250 lines
7.3 KiB
C
250 lines
7.3 KiB
C
/*
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* Server-side change notification 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <sys/stat.h>
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#include "windef.h"
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#include "file.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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#ifdef linux
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#ifndef F_NOTIFY
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#define F_NOTIFY 1026
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#define DN_ACCESS 0x00000001 /* File accessed */
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#define DN_MODIFY 0x00000002 /* File modified */
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#define DN_CREATE 0x00000004 /* File created */
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#define DN_DELETE 0x00000008 /* File removed */
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#define DN_RENAME 0x00000010 /* File renamed */
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#define DN_ATTRIB 0x00000020 /* File changed attibutes */
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#define DN_MULTISHOT 0x80000000 /* Don't remove notifier */
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#endif
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#endif
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struct change
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{
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struct object obj; /* object header */
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struct fd *fd; /* file descriptor to the directory */
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struct list entry; /* entry in global change notifications list */
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int subtree; /* watch all the subtree */
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unsigned int filter; /* notification filter */
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int notified; /* SIGIO counter */
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long signaled; /* the file changed */
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};
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static void change_dump( struct object *obj, int verbose );
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static int change_signaled( struct object *obj, struct thread *thread );
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static void change_destroy( struct object *obj );
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static const struct object_ops change_ops =
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{
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sizeof(struct change), /* size */
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change_dump, /* dump */
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add_queue, /* add_queue */
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remove_queue, /* remove_queue */
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change_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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no_close_handle, /* close_handle */
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change_destroy /* destroy */
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};
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static struct list change_list = LIST_INIT(change_list);
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static void adjust_changes( int fd, unsigned int filter )
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{
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#if defined(F_SETSIG) && defined(F_NOTIFY)
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unsigned int val;
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if ( 0 > fcntl( fd, F_SETSIG, SIGIO) )
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return;
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val = DN_MULTISHOT;
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if (filter & FILE_NOTIFY_CHANGE_FILE_NAME)
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val |= DN_RENAME | DN_DELETE | DN_CREATE;
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if (filter & FILE_NOTIFY_CHANGE_DIR_NAME)
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val |= DN_RENAME | DN_DELETE | DN_CREATE;
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if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
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val |= DN_ATTRIB;
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if (filter & FILE_NOTIFY_CHANGE_SIZE)
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val |= DN_MODIFY;
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if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
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val |= DN_MODIFY;
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if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
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val |= DN_ACCESS;
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if (filter & FILE_NOTIFY_CHANGE_CREATION)
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val |= DN_CREATE;
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if (filter & FILE_NOTIFY_CHANGE_SECURITY)
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val |= DN_ATTRIB;
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fcntl( fd, F_NOTIFY, val );
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#endif
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}
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/* insert change in the global list */
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static inline void insert_change( struct change *change )
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{
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sigset_t sigset;
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sigemptyset( &sigset );
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sigaddset( &sigset, SIGIO );
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sigprocmask( SIG_BLOCK, &sigset, NULL );
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list_add_head( &change_list, &change->entry );
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sigprocmask( SIG_UNBLOCK, &sigset, NULL );
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}
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/* remove change from the global list */
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static inline void remove_change( struct change *change )
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{
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sigset_t sigset;
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sigemptyset( &sigset );
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sigaddset( &sigset, SIGIO );
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sigprocmask( SIG_BLOCK, &sigset, NULL );
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list_remove( &change->entry );
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sigprocmask( SIG_UNBLOCK, &sigset, NULL );
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}
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static struct change *create_change_notification( struct fd *fd, int subtree, unsigned int filter )
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{
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struct change *change;
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struct stat st;
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int unix_fd = get_unix_fd( fd );
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if (unix_fd == -1) return NULL;
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if (fstat( unix_fd, &st ) == -1 || !S_ISDIR(st.st_mode))
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{
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set_error( STATUS_NOT_A_DIRECTORY );
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return NULL;
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}
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if ((change = alloc_object( &change_ops )))
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{
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change->fd = (struct fd *)grab_object( fd );
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change->subtree = subtree;
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change->filter = filter;
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change->notified = 0;
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change->signaled = 0;
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insert_change( change );
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adjust_changes( unix_fd, filter );
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}
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return change;
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}
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static void change_dump( struct object *obj, int verbose )
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{
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struct change *change = (struct change *)obj;
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assert( obj->ops == &change_ops );
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fprintf( stderr, "Change notification fd=%p sub=%d filter=%08x\n",
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change->fd, change->subtree, change->filter );
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}
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static int change_signaled( struct object *obj, struct thread *thread )
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{
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struct change *change = (struct change *)obj;
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return change->signaled != 0;
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}
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static void change_destroy( struct object *obj )
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{
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struct change *change = (struct change *)obj;
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release_object( change->fd );
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remove_change( change );
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}
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/* enter here directly from SIGIO signal handler */
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void do_change_notify( int unix_fd )
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{
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struct list *ptr;
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/* FIXME: this is O(n) ... probably can be improved */
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LIST_FOR_EACH( ptr, &change_list )
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{
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struct change *change = LIST_ENTRY( ptr, struct change, entry );
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if (get_unix_fd( change->fd ) != unix_fd) continue;
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interlocked_xchg_add( &change->notified, 1 );
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break;
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}
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}
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/* SIGIO callback, called synchronously with the poll loop */
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void sigio_callback(void)
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{
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struct list *ptr;
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LIST_FOR_EACH( ptr, &change_list )
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{
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struct change *change = LIST_ENTRY( ptr, struct change, entry );
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long count = interlocked_xchg( &change->notified, 0 );
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if (count)
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{
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change->signaled += count;
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if (change->signaled == count) /* was it 0? */
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wake_up( &change->obj, 0 );
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}
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}
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}
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/* create a change notification */
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DECL_HANDLER(create_change_notification)
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{
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struct change *change;
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struct file *file;
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struct fd *fd;
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if (!(file = get_file_obj( current->process, req->handle, 0 ))) return;
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fd = get_obj_fd( (struct object *)file );
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release_object( file );
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if (!fd) return;
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if ((change = create_change_notification( fd, req->subtree, req->filter )))
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{
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reply->handle = alloc_handle( current->process, change,
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STANDARD_RIGHTS_REQUIRED|SYNCHRONIZE, 0 );
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release_object( change );
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}
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release_object( fd );
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}
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/* move to the next change notification */
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DECL_HANDLER(next_change_notification)
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{
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struct change *change;
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if ((change = (struct change *)get_handle_obj( current->process, req->handle,
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0, &change_ops )))
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{
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if (change->signaled > 0) change->signaled--;
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release_object( change );
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}
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}
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