Newer
Older
/*
* Server-side change notification management
*
* Copyright (C) 1998 Alexandre Julliard
* Copyright (C) 2006 Mike McCormack
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
#include "config.h"
#include "wine/port.h"
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/types.h>
#include <limits.h>
#include <dirent.h>
#include <errno.h>
#ifdef HAVE_SYS_ERRNO_H
#include <sys/errno.h>
#endif
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "file.h"
#include "request.h"
#include "process.h"
#include "security.h"
#ifdef linux
#ifndef F_NOTIFY
#define F_NOTIFY 1026
#define DN_ACCESS 0x00000001 /* File accessed */
#define DN_MODIFY 0x00000002 /* File modified */
#define DN_CREATE 0x00000004 /* File created */
#define DN_DELETE 0x00000008 /* File removed */
#define DN_RENAME 0x00000010 /* File renamed */
#define DN_ATTRIB 0x00000020 /* File changed attributes */
#define DN_MULTISHOT 0x80000000 /* Don't remove notifier */
#endif
#endif

Alexandre Julliard
committed
#ifdef HAVE_SYS_INOTIFY_H
#include <sys/inotify.h>
#define USE_INOTIFY
#elif defined(__linux__) && defined(__i386__)
#define SYS_inotify_init 291
#define SYS_inotify_add_watch 292
#define SYS_inotify_rm_watch 293
struct inotify_event {
int wd;
unsigned int mask;
unsigned int cookie;
unsigned int len;
char name[1];
};
#define IN_ACCESS 0x00000001
#define IN_MODIFY 0x00000002
#define IN_ATTRIB 0x00000004
#define IN_CLOSE_WRITE 0x00000008
#define IN_CLOSE_NOWRITE 0x00000010
#define IN_OPEN 0x00000020
#define IN_MOVED_FROM 0x00000040
#define IN_MOVED_TO 0x00000080
#define IN_CREATE 0x00000100
#define IN_DELETE 0x00000200
#define IN_DELETE_SELF 0x00000400
static inline int inotify_init( void )
{
return syscall( SYS_inotify_init );
}
static inline int inotify_add_watch( int fd, const char *name, unsigned int mask )
{
return syscall( SYS_inotify_add_watch, fd, name, mask );

Alexandre Julliard
committed
static inline int inotify_rm_watch( int fd, int wd )
return syscall( SYS_inotify_rm_watch, fd, wd );
struct inode;
static void free_inode( struct inode *inode );
static struct fd *inotify_fd;
struct change_record {
struct list entry;
int action;
int len;
char name[1];
};
struct dir
{
struct object obj; /* object header */
struct fd *fd; /* file descriptor to the directory */
mode_t mode; /* file stat.st_mode */
uid_t uid; /* file stat.st_uid */
struct list entry; /* entry in global change notifications list */
unsigned int filter; /* notification filter */
int notified; /* SIGIO counter */
int want_data; /* return change data */
Michael McCormack
committed
int subtree; /* do we want to watch subdirectories? */
struct list change_records; /* data for the change */
struct list in_entry; /* entry in the inode dirs list */
struct inode *inode; /* inode of the associated directory */
static struct fd *dir_get_fd( struct object *obj );
static struct security_descriptor *dir_get_sd( struct object *obj );
static int dir_set_sd( struct object *obj, const struct security_descriptor *sd,
unsigned int set_info );
static void dir_dump( struct object *obj, int verbose );
static void dir_destroy( struct object *obj );
static const struct object_ops dir_ops =
sizeof(struct dir), /* size */
dir_dump, /* dump */

Alexandre Julliard
committed
no_get_type, /* get_type */
add_queue, /* add_queue */
remove_queue, /* remove_queue */

Alexandre Julliard
committed
default_fd_signaled, /* signaled */
no_satisfied, /* satisfied */
dir_get_fd, /* get_fd */

Alexandre Julliard
committed
default_fd_map_access, /* map_access */
dir_get_sd, /* get_sd */
dir_set_sd, /* set_sd */
no_lookup_name, /* lookup_name */
no_open_file, /* open_file */

Alexandre Julliard
committed
fd_close_handle, /* close_handle */
dir_destroy /* destroy */
};
static int dir_get_poll_events( struct fd *fd );

Alexandre Julliard
committed
static enum server_fd_type dir_get_fd_type( struct fd *fd );
static const struct fd_ops dir_fd_ops =
{

Alexandre Julliard
committed
dir_get_poll_events, /* get_poll_events */
default_poll_event, /* poll_event */
no_flush, /* flush */

Alexandre Julliard
committed
dir_get_fd_type, /* get_fd_type */
default_fd_ioctl, /* ioctl */

Alexandre Julliard
committed
default_fd_queue_async, /* queue_async */
default_fd_reselect_async, /* reselect_async */
default_fd_cancel_async /* cancel_async */
static struct list change_list = LIST_INIT(change_list);
static void dnotify_adjust_changes( struct dir *dir )
#if defined(F_SETSIG) && defined(F_NOTIFY)
int fd = get_unix_fd( dir->fd );
unsigned int filter = dir->filter;
unsigned int val;
if ( 0 > fcntl( fd, F_SETSIG, SIGIO) )
return;
val = DN_MULTISHOT;
if (filter & FILE_NOTIFY_CHANGE_FILE_NAME)
val |= DN_RENAME | DN_DELETE | DN_CREATE;
if (filter & FILE_NOTIFY_CHANGE_DIR_NAME)
val |= DN_RENAME | DN_DELETE | DN_CREATE;
if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
val |= DN_ATTRIB;
if (filter & FILE_NOTIFY_CHANGE_SIZE)
val |= DN_MODIFY;
if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
val |= DN_MODIFY;
if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
if (filter & FILE_NOTIFY_CHANGE_CREATION)
if (filter & FILE_NOTIFY_CHANGE_SECURITY)
val |= DN_ATTRIB;
fcntl( fd, F_NOTIFY, val );
#endif
}
/* insert change in the global list */
static inline void insert_change( struct dir *dir )
{
sigset_t sigset;
sigemptyset( &sigset );
sigaddset( &sigset, SIGIO );
sigprocmask( SIG_BLOCK, &sigset, NULL );
list_add_head( &change_list, &dir->entry );
sigprocmask( SIG_UNBLOCK, &sigset, NULL );
}
/* remove change from the global list */
static inline void remove_change( struct dir *dir )
{
sigset_t sigset;
sigemptyset( &sigset );
sigaddset( &sigset, SIGIO );
sigprocmask( SIG_BLOCK, &sigset, NULL );
list_remove( &dir->entry );
sigprocmask( SIG_UNBLOCK, &sigset, NULL );
}
static void dir_dump( struct object *obj, int verbose )
struct dir *dir = (struct dir *)obj;
assert( obj->ops == &dir_ops );

Alexandre Julliard
committed
fprintf( stderr, "Dirfile fd=%p filter=%08x\n", dir->fd, dir->filter );
}
/* enter here directly from SIGIO signal handler */
void do_change_notify( int unix_fd )
{
/* FIXME: this is O(n) ... probably can be improved */
LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )
if (get_unix_fd( dir->fd ) != unix_fd) continue;
interlocked_xchg_add( &dir->notified, 1 );
break;
}
}
/* SIGIO callback, called synchronously with the poll loop */
void sigio_callback(void)
{
LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )

Alexandre Julliard
committed
if (interlocked_xchg( &dir->notified, 0 ))
fd_async_wake_up( dir->fd, ASYNC_TYPE_WAIT, STATUS_NOTIFY_ENUM_DIR );
static struct fd *dir_get_fd( struct object *obj )
struct dir *dir = (struct dir *)obj;
assert( obj->ops == &dir_ops );
return (struct fd *)grab_object( dir->fd );
}
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
static int get_dir_unix_fd( struct dir *dir )
{
return get_unix_fd( dir->fd );
}
static struct security_descriptor *dir_get_sd( struct object *obj )
{
struct dir *dir = (struct dir *)obj;
int unix_fd;
struct stat st;
struct security_descriptor *sd;
assert( obj->ops == &dir_ops );
unix_fd = get_dir_unix_fd( dir );
if (unix_fd == -1 || fstat( unix_fd, &st ) == -1)
return obj->sd;
/* mode and uid the same? if so, no need to re-generate security descriptor */
if (obj->sd &&
(st.st_mode & (S_IRWXU|S_IRWXO)) == (dir->mode & (S_IRWXU|S_IRWXO)) &&
(st.st_uid == dir->uid))
return obj->sd;
sd = mode_to_sd( st.st_mode,
security_unix_uid_to_sid( st.st_uid ),
token_get_primary_group( current->process->token ));
if (!sd) return obj->sd;
dir->mode = st.st_mode;
dir->uid = st.st_uid;
free( obj->sd );
obj->sd = sd;
return sd;
}
static int dir_set_sd( struct object *obj, const struct security_descriptor *sd,
unsigned int set_info )
{
struct dir *dir = (struct dir *)obj;
const SID *owner;

Alexandre Julliard
committed
struct stat st;
mode_t mode;
int unix_fd;
assert( obj->ops == &dir_ops );
unix_fd = get_dir_unix_fd( dir );

Alexandre Julliard
committed
if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 1;
if (set_info & OWNER_SECURITY_INFORMATION)
{
owner = sd_get_owner( sd );
if (!owner)
{
set_error( STATUS_INVALID_SECURITY_DESCR );
return 0;
}
if (!obj->sd || !security_equal_sid( owner, sd_get_owner( obj->sd ) ))
{
/* FIXME: get Unix uid and call fchown */
}
}
else if (obj->sd)
owner = sd_get_owner( obj->sd );
else
owner = token_get_user( current->process->token );
if (set_info & DACL_SECURITY_INFORMATION)
{
/* keep the bits that we don't map to access rights in the ACL */
mode = st.st_mode & (S_ISUID|S_ISGID|S_ISVTX);
mode |= sd_to_mode( sd, owner );
if (((st.st_mode ^ mode) & (S_IRWXU|S_IRWXG|S_IRWXO)) && fchmod( unix_fd, mode ) == -1)

Alexandre Julliard
committed
file_set_error();
return 0;
}
}
return 1;
}
static struct change_record *get_first_change_record( struct dir *dir )
{
struct list *ptr = list_head( &dir->change_records );
if (!ptr) return NULL;
list_remove( ptr );
return LIST_ENTRY( ptr, struct change_record, entry );
}
static void dir_destroy( struct object *obj )
{
struct change_record *record;
struct dir *dir = (struct dir *)obj;
assert (obj->ops == &dir_ops);
if (dir->filter)
remove_change( dir );
if (dir->inode)
{
list_remove( &dir->in_entry );
free_inode( dir->inode );
}
while ((record = get_first_change_record( dir ))) free( record );
release_object( dir->fd );
if (inotify_fd && list_empty( &change_list ))
{
release_object( inotify_fd );
inotify_fd = NULL;
}
}
struct dir *get_dir_obj( struct process *process, obj_handle_t handle, unsigned int access )
{
return (struct dir *)get_handle_obj( process, handle, access, &dir_ops );
}
static int dir_get_poll_events( struct fd *fd )
{
return 0;
}

Alexandre Julliard
committed
static enum server_fd_type dir_get_fd_type( struct fd *fd )
return FD_TYPE_DIR;
}
#define HASH_SIZE 31
struct inode {
Michael McCormack
committed
struct list ch_entry; /* entry in the children list */
struct list children; /* children of this inode */
struct inode *parent; /* parent of this inode */
struct list dirs; /* directory handles watching this inode */
struct list ino_entry; /* entry in the inode hash */
struct list wd_entry; /* entry in the watch descriptor hash */
dev_t dev; /* device number */
ino_t ino; /* device's inode number */
int wd; /* inotify's watch descriptor */
Michael McCormack
committed
char *name; /* basename name of the inode */
};
Robert Shearman
committed
static struct list inode_hash[ HASH_SIZE ];
static struct list wd_hash[ HASH_SIZE ];
Michael McCormack
committed
static int inotify_add_dir( char *path, unsigned int filter );
static struct inode *inode_from_wd( int wd )
{
struct list *bucket = &wd_hash[ wd % HASH_SIZE ];
struct inode *inode;
LIST_FOR_EACH_ENTRY( inode, bucket, struct inode, wd_entry )
if (inode->wd == wd)
return inode;
return NULL;
}
static inline struct list *get_hash_list( dev_t dev, ino_t ino )
{
return &inode_hash[ (ino ^ dev) % HASH_SIZE ];
}
Michael McCormack
committed
static struct inode *find_inode( dev_t dev, ino_t ino )
{
struct list *bucket = get_hash_list( dev, ino );
struct inode *inode;
LIST_FOR_EACH_ENTRY( inode, bucket, struct inode, ino_entry )
if (inode->ino == ino && inode->dev == dev)
return inode;
return NULL;
}
static struct inode *create_inode( dev_t dev, ino_t ino )
{
struct inode *inode;
inode = malloc( sizeof *inode );
if (inode)
{
Michael McCormack
committed
list_init( &inode->children );
list_init( &inode->dirs );
inode->ino = ino;
inode->dev = dev;
inode->wd = -1;
Michael McCormack
committed
inode->parent = NULL;
inode->name = NULL;
list_add_tail( get_hash_list( dev, ino ), &inode->ino_entry );
}
return inode;
}
Michael McCormack
committed
static struct inode *get_inode( dev_t dev, ino_t ino )
{
struct inode *inode;
inode = find_inode( dev, ino );
if (inode)
return inode;
return create_inode( dev, ino );
}
static void inode_set_wd( struct inode *inode, int wd )
{
if (inode->wd != -1)
list_remove( &inode->wd_entry );
inode->wd = wd;
list_add_tail( &wd_hash[ wd % HASH_SIZE ], &inode->wd_entry );
}
Michael McCormack
committed
static void inode_set_name( struct inode *inode, const char *name )
{
free (inode->name);
Michael McCormack
committed
inode->name = name ? strdup( name ) : NULL;
}
static void free_inode( struct inode *inode )
{
Michael McCormack
committed
int subtree = 0, watches = 0;
struct inode *tmp, *next;
Michael McCormack
committed
struct dir *dir;
LIST_FOR_EACH_ENTRY( dir, &inode->dirs, struct dir, in_entry )
{
subtree |= dir->subtree;
watches++;
}
if (!subtree && !inode->parent)
{
LIST_FOR_EACH_ENTRY_SAFE( tmp, next, &inode->children,
struct inode, ch_entry )
Michael McCormack
committed
{
assert( tmp != inode );
assert( tmp->parent == inode );
free_inode( tmp );
}
}
if (watches)
return;
Michael McCormack
committed
if (inode->parent)
list_remove( &inode->ch_entry );
/* disconnect remaining children from the parent */
LIST_FOR_EACH_ENTRY_SAFE( tmp, next, &inode->children, struct inode, ch_entry )
{
list_remove( &tmp->ch_entry );
tmp->parent = NULL;
}
if (inode->wd != -1)
{

Alexandre Julliard
committed
inotify_rm_watch( get_unix_fd( inotify_fd ), inode->wd );
list_remove( &inode->wd_entry );
}
list_remove( &inode->ino_entry );
Michael McCormack
committed
free( inode->name );
free( inode );
}
Michael McCormack
committed
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
static struct inode *inode_add( struct inode *parent,
dev_t dev, ino_t ino, const char *name )
{
struct inode *inode;
inode = get_inode( dev, ino );
if (!inode)
return NULL;
if (!inode->parent)
{
list_add_tail( &parent->children, &inode->ch_entry );
inode->parent = parent;
assert( inode != parent );
}
inode_set_name( inode, name );
return inode;
}
static struct inode *inode_from_name( struct inode *inode, const char *name )
{
struct inode *i;
LIST_FOR_EACH_ENTRY( i, &inode->children, struct inode, ch_entry )
if (i->name && !strcmp( i->name, name ))
return i;
return NULL;
}
static int inotify_get_poll_events( struct fd *fd );
static void inotify_poll_event( struct fd *fd, int event );
static const struct fd_ops inotify_fd_ops =
{

Alexandre Julliard
committed
inotify_get_poll_events, /* get_poll_events */
inotify_poll_event, /* poll_event */

Alexandre Julliard
committed
NULL, /* flush */
NULL, /* get_fd_type */
NULL, /* ioctl */

Alexandre Julliard
committed
NULL, /* queue_async */
NULL, /* reselect_async */
NULL, /* cancel_async */
};
static int inotify_get_poll_events( struct fd *fd )
{
return POLLIN;
}
static void inotify_do_change_notify( struct dir *dir, unsigned int action,
const char *relpath )
struct change_record *record;
Michael McCormack
committed
assert( dir->obj.ops == &dir_ops );
size_t len = strlen(relpath);
record = malloc( offsetof(struct change_record, name[len]) );
record->action = action;
memcpy( record->name, relpath, len );
record->len = len;
list_add_tail( &dir->change_records, &record->entry );
}
fd_async_wake_up( dir->fd, ASYNC_TYPE_WAIT, STATUS_ALERTED );
static unsigned int filter_from_event( struct inotify_event *ie )
{
unsigned int filter = 0;
if (ie->mask & (IN_MOVED_FROM | IN_MOVED_TO | IN_DELETE | IN_CREATE))
filter |= FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME;
if (ie->mask & IN_MODIFY)
filter |= FILE_NOTIFY_CHANGE_SIZE | FILE_NOTIFY_CHANGE_LAST_WRITE;
if (ie->mask & IN_ATTRIB)
filter |= FILE_NOTIFY_CHANGE_ATTRIBUTES | FILE_NOTIFY_CHANGE_SECURITY;
if (ie->mask & IN_ACCESS)
filter |= FILE_NOTIFY_CHANGE_LAST_ACCESS;
if (ie->mask & IN_CREATE)
filter |= FILE_NOTIFY_CHANGE_CREATION;
if (ie->mask & IN_ISDIR)
filter &= ~FILE_NOTIFY_CHANGE_FILE_NAME;
else
filter &= ~FILE_NOTIFY_CHANGE_DIR_NAME;
return filter;
}
Michael McCormack
committed
/* scan up the parent directories for watches */
static unsigned int filter_from_inode( struct inode *inode, int is_parent )
{
unsigned int filter = 0;
struct dir *dir;
/* combine filters from parents watching subtrees */
while (inode)
{
LIST_FOR_EACH_ENTRY( dir, &inode->dirs, struct dir, in_entry )
if (dir->subtree || !is_parent)
filter |= dir->filter;
is_parent = 1;
inode = inode->parent;
}
return filter;
}
static char *inode_get_path( struct inode *inode, int sz )
{
struct list *head;
Michael McCormack
committed
char *path;
int len;
if (!inode)
return NULL;
head = list_head( &inode->dirs );
Michael McCormack
committed
if (head)
{
int unix_fd = get_unix_fd( LIST_ENTRY( head, struct dir, in_entry )->fd );
path = malloc ( 32 + sz );
if (path)
sprintf( path, "/proc/self/fd/%u/", unix_fd );
return path;
}
if (!inode->name)
return NULL;
len = strlen( inode->name );
path = inode_get_path( inode->parent, sz + len + 1 );
if (!path)
return NULL;
strcat( path, inode->name );
strcat( path, "/" );
return path;
}
static void inode_check_dir( struct inode *parent, const char *name )
Michael McCormack
committed
{
char *path;
unsigned int filter;
struct inode *inode;
struct stat st;
Michael McCormack
committed
path = inode_get_path( parent, strlen(name) );
if (!path)
Michael McCormack
committed
strcat( path, name );
Michael McCormack
committed
goto end;
filter = filter_from_inode( parent, 1 );
if (!filter)
goto end;
inode = inode_add( parent, st.st_dev, st.st_ino, name );
if (!inode || inode->wd != -1)
goto end;
wd = inotify_add_dir( path, filter );
if (wd != -1)
inode_set_wd( inode, wd );
else
free_inode( inode );
end:
free( path );
Michael McCormack
committed
}
Michael McCormack
committed
static int prepend( char **path, const char *segment )
{
int extra;
char *p;
extra = strlen( segment ) + 1;
if (*path)
{
int len = strlen( *path ) + 1;
p = realloc( *path, len + extra );
if (!p) return 0;
memmove( &p[ extra ], p, len );
p[ extra - 1 ] = '/';
memcpy( p, segment, extra - 1 );
}
else
{
p = malloc( extra );
if (!p) return 0;
memcpy( p, segment, extra );
}
*path = p;
return 1;
}
static void inotify_notify_all( struct inotify_event *ie )
{
unsigned int filter, action;
Michael McCormack
committed
struct inode *inode, *i;
char *path = NULL;
struct dir *dir;
inode = inode_from_wd( ie->wd );
if (!inode)
{
fprintf( stderr, "no inode matches %d\n", ie->wd);
return;
}
filter = filter_from_event( ie );
if (ie->mask & IN_CREATE)
{
if (ie->mask & IN_ISDIR)
inode_check_dir( inode, ie->name );
action = FILE_ACTION_ADDED;
}
else if (ie->mask & IN_DELETE)
action = FILE_ACTION_REMOVED;
else if (ie->mask & IN_MOVED_FROM)
action = FILE_ACTION_RENAMED_OLD_NAME;
else if (ie->mask & IN_MOVED_TO)
action = FILE_ACTION_RENAMED_NEW_NAME;
else
action = FILE_ACTION_MODIFIED;
Michael McCormack
committed
/*
Michael McCormack
committed
* extending the relative path as we go
Michael McCormack
committed
*/
if (!prepend( &path, ie->name ))
return;
for (i = inode; i; i = i->parent)
{
LIST_FOR_EACH_ENTRY( dir, &i->dirs, struct dir, in_entry )
if ((filter & dir->filter) && (i==inode || dir->subtree))
inotify_do_change_notify( dir, action, path );
if (!i->name || !prepend( &path, i->name ))
break;
}
free( path );
if (ie->mask & IN_DELETE)
{
i = inode_from_name( inode, ie->name );
if (i)
free_inode( i );
}
}
static void inotify_poll_event( struct fd *fd, int event )
{
int r, ofs, unix_fd;
char buffer[0x1000];
struct inotify_event *ie;
unix_fd = get_unix_fd( fd );
r = read( unix_fd, buffer, sizeof buffer );
if (r < 0)
{
fprintf(stderr,"inotify_poll_event(): inotify read failed!\n");
return;
}
for( ofs = 0; ofs < r - offsetof(struct inotify_event, name); )
{
ie = (struct inotify_event*) &buffer[ofs];
if (!ie->len)
break;
ofs += offsetof( struct inotify_event, name[ie->len] );
if (ofs > r) break;
inotify_notify_all( ie );
static inline struct fd *create_inotify_fd( void )
{
int unix_fd;
unix_fd = inotify_init();
if (unix_fd<0)
return NULL;

Alexandre Julliard
committed
return create_anonymous_fd( &inotify_fd_ops, unix_fd, NULL, 0 );
static int map_flags( unsigned int filter )
Michael McCormack
committed
unsigned int mask;
/* always watch these so we can track subdirectories in recursive watches */
mask = (IN_MOVED_FROM | IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF);
if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
mask |= IN_ATTRIB;
if (filter & FILE_NOTIFY_CHANGE_SIZE)
mask |= IN_MODIFY;
if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
mask |= IN_MODIFY;
if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
mask |= IN_ACCESS;
if (filter & FILE_NOTIFY_CHANGE_SECURITY)
mask |= IN_ATTRIB;
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
return mask;
}
static int inotify_add_dir( char *path, unsigned int filter )
{
int wd = inotify_add_watch( get_unix_fd( inotify_fd ),
path, map_flags( filter ) );
if (wd != -1)
set_fd_events( inotify_fd, POLLIN );
return wd;
}
static int init_inotify( void )
{
int i;
if (inotify_fd)
return 1;
inotify_fd = create_inotify_fd();
if (!inotify_fd)
return 0;
for (i=0; i<HASH_SIZE; i++)
{
list_init( &inode_hash[i] );
list_init( &wd_hash[i] );
}
return 1;
}
static int inotify_adjust_changes( struct dir *dir )
{
unsigned int filter;
struct inode *inode;
struct stat st;
char path[32];
int wd, unix_fd;
if (!inotify_fd)
return 0;
unix_fd = get_unix_fd( dir->fd );
inode = dir->inode;
if (!inode)
{
/* check if this fd is already being watched */
if (-1 == fstat( unix_fd, &st ))
return 0;
inode = get_inode( st.st_dev, st.st_ino );
if (!inode)
inode = create_inode( st.st_dev, st.st_ino );
if (!inode)
return 0;
list_add_tail( &inode->dirs, &dir->in_entry );
dir->inode = inode;
}
Michael McCormack
committed
filter = filter_from_inode( inode, 0 );
sprintf( path, "/proc/self/fd/%u", unix_fd );
wd = inotify_add_dir( path, filter );
if (wd == -1) return 0;
inode_set_wd( inode, wd );
static char *get_basename( const char *link )
{
char *buffer, *name = NULL;
int r, n = 0x100;
while (1)
{
buffer = malloc( n );
if (!buffer) return NULL;
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
r = readlink( link, buffer, n );
if (r < 0)
break;
if (r < n)
{
name = buffer;
break;
}
free( buffer );
n *= 2;
}
if (name)
{
while (r > 0 && name[ r - 1 ] == '/' )
r--;
name[ r ] = 0;
name = strrchr( name, '/' );
if (name)
name = strdup( &name[1] );
}
free( buffer );
return name;
}
static int dir_add_to_existing_notify( struct dir *dir )
{
struct inode *inode, *parent;
unsigned int filter = 0;
struct stat st, st_new;
char link[35], *name;
int wd, unix_fd;