2 * Server-side mailslot management
4 * Copyright (C) 1998 Alexandre Julliard
5 * Copyright (C) 2005 Mike McCormack
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include "wine/port.h"
25 #include "wine/unicode.h"
34 #include <sys/types.h>
36 #ifdef HAVE_SYS_IOCTL_H
37 #include <sys/ioctl.h>
39 #ifdef HAVE_SYS_SOCKET_H
40 #include <sys/socket.h>
42 #ifdef HAVE_SYS_FILIO_H
43 #include <sys/filio.h>
58 unsigned int max_msgsize;
59 unsigned int read_timeout;
64 /* mailslot functions */
65 static void mailslot_dump( struct object*, int );
66 static struct fd *mailslot_get_fd( struct object * );
67 static void mailslot_destroy( struct object * );
69 static const struct object_ops mailslot_ops =
71 sizeof(struct mailslot), /* size */
72 mailslot_dump, /* dump */
73 default_fd_add_queue, /* add_queue */
74 default_fd_remove_queue, /* remove_queue */
75 default_fd_signaled, /* signaled */
76 no_satisfied, /* satisfied */
77 no_signal, /* signal */
78 mailslot_get_fd, /* get_fd */
79 mailslot_destroy /* destroy */
82 static int mailslot_get_poll_events( struct fd * );
83 static void mailslot_poll_event( struct fd *, int );
84 static int mailslot_get_info( struct fd * );
85 static void mailslot_queue_async( struct fd *, void*, void*, void*, int, int );
86 static void mailslot_cancel_async( struct fd * );
88 static const struct fd_ops mailslot_fd_ops =
90 mailslot_get_poll_events, /* get_poll_events */
91 mailslot_poll_event, /* poll_event */
93 mailslot_get_info, /* get_file_info */
94 mailslot_queue_async, /* queue_async */
95 mailslot_cancel_async /* cancel_async */
101 struct mailslot *mailslot;
107 static void mail_writer_dump( struct object *obj, int verbose );
108 static struct fd *mail_writer_get_fd( struct object *obj );
109 static void mail_writer_destroy( struct object *obj);
111 static const struct object_ops mail_writer_ops =
113 sizeof(struct mail_writer), /* size */
114 mail_writer_dump, /* dump */
115 no_add_queue, /* add_queue */
116 NULL, /* remove_queue */
118 NULL, /* satisfied */
119 no_signal, /* signal */
120 mail_writer_get_fd, /* get_fd */
121 mail_writer_destroy /* destroy */
124 static int mail_writer_get_info( struct fd *fd );
126 static const struct fd_ops mail_writer_fd_ops =
128 NULL, /* get_poll_events */
129 NULL, /* poll_event */
130 no_flush, /* flush */
131 mail_writer_get_info, /* get_file_info */
132 no_queue_async, /* queue_async */
133 NULL /* cancel_async */
136 static void mailslot_destroy( struct object *obj)
138 struct mailslot *mailslot = (struct mailslot *) obj;
140 assert( mailslot->fd );
141 assert( mailslot->write_fd );
143 async_terminate_queue( &mailslot->read_q, STATUS_CANCELLED );
145 release_object( mailslot->fd );
146 release_object( mailslot->write_fd );
149 static void mailslot_dump( struct object *obj, int verbose )
151 struct mailslot *mailslot = (struct mailslot *) obj;
153 assert( obj->ops == &mailslot_ops );
154 fprintf( stderr, "Mailslot max_msgsize=%d read_timeout=%d\n",
155 mailslot->max_msgsize, mailslot->read_timeout );
158 static int mailslot_message_count(struct mailslot *mailslot)
162 /* poll the socket to see if there's any messages */
163 pfd.fd = get_unix_fd( mailslot->fd );
166 return (poll( &pfd, 1, 0 ) == 1) ? 1 : 0;
169 static int mailslot_next_msg_size( struct mailslot *mailslot )
174 fd = get_unix_fd( mailslot->fd );
175 ioctl( fd, FIONREAD, &size );
179 static int mailslot_get_info( struct fd *fd )
181 struct mailslot *mailslot = get_fd_user( fd );
182 assert( mailslot->obj.ops == &mailslot_ops );
183 return FD_FLAG_TIMEOUT | FD_FLAG_AVAILABLE;
186 static struct fd *mailslot_get_fd( struct object *obj )
188 struct mailslot *mailslot = (struct mailslot *) obj;
190 return (struct fd *)grab_object( mailslot->fd );
193 static int mailslot_get_poll_events( struct fd *fd )
195 struct mailslot *mailslot = get_fd_user( fd );
197 assert( mailslot->obj.ops == &mailslot_ops );
199 if( !list_empty( &mailslot->read_q ))
205 static void mailslot_poll_event( struct fd *fd, int event )
207 struct mailslot *mailslot = get_fd_user( fd );
209 if( !list_empty( &mailslot->read_q ) && (POLLIN & event) )
210 async_terminate_head( &mailslot->read_q, STATUS_ALERTED );
212 set_fd_events( fd, mailslot_get_poll_events(fd) );
215 static void mailslot_queue_async( struct fd *fd, void *apc, void *user,
216 void *iosb, int type, int count )
218 struct mailslot *mailslot = get_fd_user( fd );
219 int events, *ptimeout = NULL;
221 assert(mailslot->obj.ops == &mailslot_ops);
223 if( type != ASYNC_TYPE_READ )
225 set_error(STATUS_INVALID_PARAMETER);
229 if( list_empty( &mailslot->writers ) ||
230 !mailslot_message_count( mailslot ))
232 set_error(STATUS_IO_TIMEOUT);
236 if (mailslot->read_timeout != MAILSLOT_WAIT_FOREVER)
237 ptimeout = &mailslot->read_timeout;
239 if (!create_async( current, ptimeout, &mailslot->read_q, apc, user, iosb ))
242 /* Check if the new pending request can be served immediately */
243 events = check_fd_events( fd, mailslot_get_poll_events( fd ) );
246 mailslot_poll_event( fd, events );
250 set_fd_events( fd, mailslot_get_poll_events( fd ));
253 static void mailslot_cancel_async( struct fd *fd )
255 struct mailslot *mailslot = get_fd_user( fd );
257 assert(mailslot->obj.ops == &mailslot_ops);
258 async_terminate_queue( &mailslot->read_q, STATUS_CANCELLED );
261 static struct mailslot *create_mailslot( const WCHAR *name, size_t len, int max_msgsize,
264 struct mailslot *mailslot;
266 static const WCHAR slot[] = {'m','a','i','l','s','l','o','t','\\',0};
268 if( ( len <= strlenW( slot ) ) || strncmpiW( slot, name, strlenW( slot ) ) )
270 set_error( STATUS_OBJECT_NAME_INVALID );
274 mailslot = create_named_object( sync_namespace, &mailslot_ops, name, len );
278 /* it already exists - there can only be one mailslot to read from */
279 if( get_error() == STATUS_OBJECT_NAME_COLLISION )
281 release_object( mailslot );
286 mailslot->write_fd = NULL;
287 mailslot->max_msgsize = max_msgsize;
288 mailslot->read_timeout = read_timeout;
289 list_init( &mailslot->writers );
290 list_init( &mailslot->read_q );
292 if( !socketpair( PF_UNIX, SOCK_DGRAM, 0, fds ) )
294 fcntl( fds[0], F_SETFL, O_NONBLOCK );
295 fcntl( fds[1], F_SETFL, O_NONBLOCK );
296 mailslot->fd = create_anonymous_fd( &mailslot_fd_ops,
297 fds[1], &mailslot->obj );
298 mailslot->write_fd = create_anonymous_fd( &mail_writer_fd_ops,
299 fds[0], &mailslot->obj );
300 if( mailslot->fd && mailslot->write_fd ) return mailslot;
302 else file_set_error();
304 release_object( mailslot );
308 static struct mailslot *open_mailslot( const WCHAR *name, size_t len )
312 obj = find_object( sync_namespace, name, len );
315 if (obj->ops == &mailslot_ops)
316 return (struct mailslot *)obj;
317 release_object( obj );
318 set_error( STATUS_OBJECT_TYPE_MISMATCH );
321 set_error( STATUS_OBJECT_NAME_NOT_FOUND );
326 static void mail_writer_dump( struct object *obj, int verbose )
328 fprintf( stderr, "Mailslot writer\n" );
331 static void mail_writer_destroy( struct object *obj)
333 struct mail_writer *writer = (struct mail_writer *) obj;
335 list_remove( &writer->entry );
336 release_object( writer->mailslot );
339 static int mail_writer_get_info( struct fd *fd )
344 static struct fd *mail_writer_get_fd( struct object *obj )
346 struct mail_writer *writer = (struct mail_writer *) obj;
348 return (struct fd *)grab_object( writer->mailslot->write_fd );
352 * Readers and writers cannot be mixed.
353 * If there's more than one writer, all writers must open with FILE_SHARE_WRITE
355 static struct mail_writer *create_mail_writer( struct mailslot *mailslot, unsigned int access,
356 unsigned int sharing )
358 struct mail_writer *writer;
360 if (!list_empty( &mailslot->writers ))
362 writer = LIST_ENTRY( list_head(&mailslot->writers), struct mail_writer, entry );
364 if (((access & GENERIC_WRITE) || (writer->access & GENERIC_WRITE)) &&
365 !((sharing & FILE_SHARE_WRITE) && (writer->sharing & FILE_SHARE_WRITE)))
367 set_error( STATUS_SHARING_VIOLATION );
372 writer = alloc_object( &mail_writer_ops );
376 grab_object( mailslot );
377 writer->mailslot = mailslot;
378 writer->access = access;
379 writer->sharing = sharing;
381 list_add_head( &mailslot->writers, &writer->entry );
386 static struct mailslot *get_mailslot_obj( struct process *process, obj_handle_t handle,
387 unsigned int access )
390 obj = get_handle_obj( process, handle, access, &mailslot_ops );
391 return (struct mailslot *) obj;
395 /* create a mailslot */
396 DECL_HANDLER(create_mailslot)
398 struct mailslot *mailslot;
401 mailslot = create_mailslot( get_req_data(), get_req_data_size(),
402 req->max_msgsize, req->read_timeout );
405 reply->handle = alloc_handle( current->process, mailslot,
406 GENERIC_READ, req->inherit );
407 release_object( mailslot );
412 /* open an existing mailslot */
413 DECL_HANDLER(open_mailslot)
415 struct mailslot *mailslot;
419 if( ! ( req->sharing & FILE_SHARE_READ ) )
421 set_error( STATUS_SHARING_VIOLATION );
425 mailslot = open_mailslot( get_req_data(), get_req_data_size() );
428 struct mail_writer *writer;
430 writer = create_mail_writer( mailslot, req->access, req->sharing );
433 reply->handle = alloc_handle( current->process, writer,
434 req->access, req->inherit );
435 release_object( writer );
437 release_object( mailslot );
440 set_error( STATUS_NO_SUCH_FILE );
444 /* set mailslot information */
445 DECL_HANDLER(set_mailslot_info)
447 struct mailslot *mailslot = get_mailslot_obj( current->process, req->handle, 0 );
451 if( req->flags & MAILSLOT_SET_READ_TIMEOUT )
452 mailslot->read_timeout = req->read_timeout;
453 reply->max_msgsize = mailslot->max_msgsize;
454 reply->read_timeout = mailslot->read_timeout;
455 reply->msg_count = mailslot_message_count(mailslot);
457 /* get the size of the next message */
458 if( reply->msg_count )
459 reply->next_msgsize = mailslot_next_msg_size(mailslot);
461 reply->next_msgsize = MAILSLOT_NO_MESSAGE;
463 release_object( mailslot );