596 lines
16 KiB
C
596 lines
16 KiB
C
/*
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* Server-side change notification management
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*
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* Copyright (C) 1998 Alexandre Julliard
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* Copyright (C) 2006 Mike McCormack
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <assert.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <sys/stat.h>
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#include <errno.h>
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#ifdef HAVE_SYS_ERRNO_H
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#include <sys/errno.h>
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#endif
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#include "ntstatus.h"
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#define WIN32_NO_STATUS
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#include "windef.h"
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#include "file.h"
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#include "handle.h"
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#include "thread.h"
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#include "request.h"
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#include "winternl.h"
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/* dnotify support */
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#ifdef linux
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#ifndef F_NOTIFY
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#define F_NOTIFY 1026
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#define DN_ACCESS 0x00000001 /* File accessed */
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#define DN_MODIFY 0x00000002 /* File modified */
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#define DN_CREATE 0x00000004 /* File created */
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#define DN_DELETE 0x00000008 /* File removed */
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#define DN_RENAME 0x00000010 /* File renamed */
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#define DN_ATTRIB 0x00000020 /* File changed attibutes */
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#define DN_MULTISHOT 0x80000000 /* Don't remove notifier */
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#endif
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#endif
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/* inotify support */
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#if defined(__linux__) && defined(__i386__)
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#define SYS_inotify_init 291
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#define SYS_inotify_add_watch 292
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#define SYS_inotify_rm_watch 293
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struct inotify_event {
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int wd;
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unsigned int mask;
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unsigned int cookie;
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unsigned int len;
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char name[1];
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};
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#define IN_ACCESS 0x00000001
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#define IN_MODIFY 0x00000002
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#define IN_ATTRIB 0x00000004
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#define IN_CLOSE_WRITE 0x00000008
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#define IN_CLOSE_NOWRITE 0x00000010
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#define IN_OPEN 0x00000020
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#define IN_MOVED_FROM 0x00000040
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#define IN_MOVED_TO 0x00000080
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#define IN_CREATE 0x00000100
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#define IN_DELETE 0x00000200
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#define IN_DELETE_SELF 0x00000400
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static inline int inotify_init( void )
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{
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int ret;
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__asm__ __volatile__( "int $0x80"
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: "=a" (ret)
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: "0" (SYS_inotify_init));
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if (ret<0) { errno = -ret; ret = -1; }
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return ret;
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}
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static inline int inotify_add_watch( int fd, const char *name, unsigned int mask )
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{
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int ret;
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__asm__ __volatile__( "pushl %%ebx;\n\t"
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"movl %2,%%ebx;\n\t"
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"int $0x80;\n\t"
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"popl %%ebx"
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: "=a" (ret) : "0" (SYS_inotify_add_watch),
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"r" (fd), "c" (name), "d" (mask) );
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if (ret<0) { errno = -ret; ret = -1; }
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return ret;
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}
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static inline int inotify_remove_watch( int fd, int wd )
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{
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int ret;
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__asm__ __volatile__( "pushl %%ebx;\n\t"
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"movl %2,%%ebx;\n\t"
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"int $0x80;\n\t"
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"popl %%ebx"
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: "=a" (ret) : "0" (SYS_inotify_rm_watch),
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"r" (fd), "c" (wd) );
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if (ret<0) { errno = -ret; ret = -1; }
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return ret;
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}
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#define USE_INOTIFY
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#endif
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struct change_record {
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struct list entry;
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int action;
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int len;
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char name[1];
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};
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struct dir
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{
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struct object obj; /* object header */
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struct fd *fd; /* file descriptor to the directory */
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struct list entry; /* entry in global change notifications list */
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struct event *event;
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unsigned int filter; /* notification filter */
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int notified; /* SIGIO counter */
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long signaled; /* the file changed */
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struct fd *inotify_fd; /* inotify file descriptor */
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int wd; /* inotify watch descriptor */
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struct list change_q; /* change readers */
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struct list change_records; /* data for the change */
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};
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static struct fd *dir_get_fd( struct object *obj );
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static unsigned int dir_map_access( struct object *obj, unsigned int access );
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static void dir_dump( struct object *obj, int verbose );
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static void dir_destroy( struct object *obj );
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static int dir_signaled( struct object *obj, struct thread *thread );
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static const struct object_ops dir_ops =
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{
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sizeof(struct dir), /* size */
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dir_dump, /* dump */
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add_queue, /* add_queue */
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remove_queue, /* remove_queue */
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dir_signaled, /* signaled */
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no_satisfied, /* satisfied */
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no_signal, /* signal */
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dir_get_fd, /* get_fd */
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dir_map_access, /* map_access */
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no_lookup_name, /* lookup_name */
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no_close_handle, /* close_handle */
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dir_destroy /* destroy */
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};
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static int dir_get_poll_events( struct fd *fd );
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static int dir_get_info( struct fd *fd );
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static void dir_cancel_async( struct fd *fd );
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static const struct fd_ops dir_fd_ops =
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{
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dir_get_poll_events, /* get_poll_events */
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default_poll_event, /* poll_event */
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no_flush, /* flush */
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dir_get_info, /* get_file_info */
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default_fd_queue_async, /* queue_async */
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dir_cancel_async /* cancel_async */
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};
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static struct list change_list = LIST_INIT(change_list);
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static void dnotify_adjust_changes( struct dir *dir )
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{
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#if defined(F_SETSIG) && defined(F_NOTIFY)
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int fd = get_unix_fd( dir->fd );
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unsigned int filter = dir->filter;
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unsigned int val;
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if ( 0 > fcntl( fd, F_SETSIG, SIGIO) )
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return;
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val = DN_MULTISHOT;
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if (filter & FILE_NOTIFY_CHANGE_FILE_NAME)
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val |= DN_RENAME | DN_DELETE | DN_CREATE;
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if (filter & FILE_NOTIFY_CHANGE_DIR_NAME)
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val |= DN_RENAME | DN_DELETE | DN_CREATE;
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if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
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val |= DN_ATTRIB;
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if (filter & FILE_NOTIFY_CHANGE_SIZE)
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val |= DN_MODIFY;
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if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
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val |= DN_MODIFY;
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if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
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val |= DN_ACCESS;
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if (filter & FILE_NOTIFY_CHANGE_CREATION)
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val |= DN_CREATE;
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if (filter & FILE_NOTIFY_CHANGE_SECURITY)
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val |= DN_ATTRIB;
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fcntl( fd, F_NOTIFY, val );
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#endif
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}
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/* insert change in the global list */
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static inline void insert_change( struct dir *dir )
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{
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sigset_t sigset;
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sigemptyset( &sigset );
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sigaddset( &sigset, SIGIO );
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sigprocmask( SIG_BLOCK, &sigset, NULL );
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list_add_head( &change_list, &dir->entry );
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sigprocmask( SIG_UNBLOCK, &sigset, NULL );
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}
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/* remove change from the global list */
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static inline void remove_change( struct dir *dir )
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{
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sigset_t sigset;
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sigemptyset( &sigset );
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sigaddset( &sigset, SIGIO );
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sigprocmask( SIG_BLOCK, &sigset, NULL );
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list_remove( &dir->entry );
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sigprocmask( SIG_UNBLOCK, &sigset, NULL );
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}
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struct object *create_dir_obj( struct fd *fd )
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{
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struct dir *dir;
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dir = alloc_object( &dir_ops );
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if (!dir)
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return NULL;
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list_init( &dir->change_q );
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list_init( &dir->change_records );
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dir->event = NULL;
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dir->filter = 0;
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dir->notified = 0;
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dir->signaled = 0;
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dir->inotify_fd = NULL;
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dir->wd = -1;
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grab_object( fd );
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dir->fd = fd;
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set_fd_user( fd, &dir_fd_ops, &dir->obj );
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return &dir->obj;
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}
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static void dir_dump( struct object *obj, int verbose )
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{
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struct dir *dir = (struct dir *)obj;
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assert( obj->ops == &dir_ops );
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fprintf( stderr, "Dirfile fd=%p event=%p filter=%08x\n",
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dir->fd, dir->event, dir->filter );
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}
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static int dir_signaled( struct object *obj, struct thread *thread )
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{
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struct dir *dir = (struct dir *)obj;
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assert (obj->ops == &dir_ops);
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return (dir->event == NULL) && dir->signaled;
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}
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/* enter here directly from SIGIO signal handler */
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void do_change_notify( int unix_fd )
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{
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struct dir *dir;
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/* FIXME: this is O(n) ... probably can be improved */
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LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )
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{
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if (get_unix_fd( dir->fd ) != unix_fd) continue;
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interlocked_xchg_add( &dir->notified, 1 );
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break;
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}
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}
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static void dir_signal_changed( struct dir *dir )
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{
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if (dir->event)
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set_event( dir->event );
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else
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wake_up( &dir->obj, 0 );
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}
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/* SIGIO callback, called synchronously with the poll loop */
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void sigio_callback(void)
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{
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struct dir *dir;
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LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )
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{
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long count = interlocked_xchg( &dir->notified, 0 );
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if (count)
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{
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dir->signaled += count;
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if (dir->signaled == count) /* was it 0? */
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dir_signal_changed( dir );
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}
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}
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}
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static struct fd *dir_get_fd( struct object *obj )
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{
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struct dir *dir = (struct dir *)obj;
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assert( obj->ops == &dir_ops );
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return (struct fd *)grab_object( dir->fd );
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}
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static unsigned int dir_map_access( struct object *obj, unsigned int access )
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{
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if (access & GENERIC_READ) access |= FILE_GENERIC_READ;
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if (access & GENERIC_WRITE) access |= FILE_GENERIC_WRITE;
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if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
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if (access & GENERIC_ALL) access |= FILE_ALL_ACCESS;
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return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
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}
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static struct change_record *get_first_change_record( struct dir *dir )
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{
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struct list *ptr = list_head( &dir->change_records );
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if (!ptr) return NULL;
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list_remove( ptr );
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return LIST_ENTRY( ptr, struct change_record, entry );
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}
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static void dir_destroy( struct object *obj )
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{
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struct change_record *record;
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struct dir *dir = (struct dir *)obj;
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assert (obj->ops == &dir_ops);
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if (dir->filter)
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remove_change( dir );
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if (dir->inotify_fd)
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release_object( dir->inotify_fd );
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async_terminate_queue( &dir->change_q, STATUS_CANCELLED );
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while ((record = get_first_change_record( dir ))) free( record );
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if (dir->event)
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{
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set_event( dir->event );
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release_object( dir->event );
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}
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release_object( dir->fd );
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}
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static struct dir *
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get_dir_obj( struct process *process, obj_handle_t handle, unsigned int access )
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{
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return (struct dir *)get_handle_obj( process, handle, access, &dir_ops );
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}
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static int dir_get_poll_events( struct fd *fd )
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{
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return 0;
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}
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static int dir_get_info( struct fd *fd )
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{
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return 0;
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}
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static void dir_cancel_async( struct fd *fd )
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{
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struct dir *dir = (struct dir *) get_fd_user( fd );
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async_terminate_queue( &dir->change_q, STATUS_CANCELLED );
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}
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#ifdef USE_INOTIFY
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static int inotify_get_poll_events( struct fd *fd );
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static void inotify_poll_event( struct fd *fd, int event );
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static int inotify_get_info( struct fd *fd );
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static const struct fd_ops inotify_fd_ops =
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{
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inotify_get_poll_events, /* get_poll_events */
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inotify_poll_event, /* poll_event */
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no_flush, /* flush */
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inotify_get_info, /* get_file_info */
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default_fd_queue_async, /* queue_async */
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default_fd_cancel_async, /* cancel_async */
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};
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static int inotify_get_poll_events( struct fd *fd )
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{
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return POLLIN;
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}
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static void inotify_do_change_notify( struct dir *dir, struct inotify_event *ie )
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{
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struct change_record *record;
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record = malloc( sizeof (*record) + ie->len - 1 ) ;
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if (!record)
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return;
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if( ie->mask & IN_CREATE )
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record->action = FILE_ACTION_ADDED;
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else if( ie->mask & IN_DELETE )
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record->action = FILE_ACTION_REMOVED;
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else
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record->action = FILE_ACTION_MODIFIED;
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memcpy( record->name, ie->name, ie->len );
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record->len = strlen( ie->name );
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list_add_tail( &dir->change_records, &record->entry );
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if (!list_empty( &dir->change_q ))
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async_terminate_head( &dir->change_q, STATUS_ALERTED );
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else
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{
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dir->signaled++;
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dir_signal_changed( dir );
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}
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}
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static void inotify_poll_event( struct fd *fd, int event )
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{
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int r, ofs, unix_fd;
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char buffer[0x1000];
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struct inotify_event *ie;
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struct dir *dir = get_fd_user( fd );
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unix_fd = get_unix_fd( fd );
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r = read( unix_fd, buffer, sizeof buffer );
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if (r < 0)
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{
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fprintf(stderr,"inotify_poll_event(): inotify read failed!\n");
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return;
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}
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for( ofs = 0; ofs < r; )
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{
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ie = (struct inotify_event*) &buffer[ofs];
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if (!ie->len)
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break;
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inotify_do_change_notify( dir, ie );
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ofs += (sizeof (*ie) + ie->len - 1);
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}
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}
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static int inotify_get_info( struct fd *fd )
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{
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return 0;
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}
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static inline struct fd *create_inotify_fd( struct dir *dir )
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{
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int unix_fd;
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unix_fd = inotify_init();
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if (unix_fd<0)
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return NULL;
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return create_anonymous_fd( &inotify_fd_ops, unix_fd, &dir->obj );
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}
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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;
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char link[32];
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if (!dir->inotify_fd)
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{
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if (!(dir->inotify_fd = create_inotify_fd( dir ))) return 0;
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}
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if (filter & FILE_NOTIFY_CHANGE_FILE_NAME)
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mask |= (IN_MOVED_FROM | IN_MOVED_TO | IN_DELETE | IN_CREATE);
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if (filter & FILE_NOTIFY_CHANGE_DIR_NAME)
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mask |= (IN_MOVED_FROM | IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF);
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if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
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mask |= IN_ATTRIB;
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if (filter & FILE_NOTIFY_CHANGE_SIZE)
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mask |= IN_MODIFY;
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if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
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mask |= IN_MODIFY;
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if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
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mask |= IN_ACCESS;
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if (filter & FILE_NOTIFY_CHANGE_CREATION)
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mask |= IN_CREATE;
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if (filter & FILE_NOTIFY_CHANGE_SECURITY)
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mask |= IN_ATTRIB;
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sprintf( link, "/proc/self/fd/%u", get_unix_fd( dir->fd ) );
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dir->wd = inotify_add_watch( get_unix_fd( dir->inotify_fd ), link, mask );
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if (dir->wd != -1)
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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 */
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DECL_HANDLER(read_directory_changes)
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{
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struct event *event = NULL;
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struct dir *dir;
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if (!req->filter)
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{
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set_error(STATUS_INVALID_PARAMETER);
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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;
|
|
}
|
|
|
|
/* remove any notifications */
|
|
if (dir->signaled>0)
|
|
dir->signaled--;
|
|
|
|
/* setup the real notification */
|
|
#ifdef USE_INOTIFY
|
|
if (!inotify_adjust_changes( dir ))
|
|
#endif
|
|
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 );
|
|
}
|