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 */
150 unsigned int filter
; /* notification filter */
151 int notified
; /* SIGIO counter */
152 int want_data
; /* return change data */
153 int subtree
; /* do we want to watch subdirectories? */
154 struct list change_records
; /* data for the change */
155 struct list in_entry
; /* entry in the inode dirs list */
156 struct inode
*inode
; /* inode of the associated directory */
159 static struct fd
*dir_get_fd( struct object
*obj
);
160 static unsigned int dir_map_access( struct object
*obj
, unsigned int access
);
161 static void dir_dump( struct object
*obj
, int verbose
);
162 static void dir_destroy( struct object
*obj
);
164 static const struct object_ops dir_ops
=
166 sizeof(struct dir
), /* size */
168 add_queue
, /* add_queue */
169 remove_queue
, /* remove_queue */
170 default_fd_signaled
, /* signaled */
171 no_satisfied
, /* satisfied */
172 no_signal
, /* signal */
173 dir_get_fd
, /* get_fd */
174 dir_map_access
, /* map_access */
175 no_lookup_name
, /* lookup_name */
176 no_open_file
, /* open_file */
177 fd_close_handle
, /* close_handle */
178 dir_destroy
/* destroy */
181 static int dir_get_poll_events( struct fd
*fd
);
182 static enum server_fd_type
dir_get_info( struct fd
*fd
, int *flags
);
184 static const struct fd_ops dir_fd_ops
=
186 dir_get_poll_events
, /* get_poll_events */
187 default_poll_event
, /* poll_event */
188 no_flush
, /* flush */
189 dir_get_info
, /* get_file_info */
190 default_fd_queue_async
, /* queue_async */
191 default_fd_cancel_async
/* cancel_async */
194 static struct list change_list
= LIST_INIT(change_list
);
196 static void dnotify_adjust_changes( struct dir
*dir
)
198 #if defined(F_SETSIG) && defined(F_NOTIFY)
199 int fd
= get_unix_fd( dir
->fd
);
200 unsigned int filter
= dir
->filter
;
202 if ( 0 > fcntl( fd
, F_SETSIG
, SIGIO
) )
206 if (filter
& FILE_NOTIFY_CHANGE_FILE_NAME
)
207 val
|= DN_RENAME
| DN_DELETE
| DN_CREATE
;
208 if (filter
& FILE_NOTIFY_CHANGE_DIR_NAME
)
209 val
|= DN_RENAME
| DN_DELETE
| DN_CREATE
;
210 if (filter
& FILE_NOTIFY_CHANGE_ATTRIBUTES
)
212 if (filter
& FILE_NOTIFY_CHANGE_SIZE
)
214 if (filter
& FILE_NOTIFY_CHANGE_LAST_WRITE
)
216 if (filter
& FILE_NOTIFY_CHANGE_LAST_ACCESS
)
218 if (filter
& FILE_NOTIFY_CHANGE_CREATION
)
220 if (filter
& FILE_NOTIFY_CHANGE_SECURITY
)
222 fcntl( fd
, F_NOTIFY
, val
);
226 /* insert change in the global list */
227 static inline void insert_change( struct dir
*dir
)
231 sigemptyset( &sigset
);
232 sigaddset( &sigset
, SIGIO
);
233 sigprocmask( SIG_BLOCK
, &sigset
, NULL
);
234 list_add_head( &change_list
, &dir
->entry
);
235 sigprocmask( SIG_UNBLOCK
, &sigset
, NULL
);
238 /* remove change from the global list */
239 static inline void remove_change( struct dir
*dir
)
243 sigemptyset( &sigset
);
244 sigaddset( &sigset
, SIGIO
);
245 sigprocmask( SIG_BLOCK
, &sigset
, NULL
);
246 list_remove( &dir
->entry
);
247 sigprocmask( SIG_UNBLOCK
, &sigset
, NULL
);
250 static void dir_dump( struct object
*obj
, int verbose
)
252 struct dir
*dir
= (struct dir
*)obj
;
253 assert( obj
->ops
== &dir_ops
);
254 fprintf( stderr
, "Dirfile fd=%p filter=%08x\n", dir
->fd
, dir
->filter
);
257 /* enter here directly from SIGIO signal handler */
258 void do_change_notify( int unix_fd
)
262 /* FIXME: this is O(n) ... probably can be improved */
263 LIST_FOR_EACH_ENTRY( dir
, &change_list
, struct dir
, entry
)
265 if (get_unix_fd( dir
->fd
) != unix_fd
) continue;
266 interlocked_xchg_add( &dir
->notified
, 1 );
271 /* SIGIO callback, called synchronously with the poll loop */
272 void sigio_callback(void)
276 LIST_FOR_EACH_ENTRY( dir
, &change_list
, struct dir
, entry
)
278 if (interlocked_xchg( &dir
->notified
, 0 ))
279 fd_async_wake_up( dir
->fd
, ASYNC_TYPE_WAIT
, STATUS_NOTIFY_ENUM_DIR
);
283 static struct fd
*dir_get_fd( struct object
*obj
)
285 struct dir
*dir
= (struct dir
*)obj
;
286 assert( obj
->ops
== &dir_ops
);
287 return (struct fd
*)grab_object( dir
->fd
);
290 static unsigned int dir_map_access( struct object
*obj
, unsigned int access
)
292 if (access
& GENERIC_READ
) access
|= FILE_GENERIC_READ
;
293 if (access
& GENERIC_WRITE
) access
|= FILE_GENERIC_WRITE
;
294 if (access
& GENERIC_EXECUTE
) access
|= FILE_GENERIC_EXECUTE
;
295 if (access
& GENERIC_ALL
) access
|= FILE_ALL_ACCESS
;
296 return access
& ~(GENERIC_READ
| GENERIC_WRITE
| GENERIC_EXECUTE
| GENERIC_ALL
);
299 static struct change_record
*get_first_change_record( struct dir
*dir
)
301 struct list
*ptr
= list_head( &dir
->change_records
);
302 if (!ptr
) return NULL
;
304 return LIST_ENTRY( ptr
, struct change_record
, entry
);
307 static void dir_destroy( struct object
*obj
)
309 struct change_record
*record
;
310 struct dir
*dir
= (struct dir
*)obj
;
311 assert (obj
->ops
== &dir_ops
);
314 remove_change( dir
);
318 list_remove( &dir
->in_entry
);
319 free_inode( dir
->inode
);
322 while ((record
= get_first_change_record( dir
))) free( record
);
324 release_object( dir
->fd
);
326 if (inotify_fd
&& list_empty( &change_list
))
328 release_object( inotify_fd
);
334 get_dir_obj( struct process
*process
, obj_handle_t handle
, unsigned int access
)
336 return (struct dir
*)get_handle_obj( process
, handle
, access
, &dir_ops
);
339 static int dir_get_poll_events( struct fd
*fd
)
344 static enum server_fd_type
dir_get_info( struct fd
*fd
, int *flags
)
355 struct list ch_entry
; /* entry in the children list */
356 struct list children
; /* children of this inode */
357 struct inode
*parent
; /* parent of this inode */
358 struct list dirs
; /* directory handles watching this inode */
359 struct list ino_entry
; /* entry in the inode hash */
360 struct list wd_entry
; /* entry in the watch descriptor hash */
361 dev_t dev
; /* device number */
362 ino_t ino
; /* device's inode number */
363 int wd
; /* inotify's watch descriptor */
364 char *name
; /* basename name of the inode */
367 struct list inode_hash
[ HASH_SIZE
];
368 struct list wd_hash
[ HASH_SIZE
];
370 static int inotify_add_dir( char *path
, unsigned int filter
);
372 static struct inode
*inode_from_wd( int wd
)
374 struct list
*bucket
= &wd_hash
[ wd
% HASH_SIZE
];
377 LIST_FOR_EACH_ENTRY( inode
, bucket
, struct inode
, wd_entry
)
384 static inline struct list
*get_hash_list( dev_t dev
, ino_t ino
)
386 return &inode_hash
[ (ino
^ dev
) % HASH_SIZE
];
389 static struct inode
*find_inode( dev_t dev
, ino_t ino
)
391 struct list
*bucket
= get_hash_list( dev
, ino
);
394 LIST_FOR_EACH_ENTRY( inode
, bucket
, struct inode
, ino_entry
)
395 if (inode
->ino
== ino
&& inode
->dev
== dev
)
401 static struct inode
*create_inode( dev_t dev
, ino_t ino
)
405 inode
= malloc( sizeof *inode
);
408 list_init( &inode
->children
);
409 list_init( &inode
->dirs
);
413 inode
->parent
= NULL
;
415 list_add_tail( get_hash_list( dev
, ino
), &inode
->ino_entry
);
420 static struct inode
*get_inode( dev_t dev
, ino_t ino
)
424 inode
= find_inode( dev
, ino
);
427 return create_inode( dev
, ino
);
430 static void inode_set_wd( struct inode
*inode
, int wd
)
433 list_remove( &inode
->wd_entry
);
435 list_add_tail( &wd_hash
[ wd
% HASH_SIZE
], &inode
->wd_entry
);
438 static void inode_set_name( struct inode
*inode
, const char *name
)
441 inode
->name
= name
? strdup( name
) : NULL
;
444 static void free_inode( struct inode
*inode
)
446 int subtree
= 0, watches
= 0;
449 LIST_FOR_EACH_ENTRY( dir
, &inode
->dirs
, struct dir
, in_entry
)
451 subtree
|= dir
->subtree
;
455 if (!subtree
&& !inode
->parent
)
457 struct inode
*tmp
, *next
;
458 LIST_FOR_EACH_ENTRY_SAFE( tmp
, next
, &inode
->children
,
459 struct inode
, ch_entry
)
461 assert( tmp
!= inode
);
462 assert( tmp
->parent
== inode
);
471 list_remove( &inode
->ch_entry
);
475 inotify_remove_watch( get_unix_fd( inotify_fd
), inode
->wd
);
476 list_remove( &inode
->wd_entry
);
478 list_remove( &inode
->ino_entry
);
484 static struct inode
*inode_add( struct inode
*parent
,
485 dev_t dev
, ino_t ino
, const char *name
)
489 inode
= get_inode( dev
, ino
);
495 list_add_tail( &parent
->children
, &inode
->ch_entry
);
496 inode
->parent
= parent
;
497 assert( inode
!= parent
);
499 inode_set_name( inode
, name
);
504 static struct inode
*inode_from_name( struct inode
*inode
, const char *name
)
508 LIST_FOR_EACH_ENTRY( i
, &inode
->children
, struct inode
, ch_entry
)
509 if (i
->name
&& !strcmp( i
->name
, name
))
514 static int inotify_get_poll_events( struct fd
*fd
);
515 static void inotify_poll_event( struct fd
*fd
, int event
);
517 static const struct fd_ops inotify_fd_ops
=
519 inotify_get_poll_events
, /* get_poll_events */
520 inotify_poll_event
, /* poll_event */
521 no_flush
, /* flush */
522 no_get_file_info
, /* get_file_info */
523 default_fd_queue_async
, /* queue_async */
524 default_fd_cancel_async
, /* cancel_async */
527 static int inotify_get_poll_events( struct fd
*fd
)
532 static void inotify_do_change_notify( struct dir
*dir
, unsigned int action
,
533 const char *relpath
)
535 struct change_record
*record
;
537 assert( dir
->obj
.ops
== &dir_ops
);
541 size_t len
= strlen(relpath
);
542 record
= malloc( offsetof(struct change_record
, name
[len
]) );
546 record
->action
= action
;
547 memcpy( record
->name
, relpath
, len
);
550 list_add_tail( &dir
->change_records
, &record
->entry
);
553 fd_async_wake_up( dir
->fd
, ASYNC_TYPE_WAIT
, STATUS_ALERTED
);
556 static unsigned int filter_from_event( struct inotify_event
*ie
)
558 unsigned int filter
= 0;
560 if (ie
->mask
& (IN_MOVED_FROM
| IN_MOVED_TO
| IN_DELETE
| IN_CREATE
))
561 filter
|= FILE_NOTIFY_CHANGE_FILE_NAME
| FILE_NOTIFY_CHANGE_DIR_NAME
;
562 if (ie
->mask
& IN_MODIFY
)
563 filter
|= FILE_NOTIFY_CHANGE_SIZE
| FILE_NOTIFY_CHANGE_LAST_WRITE
;
564 if (ie
->mask
& IN_ATTRIB
)
565 filter
|= FILE_NOTIFY_CHANGE_ATTRIBUTES
| FILE_NOTIFY_CHANGE_SECURITY
;
566 if (ie
->mask
& IN_ACCESS
)
567 filter
|= FILE_NOTIFY_CHANGE_LAST_ACCESS
;
568 if (ie
->mask
& IN_CREATE
)
569 filter
|= FILE_NOTIFY_CHANGE_CREATION
;
574 /* scan up the parent directories for watches */
575 static unsigned int filter_from_inode( struct inode
*inode
, int is_parent
)
577 unsigned int filter
= 0;
580 /* combine filters from parents watching subtrees */
583 LIST_FOR_EACH_ENTRY( dir
, &inode
->dirs
, struct dir
, in_entry
)
584 if (dir
->subtree
|| !is_parent
)
585 filter
|= dir
->filter
;
587 inode
= inode
->parent
;
593 static char *inode_get_path( struct inode
*inode
, int sz
)
602 head
= list_head( &inode
->dirs
);
605 int unix_fd
= get_unix_fd( LIST_ENTRY( head
, struct dir
, in_entry
)->fd
);
606 path
= malloc ( 32 + sz
);
608 sprintf( path
, "/proc/self/fd/%u/", unix_fd
);
615 len
= strlen( inode
->name
);
616 path
= inode_get_path( inode
->parent
, sz
+ len
+ 1 );
620 strcat( path
, inode
->name
);
626 static int inode_check_dir( struct inode
*parent
, const char *name
)
634 path
= inode_get_path( parent
, strlen(name
) );
638 strcat( path
, name
);
640 r
= stat( path
, &st
);
643 if (!S_ISDIR(st
.st_mode
))
651 filter
= filter_from_inode( parent
, 1 );
655 inode
= inode_add( parent
, st
.st_dev
, st
.st_ino
, name
);
656 if (!inode
|| inode
->wd
!= -1)
659 wd
= inotify_add_dir( path
, filter
);
661 inode_set_wd( inode
, wd
);
670 static int prepend( char **path
, const char *segment
)
675 extra
= strlen( segment
) + 1;
678 int len
= strlen( *path
) + 1;
679 p
= realloc( *path
, len
+ extra
);
681 memmove( &p
[ extra
], p
, len
);
682 p
[ extra
- 1 ] = '/';
683 memcpy( p
, segment
, extra
- 1 );
689 memcpy( p
, segment
, extra
);
697 static void inotify_notify_all( struct inotify_event
*ie
)
699 unsigned int filter
, action
;
700 struct inode
*inode
, *i
;
704 inode
= inode_from_wd( ie
->wd
);
707 fprintf( stderr
, "no inode matches %d\n", ie
->wd
);
711 filter
= filter_from_event( ie
);
713 if (ie
->mask
& IN_CREATE
)
715 switch (inode_check_dir( inode
, ie
->name
))
718 filter
&= ~FILE_NOTIFY_CHANGE_FILE_NAME
;
721 filter
&= ~FILE_NOTIFY_CHANGE_DIR_NAME
;
725 /* Maybe the file disappeared before we could check it? */
727 action
= FILE_ACTION_ADDED
;
729 else if (ie
->mask
& IN_DELETE
)
730 action
= FILE_ACTION_REMOVED
;
732 action
= FILE_ACTION_MODIFIED
;
735 * Work our way up the inode hierarchy
736 * extending the relative path as we go
737 * and notifying all recursive watches.
739 if (!prepend( &path
, ie
->name
))
742 for (i
= inode
; i
; i
= i
->parent
)
744 LIST_FOR_EACH_ENTRY( dir
, &i
->dirs
, struct dir
, in_entry
)
745 if ((filter
& dir
->filter
) && (i
==inode
|| dir
->subtree
))
746 inotify_do_change_notify( dir
, action
, path
);
748 if (!i
->name
|| !prepend( &path
, i
->name
))
754 if (ie
->mask
& IN_DELETE
)
756 i
= inode_from_name( inode
, ie
->name
);
762 static void inotify_poll_event( struct fd
*fd
, int event
)
766 struct inotify_event
*ie
;
768 unix_fd
= get_unix_fd( fd
);
769 r
= read( unix_fd
, buffer
, sizeof buffer
);
772 fprintf(stderr
,"inotify_poll_event(): inotify read failed!\n");
776 for( ofs
= 0; ofs
< r
- offsetof(struct inotify_event
, name
); )
778 ie
= (struct inotify_event
*) &buffer
[ofs
];
781 ofs
+= offsetof( struct inotify_event
, name
[ie
->len
] );
783 inotify_notify_all( ie
);
787 static inline struct fd
*create_inotify_fd( void )
791 unix_fd
= inotify_init();
794 return create_anonymous_fd( &inotify_fd_ops
, unix_fd
, NULL
);
797 static int map_flags( unsigned int filter
)
801 /* always watch these so we can track subdirectories in recursive watches */
802 mask
= (IN_MOVED_FROM
| IN_MOVED_TO
| IN_DELETE
| IN_CREATE
| IN_DELETE_SELF
);
804 if (filter
& FILE_NOTIFY_CHANGE_ATTRIBUTES
)
806 if (filter
& FILE_NOTIFY_CHANGE_SIZE
)
808 if (filter
& FILE_NOTIFY_CHANGE_LAST_WRITE
)
810 if (filter
& FILE_NOTIFY_CHANGE_LAST_ACCESS
)
812 if (filter
& FILE_NOTIFY_CHANGE_SECURITY
)
818 static int inotify_add_dir( char *path
, unsigned int filter
)
820 int wd
= inotify_add_watch( get_unix_fd( inotify_fd
),
821 path
, map_flags( filter
) );
823 set_fd_events( inotify_fd
, POLLIN
);
827 static int init_inotify( void )
834 inotify_fd
= create_inotify_fd();
838 for (i
=0; i
<HASH_SIZE
; i
++)
840 list_init( &inode_hash
[i
] );
841 list_init( &wd_hash
[i
] );
847 static int inotify_adjust_changes( struct dir
*dir
)
858 unix_fd
= get_unix_fd( dir
->fd
);
863 /* check if this fd is already being watched */
864 if (-1 == fstat( unix_fd
, &st
))
867 inode
= get_inode( st
.st_dev
, st
.st_ino
);
869 inode
= create_inode( st
.st_dev
, st
.st_ino
);
872 list_add_tail( &inode
->dirs
, &dir
->in_entry
);
876 filter
= filter_from_inode( inode
, 0 );
878 sprintf( path
, "/proc/self/fd/%u", unix_fd
);
879 wd
= inotify_add_dir( path
, filter
);
880 if (wd
== -1) return 0;
882 inode_set_wd( inode
, wd
);
887 static char *get_basename( const char *link
)
889 char *buffer
, *name
= NULL
;
894 buffer
= malloc( n
);
895 if (!buffer
) return NULL
;
897 r
= readlink( link
, buffer
, n
);
912 while (r
> 0 && name
[ r
- 1 ] == '/' )
916 name
= strrchr( name
, '/' );
918 name
= strdup( &name
[1] );
925 static int dir_add_to_existing_notify( struct dir
*dir
)
927 struct inode
*inode
, *parent
;
928 unsigned int filter
= 0;
929 struct stat st
, st_new
;
930 char link
[35], *name
;
936 unix_fd
= get_unix_fd( dir
->fd
);
938 /* check if it's in the list of inodes we want to watch */
939 if (-1 == fstat( unix_fd
, &st_new
))
941 inode
= find_inode( st_new
.st_dev
, st_new
.st_ino
);
945 /* lookup the parent */
946 sprintf( link
, "/proc/self/fd/%u/..", unix_fd
);
947 if (-1 == stat( link
, &st
))
951 * If there's no parent, stop. We could keep going adding
952 * ../ to the path until we hit the root of the tree or
953 * find a recursively watched ancestor.
954 * Assume it's too expensive to search up the tree for now.
956 parent
= find_inode( st
.st_dev
, st
.st_ino
);
960 if (parent
->wd
== -1)
963 filter
= filter_from_inode( parent
, 1 );
967 sprintf( link
, "/proc/self/fd/%u", unix_fd
);
968 name
= get_basename( link
);
971 inode
= inode_add( parent
, st_new
.st_dev
, st_new
.st_ino
, name
);
976 /* Couldn't find this inode at the start of the function, must be new */
977 assert( inode
->wd
== -1 );
979 wd
= inotify_add_dir( link
, filter
);
981 inode_set_wd( inode
, wd
);
988 static int init_inotify( void )
993 static int inotify_adjust_changes( struct dir
*dir
)
998 static void free_inode( struct inode
*inode
)
1003 static int dir_add_to_existing_notify( struct dir
*dir
)
1008 #endif /* USE_INOTIFY */
1010 struct object
*create_dir_obj( struct fd
*fd
)
1014 dir
= alloc_object( &dir_ops
);
1018 list_init( &dir
->change_records
);
1025 set_fd_user( fd
, &dir_fd_ops
, &dir
->obj
);
1027 dir_add_to_existing_notify( dir
);
1032 /* enable change notifications for a directory */
1033 DECL_HANDLER(read_directory_changes
)
1036 struct async
*async
;
1040 set_error(STATUS_INVALID_PARAMETER
);
1044 dir
= get_dir_obj( current
->process
, req
->handle
, 0 );
1048 /* requests don't timeout */
1049 if (!(async
= fd_queue_async( dir
->fd
, &req
->async
, ASYNC_TYPE_WAIT
, 0 ))) goto end
;
1051 /* assign it once */
1055 insert_change( dir
);
1056 dir
->filter
= req
->filter
;
1057 dir
->subtree
= req
->subtree
;
1058 dir
->want_data
= req
->want_data
;
1061 /* if there's already a change in the queue, send it */
1062 if (!list_empty( &dir
->change_records
))
1063 fd_async_wake_up( dir
->fd
, ASYNC_TYPE_WAIT
, STATUS_ALERTED
);
1065 /* setup the real notification */
1066 if (!inotify_adjust_changes( dir
))
1067 dnotify_adjust_changes( dir
);
1069 release_object( async
);
1070 set_error(STATUS_PENDING
);
1073 release_object( dir
);
1076 DECL_HANDLER(read_change
)
1078 struct change_record
*record
;
1081 dir
= get_dir_obj( current
->process
, req
->handle
, 0 );
1085 if ((record
= get_first_change_record( dir
)) != NULL
)
1087 reply
->action
= record
->action
;
1088 set_reply_data( record
->name
, record
->len
);
1092 set_error( STATUS_NO_DATA_DETECTED
);
1094 release_object( dir
);