Sweden-Number/server/change.c

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/*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/stat.h>
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#include <errno.h>
#ifdef HAVE_SYS_ERRNO_H
#include <sys/errno.h>
#endif
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#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "file.h"
#include "handle.h"
#include "thread.h"
#include "request.h"
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#include "winternl.h"
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/* dnotify support */
#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 attibutes */
#define DN_MULTISHOT 0x80000000 /* Don't remove notifier */
#endif
#endif
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/* inotify support */
#if 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 )
{
int ret;
__asm__ __volatile__( "int $0x80"
: "=a" (ret)
: "0" (SYS_inotify_init));
if (ret<0) { errno = -ret; ret = -1; }
return ret;
}
static inline int inotify_add_watch( int fd, const char *name, unsigned int mask )
{
int ret;
__asm__ __volatile__( "pushl %%ebx;\n\t"
"movl %2,%%ebx;\n\t"
"int $0x80;\n\t"
"popl %%ebx"
: "=a" (ret) : "0" (SYS_inotify_add_watch),
"r" (fd), "c" (name), "d" (mask) );
if (ret<0) { errno = -ret; ret = -1; }
return ret;
}
static inline int inotify_remove_watch( int fd, int wd )
{
int ret;
__asm__ __volatile__( "pushl %%ebx;\n\t"
"movl %2,%%ebx;\n\t"
"int $0x80;\n\t"
"popl %%ebx"
: "=a" (ret) : "0" (SYS_inotify_rm_watch),
"r" (fd), "c" (wd) );
if (ret<0) { errno = -ret; ret = -1; }
return ret;
}
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#define USE_INOTIFY
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#endif
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 */
struct list entry; /* entry in global change notifications list */
struct event *event;
unsigned int filter; /* notification filter */
int notified; /* SIGIO counter */
int want_data; /* return change data */
long signaled; /* the file changed */
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struct fd *inotify_fd; /* inotify file descriptor */
int wd; /* inotify watch descriptor */
struct list change_q; /* change readers */
struct list change_records; /* data for the change */
};
static struct fd *dir_get_fd( struct object *obj );
static unsigned int dir_map_access( struct object *obj, unsigned int access );
static void dir_dump( struct object *obj, int verbose );
static void dir_destroy( struct object *obj );
static int dir_signaled( struct object *obj, struct thread *thread );
static const struct object_ops dir_ops =
{
sizeof(struct dir), /* size */
dir_dump, /* dump */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
dir_signaled, /* signaled */
no_satisfied, /* satisfied */
no_signal, /* signal */
dir_get_fd, /* get_fd */
dir_map_access, /* map_access */
no_lookup_name, /* lookup_name */
no_close_handle, /* close_handle */
dir_destroy /* destroy */
};
static int dir_get_poll_events( struct fd *fd );
static int dir_get_info( struct fd *fd );
static void dir_cancel_async( struct fd *fd );
static const struct fd_ops dir_fd_ops =
{
dir_get_poll_events, /* get_poll_events */
default_poll_event, /* poll_event */
no_flush, /* flush */
dir_get_info, /* get_file_info */
default_fd_queue_async, /* queue_async */
dir_cancel_async /* cancel_async */
};
static struct list change_list = LIST_INIT(change_list);
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static void dnotify_adjust_changes( struct dir *dir )
{
#if defined(F_SETSIG) && defined(F_NOTIFY)
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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)
val |= DN_ACCESS;
if (filter & FILE_NOTIFY_CHANGE_CREATION)
val |= DN_CREATE;
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 );
}
struct object *create_dir_obj( struct fd *fd )
{
struct dir *dir;
dir = alloc_object( &dir_ops );
if (!dir)
return NULL;
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list_init( &dir->change_q );
list_init( &dir->change_records );
dir->event = NULL;
dir->filter = 0;
dir->notified = 0;
dir->signaled = 0;
dir->want_data = 0;
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dir->inotify_fd = NULL;
dir->wd = -1;
grab_object( fd );
dir->fd = fd;
set_fd_user( fd, &dir_fd_ops, &dir->obj );
return &dir->obj;
}
static void dir_dump( struct object *obj, int verbose )
{
struct dir *dir = (struct dir *)obj;
assert( obj->ops == &dir_ops );
fprintf( stderr, "Dirfile fd=%p event=%p filter=%08x\n",
dir->fd, dir->event, dir->filter );
}
static int dir_signaled( struct object *obj, struct thread *thread )
{
struct dir *dir = (struct dir *)obj;
assert (obj->ops == &dir_ops);
return (dir->event == NULL) && dir->signaled;
}
/* enter here directly from SIGIO signal handler */
void do_change_notify( int unix_fd )
{
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struct dir *dir;
/* FIXME: this is O(n) ... probably can be improved */
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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;
}
}
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static void dir_signal_changed( struct dir *dir )
{
if (dir->event)
set_event( dir->event );
else
wake_up( &dir->obj, 0 );
}
/* SIGIO callback, called synchronously with the poll loop */
void sigio_callback(void)
{
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struct dir *dir;
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LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )
{
long count = interlocked_xchg( &dir->notified, 0 );
if (count)
{
dir->signaled += count;
if (dir->signaled == count) /* was it 0? */
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dir_signal_changed( 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 );
}
static unsigned int dir_map_access( struct object *obj, unsigned int access )
{
if (access & GENERIC_READ) access |= FILE_GENERIC_READ;
if (access & GENERIC_WRITE) access |= FILE_GENERIC_WRITE;
if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
if (access & GENERIC_ALL) access |= FILE_ALL_ACCESS;
return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
}
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 );
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if (dir->inotify_fd)
release_object( dir->inotify_fd );
async_terminate_queue( &dir->change_q, STATUS_CANCELLED );
while ((record = get_first_change_record( dir ))) free( record );
if (dir->event)
{
set_event( dir->event );
release_object( dir->event );
}
release_object( dir->fd );
}
static 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;
}
static int dir_get_info( struct fd *fd )
{
return 0;
}
static void dir_cancel_async( struct fd *fd )
{
struct dir *dir = (struct dir *) get_fd_user( fd );
async_terminate_queue( &dir->change_q, STATUS_CANCELLED );
}
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#ifdef USE_INOTIFY
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static int inotify_get_poll_events( struct fd *fd );
static void inotify_poll_event( struct fd *fd, int event );
static int inotify_get_info( struct fd *fd );
static const struct fd_ops inotify_fd_ops =
{
inotify_get_poll_events, /* get_poll_events */
inotify_poll_event, /* poll_event */
no_flush, /* flush */
inotify_get_info, /* get_file_info */
default_fd_queue_async, /* queue_async */
default_fd_cancel_async, /* cancel_async */
};
static int inotify_get_poll_events( struct fd *fd )
{
return POLLIN;
}
static void inotify_do_change_notify( struct dir *dir, struct inotify_event *ie )
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{
struct change_record *record;
if (dir->want_data)
{
size_t len = strlen(ie->name);
record = malloc( offsetof(struct change_record, name[len]) );
if (!record)
return;
if( ie->mask & IN_CREATE )
record->action = FILE_ACTION_ADDED;
else if( ie->mask & IN_DELETE )
record->action = FILE_ACTION_REMOVED;
else
record->action = FILE_ACTION_MODIFIED;
memcpy( record->name, ie->name, len );
record->len = len;
list_add_tail( &dir->change_records, &record->entry );
}
if (!list_empty( &dir->change_q ))
async_terminate_head( &dir->change_q, STATUS_ALERTED );
else
{
dir->signaled++;
dir_signal_changed( dir );
}
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}
static void inotify_poll_event( struct fd *fd, int event )
{
int r, ofs, unix_fd;
char buffer[0x1000];
struct inotify_event *ie;
struct dir *dir = get_fd_user( fd );
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); )
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{
ie = (struct inotify_event*) &buffer[ofs];
if (!ie->len)
break;
ofs += offsetof( struct inotify_event, name[ie->len] );
if (ofs > r) break;
inotify_do_change_notify( dir, ie );
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}
}
static int inotify_get_info( struct fd *fd )
{
return 0;
}
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static inline struct fd *create_inotify_fd( struct dir *dir )
{
int unix_fd;
unix_fd = inotify_init();
if (unix_fd<0)
return NULL;
return create_anonymous_fd( &inotify_fd_ops, unix_fd, &dir->obj );
}
static int inotify_adjust_changes( struct dir *dir )
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{
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unsigned int filter = dir->filter;
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unsigned int mask = 0;
char link[32];
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if (!dir->inotify_fd)
{
if (!(dir->inotify_fd = create_inotify_fd( dir ))) return 0;
}
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if (filter & FILE_NOTIFY_CHANGE_FILE_NAME)
mask |= (IN_MOVED_FROM | IN_MOVED_TO | IN_DELETE | IN_CREATE);
if (filter & FILE_NOTIFY_CHANGE_DIR_NAME)
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_CREATION)
mask |= IN_CREATE;
if (filter & FILE_NOTIFY_CHANGE_SECURITY)
mask |= IN_ATTRIB;
sprintf( link, "/proc/self/fd/%u", get_unix_fd( dir->fd ) );
dir->wd = inotify_add_watch( get_unix_fd( dir->inotify_fd ), link, mask );
if (dir->wd != -1)
set_fd_events( dir->inotify_fd, POLLIN );
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return 1;
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}
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#endif /* USE_INOTIFY */
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/* enable change notifications for a directory */
DECL_HANDLER(read_directory_changes)
{
struct event *event = NULL;
struct dir *dir;
if (!req->filter)
{
set_error(STATUS_INVALID_PARAMETER);
return;
}
dir = get_dir_obj( current->process, req->handle, 0 );
if (!dir)
return;
/* possibly send changes through an event flag */
if (req->event)
{
event = get_event_obj( current->process, req->event, EVENT_MODIFY_STATE );
if (!event)
goto end;
}
/* discard the current data, and move onto the next event */
if (dir->event) release_object( dir->event );
dir->event = event;
/* requests don't timeout */
if ( req->io_apc && !create_async( current, NULL, &dir->change_q,
req->io_apc, req->io_user, req->io_sb ))
return;
/* assign it once */
if (!dir->filter)
{
insert_change( dir );
dir->filter = req->filter;
dir->want_data = req->want_data;
}
/* remove any notifications */
if (dir->signaled>0)
dir->signaled--;
/* clear the event */
if (event)
reset_event( event );
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/* setup the real notification */
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#ifdef USE_INOTIFY
if (!inotify_adjust_changes( dir ))
#endif
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dnotify_adjust_changes( dir );
set_error(STATUS_PENDING);
end:
release_object( dir );
}
DECL_HANDLER(read_change)
{
struct change_record *record;
struct dir *dir;
dir = get_dir_obj( current->process, req->handle, 0 );
if (!dir)
return;
if ((record = get_first_change_record( dir )) != NULL)
{
reply->action = record->action;
set_reply_data( record->name, record->len );
free( record );
}
else
set_error( STATUS_NO_DATA_DETECTED );
/* now signal it */
dir->signaled++;
dir_signal_changed( dir );
release_object( dir );
}