poll_event */
no_flush, /* flush */
dir_get_info, /* get_file_info */
default_fd_queue_async, /* queue_async */
default_fd_cancel_async /* cancel_async */
};
static struct list change_list = LIST_INIT(change_list);
static void adjust_changes( int fd, unsigned int filter )
{
#if defined(F_SETSIG) && defined(F_NOTIFY)
unsigned int val;
if ( 0 > fcntl( fd, F_SETSIG, SIGIO) )
return;
val = DN_MULTISHOT;
if (filter & FILE_NOTIFY_CHANGE_FILE_NAME)
val |= DN_RENAME | DN_DELETE | DN_CREATE;
if (filter & FILE_NOTIFY_CHANGE_DIR_NAME)
val |= DN_RENAME | DN_DELETE | DN_CREATE;
if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
val |= DN_ATTRIB;
if (filter & FILE_NOTIFY_CHANGE_SIZE)
val |= DN_MODIFY;
if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
val |= DN_MODIFY;
if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
val |= DN_ACCESS;
if (filter & FILE_NOTIFY_CHANGE_CREATION)
val |= DN_CREATE;
if (filter & FILE_NOTIFY_CHANGE_SECURITY)
val |= DN_ATTRIB;
fcntl( fd, F_NOTIFY, val );
#endif
}
/* insert change in the global list */
static inline void insert_change( struct dir *dir )
{
sigset_t sigset;
sigemptyset( &sigset );
sigaddset( &sigset, SIGIO );
sigprocmask( SIG_BLOCK, &sigset, NULL );
list_add_head( &change_list, &dir->entry );
sigprocmask( SIG_UNBLOCK, &sigset, NULL );
}
/* remove change from the global list */
static inline void remove_change( struct dir *dir )
{
sigset_t sigset;
sigemptyset( &sigset );
sigaddset( &sigset, SIGIO );
sigprocmask( SIG_BLOCK, &sigset, NULL );
list_remove( &dir->entry );
sigprocmask( SIG_UNBLOCK, &sigset, NULL );
}
struct object *create_dir_obj( struct fd *fd )
{
struct dir *dir;
dir = alloc_object( &dir_ops );
if (!dir)
return NULL;
dir->event = NULL;
dir->filter = 0;
dir->notified = 0;
dir->signaled = 0;
grab_object( fd );
dir->fd = fd;
set_fd_user( fd, &dir_fd_ops, &dir->obj );
return &dir->obj;
}
static void dir_dump( struct object *obj, int verbose )
{
struct dir *dir = (struct dir *)obj;
assert( obj->ops == &dir_ops );
fprintf( stderr, "Dirfile fd=%p event=%p filter=%08x\n",
dir->fd, dir->event, dir->filter );
}
static int dir_signaled( struct object *obj, struct thread *thread )
{
struct dir *dir = (struct dir *)obj;
assert (obj->ops == &dir_ops);
return (dir->event == NULL) && dir->signaled;
}
/* enter here directly from SIGIO signal handler */
void do_change_notify( int unix_fd )
{
struct list *ptr;
/* FIXME: this is O(n) ... probably can be improved */
LIST_FOR_EACH( ptr, &change_list )
{
struct dir *dir = LIST_ENTRY( ptr, struct dir, entry );
if (get_unix_fd( dir->fd ) != unix_fd) continue;
interlocked_xchg_add( &dir->notified, 1 );
break;
}
}
/* SIGIO callback, called synchronously with the poll loop */
void sigio_callback(void)
{
struct list *ptr;
LIST_FOR_EACH( ptr, &change_list )
{
struct dir *dir = LIST_ENTRY( ptr, struct dir, entry );
long count = interlocked_xchg( &dir->notified, 0 );
if (count)
{
dir->signaled += count;
if (dir->signaled == count) /* was it 0? */
{
if (dir->event)
set_event( dir->event );
else
wake_up( &dir->obj, 0 );
}
}
}
}
static struct fd *dir_get_fd( struct object *obj )
{
struct dir *dir = (struct dir *)obj;
assert( obj->ops == &dir_ops );
return (struct fd *)grab_object( dir->fd );
}
static unsigned int dir_map_access( struct object *obj, unsigned int access )
{
if (access & GENERIC_READ) access |= FILE_GENERIC_READ;
if (access & GENERIC_WRITE) access |= FILE_GENERIC_WRITE;
if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
if (access & GENERIC_ALL) access |= FILE_ALL_ACCESS;
return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
}
static void dir_destroy( struct object *obj )
{
struct dir *dir = (struct dir *)obj;
assert (obj->ops == &dir_ops);
if (dir->filter)
remove_change( dir );
if (dir->event)
{
set_event( dir->event );
release_object( dir->event );
}
release_object( dir->fd );
}
static struct dir *
get_dir_obj( struct process *process, obj_handle_t handle, unsigned int access )
{
return (struct dir *)get_handle_obj( process, handle, access, &dir_ops );
}
static int dir_get_poll_events( struct fd *fd )
{
return 0;
}
static int dir_get_info( struct fd *fd )
{
return 0;
}
/* enable change notifications for a directory */
DECL_HANDLER(read_directory_changes)
{
struct event *event = NULL;
struct dir *dir;
if (!req->filter)
{
set_error(STATUS_INVALID_PARAMETER);
return;
}
dir = get_dir_obj( current->process, req->handle, 0 );
if (!dir)
return;
/* possibly send changes through an event flag */
if (req->event)
{
event = get_event_obj( current->process, req->event, EVENT_MODIFY_STATE );
if (!event)
goto end;
}
/* discard the current data, and move onto the next event */
if (dir->event) release_object( dir->event );
dir->event = event;
/* assign it once */
if (!dir->filter)
{
insert_change( dir );
dir->filter = req->filter;
}
/* remove any notifications */
if (dir->signaled>0)
dir->signaled--;
adjust_changes( get_unix_fd( dir->fd ), dir->filter );
set_error(STATUS_PENDING);
end:
release_object( dir );
}
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