2 * Server-side change notification management
4 * Copyright (C) 1998 Alexandre Julliard
5 * Copyright (C) 2006 Mike McCormack
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
23 #include "wine/port.h"
31 #include <sys/types.h>
35 #ifdef HAVE_SYS_ERRNO_H
36 #include <sys/errno.h>
40 #define WIN32_NO_STATUS
54 #define DN_ACCESS 0x00000001 /* File accessed */
55 #define DN_MODIFY 0x00000002 /* File modified */
56 #define DN_CREATE 0x00000004 /* File created */
57 #define DN_DELETE 0x00000008 /* File removed */
58 #define DN_RENAME 0x00000010 /* File renamed */
59 #define DN_ATTRIB 0x00000020 /* File changed attibutes */
60 #define DN_MULTISHOT 0x80000000 /* Don't remove notifier */
66 #if defined(__linux__) && defined(__i386__)
68 #define SYS_inotify_init 291
69 #define SYS_inotify_add_watch 292
70 #define SYS_inotify_rm_watch 293
72 struct inotify_event {
80 #define IN_ACCESS 0x00000001
81 #define IN_MODIFY 0x00000002
82 #define IN_ATTRIB 0x00000004
83 #define IN_CLOSE_WRITE 0x00000008
84 #define IN_CLOSE_NOWRITE 0x00000010
85 #define IN_OPEN 0x00000020
86 #define IN_MOVED_FROM 0x00000040
87 #define IN_MOVED_TO 0x00000080
88 #define IN_CREATE 0x00000100
89 #define IN_DELETE 0x00000200
90 #define IN_DELETE_SELF 0x00000400
92 static inline int inotify_init( void )
95 __asm__ __volatile__( "int $0x80"
97 : "0" (SYS_inotify_init));
98 if (ret<0) { errno = -ret; ret = -1; }
102 static inline int inotify_add_watch( int fd, const char *name, unsigned int mask )
105 __asm__ __volatile__( "pushl %%ebx;\n\t"
109 : "=a" (ret) : "0" (SYS_inotify_add_watch),
110 "r" (fd), "c" (name), "d" (mask) );
111 if (ret<0) { errno = -ret; ret = -1; }
115 static inline int inotify_remove_watch( int fd, int wd )
118 __asm__ __volatile__( "pushl %%ebx;\n\t"
122 : "=a" (ret) : "0" (SYS_inotify_rm_watch),
123 "r" (fd), "c" (wd) );
124 if (ret<0) { errno = -ret; ret = -1; }
134 static void free_inode( struct inode *inode );
136 static struct fd *inotify_fd;
138 struct change_record {
147 struct object obj; /* object header */
148 struct fd *fd; /* file descriptor to the directory */
149 struct list entry; /* entry in global change notifications list */
151 unsigned int filter; /* notification filter */
152 int notified; /* SIGIO counter */
153 int want_data; /* return change data */
154 long signaled; /* the file changed */
155 int subtree; /* do we want to watch subdirectories? */
156 struct list change_q; /* change readers */
157 struct list change_records; /* data for the change */
158 struct list in_entry; /* entry in the inode dirs list */
159 struct inode *inode; /* inode of the associated directory */
162 static struct fd *dir_get_fd( struct object *obj );
163 static unsigned int dir_map_access( struct object *obj, unsigned int access );
164 static void dir_dump( struct object *obj, int verbose );
165 static void dir_destroy( struct object *obj );
166 static int dir_signaled( struct object *obj, struct thread *thread );
168 static const struct object_ops dir_ops =
170 sizeof(struct dir), /* size */
172 add_queue, /* add_queue */
173 remove_queue, /* remove_queue */
174 dir_signaled, /* signaled */
175 no_satisfied, /* satisfied */
176 no_signal, /* signal */
177 dir_get_fd, /* get_fd */
178 dir_map_access, /* map_access */
179 no_lookup_name, /* lookup_name */
180 no_open_file, /* open_file */
181 fd_close_handle, /* close_handle */
182 dir_destroy /* destroy */
185 static int dir_get_poll_events( struct fd *fd );
186 static enum server_fd_type dir_get_info( struct fd *fd, int *flags );
187 static void dir_cancel_async( struct fd *fd );
189 static const struct fd_ops dir_fd_ops =
191 dir_get_poll_events, /* get_poll_events */
192 default_poll_event, /* poll_event */
193 no_flush, /* flush */
194 dir_get_info, /* get_file_info */
195 default_fd_queue_async, /* queue_async */
196 dir_cancel_async /* cancel_async */
199 static struct list change_list = LIST_INIT(change_list);
201 static void dnotify_adjust_changes( struct dir *dir )
203 #if defined(F_SETSIG) && defined(F_NOTIFY)
204 int fd = get_unix_fd( dir->fd );
205 unsigned int filter = dir->filter;
207 if ( 0 > fcntl( fd, F_SETSIG, SIGIO) )
211 if (filter & FILE_NOTIFY_CHANGE_FILE_NAME)
212 val |= DN_RENAME | DN_DELETE | DN_CREATE;
213 if (filter & FILE_NOTIFY_CHANGE_DIR_NAME)
214 val |= DN_RENAME | DN_DELETE | DN_CREATE;
215 if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
217 if (filter & FILE_NOTIFY_CHANGE_SIZE)
219 if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
221 if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
223 if (filter & FILE_NOTIFY_CHANGE_CREATION)
225 if (filter & FILE_NOTIFY_CHANGE_SECURITY)
227 fcntl( fd, F_NOTIFY, val );
231 /* insert change in the global list */
232 static inline void insert_change( struct dir *dir )
236 sigemptyset( &sigset );
237 sigaddset( &sigset, SIGIO );
238 sigprocmask( SIG_BLOCK, &sigset, NULL );
239 list_add_head( &change_list, &dir->entry );
240 sigprocmask( SIG_UNBLOCK, &sigset, NULL );
243 /* remove change from the global list */
244 static inline void remove_change( struct dir *dir )
248 sigemptyset( &sigset );
249 sigaddset( &sigset, SIGIO );
250 sigprocmask( SIG_BLOCK, &sigset, NULL );
251 list_remove( &dir->entry );
252 sigprocmask( SIG_UNBLOCK, &sigset, NULL );
255 static void dir_dump( struct object *obj, int verbose )
257 struct dir *dir = (struct dir *)obj;
258 assert( obj->ops == &dir_ops );
259 fprintf( stderr, "Dirfile fd=%p event=%p filter=%08x\n",
260 dir->fd, dir->event, dir->filter );
263 static int dir_signaled( struct object *obj, struct thread *thread )
265 struct dir *dir = (struct dir *)obj;
266 assert (obj->ops == &dir_ops);
267 return (dir->event == NULL) && dir->signaled;
270 /* enter here directly from SIGIO signal handler */
271 void do_change_notify( int unix_fd )
275 /* FIXME: this is O(n) ... probably can be improved */
276 LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )
278 if (get_unix_fd( dir->fd ) != unix_fd) continue;
279 interlocked_xchg_add( &dir->notified, 1 );
284 static void dir_signal_changed( struct dir *dir )
286 if (!dir->event) wake_up( &dir->obj, 0 );
289 /* SIGIO callback, called synchronously with the poll loop */
290 void sigio_callback(void)
294 LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )
296 long count = interlocked_xchg( &dir->notified, 0 );
299 dir->signaled += count;
300 if (dir->signaled == count) /* was it 0? */
301 dir_signal_changed( dir );
306 static struct fd *dir_get_fd( struct object *obj )
308 struct dir *dir = (struct dir *)obj;
309 assert( obj->ops == &dir_ops );
310 return (struct fd *)grab_object( dir->fd );
313 static unsigned int dir_map_access( struct object *obj, unsigned int access )
315 if (access & GENERIC_READ) access |= FILE_GENERIC_READ;
316 if (access & GENERIC_WRITE) access |= FILE_GENERIC_WRITE;
317 if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
318 if (access & GENERIC_ALL) access |= FILE_ALL_ACCESS;
319 return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
322 static struct change_record *get_first_change_record( struct dir *dir )
324 struct list *ptr = list_head( &dir->change_records );
325 if (!ptr) return NULL;
327 return LIST_ENTRY( ptr, struct change_record, entry );
330 static void dir_destroy( struct object *obj )
332 struct change_record *record;
333 struct dir *dir = (struct dir *)obj;
334 assert (obj->ops == &dir_ops);
337 remove_change( dir );
341 list_remove( &dir->in_entry );
342 free_inode( dir->inode );
345 async_terminate_queue( &dir->change_q, STATUS_CANCELLED );
346 while ((record = get_first_change_record( dir ))) free( record );
348 if (dir->event) release_object( dir->event );
349 release_object( dir->fd );
351 if (inotify_fd && list_empty( &change_list ))
353 release_object( inotify_fd );
359 get_dir_obj( struct process *process, obj_handle_t handle, unsigned int access )
361 return (struct dir *)get_handle_obj( process, handle, access, &dir_ops );
364 static int dir_get_poll_events( struct fd *fd )
369 static enum server_fd_type dir_get_info( struct fd *fd, int *flags )
375 static void dir_cancel_async( struct fd *fd )
377 struct dir *dir = (struct dir *) get_fd_user( fd );
378 async_terminate_queue( &dir->change_q, STATUS_CANCELLED );
387 struct list ch_entry; /* entry in the children list */
388 struct list children; /* children of this inode */
389 struct inode *parent; /* parent of this inode */
390 struct list dirs; /* directory handles watching this inode */
391 struct list ino_entry; /* entry in the inode hash */
392 struct list wd_entry; /* entry in the watch descriptor hash */
393 dev_t dev; /* device number */
394 ino_t ino; /* device's inode number */
395 int wd; /* inotify's watch descriptor */
396 char *name; /* basename name of the inode */
399 struct list inode_hash[ HASH_SIZE ];
400 struct list wd_hash[ HASH_SIZE ];
402 static int inotify_add_dir( char *path, unsigned int filter );
404 static struct inode *inode_from_wd( int wd )
406 struct list *bucket = &wd_hash[ wd % HASH_SIZE ];
409 LIST_FOR_EACH_ENTRY( inode, bucket, struct inode, wd_entry )
416 static inline struct list *get_hash_list( dev_t dev, ino_t ino )
418 return &inode_hash[ (ino ^ dev) % HASH_SIZE ];
421 static struct inode *find_inode( dev_t dev, ino_t ino )
423 struct list *bucket = get_hash_list( dev, ino );
426 LIST_FOR_EACH_ENTRY( inode, bucket, struct inode, ino_entry )
427 if (inode->ino == ino && inode->dev == dev)
433 static struct inode *create_inode( dev_t dev, ino_t ino )
437 inode = malloc( sizeof *inode );
440 list_init( &inode->children );
441 list_init( &inode->dirs );
445 inode->parent = NULL;
447 list_add_tail( get_hash_list( dev, ino ), &inode->ino_entry );
452 static struct inode *get_inode( dev_t dev, ino_t ino )
456 inode = find_inode( dev, ino );
459 return create_inode( dev, ino );
462 static void inode_set_wd( struct inode *inode, int wd )
465 list_remove( &inode->wd_entry );
467 list_add_tail( &wd_hash[ wd % HASH_SIZE ], &inode->wd_entry );
470 static void inode_set_name( struct inode *inode, const char *name )
473 inode->name = name ? strdup( name ) : NULL;
476 static void free_inode( struct inode *inode )
478 int subtree = 0, watches = 0;
481 LIST_FOR_EACH_ENTRY( dir, &inode->dirs, struct dir, in_entry )
483 subtree |= dir->subtree;
487 if (!subtree && !inode->parent)
489 struct inode *tmp, *next;
490 LIST_FOR_EACH_ENTRY_SAFE( tmp, next, &inode->children,
491 struct inode, ch_entry )
493 assert( tmp != inode );
494 assert( tmp->parent == inode );
503 list_remove( &inode->ch_entry );
507 inotify_remove_watch( get_unix_fd( inotify_fd ), inode->wd );
508 list_remove( &inode->wd_entry );
510 list_remove( &inode->ino_entry );
516 static struct inode *inode_add( struct inode *parent,
517 dev_t dev, ino_t ino, const char *name )
521 inode = get_inode( dev, ino );
527 list_add_tail( &parent->children, &inode->ch_entry );
528 inode->parent = parent;
529 assert( inode != parent );
531 inode_set_name( inode, name );
536 static struct inode *inode_from_name( struct inode *inode, const char *name )
540 LIST_FOR_EACH_ENTRY( i, &inode->children, struct inode, ch_entry )
541 if (i->name && !strcmp( i->name, name ))
546 static int inotify_get_poll_events( struct fd *fd );
547 static void inotify_poll_event( struct fd *fd, int event );
549 static const struct fd_ops inotify_fd_ops =
551 inotify_get_poll_events, /* get_poll_events */
552 inotify_poll_event, /* poll_event */
553 no_flush, /* flush */
554 no_get_file_info, /* get_file_info */
555 default_fd_queue_async, /* queue_async */
556 default_fd_cancel_async, /* cancel_async */
559 static int inotify_get_poll_events( struct fd *fd )
564 static void inotify_do_change_notify( struct dir *dir, unsigned int action,
565 const char *relpath )
567 struct change_record *record;
569 assert( dir->obj.ops == &dir_ops );
573 size_t len = strlen(relpath);
574 record = malloc( offsetof(struct change_record, name[len]) );
578 record->action = action;
579 memcpy( record->name, relpath, len );
582 list_add_tail( &dir->change_records, &record->entry );
585 if (!list_empty( &dir->change_q ))
586 async_terminate_head( &dir->change_q, STATUS_ALERTED );
589 static unsigned int filter_from_event( struct inotify_event *ie )
591 unsigned int filter = 0;
593 if (ie->mask & (IN_MOVED_FROM | IN_MOVED_TO | IN_DELETE | IN_CREATE))
594 filter |= FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME;
595 if (ie->mask & IN_MODIFY)
596 filter |= FILE_NOTIFY_CHANGE_SIZE | FILE_NOTIFY_CHANGE_LAST_WRITE;
597 if (ie->mask & IN_ATTRIB)
598 filter |= FILE_NOTIFY_CHANGE_ATTRIBUTES | FILE_NOTIFY_CHANGE_SECURITY;
599 if (ie->mask & IN_ACCESS)
600 filter |= FILE_NOTIFY_CHANGE_LAST_ACCESS;
601 if (ie->mask & IN_CREATE)
602 filter |= FILE_NOTIFY_CHANGE_CREATION;
607 /* scan up the parent directories for watches */
608 static unsigned int filter_from_inode( struct inode *inode, int is_parent )
610 unsigned int filter = 0;
613 /* combine filters from parents watching subtrees */
616 LIST_FOR_EACH_ENTRY( dir, &inode->dirs, struct dir, in_entry )
617 if (dir->subtree || !is_parent)
618 filter |= dir->filter;
620 inode = inode->parent;
626 static char *inode_get_path( struct inode *inode, int sz )
635 head = list_head( &inode->dirs );
638 int unix_fd = get_unix_fd( LIST_ENTRY( head, struct dir, in_entry )->fd );
639 path = malloc ( 32 + sz );
641 sprintf( path, "/proc/self/fd/%u/", unix_fd );
648 len = strlen( inode->name );
649 path = inode_get_path( inode->parent, sz + len + 1 );
653 strcat( path, inode->name );
659 static int inode_check_dir( struct inode *parent, const char *name )
667 path = inode_get_path( parent, strlen(name) );
671 strcat( path, name );
673 r = stat( path, &st );
676 if (!S_ISDIR(st.st_mode))
684 filter = filter_from_inode( parent, 1 );
688 inode = inode_add( parent, st.st_dev, st.st_ino, name );
689 if (!inode || inode->wd != -1)
692 wd = inotify_add_dir( path, filter );
694 inode_set_wd( inode, wd );
703 static int prepend( char **path, const char *segment )
708 extra = strlen( segment ) + 1;
711 int len = strlen( *path ) + 1;
712 p = realloc( *path, len + extra );
714 memmove( &p[ extra ], p, len );
715 p[ extra - 1 ] = '/';
716 memcpy( p, segment, extra - 1 );
722 memcpy( p, segment, extra );
730 static void inotify_notify_all( struct inotify_event *ie )
732 unsigned int filter, action;
733 struct inode *inode, *i;
737 inode = inode_from_wd( ie->wd );
740 fprintf( stderr, "no inode matches %d\n", ie->wd);
744 filter = filter_from_event( ie );
746 if (ie->mask & IN_CREATE)
748 switch (inode_check_dir( inode, ie->name ))
751 filter &= ~FILE_NOTIFY_CHANGE_FILE_NAME;
754 filter &= ~FILE_NOTIFY_CHANGE_DIR_NAME;
758 /* Maybe the file disappeared before we could check it? */
760 action = FILE_ACTION_ADDED;
762 else if (ie->mask & IN_DELETE)
763 action = FILE_ACTION_REMOVED;
765 action = FILE_ACTION_MODIFIED;
768 * Work our way up the inode hierarchy
769 * extending the relative path as we go
770 * and notifying all recursive watches.
772 if (!prepend( &path, ie->name ))
775 for (i = inode; i; i = i->parent)
777 LIST_FOR_EACH_ENTRY( dir, &i->dirs, struct dir, in_entry )
778 if ((filter & dir->filter) && (i==inode || dir->subtree))
779 inotify_do_change_notify( dir, action, path );
781 if (!i->name || !prepend( &path, i->name ))
787 if (ie->mask & IN_DELETE)
789 i = inode_from_name( inode, ie->name );
795 static void inotify_poll_event( struct fd *fd, int event )
799 struct inotify_event *ie;
801 unix_fd = get_unix_fd( fd );
802 r = read( unix_fd, buffer, sizeof buffer );
805 fprintf(stderr,"inotify_poll_event(): inotify read failed!\n");
809 for( ofs = 0; ofs < r - offsetof(struct inotify_event, name); )
811 ie = (struct inotify_event*) &buffer[ofs];
814 ofs += offsetof( struct inotify_event, name[ie->len] );
816 inotify_notify_all( ie );
820 static inline struct fd *create_inotify_fd( void )
824 unix_fd = inotify_init();
827 return create_anonymous_fd( &inotify_fd_ops, unix_fd, NULL );
830 static int map_flags( unsigned int filter )
834 /* always watch these so we can track subdirectories in recursive watches */
835 mask = (IN_MOVED_FROM | IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF);
837 if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
839 if (filter & FILE_NOTIFY_CHANGE_SIZE)
841 if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
843 if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
845 if (filter & FILE_NOTIFY_CHANGE_SECURITY)
851 static int inotify_add_dir( char *path, unsigned int filter )
853 int wd = inotify_add_watch( get_unix_fd( inotify_fd ),
854 path, map_flags( filter ) );
856 set_fd_events( inotify_fd, POLLIN );
860 static int init_inotify( void )
867 inotify_fd = create_inotify_fd();
871 for (i=0; i<HASH_SIZE; i++)
873 list_init( &inode_hash[i] );
874 list_init( &wd_hash[i] );
880 static int inotify_adjust_changes( struct dir *dir )
891 unix_fd = get_unix_fd( dir->fd );
896 /* check if this fd is already being watched */
897 if (-1 == fstat( unix_fd, &st ))
900 inode = get_inode( st.st_dev, st.st_ino );
902 inode = create_inode( st.st_dev, st.st_ino );
905 list_add_tail( &inode->dirs, &dir->in_entry );
909 filter = filter_from_inode( inode, 0 );
911 sprintf( path, "/proc/self/fd/%u", unix_fd );
912 wd = inotify_add_dir( path, filter );
913 if (wd == -1) return 0;
915 inode_set_wd( inode, wd );
920 static char *get_basename( const char *link )
922 char *buffer, *name = NULL;
927 buffer = malloc( n );
928 if (!buffer) return NULL;
930 r = readlink( link, buffer, n );
945 while (r > 0 && name[ r - 1 ] == '/' )
949 name = strrchr( name, '/' );
951 name = strdup( &name[1] );
958 static int dir_add_to_existing_notify( struct dir *dir )
960 struct inode *inode, *parent;
961 unsigned int filter = 0;
962 struct stat st, st_new;
963 char link[35], *name;
969 unix_fd = get_unix_fd( dir->fd );
971 /* check if it's in the list of inodes we want to watch */
972 if (-1 == fstat( unix_fd, &st_new ))
974 inode = find_inode( st_new.st_dev, st_new.st_ino );
978 /* lookup the parent */
979 sprintf( link, "/proc/self/fd/%u/..", unix_fd );
980 if (-1 == stat( link, &st ))
984 * If there's no parent, stop. We could keep going adding
985 * ../ to the path until we hit the root of the tree or
986 * find a recursively watched ancestor.
987 * Assume it's too expensive to search up the tree for now.
989 parent = find_inode( st.st_dev, st.st_ino );
993 if (parent->wd == -1)
996 filter = filter_from_inode( parent, 1 );
1000 sprintf( link, "/proc/self/fd/%u", unix_fd );
1001 name = get_basename( link );
1004 inode = inode_add( parent, st_new.st_dev, st_new.st_ino, name );
1009 /* Couldn't find this inode at the start of the function, must be new */
1010 assert( inode->wd == -1 );
1012 wd = inotify_add_dir( link, filter );
1014 inode_set_wd( inode, wd );
1021 static int init_inotify( void )
1026 static int inotify_adjust_changes( struct dir *dir )
1031 static void free_inode( struct inode *inode )
1036 static int dir_add_to_existing_notify( struct dir *dir )
1041 #endif /* USE_INOTIFY */
1043 struct object *create_dir_obj( struct fd *fd )
1047 dir = alloc_object( &dir_ops );
1051 list_init( &dir->change_q );
1052 list_init( &dir->change_records );
1061 set_fd_user( fd, &dir_fd_ops, &dir->obj );
1063 dir_add_to_existing_notify( dir );
1068 /* enable change notifications for a directory */
1069 DECL_HANDLER(read_directory_changes)
1071 struct event *event = NULL;
1076 set_error(STATUS_INVALID_PARAMETER);
1080 dir = get_dir_obj( current->process, req->handle, 0 );
1084 /* possibly send changes through an event flag */
1085 if (req->async.event &&
1086 !(event = get_event_obj( current->process, req->async.event, EVENT_MODIFY_STATE )))
1089 /* discard the current data, and move onto the next event */
1090 if (dir->event) release_object( dir->event );
1093 /* requests don't timeout */
1094 if (!create_async( current, NULL, &dir->change_q, &req->async )) goto end;
1096 /* assign it once */
1100 insert_change( dir );
1101 dir->filter = req->filter;
1102 dir->subtree = req->subtree;
1103 dir->want_data = req->want_data;
1106 /* remove any notifications */
1107 if (dir->signaled>0)
1110 /* if there's already a change in the queue, send it */
1111 if (!list_empty( &dir->change_q ) &&
1112 !list_empty( &dir->change_records ))
1113 async_terminate_head( &dir->change_q, STATUS_ALERTED );
1115 /* setup the real notification */
1116 if (!inotify_adjust_changes( dir ))
1117 dnotify_adjust_changes( dir );
1119 set_error(STATUS_PENDING);
1122 release_object( dir );
1125 DECL_HANDLER(read_change)
1127 struct change_record *record;
1130 dir = get_dir_obj( current->process, req->handle, 0 );
1134 if ((record = get_first_change_record( dir )) != NULL)
1136 reply->action = record->action;
1137 set_reply_data( record->name, record->len );
1141 set_error( STATUS_NO_DATA_DETECTED );
1145 dir_signal_changed( dir );
1147 release_object( dir );