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37773dda84
possible.
418 lines
12 KiB
C
418 lines
12 KiB
C
/*
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* Server-side mailslot management
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*
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* Copyright (C) 1998 Alexandre Julliard
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* Copyright (C) 2005 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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*/
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#include "config.h"
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#include "wine/port.h"
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#include "wine/unicode.h"
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#include <assert.h>
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#include <fcntl.h>
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#include <string.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#ifdef HAVE_SYS_IOCTL_H
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#include <sys/ioctl.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef HAVE_SYS_FILIO_H
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#include <sys/filio.h>
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#endif
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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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struct mailslot
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{
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struct object obj;
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struct fd *fd;
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struct fd *write_fd;
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unsigned int max_msgsize;
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unsigned int read_timeout;
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struct list writers;
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};
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/* mailslot functions */
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static void mailslot_dump( struct object*, int );
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static struct fd *mailslot_get_fd( struct object * );
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static void mailslot_destroy( struct object * );
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static const struct object_ops mailslot_ops =
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{
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sizeof(struct mailslot), /* size */
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mailslot_dump, /* dump */
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default_fd_add_queue, /* add_queue */
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default_fd_remove_queue, /* remove_queue */
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default_fd_signaled, /* signaled */
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no_satisfied, /* satisfied */
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no_signal, /* signal */
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mailslot_get_fd, /* get_fd */
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no_close_handle, /* close_handle */
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mailslot_destroy /* destroy */
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};
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static int mailslot_get_info( struct fd * );
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static void mailslot_queue_async( struct fd *, void*, void*, void*, int, int );
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static const struct fd_ops mailslot_fd_ops =
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{
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default_fd_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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mailslot_get_info, /* get_file_info */
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mailslot_queue_async, /* queue_async */
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default_fd_cancel_async /* cancel_async */
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};
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struct mail_writer
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{
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struct object obj;
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struct mailslot *mailslot;
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struct list entry;
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int access;
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int sharing;
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};
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static void mail_writer_dump( struct object *obj, int verbose );
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static struct fd *mail_writer_get_fd( struct object *obj );
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static void mail_writer_destroy( struct object *obj);
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static const struct object_ops mail_writer_ops =
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{
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sizeof(struct mail_writer), /* size */
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mail_writer_dump, /* dump */
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no_add_queue, /* add_queue */
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NULL, /* remove_queue */
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NULL, /* signaled */
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NULL, /* satisfied */
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no_signal, /* signal */
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mail_writer_get_fd, /* get_fd */
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no_close_handle, /* close_handle */
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mail_writer_destroy /* destroy */
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};
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static int mail_writer_get_info( struct fd *fd );
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static const struct fd_ops mail_writer_fd_ops =
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{
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NULL, /* get_poll_events */
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NULL, /* poll_event */
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no_flush, /* flush */
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mail_writer_get_info, /* get_file_info */
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no_queue_async, /* queue_async */
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NULL /* cancel_async */
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};
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static void mailslot_destroy( struct object *obj)
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{
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struct mailslot *mailslot = (struct mailslot *) obj;
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assert( mailslot->fd );
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assert( mailslot->write_fd );
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release_object( mailslot->fd );
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release_object( mailslot->write_fd );
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}
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static void mailslot_dump( struct object *obj, int verbose )
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{
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struct mailslot *mailslot = (struct mailslot *) obj;
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assert( obj->ops == &mailslot_ops );
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fprintf( stderr, "Mailslot max_msgsize=%d read_timeout=%d\n",
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mailslot->max_msgsize, mailslot->read_timeout );
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}
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static int mailslot_message_count(struct mailslot *mailslot)
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{
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struct pollfd pfd;
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/* poll the socket to see if there's any messages */
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pfd.fd = get_unix_fd( mailslot->fd );
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pfd.events = POLLIN;
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pfd.revents = 0;
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return (poll( &pfd, 1, 0 ) == 1) ? 1 : 0;
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}
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static int mailslot_next_msg_size( struct mailslot *mailslot )
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{
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int size, fd;
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size = 0;
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fd = get_unix_fd( mailslot->fd );
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ioctl( fd, FIONREAD, &size );
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return size;
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}
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static int mailslot_get_info( struct fd *fd )
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{
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struct mailslot *mailslot = get_fd_user( fd );
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assert( mailslot->obj.ops == &mailslot_ops );
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return FD_FLAG_TIMEOUT | FD_FLAG_AVAILABLE;
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}
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static struct fd *mailslot_get_fd( struct object *obj )
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{
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struct mailslot *mailslot = (struct mailslot *) obj;
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return (struct fd *)grab_object( mailslot->fd );
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}
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static void mailslot_queue_async( struct fd *fd, void *apc, void *user,
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void *iosb, int type, int count )
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{
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struct mailslot *mailslot = get_fd_user( fd );
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int *timeout = NULL;
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assert(mailslot->obj.ops == &mailslot_ops);
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if (type != ASYNC_TYPE_READ)
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{
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set_error(STATUS_INVALID_PARAMETER);
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return;
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}
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if (list_empty( &mailslot->writers ) ||
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!mailslot_message_count( mailslot ))
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{
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set_error(STATUS_IO_TIMEOUT);
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return;
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}
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if (mailslot->read_timeout != MAILSLOT_WAIT_FOREVER)
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timeout = &mailslot->read_timeout;
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fd_queue_async_timeout( fd, apc, user, iosb, type, count, timeout );
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}
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static struct mailslot *create_mailslot( const WCHAR *name, size_t len, int max_msgsize,
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int read_timeout )
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{
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struct mailslot *mailslot;
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int fds[2];
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static const WCHAR slot[] = {'m','a','i','l','s','l','o','t','\\',0};
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if (( len <= strlenW( slot )) || strncmpiW( slot, name, strlenW( slot ) ))
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{
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set_error( STATUS_OBJECT_NAME_INVALID );
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return NULL;
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}
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mailslot = create_named_object( sync_namespace, &mailslot_ops, name, len );
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if (!mailslot)
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return NULL;
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/* it already exists - there can only be one mailslot to read from */
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if (get_error() == STATUS_OBJECT_NAME_COLLISION)
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{
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release_object( mailslot );
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return NULL;
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}
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mailslot->fd = NULL;
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mailslot->write_fd = NULL;
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mailslot->max_msgsize = max_msgsize;
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mailslot->read_timeout = read_timeout;
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list_init( &mailslot->writers );
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if (!socketpair( PF_UNIX, SOCK_DGRAM, 0, fds ))
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{
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fcntl( fds[0], F_SETFL, O_NONBLOCK );
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fcntl( fds[1], F_SETFL, O_NONBLOCK );
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mailslot->fd = create_anonymous_fd( &mailslot_fd_ops,
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fds[1], &mailslot->obj );
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mailslot->write_fd = create_anonymous_fd( &mail_writer_fd_ops,
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fds[0], &mailslot->obj );
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if (mailslot->fd && mailslot->write_fd) return mailslot;
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}
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else file_set_error();
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release_object( mailslot );
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return NULL;
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}
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static struct mailslot *open_mailslot( const WCHAR *name, size_t len )
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{
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struct object *obj;
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obj = find_object( sync_namespace, name, len );
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if (obj)
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{
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if (obj->ops == &mailslot_ops)
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return (struct mailslot *)obj;
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release_object( obj );
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set_error( STATUS_OBJECT_TYPE_MISMATCH );
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}
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else
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set_error( STATUS_OBJECT_NAME_NOT_FOUND );
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return NULL;
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}
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static void mail_writer_dump( struct object *obj, int verbose )
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{
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fprintf( stderr, "Mailslot writer\n" );
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}
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static void mail_writer_destroy( struct object *obj)
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{
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struct mail_writer *writer = (struct mail_writer *) obj;
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list_remove( &writer->entry );
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release_object( writer->mailslot );
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}
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static int mail_writer_get_info( struct fd *fd )
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{
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return 0;
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}
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static struct fd *mail_writer_get_fd( struct object *obj )
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{
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struct mail_writer *writer = (struct mail_writer *) obj;
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return (struct fd *)grab_object( writer->mailslot->write_fd );
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}
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/*
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* Readers and writers cannot be mixed.
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* If there's more than one writer, all writers must open with FILE_SHARE_WRITE
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*/
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static struct mail_writer *create_mail_writer( struct mailslot *mailslot, unsigned int access,
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unsigned int sharing )
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{
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struct mail_writer *writer;
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if (!list_empty( &mailslot->writers ))
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{
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writer = LIST_ENTRY( list_head(&mailslot->writers), struct mail_writer, entry );
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if (((access & GENERIC_WRITE) || (writer->access & GENERIC_WRITE)) &&
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!((sharing & FILE_SHARE_WRITE) && (writer->sharing & FILE_SHARE_WRITE)))
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{
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set_error( STATUS_SHARING_VIOLATION );
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return NULL;
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}
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}
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writer = alloc_object( &mail_writer_ops );
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if (!writer)
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return NULL;
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grab_object( mailslot );
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writer->mailslot = mailslot;
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writer->access = access;
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writer->sharing = sharing;
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list_add_head( &mailslot->writers, &writer->entry );
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return writer;
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}
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static struct mailslot *get_mailslot_obj( struct process *process, obj_handle_t handle,
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unsigned int access )
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{
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struct object *obj;
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obj = get_handle_obj( process, handle, access, &mailslot_ops );
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return (struct mailslot *) obj;
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}
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/* create a mailslot */
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DECL_HANDLER(create_mailslot)
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{
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struct mailslot *mailslot;
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reply->handle = 0;
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mailslot = create_mailslot( get_req_data(), get_req_data_size(),
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req->max_msgsize, req->read_timeout );
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if (mailslot)
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{
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reply->handle = alloc_handle( current->process, mailslot,
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GENERIC_READ, req->inherit );
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release_object( mailslot );
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}
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}
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/* open an existing mailslot */
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DECL_HANDLER(open_mailslot)
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{
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struct mailslot *mailslot;
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reply->handle = 0;
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if (!(req->sharing & FILE_SHARE_READ))
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{
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set_error( STATUS_SHARING_VIOLATION );
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return;
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}
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mailslot = open_mailslot( get_req_data(), get_req_data_size() );
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if (mailslot)
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{
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struct mail_writer *writer;
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writer = create_mail_writer( mailslot, req->access, req->sharing );
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if (writer)
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{
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reply->handle = alloc_handle( current->process, writer,
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req->access, req->inherit );
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release_object( writer );
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}
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release_object( mailslot );
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}
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else
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set_error( STATUS_NO_SUCH_FILE );
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}
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/* set mailslot information */
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DECL_HANDLER(set_mailslot_info)
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{
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struct mailslot *mailslot = get_mailslot_obj( current->process, req->handle, 0 );
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if (mailslot)
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{
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if (req->flags & MAILSLOT_SET_READ_TIMEOUT)
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mailslot->read_timeout = req->read_timeout;
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reply->max_msgsize = mailslot->max_msgsize;
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reply->read_timeout = mailslot->read_timeout;
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reply->msg_count = mailslot_message_count(mailslot);
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/* get the size of the next message */
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if (reply->msg_count)
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reply->next_msgsize = mailslot_next_msg_size(mailslot);
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else
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reply->next_msgsize = MAILSLOT_NO_MESSAGE;
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release_object( mailslot );
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}
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}
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