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server: Initial inotify support.

This commit is contained in:
Mike McCormack 2006-01-30 18:15:31 +01:00 committed by Alexandre Julliard
parent bd185ff3de
commit fdf0c684f5
1 changed files with 223 additions and 15 deletions
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238
server/change.c
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@ -28,6 +28,10 @@
#include <stdlib.h>
#include <signal.h>
#include <sys/stat.h>
#include <errno.h>
#ifdef HAVE_SYS_ERRNO_H
#include <sys/errno.h>
#endif
#include "ntstatus.h"
#define WIN32_NO_STATUS
@ -39,6 +43,8 @@
#include "request.h"
#include "winternl.h"
/* dnotify support */
#ifdef linux
#ifndef F_NOTIFY
#define F_NOTIFY 1026
@ -52,6 +58,92 @@
#endif
#endif
/* 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;
}
#else
static inline int inotify_init( void )
{
errno = ENOSYS;
return -1;
}
static inline int inotify_add_watch( int fd, const char *name, unsigned int mask )
{
errno = ENOSYS;
return -1;
}
static inline int inotify_remove_watch( int fd, int wd )
{
errno = ENOSYS;
return -1;
}
#endif
struct dir
{
struct object obj; /* object header */
@ -61,6 +153,8 @@ struct dir
unsigned int filter; /* notification filter */
int notified; /* SIGIO counter */
long signaled; /* the file changed */
struct fd *inotify_fd; /* inotify file descriptor */
int wd; /* inotify watch descriptor */
};
static struct fd *dir_get_fd( struct object *obj );
@ -100,9 +194,11 @@ static const struct fd_ops dir_fd_ops =
static struct list change_list = LIST_INIT(change_list);
static void adjust_changes( int fd, unsigned int filter )
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;
@ -159,11 +255,13 @@ struct object *create_dir_obj( struct fd *fd )
dir = alloc_object( &dir_ops );
if (!dir)
return NULL;
dir->event = NULL;
dir->filter = 0;
dir->notified = 0;
dir->signaled = 0;
dir->inotify_fd = NULL;
dir->wd = -1;
grab_object( fd );
dir->fd = fd;
set_fd_user( fd, &dir_fd_ops, &dir->obj );
@ -189,37 +287,38 @@ static int dir_signaled( struct object *obj, struct thread *thread )
/* enter here directly from SIGIO signal handler */
void do_change_notify( int unix_fd )
{
struct list *ptr;
struct dir *dir;
/* FIXME: this is O(n) ... probably can be improved */
LIST_FOR_EACH( ptr, &change_list )
LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )
{
struct dir *dir = LIST_ENTRY( ptr, struct dir, entry );
if (get_unix_fd( dir->fd ) != unix_fd) continue;
interlocked_xchg_add( &dir->notified, 1 );
break;
}
}
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)
{
struct list *ptr;
struct dir *dir;
LIST_FOR_EACH( ptr, &change_list )
LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )
{
struct dir *dir = LIST_ENTRY( ptr, struct dir, entry );
long count = interlocked_xchg( &dir->notified, 0 );
if (count)
{
dir->signaled += count;
if (dir->signaled == count) /* was it 0? */
{
if (dir->event)
set_event( dir->event );
else
wake_up( &dir->obj, 0 );
}
dir_signal_changed( dir );
}
}
}
@ -248,6 +347,13 @@ static void dir_destroy( struct object *obj )
if (dir->filter)
remove_change( dir );
if (dir->inotify_fd)
{
if (dir->wd != -1)
inotify_remove_watch( get_unix_fd( dir->inotify_fd ), dir->wd );
release_object( dir->inotify_fd );
}
if (dir->event)
{
set_event( dir->event );
@ -272,6 +378,101 @@ static int dir_get_info( struct fd *fd )
return 0;
}
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 )
{
dir->signaled++;
dir_signal_changed( dir );
}
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; )
{
ie = (struct inotify_event*) &buffer[ofs];
if (!ie->len)
break;
inotify_do_change_notify( dir );
ofs += (sizeof (*ie) + ie->len - 1);
}
}
static int inotify_get_info( struct fd *fd )
{
return 0;
}
static void inotify_adjust_changes( struct dir *dir )
{
int filter = dir->filter;
unsigned int mask = 0;
char link[32];
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 );
}
static 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 );
}
/* enable change notifications for a directory */
DECL_HANDLER(read_directory_changes)
{
@ -311,7 +512,14 @@ DECL_HANDLER(read_directory_changes)
if (dir->signaled>0)
dir->signaled--;
adjust_changes( get_unix_fd( dir->fd ), dir->filter );
if (!dir->inotify_fd)
dir->inotify_fd = create_inotify_fd( dir );
/* setup the real notification */
if (dir->inotify_fd)
inotify_adjust_changes( dir );
else
dnotify_adjust_changes( dir );
set_error(STATUS_PENDING);