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>
40 #define WIN32_NO_STATUS
56 #define DN_ACCESS 0x00000001 /* File accessed */
57 #define DN_MODIFY 0x00000002 /* File modified */
58 #define DN_CREATE 0x00000004 /* File created */
59 #define DN_DELETE 0x00000008 /* File removed */
60 #define DN_RENAME 0x00000010 /* File renamed */
61 #define DN_ATTRIB 0x00000020 /* File changed attributes */
62 #define DN_MULTISHOT 0x80000000 /* Don't remove notifier */
68 #ifdef HAVE_SYS_INOTIFY_H
69 #include <sys/inotify.h>
71 #elif defined(__linux__) && defined(__i386__)
73 #define SYS_inotify_init 291
74 #define SYS_inotify_add_watch 292
75 #define SYS_inotify_rm_watch 293
77 struct inotify_event
{
85 #define IN_ACCESS 0x00000001
86 #define IN_MODIFY 0x00000002
87 #define IN_ATTRIB 0x00000004
88 #define IN_CLOSE_WRITE 0x00000008
89 #define IN_CLOSE_NOWRITE 0x00000010
90 #define IN_OPEN 0x00000020
91 #define IN_MOVED_FROM 0x00000040
92 #define IN_MOVED_TO 0x00000080
93 #define IN_CREATE 0x00000100
94 #define IN_DELETE 0x00000200
95 #define IN_DELETE_SELF 0x00000400
97 #define IN_ISDIR 0x40000000
99 static inline int inotify_init( void )
101 return syscall( SYS_inotify_init
);
104 static inline int inotify_add_watch( int fd
, const char *name
, unsigned int mask
)
106 return syscall( SYS_inotify_add_watch
, fd
, name
, mask
);
109 static inline int inotify_rm_watch( int fd
, int wd
)
111 return syscall( SYS_inotify_rm_watch
, fd
, wd
);
120 static void free_inode( struct inode
*inode
);
122 static struct fd
*inotify_fd
;
124 struct change_record
{
127 struct filesystem_event event
;
132 struct object obj
; /* object header */
133 struct fd
*fd
; /* file descriptor to the directory */
134 mode_t mode
; /* file stat.st_mode */
135 uid_t uid
; /* file stat.st_uid */
136 struct list entry
; /* entry in global change notifications list */
137 unsigned int filter
; /* notification filter */
138 int notified
; /* SIGIO counter */
139 int want_data
; /* return change data */
140 int subtree
; /* do we want to watch subdirectories? */
141 struct list change_records
; /* data for the change */
142 struct list in_entry
; /* entry in the inode dirs list */
143 struct inode
*inode
; /* inode of the associated directory */
146 static struct fd
*dir_get_fd( struct object
*obj
);
147 static struct security_descriptor
*dir_get_sd( struct object
*obj
);
148 static int dir_set_sd( struct object
*obj
, const struct security_descriptor
*sd
,
149 unsigned int set_info
);
150 static void dir_dump( struct object
*obj
, int verbose
);
151 static void dir_destroy( struct object
*obj
);
153 static const struct object_ops dir_ops
=
155 sizeof(struct dir
), /* size */
157 no_get_type
, /* get_type */
158 add_queue
, /* add_queue */
159 remove_queue
, /* remove_queue */
160 default_fd_signaled
, /* signaled */
161 no_satisfied
, /* satisfied */
162 no_signal
, /* signal */
163 dir_get_fd
, /* get_fd */
164 default_fd_map_access
, /* map_access */
165 dir_get_sd
, /* get_sd */
166 dir_set_sd
, /* set_sd */
167 no_lookup_name
, /* lookup_name */
168 no_open_file
, /* open_file */
169 fd_close_handle
, /* close_handle */
170 dir_destroy
/* destroy */
173 static int dir_get_poll_events( struct fd
*fd
);
174 static enum server_fd_type
dir_get_fd_type( struct fd
*fd
);
176 static const struct fd_ops dir_fd_ops
=
178 dir_get_poll_events
, /* get_poll_events */
179 default_poll_event
, /* poll_event */
180 dir_get_fd_type
, /* get_fd_type */
181 no_fd_read
, /* read */
182 no_fd_write
, /* write */
183 no_fd_flush
, /* flush */
184 default_fd_ioctl
, /* ioctl */
185 default_fd_queue_async
, /* queue_async */
186 default_fd_reselect_async
, /* reselect_async */
187 default_fd_cancel_async
/* cancel_async */
190 static struct list change_list
= LIST_INIT(change_list
);
192 static void dnotify_adjust_changes( struct dir
*dir
)
194 #if defined(F_SETSIG) && defined(F_NOTIFY)
195 int fd
= get_unix_fd( dir
->fd
);
196 unsigned int filter
= dir
->filter
;
198 if ( 0 > fcntl( fd
, F_SETSIG
, SIGIO
) )
202 if (filter
& FILE_NOTIFY_CHANGE_FILE_NAME
)
203 val
|= DN_RENAME
| DN_DELETE
| DN_CREATE
;
204 if (filter
& FILE_NOTIFY_CHANGE_DIR_NAME
)
205 val
|= DN_RENAME
| DN_DELETE
| DN_CREATE
;
206 if (filter
& FILE_NOTIFY_CHANGE_ATTRIBUTES
)
208 if (filter
& FILE_NOTIFY_CHANGE_SIZE
)
210 if (filter
& FILE_NOTIFY_CHANGE_LAST_WRITE
)
212 if (filter
& FILE_NOTIFY_CHANGE_LAST_ACCESS
)
214 if (filter
& FILE_NOTIFY_CHANGE_CREATION
)
216 if (filter
& FILE_NOTIFY_CHANGE_SECURITY
)
218 fcntl( fd
, F_NOTIFY
, val
);
222 /* insert change in the global list */
223 static inline void insert_change( struct dir
*dir
)
227 sigemptyset( &sigset
);
228 sigaddset( &sigset
, SIGIO
);
229 sigprocmask( SIG_BLOCK
, &sigset
, NULL
);
230 list_add_head( &change_list
, &dir
->entry
);
231 sigprocmask( SIG_UNBLOCK
, &sigset
, NULL
);
234 /* remove change from the global list */
235 static inline void remove_change( struct dir
*dir
)
239 sigemptyset( &sigset
);
240 sigaddset( &sigset
, SIGIO
);
241 sigprocmask( SIG_BLOCK
, &sigset
, NULL
);
242 list_remove( &dir
->entry
);
243 sigprocmask( SIG_UNBLOCK
, &sigset
, NULL
);
246 static void dir_dump( struct object
*obj
, int verbose
)
248 struct dir
*dir
= (struct dir
*)obj
;
249 assert( obj
->ops
== &dir_ops
);
250 fprintf( stderr
, "Dirfile fd=%p filter=%08x\n", dir
->fd
, dir
->filter
);
253 /* enter here directly from SIGIO signal handler */
254 void do_change_notify( int unix_fd
)
258 /* FIXME: this is O(n) ... probably can be improved */
259 LIST_FOR_EACH_ENTRY( dir
, &change_list
, struct dir
, entry
)
261 if (get_unix_fd( dir
->fd
) != unix_fd
) continue;
262 interlocked_xchg_add( &dir
->notified
, 1 );
267 /* SIGIO callback, called synchronously with the poll loop */
268 void sigio_callback(void)
272 LIST_FOR_EACH_ENTRY( dir
, &change_list
, struct dir
, entry
)
274 if (interlocked_xchg( &dir
->notified
, 0 ))
275 fd_async_wake_up( dir
->fd
, ASYNC_TYPE_WAIT
, STATUS_NOTIFY_ENUM_DIR
);
279 static struct fd
*dir_get_fd( struct object
*obj
)
281 struct dir
*dir
= (struct dir
*)obj
;
282 assert( obj
->ops
== &dir_ops
);
283 return (struct fd
*)grab_object( dir
->fd
);
286 static int get_dir_unix_fd( struct dir
*dir
)
288 return get_unix_fd( dir
->fd
);
291 static struct security_descriptor
*dir_get_sd( struct object
*obj
)
293 struct dir
*dir
= (struct dir
*)obj
;
296 struct security_descriptor
*sd
;
297 assert( obj
->ops
== &dir_ops
);
299 unix_fd
= get_dir_unix_fd( dir
);
301 if (unix_fd
== -1 || fstat( unix_fd
, &st
) == -1)
304 /* mode and uid the same? if so, no need to re-generate security descriptor */
306 (st
.st_mode
& (S_IRWXU
|S_IRWXO
)) == (dir
->mode
& (S_IRWXU
|S_IRWXO
)) &&
307 (st
.st_uid
== dir
->uid
))
310 sd
= mode_to_sd( st
.st_mode
,
311 security_unix_uid_to_sid( st
.st_uid
),
312 token_get_primary_group( current
->process
->token
));
313 if (!sd
) return obj
->sd
;
315 dir
->mode
= st
.st_mode
;
316 dir
->uid
= st
.st_uid
;
322 static int dir_set_sd( struct object
*obj
, const struct security_descriptor
*sd
,
323 unsigned int set_info
)
325 struct dir
*dir
= (struct dir
*)obj
;
331 assert( obj
->ops
== &dir_ops
);
333 unix_fd
= get_dir_unix_fd( dir
);
335 if (unix_fd
== -1 || fstat( unix_fd
, &st
) == -1) return 1;
337 if (set_info
& OWNER_SECURITY_INFORMATION
)
339 owner
= sd_get_owner( sd
);
342 set_error( STATUS_INVALID_SECURITY_DESCR
);
345 if (!obj
->sd
|| !security_equal_sid( owner
, sd_get_owner( obj
->sd
) ))
347 /* FIXME: get Unix uid and call fchown */
351 owner
= sd_get_owner( obj
->sd
);
353 owner
= token_get_user( current
->process
->token
);
355 if (set_info
& DACL_SECURITY_INFORMATION
)
357 /* keep the bits that we don't map to access rights in the ACL */
358 mode
= st
.st_mode
& (S_ISUID
|S_ISGID
|S_ISVTX
);
359 mode
|= sd_to_mode( sd
, owner
);
361 if (((st
.st_mode
^ mode
) & (S_IRWXU
|S_IRWXG
|S_IRWXO
)) && fchmod( unix_fd
, mode
) == -1)
370 static struct change_record
*get_first_change_record( struct dir
*dir
)
372 struct list
*ptr
= list_head( &dir
->change_records
);
373 if (!ptr
) return NULL
;
375 return LIST_ENTRY( ptr
, struct change_record
, entry
);
378 static void dir_destroy( struct object
*obj
)
380 struct change_record
*record
;
381 struct dir
*dir
= (struct dir
*)obj
;
382 assert (obj
->ops
== &dir_ops
);
385 remove_change( dir
);
389 list_remove( &dir
->in_entry
);
390 free_inode( dir
->inode
);
393 while ((record
= get_first_change_record( dir
))) free( record
);
395 release_object( dir
->fd
);
397 if (inotify_fd
&& list_empty( &change_list
))
399 release_object( inotify_fd
);
404 struct dir
*get_dir_obj( struct process
*process
, obj_handle_t handle
, unsigned int access
)
406 return (struct dir
*)get_handle_obj( process
, handle
, access
, &dir_ops
);
409 static int dir_get_poll_events( struct fd
*fd
)
414 static enum server_fd_type
dir_get_fd_type( struct fd
*fd
)
424 struct list ch_entry
; /* entry in the children list */
425 struct list children
; /* children of this inode */
426 struct inode
*parent
; /* parent of this inode */
427 struct list dirs
; /* directory handles watching this inode */
428 struct list ino_entry
; /* entry in the inode hash */
429 struct list wd_entry
; /* entry in the watch descriptor hash */
430 dev_t dev
; /* device number */
431 ino_t ino
; /* device's inode number */
432 int wd
; /* inotify's watch descriptor */
433 char *name
; /* basename name of the inode */
436 static struct list inode_hash
[ HASH_SIZE
];
437 static struct list wd_hash
[ HASH_SIZE
];
439 static int inotify_add_dir( char *path
, unsigned int filter
);
441 static struct inode
*inode_from_wd( int wd
)
443 struct list
*bucket
= &wd_hash
[ wd
% HASH_SIZE
];
446 LIST_FOR_EACH_ENTRY( inode
, bucket
, struct inode
, wd_entry
)
453 static inline struct list
*get_hash_list( dev_t dev
, ino_t ino
)
455 return &inode_hash
[ (ino
^ dev
) % HASH_SIZE
];
458 static struct inode
*find_inode( dev_t dev
, ino_t ino
)
460 struct list
*bucket
= get_hash_list( dev
, ino
);
463 LIST_FOR_EACH_ENTRY( inode
, bucket
, struct inode
, ino_entry
)
464 if (inode
->ino
== ino
&& inode
->dev
== dev
)
470 static struct inode
*create_inode( dev_t dev
, ino_t ino
)
474 inode
= malloc( sizeof *inode
);
477 list_init( &inode
->children
);
478 list_init( &inode
->dirs
);
482 inode
->parent
= NULL
;
484 list_add_tail( get_hash_list( dev
, ino
), &inode
->ino_entry
);
489 static struct inode
*get_inode( dev_t dev
, ino_t ino
)
493 inode
= find_inode( dev
, ino
);
496 return create_inode( dev
, ino
);
499 static void inode_set_wd( struct inode
*inode
, int wd
)
502 list_remove( &inode
->wd_entry
);
504 list_add_tail( &wd_hash
[ wd
% HASH_SIZE
], &inode
->wd_entry
);
507 static void inode_set_name( struct inode
*inode
, const char *name
)
510 inode
->name
= name
? strdup( name
) : NULL
;
513 static void free_inode( struct inode
*inode
)
515 int subtree
= 0, watches
= 0;
516 struct inode
*tmp
, *next
;
519 LIST_FOR_EACH_ENTRY( dir
, &inode
->dirs
, struct dir
, in_entry
)
521 subtree
|= dir
->subtree
;
525 if (!subtree
&& !inode
->parent
)
527 LIST_FOR_EACH_ENTRY_SAFE( tmp
, next
, &inode
->children
,
528 struct inode
, ch_entry
)
530 assert( tmp
!= inode
);
531 assert( tmp
->parent
== inode
);
540 list_remove( &inode
->ch_entry
);
542 /* disconnect remaining children from the parent */
543 LIST_FOR_EACH_ENTRY_SAFE( tmp
, next
, &inode
->children
, struct inode
, ch_entry
)
545 list_remove( &tmp
->ch_entry
);
551 inotify_rm_watch( get_unix_fd( inotify_fd
), inode
->wd
);
552 list_remove( &inode
->wd_entry
);
554 list_remove( &inode
->ino_entry
);
560 static struct inode
*inode_add( struct inode
*parent
,
561 dev_t dev
, ino_t ino
, const char *name
)
565 inode
= get_inode( dev
, ino
);
571 list_add_tail( &parent
->children
, &inode
->ch_entry
);
572 inode
->parent
= parent
;
573 assert( inode
!= parent
);
575 inode_set_name( inode
, name
);
580 static struct inode
*inode_from_name( struct inode
*inode
, const char *name
)
584 LIST_FOR_EACH_ENTRY( i
, &inode
->children
, struct inode
, ch_entry
)
585 if (i
->name
&& !strcmp( i
->name
, name
))
590 static int inotify_get_poll_events( struct fd
*fd
);
591 static void inotify_poll_event( struct fd
*fd
, int event
);
593 static const struct fd_ops inotify_fd_ops
=
595 inotify_get_poll_events
, /* get_poll_events */
596 inotify_poll_event
, /* poll_event */
598 NULL
, /* get_fd_type */
600 NULL
, /* queue_async */
601 NULL
, /* reselect_async */
602 NULL
, /* cancel_async */
605 static int inotify_get_poll_events( struct fd
*fd
)
610 static void inotify_do_change_notify( struct dir
*dir
, unsigned int action
,
611 unsigned int cookie
, const char *relpath
)
613 struct change_record
*record
;
615 assert( dir
->obj
.ops
== &dir_ops
);
619 size_t len
= strlen(relpath
);
620 record
= malloc( offsetof(struct change_record
, event
.name
[len
]) );
624 record
->cookie
= cookie
;
625 record
->event
.action
= action
;
626 memcpy( record
->event
.name
, relpath
, len
);
627 record
->event
.len
= len
;
629 list_add_tail( &dir
->change_records
, &record
->entry
);
632 fd_async_wake_up( dir
->fd
, ASYNC_TYPE_WAIT
, STATUS_ALERTED
);
635 static unsigned int filter_from_event( struct inotify_event
*ie
)
637 unsigned int filter
= 0;
639 if (ie
->mask
& (IN_MOVED_FROM
| IN_MOVED_TO
| IN_DELETE
| IN_CREATE
))
640 filter
|= FILE_NOTIFY_CHANGE_FILE_NAME
| FILE_NOTIFY_CHANGE_DIR_NAME
;
641 if (ie
->mask
& IN_MODIFY
)
642 filter
|= FILE_NOTIFY_CHANGE_SIZE
| FILE_NOTIFY_CHANGE_LAST_WRITE
;
643 if (ie
->mask
& IN_ATTRIB
)
644 filter
|= FILE_NOTIFY_CHANGE_ATTRIBUTES
| FILE_NOTIFY_CHANGE_SECURITY
;
645 if (ie
->mask
& IN_ACCESS
)
646 filter
|= FILE_NOTIFY_CHANGE_LAST_ACCESS
;
647 if (ie
->mask
& IN_CREATE
)
648 filter
|= FILE_NOTIFY_CHANGE_CREATION
;
650 if (ie
->mask
& IN_ISDIR
)
651 filter
&= ~FILE_NOTIFY_CHANGE_FILE_NAME
;
653 filter
&= ~FILE_NOTIFY_CHANGE_DIR_NAME
;
658 /* scan up the parent directories for watches */
659 static unsigned int filter_from_inode( struct inode
*inode
, int is_parent
)
661 unsigned int filter
= 0;
664 /* combine filters from parents watching subtrees */
667 LIST_FOR_EACH_ENTRY( dir
, &inode
->dirs
, struct dir
, in_entry
)
668 if (dir
->subtree
|| !is_parent
)
669 filter
|= dir
->filter
;
671 inode
= inode
->parent
;
677 static char *inode_get_path( struct inode
*inode
, int sz
)
686 head
= list_head( &inode
->dirs
);
689 int unix_fd
= get_unix_fd( LIST_ENTRY( head
, struct dir
, in_entry
)->fd
);
690 path
= malloc ( 32 + sz
);
692 sprintf( path
, "/proc/self/fd/%u/", unix_fd
);
699 len
= strlen( inode
->name
);
700 path
= inode_get_path( inode
->parent
, sz
+ len
+ 1 );
704 strcat( path
, inode
->name
);
710 static void inode_check_dir( struct inode
*parent
, const char *name
)
718 path
= inode_get_path( parent
, strlen(name
) );
722 strcat( path
, name
);
724 if (stat( path
, &st
) < 0)
727 filter
= filter_from_inode( parent
, 1 );
731 inode
= inode_add( parent
, st
.st_dev
, st
.st_ino
, name
);
732 if (!inode
|| inode
->wd
!= -1)
735 wd
= inotify_add_dir( path
, filter
);
737 inode_set_wd( inode
, wd
);
745 static int prepend( char **path
, const char *segment
)
750 extra
= strlen( segment
) + 1;
753 int len
= strlen( *path
) + 1;
754 p
= realloc( *path
, len
+ extra
);
756 memmove( &p
[ extra
], p
, len
);
757 p
[ extra
- 1 ] = '/';
758 memcpy( p
, segment
, extra
- 1 );
764 memcpy( p
, segment
, extra
);
772 static void inotify_notify_all( struct inotify_event
*ie
)
774 unsigned int filter
, action
;
775 struct inode
*inode
, *i
;
779 inode
= inode_from_wd( ie
->wd
);
782 fprintf( stderr
, "no inode matches %d\n", ie
->wd
);
786 filter
= filter_from_event( ie
);
788 if (ie
->mask
& IN_CREATE
)
790 if (ie
->mask
& IN_ISDIR
)
791 inode_check_dir( inode
, ie
->name
);
793 action
= FILE_ACTION_ADDED
;
795 else if (ie
->mask
& IN_DELETE
)
796 action
= FILE_ACTION_REMOVED
;
797 else if (ie
->mask
& IN_MOVED_FROM
)
798 action
= FILE_ACTION_RENAMED_OLD_NAME
;
799 else if (ie
->mask
& IN_MOVED_TO
)
800 action
= FILE_ACTION_RENAMED_NEW_NAME
;
802 action
= FILE_ACTION_MODIFIED
;
805 * Work our way up the inode hierarchy
806 * extending the relative path as we go
807 * and notifying all recursive watches.
809 if (!prepend( &path
, ie
->name
))
812 for (i
= inode
; i
; i
= i
->parent
)
814 LIST_FOR_EACH_ENTRY( dir
, &i
->dirs
, struct dir
, in_entry
)
815 if ((filter
& dir
->filter
) && (i
==inode
|| dir
->subtree
))
816 inotify_do_change_notify( dir
, action
, ie
->cookie
, path
);
818 if (!i
->name
|| !prepend( &path
, i
->name
))
824 if (ie
->mask
& IN_DELETE
)
826 i
= inode_from_name( inode
, ie
->name
);
832 static void inotify_poll_event( struct fd
*fd
, int event
)
836 struct inotify_event
*ie
;
838 unix_fd
= get_unix_fd( fd
);
839 r
= read( unix_fd
, buffer
, sizeof buffer
);
842 fprintf(stderr
,"inotify_poll_event(): inotify read failed!\n");
846 for( ofs
= 0; ofs
< r
- offsetof(struct inotify_event
, name
); )
848 ie
= (struct inotify_event
*) &buffer
[ofs
];
851 ofs
+= offsetof( struct inotify_event
, name
[ie
->len
] );
853 inotify_notify_all( ie
);
857 static inline struct fd
*create_inotify_fd( void )
861 unix_fd
= inotify_init();
864 return create_anonymous_fd( &inotify_fd_ops
, unix_fd
, NULL
, 0 );
867 static int map_flags( unsigned int filter
)
871 /* always watch these so we can track subdirectories in recursive watches */
872 mask
= (IN_MOVED_FROM
| IN_MOVED_TO
| IN_DELETE
| IN_CREATE
| IN_DELETE_SELF
);
874 if (filter
& FILE_NOTIFY_CHANGE_ATTRIBUTES
)
876 if (filter
& FILE_NOTIFY_CHANGE_SIZE
)
878 if (filter
& FILE_NOTIFY_CHANGE_LAST_WRITE
)
880 if (filter
& FILE_NOTIFY_CHANGE_LAST_ACCESS
)
882 if (filter
& FILE_NOTIFY_CHANGE_SECURITY
)
888 static int inotify_add_dir( char *path
, unsigned int filter
)
890 int wd
= inotify_add_watch( get_unix_fd( inotify_fd
),
891 path
, map_flags( filter
) );
893 set_fd_events( inotify_fd
, POLLIN
);
897 static int init_inotify( void )
904 inotify_fd
= create_inotify_fd();
908 for (i
=0; i
<HASH_SIZE
; i
++)
910 list_init( &inode_hash
[i
] );
911 list_init( &wd_hash
[i
] );
917 static int inotify_adjust_changes( struct dir
*dir
)
928 unix_fd
= get_unix_fd( dir
->fd
);
933 /* check if this fd is already being watched */
934 if (-1 == fstat( unix_fd
, &st
))
937 inode
= get_inode( st
.st_dev
, st
.st_ino
);
939 inode
= create_inode( st
.st_dev
, st
.st_ino
);
942 list_add_tail( &inode
->dirs
, &dir
->in_entry
);
946 filter
= filter_from_inode( inode
, 0 );
948 sprintf( path
, "/proc/self/fd/%u", unix_fd
);
949 wd
= inotify_add_dir( path
, filter
);
950 if (wd
== -1) return 0;
952 inode_set_wd( inode
, wd
);
957 static char *get_basename( const char *link
)
959 char *buffer
, *name
= NULL
;
964 buffer
= malloc( n
);
965 if (!buffer
) return NULL
;
967 r
= readlink( link
, buffer
, n
);
982 while (r
> 0 && name
[ r
- 1 ] == '/' )
986 name
= strrchr( name
, '/' );
988 name
= strdup( &name
[1] );
995 static int dir_add_to_existing_notify( struct dir
*dir
)
997 struct inode
*inode
, *parent
;
998 unsigned int filter
= 0;
999 struct stat st
, st_new
;
1000 char link
[35], *name
;
1006 unix_fd
= get_unix_fd( dir
->fd
);
1008 /* check if it's in the list of inodes we want to watch */
1009 if (-1 == fstat( unix_fd
, &st_new
))
1011 inode
= find_inode( st_new
.st_dev
, st_new
.st_ino
);
1015 /* lookup the parent */
1016 sprintf( link
, "/proc/self/fd/%u/..", unix_fd
);
1017 if (-1 == stat( link
, &st
))
1021 * If there's no parent, stop. We could keep going adding
1022 * ../ to the path until we hit the root of the tree or
1023 * find a recursively watched ancestor.
1024 * Assume it's too expensive to search up the tree for now.
1026 parent
= find_inode( st
.st_dev
, st
.st_ino
);
1030 if (parent
->wd
== -1)
1033 filter
= filter_from_inode( parent
, 1 );
1037 sprintf( link
, "/proc/self/fd/%u", unix_fd
);
1038 name
= get_basename( link
);
1041 inode
= inode_add( parent
, st_new
.st_dev
, st_new
.st_ino
, name
);
1046 /* Couldn't find this inode at the start of the function, must be new */
1047 assert( inode
->wd
== -1 );
1049 wd
= inotify_add_dir( link
, filter
);
1051 inode_set_wd( inode
, wd
);
1058 static int init_inotify( void )
1063 static int inotify_adjust_changes( struct dir
*dir
)
1068 static void free_inode( struct inode
*inode
)
1073 static int dir_add_to_existing_notify( struct dir
*dir
)
1078 #endif /* USE_INOTIFY */
1080 struct object
*create_dir_obj( struct fd
*fd
, unsigned int access
, mode_t mode
)
1084 dir
= alloc_object( &dir_ops
);
1088 list_init( &dir
->change_records
);
1096 dir
->uid
= ~(uid_t
)0;
1097 set_fd_user( fd
, &dir_fd_ops
, &dir
->obj
);
1099 dir_add_to_existing_notify( dir
);
1104 /* enable change notifications for a directory */
1105 DECL_HANDLER(read_directory_changes
)
1108 struct async
*async
;
1112 set_error(STATUS_INVALID_PARAMETER
);
1116 dir
= get_dir_obj( current
->process
, req
->async
.handle
, 0 );
1120 /* requests don't timeout */
1121 if (!(async
= fd_queue_async( dir
->fd
, &req
->async
, ASYNC_TYPE_WAIT
))) goto end
;
1123 /* assign it once */
1127 insert_change( dir
);
1128 dir
->filter
= req
->filter
;
1129 dir
->subtree
= req
->subtree
;
1130 dir
->want_data
= req
->want_data
;
1133 /* if there's already a change in the queue, send it */
1134 if (!list_empty( &dir
->change_records
))
1135 fd_async_wake_up( dir
->fd
, ASYNC_TYPE_WAIT
, STATUS_ALERTED
);
1137 /* setup the real notification */
1138 if (!inotify_adjust_changes( dir
))
1139 dnotify_adjust_changes( dir
);
1141 release_object( async
);
1142 set_error(STATUS_PENDING
);
1145 release_object( dir
);
1148 DECL_HANDLER(read_change
)
1150 struct change_record
*record
, *next
;
1156 dir
= get_dir_obj( current
->process
, req
->handle
, 0 );
1160 list_init( &events
);
1161 list_move_tail( &events
, &dir
->change_records
);
1162 release_object( dir
);
1164 if (list_empty( &events
))
1166 set_error( STATUS_NO_DATA_DETECTED
);
1170 LIST_FOR_EACH_ENTRY( record
, &events
, struct change_record
, entry
)
1172 size
+= (offsetof(struct filesystem_event
, name
[record
->event
.len
])
1173 + sizeof(int)-1) / sizeof(int) * sizeof(int);
1176 if (size
> get_reply_max_size())
1177 set_error( STATUS_BUFFER_TOO_SMALL
);
1178 else if ((data
= mem_alloc( size
)) != NULL
)
1181 LIST_FOR_EACH_ENTRY( record
, &events
, struct change_record
, entry
)
1183 data_size_t len
= offsetof( struct filesystem_event
, name
[record
->event
.len
] );
1185 /* FIXME: rename events are sometimes reported as delete/create */
1186 if (record
->event
.action
== FILE_ACTION_RENAMED_OLD_NAME
)
1188 struct list
*elem
= list_next( &events
, &record
->entry
);
1190 next
= LIST_ENTRY(elem
, struct change_record
, entry
);
1192 if (elem
&& next
->cookie
== record
->cookie
)
1195 record
->event
.action
= FILE_ACTION_REMOVED
;
1197 else if (record
->event
.action
== FILE_ACTION_RENAMED_NEW_NAME
&& record
->cookie
)
1198 record
->event
.action
= FILE_ACTION_ADDED
;
1200 memcpy( event
, &record
->event
, len
);
1202 if (len
% sizeof(int))
1204 memset( event
, 0, sizeof(int) - len
% sizeof(int) );
1205 event
+= sizeof(int) - len
% sizeof(int);
1208 set_reply_data_ptr( data
, size
);
1211 LIST_FOR_EACH_ENTRY_SAFE( record
, next
, &events
, struct change_record
, entry
)
1213 list_remove( &record
->entry
);