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
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 static inline int inotify_init( void )
100 __asm__ __volatile__( "int $0x80"
102 : "0" (SYS_inotify_init));
103 if (ret<0) { errno = -ret; ret = -1; }
107 static inline int inotify_add_watch( int fd, const char *name, unsigned int mask )
110 __asm__ __volatile__( "pushl %%ebx;\n\t"
114 : "=a" (ret) : "0" (SYS_inotify_add_watch),
115 "r" (fd), "c" (name), "d" (mask) );
116 if (ret<0) { errno = -ret; ret = -1; }
120 static inline int inotify_rm_watch( int fd, int wd )
123 __asm__ __volatile__( "pushl %%ebx;\n\t"
127 : "=a" (ret) : "0" (SYS_inotify_rm_watch),
128 "r" (fd), "c" (wd) );
129 if (ret<0) { errno = -ret; ret = -1; }
139 static void free_inode( struct inode *inode );
141 static struct fd *inotify_fd;
143 struct change_record {
152 struct object obj; /* object header */
153 struct fd *fd; /* file descriptor to the directory */
154 mode_t mode; /* file stat.st_mode */
155 uid_t uid; /* file stat.st_uid */
156 struct list entry; /* entry in global change notifications list */
157 unsigned int filter; /* notification filter */
158 int notified; /* SIGIO counter */
159 int want_data; /* return change data */
160 int subtree; /* do we want to watch subdirectories? */
161 struct list change_records; /* data for the change */
162 struct list in_entry; /* entry in the inode dirs list */
163 struct inode *inode; /* inode of the associated directory */
166 static struct fd *dir_get_fd( struct object *obj );
167 static struct security_descriptor *dir_get_sd( struct object *obj );
168 static int dir_set_sd( struct object *obj, const struct security_descriptor *sd,
169 unsigned int set_info );
170 static void dir_dump( struct object *obj, int verbose );
171 static void dir_destroy( struct object *obj );
173 static const struct object_ops dir_ops =
175 sizeof(struct dir), /* size */
177 no_get_type, /* get_type */
178 add_queue, /* add_queue */
179 remove_queue, /* remove_queue */
180 default_fd_signaled, /* signaled */
181 no_satisfied, /* satisfied */
182 no_signal, /* signal */
183 dir_get_fd, /* get_fd */
184 default_fd_map_access, /* map_access */
185 dir_get_sd, /* get_sd */
186 dir_set_sd, /* set_sd */
187 no_lookup_name, /* lookup_name */
188 no_open_file, /* open_file */
189 fd_close_handle, /* close_handle */
190 dir_destroy /* destroy */
193 static int dir_get_poll_events( struct fd *fd );
194 static enum server_fd_type dir_get_fd_type( struct fd *fd );
196 static const struct fd_ops dir_fd_ops =
198 dir_get_poll_events, /* get_poll_events */
199 default_poll_event, /* poll_event */
200 no_flush, /* flush */
201 dir_get_fd_type, /* get_fd_type */
202 default_fd_ioctl, /* ioctl */
203 default_fd_queue_async, /* queue_async */
204 default_fd_reselect_async, /* reselect_async */
205 default_fd_cancel_async /* cancel_async */
208 static struct list change_list = LIST_INIT(change_list);
210 static void dnotify_adjust_changes( struct dir *dir )
212 #if defined(F_SETSIG) && defined(F_NOTIFY)
213 int fd = get_unix_fd( dir->fd );
214 unsigned int filter = dir->filter;
216 if ( 0 > fcntl( fd, F_SETSIG, SIGIO) )
220 if (filter & FILE_NOTIFY_CHANGE_FILE_NAME)
221 val |= DN_RENAME | DN_DELETE | DN_CREATE;
222 if (filter & FILE_NOTIFY_CHANGE_DIR_NAME)
223 val |= DN_RENAME | DN_DELETE | DN_CREATE;
224 if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
226 if (filter & FILE_NOTIFY_CHANGE_SIZE)
228 if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
230 if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
232 if (filter & FILE_NOTIFY_CHANGE_CREATION)
234 if (filter & FILE_NOTIFY_CHANGE_SECURITY)
236 fcntl( fd, F_NOTIFY, val );
240 /* insert change in the global list */
241 static inline void insert_change( struct dir *dir )
245 sigemptyset( &sigset );
246 sigaddset( &sigset, SIGIO );
247 sigprocmask( SIG_BLOCK, &sigset, NULL );
248 list_add_head( &change_list, &dir->entry );
249 sigprocmask( SIG_UNBLOCK, &sigset, NULL );
252 /* remove change from the global list */
253 static inline void remove_change( struct dir *dir )
257 sigemptyset( &sigset );
258 sigaddset( &sigset, SIGIO );
259 sigprocmask( SIG_BLOCK, &sigset, NULL );
260 list_remove( &dir->entry );
261 sigprocmask( SIG_UNBLOCK, &sigset, NULL );
264 static void dir_dump( struct object *obj, int verbose )
266 struct dir *dir = (struct dir *)obj;
267 assert( obj->ops == &dir_ops );
268 fprintf( stderr, "Dirfile fd=%p filter=%08x\n", dir->fd, dir->filter );
271 /* enter here directly from SIGIO signal handler */
272 void do_change_notify( int unix_fd )
276 /* FIXME: this is O(n) ... probably can be improved */
277 LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )
279 if (get_unix_fd( dir->fd ) != unix_fd) continue;
280 interlocked_xchg_add( &dir->notified, 1 );
285 /* SIGIO callback, called synchronously with the poll loop */
286 void sigio_callback(void)
290 LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )
292 if (interlocked_xchg( &dir->notified, 0 ))
293 fd_async_wake_up( dir->fd, ASYNC_TYPE_WAIT, STATUS_NOTIFY_ENUM_DIR );
297 static struct fd *dir_get_fd( struct object *obj )
299 struct dir *dir = (struct dir *)obj;
300 assert( obj->ops == &dir_ops );
301 return (struct fd *)grab_object( dir->fd );
304 static int get_dir_unix_fd( struct dir *dir )
306 return get_unix_fd( dir->fd );
309 static struct security_descriptor *dir_get_sd( struct object *obj )
311 struct dir *dir = (struct dir *)obj;
314 struct security_descriptor *sd;
315 assert( obj->ops == &dir_ops );
317 unix_fd = get_dir_unix_fd( dir );
319 if (unix_fd == -1 || fstat( unix_fd, &st ) == -1)
322 /* mode and uid the same? if so, no need to re-generate security descriptor */
324 (st.st_mode & (S_IRWXU|S_IRWXO)) == (dir->mode & (S_IRWXU|S_IRWXO)) &&
325 (st.st_uid == dir->uid))
328 sd = mode_to_sd( st.st_mode,
329 security_unix_uid_to_sid( st.st_uid ),
330 token_get_primary_group( current->process->token ));
331 if (!sd) return obj->sd;
333 dir->mode = st.st_mode;
334 dir->uid = st.st_uid;
340 static int dir_set_sd( struct object *obj, const struct security_descriptor *sd,
341 unsigned int set_info )
343 struct dir *dir = (struct dir *)obj;
349 assert( obj->ops == &dir_ops );
351 unix_fd = get_dir_unix_fd( dir );
353 if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 1;
355 if (set_info & OWNER_SECURITY_INFORMATION)
357 owner = sd_get_owner( sd );
360 set_error( STATUS_INVALID_SECURITY_DESCR );
363 if (!obj->sd || !security_equal_sid( owner, sd_get_owner( obj->sd ) ))
365 /* FIXME: get Unix uid and call fchown */
369 owner = sd_get_owner( obj->sd );
371 owner = token_get_user( current->process->token );
373 if (set_info & DACL_SECURITY_INFORMATION)
375 /* keep the bits that we don't map to access rights in the ACL */
376 mode = st.st_mode & (S_ISUID|S_ISGID|S_ISVTX|S_IRWXG);
377 mode |= sd_to_mode( sd, owner );
379 if (st.st_mode != mode && fchmod( unix_fd, mode ) == -1)
388 static struct change_record *get_first_change_record( struct dir *dir )
390 struct list *ptr = list_head( &dir->change_records );
391 if (!ptr) return NULL;
393 return LIST_ENTRY( ptr, struct change_record, entry );
396 static void dir_destroy( struct object *obj )
398 struct change_record *record;
399 struct dir *dir = (struct dir *)obj;
400 assert (obj->ops == &dir_ops);
403 remove_change( dir );
407 list_remove( &dir->in_entry );
408 free_inode( dir->inode );
411 while ((record = get_first_change_record( dir ))) free( record );
413 release_object( dir->fd );
415 if (inotify_fd && list_empty( &change_list ))
417 release_object( inotify_fd );
423 get_dir_obj( struct process *process, obj_handle_t handle, unsigned int access )
425 return (struct dir *)get_handle_obj( process, handle, access, &dir_ops );
428 static int dir_get_poll_events( struct fd *fd )
433 static enum server_fd_type dir_get_fd_type( struct fd *fd )
443 struct list ch_entry; /* entry in the children list */
444 struct list children; /* children of this inode */
445 struct inode *parent; /* parent of this inode */
446 struct list dirs; /* directory handles watching this inode */
447 struct list ino_entry; /* entry in the inode hash */
448 struct list wd_entry; /* entry in the watch descriptor hash */
449 dev_t dev; /* device number */
450 ino_t ino; /* device's inode number */
451 int wd; /* inotify's watch descriptor */
452 char *name; /* basename name of the inode */
455 struct list inode_hash[ HASH_SIZE ];
456 struct list wd_hash[ HASH_SIZE ];
458 static int inotify_add_dir( char *path, unsigned int filter );
460 static struct inode *inode_from_wd( int wd )
462 struct list *bucket = &wd_hash[ wd % HASH_SIZE ];
465 LIST_FOR_EACH_ENTRY( inode, bucket, struct inode, wd_entry )
472 static inline struct list *get_hash_list( dev_t dev, ino_t ino )
474 return &inode_hash[ (ino ^ dev) % HASH_SIZE ];
477 static struct inode *find_inode( dev_t dev, ino_t ino )
479 struct list *bucket = get_hash_list( dev, ino );
482 LIST_FOR_EACH_ENTRY( inode, bucket, struct inode, ino_entry )
483 if (inode->ino == ino && inode->dev == dev)
489 static struct inode *create_inode( dev_t dev, ino_t ino )
493 inode = malloc( sizeof *inode );
496 list_init( &inode->children );
497 list_init( &inode->dirs );
501 inode->parent = NULL;
503 list_add_tail( get_hash_list( dev, ino ), &inode->ino_entry );
508 static struct inode *get_inode( dev_t dev, ino_t ino )
512 inode = find_inode( dev, ino );
515 return create_inode( dev, ino );
518 static void inode_set_wd( struct inode *inode, int wd )
521 list_remove( &inode->wd_entry );
523 list_add_tail( &wd_hash[ wd % HASH_SIZE ], &inode->wd_entry );
526 static void inode_set_name( struct inode *inode, const char *name )
529 inode->name = name ? strdup( name ) : NULL;
532 static void free_inode( struct inode *inode )
534 int subtree = 0, watches = 0;
535 struct inode *tmp, *next;
538 LIST_FOR_EACH_ENTRY( dir, &inode->dirs, struct dir, in_entry )
540 subtree |= dir->subtree;
544 if (!subtree && !inode->parent)
546 LIST_FOR_EACH_ENTRY_SAFE( tmp, next, &inode->children,
547 struct inode, ch_entry )
549 assert( tmp != inode );
550 assert( tmp->parent == inode );
559 list_remove( &inode->ch_entry );
561 /* disconnect remaining children from the parent */
562 LIST_FOR_EACH_ENTRY_SAFE( tmp, next, &inode->children, struct inode, ch_entry )
564 list_remove( &tmp->ch_entry );
570 inotify_rm_watch( get_unix_fd( inotify_fd ), inode->wd );
571 list_remove( &inode->wd_entry );
573 list_remove( &inode->ino_entry );
579 static struct inode *inode_add( struct inode *parent,
580 dev_t dev, ino_t ino, const char *name )
584 inode = get_inode( dev, ino );
590 list_add_tail( &parent->children, &inode->ch_entry );
591 inode->parent = parent;
592 assert( inode != parent );
594 inode_set_name( inode, name );
599 static struct inode *inode_from_name( struct inode *inode, const char *name )
603 LIST_FOR_EACH_ENTRY( i, &inode->children, struct inode, ch_entry )
604 if (i->name && !strcmp( i->name, name ))
609 static int inotify_get_poll_events( struct fd *fd );
610 static void inotify_poll_event( struct fd *fd, int event );
612 static const struct fd_ops inotify_fd_ops =
614 inotify_get_poll_events, /* get_poll_events */
615 inotify_poll_event, /* poll_event */
617 NULL, /* get_fd_type */
619 NULL, /* queue_async */
620 NULL, /* reselect_async */
621 NULL, /* cancel_async */
624 static int inotify_get_poll_events( struct fd *fd )
629 static void inotify_do_change_notify( struct dir *dir, unsigned int action,
630 const char *relpath )
632 struct change_record *record;
634 assert( dir->obj.ops == &dir_ops );
638 size_t len = strlen(relpath);
639 record = malloc( offsetof(struct change_record, name[len]) );
643 record->action = action;
644 memcpy( record->name, relpath, len );
647 list_add_tail( &dir->change_records, &record->entry );
650 fd_async_wake_up( dir->fd, ASYNC_TYPE_WAIT, STATUS_ALERTED );
653 static unsigned int filter_from_event( struct inotify_event *ie )
655 unsigned int filter = 0;
657 if (ie->mask & (IN_MOVED_FROM | IN_MOVED_TO | IN_DELETE | IN_CREATE))
658 filter |= FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME;
659 if (ie->mask & IN_MODIFY)
660 filter |= FILE_NOTIFY_CHANGE_SIZE | FILE_NOTIFY_CHANGE_LAST_WRITE;
661 if (ie->mask & IN_ATTRIB)
662 filter |= FILE_NOTIFY_CHANGE_ATTRIBUTES | FILE_NOTIFY_CHANGE_SECURITY;
663 if (ie->mask & IN_ACCESS)
664 filter |= FILE_NOTIFY_CHANGE_LAST_ACCESS;
665 if (ie->mask & IN_CREATE)
666 filter |= FILE_NOTIFY_CHANGE_CREATION;
671 /* scan up the parent directories for watches */
672 static unsigned int filter_from_inode( struct inode *inode, int is_parent )
674 unsigned int filter = 0;
677 /* combine filters from parents watching subtrees */
680 LIST_FOR_EACH_ENTRY( dir, &inode->dirs, struct dir, in_entry )
681 if (dir->subtree || !is_parent)
682 filter |= dir->filter;
684 inode = inode->parent;
690 static char *inode_get_path( struct inode *inode, int sz )
699 head = list_head( &inode->dirs );
702 int unix_fd = get_unix_fd( LIST_ENTRY( head, struct dir, in_entry )->fd );
703 path = malloc ( 32 + sz );
705 sprintf( path, "/proc/self/fd/%u/", unix_fd );
712 len = strlen( inode->name );
713 path = inode_get_path( inode->parent, sz + len + 1 );
717 strcat( path, inode->name );
723 static int inode_check_dir( struct inode *parent, const char *name )
731 path = inode_get_path( parent, strlen(name) );
735 strcat( path, name );
737 r = stat( path, &st );
740 if (!S_ISDIR(st.st_mode))
748 filter = filter_from_inode( parent, 1 );
752 inode = inode_add( parent, st.st_dev, st.st_ino, name );
753 if (!inode || inode->wd != -1)
756 wd = inotify_add_dir( path, filter );
758 inode_set_wd( inode, wd );
767 static int prepend( char **path, const char *segment )
772 extra = strlen( segment ) + 1;
775 int len = strlen( *path ) + 1;
776 p = realloc( *path, len + extra );
778 memmove( &p[ extra ], p, len );
779 p[ extra - 1 ] = '/';
780 memcpy( p, segment, extra - 1 );
786 memcpy( p, segment, extra );
794 static void inotify_notify_all( struct inotify_event *ie )
796 unsigned int filter, action;
797 struct inode *inode, *i;
801 inode = inode_from_wd( ie->wd );
804 fprintf( stderr, "no inode matches %d\n", ie->wd);
808 filter = filter_from_event( ie );
810 if (ie->mask & IN_CREATE)
812 switch (inode_check_dir( inode, ie->name ))
815 filter &= ~FILE_NOTIFY_CHANGE_FILE_NAME;
818 filter &= ~FILE_NOTIFY_CHANGE_DIR_NAME;
822 /* Maybe the file disappeared before we could check it? */
824 action = FILE_ACTION_ADDED;
826 else if (ie->mask & IN_DELETE)
827 action = FILE_ACTION_REMOVED;
829 action = FILE_ACTION_MODIFIED;
832 * Work our way up the inode hierarchy
833 * extending the relative path as we go
834 * and notifying all recursive watches.
836 if (!prepend( &path, ie->name ))
839 for (i = inode; i; i = i->parent)
841 LIST_FOR_EACH_ENTRY( dir, &i->dirs, struct dir, in_entry )
842 if ((filter & dir->filter) && (i==inode || dir->subtree))
843 inotify_do_change_notify( dir, action, path );
845 if (!i->name || !prepend( &path, i->name ))
851 if (ie->mask & IN_DELETE)
853 i = inode_from_name( inode, ie->name );
859 static void inotify_poll_event( struct fd *fd, int event )
863 struct inotify_event *ie;
865 unix_fd = get_unix_fd( fd );
866 r = read( unix_fd, buffer, sizeof buffer );
869 fprintf(stderr,"inotify_poll_event(): inotify read failed!\n");
873 for( ofs = 0; ofs < r - offsetof(struct inotify_event, name); )
875 ie = (struct inotify_event*) &buffer[ofs];
878 ofs += offsetof( struct inotify_event, name[ie->len] );
880 inotify_notify_all( ie );
884 static inline struct fd *create_inotify_fd( void )
888 unix_fd = inotify_init();
891 return create_anonymous_fd( &inotify_fd_ops, unix_fd, NULL, 0 );
894 static int map_flags( unsigned int filter )
898 /* always watch these so we can track subdirectories in recursive watches */
899 mask = (IN_MOVED_FROM | IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF);
901 if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
903 if (filter & FILE_NOTIFY_CHANGE_SIZE)
905 if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
907 if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
909 if (filter & FILE_NOTIFY_CHANGE_SECURITY)
915 static int inotify_add_dir( char *path, unsigned int filter )
917 int wd = inotify_add_watch( get_unix_fd( inotify_fd ),
918 path, map_flags( filter ) );
920 set_fd_events( inotify_fd, POLLIN );
924 static int init_inotify( void )
931 inotify_fd = create_inotify_fd();
935 for (i=0; i<HASH_SIZE; i++)
937 list_init( &inode_hash[i] );
938 list_init( &wd_hash[i] );
944 static int inotify_adjust_changes( struct dir *dir )
955 unix_fd = get_unix_fd( dir->fd );
960 /* check if this fd is already being watched */
961 if (-1 == fstat( unix_fd, &st ))
964 inode = get_inode( st.st_dev, st.st_ino );
966 inode = create_inode( st.st_dev, st.st_ino );
969 list_add_tail( &inode->dirs, &dir->in_entry );
973 filter = filter_from_inode( inode, 0 );
975 sprintf( path, "/proc/self/fd/%u", unix_fd );
976 wd = inotify_add_dir( path, filter );
977 if (wd == -1) return 0;
979 inode_set_wd( inode, wd );
984 static char *get_basename( const char *link )
986 char *buffer, *name = NULL;
991 buffer = malloc( n );
992 if (!buffer) return NULL;
994 r = readlink( link, buffer, n );
1009 while (r > 0 && name[ r - 1 ] == '/' )
1013 name = strrchr( name, '/' );
1015 name = strdup( &name[1] );
1022 static int dir_add_to_existing_notify( struct dir *dir )
1024 struct inode *inode, *parent;
1025 unsigned int filter = 0;
1026 struct stat st, st_new;
1027 char link[35], *name;
1033 unix_fd = get_unix_fd( dir->fd );
1035 /* check if it's in the list of inodes we want to watch */
1036 if (-1 == fstat( unix_fd, &st_new ))
1038 inode = find_inode( st_new.st_dev, st_new.st_ino );
1042 /* lookup the parent */
1043 sprintf( link, "/proc/self/fd/%u/..", unix_fd );
1044 if (-1 == stat( link, &st ))
1048 * If there's no parent, stop. We could keep going adding
1049 * ../ to the path until we hit the root of the tree or
1050 * find a recursively watched ancestor.
1051 * Assume it's too expensive to search up the tree for now.
1053 parent = find_inode( st.st_dev, st.st_ino );
1057 if (parent->wd == -1)
1060 filter = filter_from_inode( parent, 1 );
1064 sprintf( link, "/proc/self/fd/%u", unix_fd );
1065 name = get_basename( link );
1068 inode = inode_add( parent, st_new.st_dev, st_new.st_ino, name );
1073 /* Couldn't find this inode at the start of the function, must be new */
1074 assert( inode->wd == -1 );
1076 wd = inotify_add_dir( link, filter );
1078 inode_set_wd( inode, wd );
1085 static int init_inotify( void )
1090 static int inotify_adjust_changes( struct dir *dir )
1095 static void free_inode( struct inode *inode )
1100 static int dir_add_to_existing_notify( struct dir *dir )
1105 #endif /* USE_INOTIFY */
1107 struct object *create_dir_obj( struct fd *fd, unsigned int access, mode_t mode )
1111 dir = alloc_object( &dir_ops );
1115 list_init( &dir->change_records );
1123 dir->uid = ~(uid_t)0;
1124 set_fd_user( fd, &dir_fd_ops, &dir->obj );
1126 dir_add_to_existing_notify( dir );
1131 /* enable change notifications for a directory */
1132 DECL_HANDLER(read_directory_changes)
1135 struct async *async;
1139 set_error(STATUS_INVALID_PARAMETER);
1143 dir = get_dir_obj( current->process, req->async.handle, 0 );
1147 /* requests don't timeout */
1148 if (!(async = fd_queue_async( dir->fd, &req->async, ASYNC_TYPE_WAIT ))) goto end;
1150 /* assign it once */
1154 insert_change( dir );
1155 dir->filter = req->filter;
1156 dir->subtree = req->subtree;
1157 dir->want_data = req->want_data;
1160 /* if there's already a change in the queue, send it */
1161 if (!list_empty( &dir->change_records ))
1162 fd_async_wake_up( dir->fd, ASYNC_TYPE_WAIT, STATUS_ALERTED );
1164 /* setup the real notification */
1165 if (!inotify_adjust_changes( dir ))
1166 dnotify_adjust_changes( dir );
1168 release_object( async );
1169 set_error(STATUS_PENDING);
1172 release_object( dir );
1175 DECL_HANDLER(read_change)
1177 struct change_record *record;
1180 dir = get_dir_obj( current->process, req->handle, 0 );
1184 if ((record = get_first_change_record( dir )) != NULL)
1186 reply->action = record->action;
1187 set_reply_data( record->name, record->len );
1191 set_error( STATUS_NO_DATA_DETECTED );
1193 release_object( dir );