/* * Server-side pipe management * * Copyright (C) 1998 Alexandre Julliard * Copyright (C) 2001 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA * * TODO: * message mode */ #include "config.h" #include "wine/port.h" #include #include #include #include #include #include #include #include #ifdef HAVE_SYS_SOCKET_H #include #endif #include #include #ifdef HAVE_POLL_H #include #endif #include "ntstatus.h" #define WIN32_NO_STATUS #include "windef.h" #include "winternl.h" #include "file.h" #include "handle.h" #include "thread.h" #include "request.h" enum pipe_state { ps_idle_server, ps_wait_open, ps_connected_server, ps_wait_disconnect, ps_disconnected_server, ps_wait_connect }; struct named_pipe; struct pipe_server { struct object obj; /* object header */ struct fd *fd; /* pipe file descriptor */ struct list entry; /* entry in named pipe servers list */ enum pipe_state state; /* server state */ struct pipe_client *client; /* client that this server is connected to */ struct named_pipe *pipe; struct timeout_user *flush_poll; struct event *event; struct list wait_q; /* only a single one can be queued */ unsigned int options; /* pipe options */ }; struct pipe_client { struct object obj; /* object header */ struct fd *fd; /* pipe file descriptor */ struct pipe_server *server; /* server that this client is connected to */ unsigned int flags; /* file flags */ }; struct named_pipe { struct object obj; /* object header */ unsigned int flags; unsigned int maxinstances; unsigned int outsize; unsigned int insize; unsigned int timeout; unsigned int instances; struct list servers; /* list of servers using this pipe */ struct list waiters; /* list of clients waiting to connect */ }; struct named_pipe_device { struct object obj; /* object header */ struct fd *fd; /* pseudo-fd for ioctls */ struct namespace *pipes; /* named pipe namespace */ }; static void named_pipe_dump( struct object *obj, int verbose ); static unsigned int named_pipe_map_access( struct object *obj, unsigned int access ); static void named_pipe_destroy( struct object *obj ); static const struct object_ops named_pipe_ops = { sizeof(struct named_pipe), /* size */ named_pipe_dump, /* dump */ no_add_queue, /* add_queue */ NULL, /* remove_queue */ NULL, /* signaled */ NULL, /* satisfied */ no_signal, /* signal */ no_get_fd, /* get_fd */ named_pipe_map_access, /* map_access */ no_lookup_name, /* lookup_name */ no_open_file, /* open_file */ no_close_handle, /* close_handle */ named_pipe_destroy /* destroy */ }; /* functions common to server and client */ static unsigned int pipe_map_access( struct object *obj, unsigned int access ); /* server end functions */ static void pipe_server_dump( struct object *obj, int verbose ); static struct fd *pipe_server_get_fd( struct object *obj ); static void pipe_server_destroy( struct object *obj); static int pipe_server_flush( struct fd *fd, struct event **event ); static enum server_fd_type pipe_server_get_info( struct fd *fd, int *flags ); static const struct object_ops pipe_server_ops = { sizeof(struct pipe_server), /* size */ pipe_server_dump, /* dump */ default_fd_add_queue, /* add_queue */ default_fd_remove_queue, /* remove_queue */ default_fd_signaled, /* signaled */ no_satisfied, /* satisfied */ no_signal, /* signal */ pipe_server_get_fd, /* get_fd */ pipe_map_access, /* map_access */ no_lookup_name, /* lookup_name */ no_open_file, /* open_file */ fd_close_handle, /* close_handle */ pipe_server_destroy /* destroy */ }; static const struct fd_ops pipe_server_fd_ops = { default_fd_get_poll_events, /* get_poll_events */ default_poll_event, /* poll_event */ pipe_server_flush, /* flush */ pipe_server_get_info, /* get_file_info */ default_fd_queue_async, /* queue_async */ default_fd_cancel_async, /* cancel_async */ }; /* client end functions */ static void pipe_client_dump( struct object *obj, int verbose ); static struct fd *pipe_client_get_fd( struct object *obj ); static void pipe_client_destroy( struct object *obj ); static int pipe_client_flush( struct fd *fd, struct event **event ); static enum server_fd_type pipe_client_get_info( struct fd *fd, int *flags ); static const struct object_ops pipe_client_ops = { sizeof(struct pipe_client), /* size */ pipe_client_dump, /* dump */ default_fd_add_queue, /* add_queue */ default_fd_remove_queue, /* remove_queue */ default_fd_signaled, /* signaled */ no_satisfied, /* satisfied */ no_signal, /* signal */ pipe_client_get_fd, /* get_fd */ pipe_map_access, /* map_access */ no_lookup_name, /* lookup_name */ no_open_file, /* open_file */ fd_close_handle, /* close_handle */ pipe_client_destroy /* destroy */ }; static const struct fd_ops pipe_client_fd_ops = { default_fd_get_poll_events, /* get_poll_events */ default_poll_event, /* poll_event */ pipe_client_flush, /* flush */ pipe_client_get_info, /* get_file_info */ default_fd_queue_async, /* queue_async */ default_fd_cancel_async /* cancel_async */ }; static void named_pipe_device_dump( struct object *obj, int verbose ); static struct fd *named_pipe_device_get_fd( struct object *obj ); static struct object *named_pipe_device_lookup_name( struct object *obj, struct unicode_str *name, unsigned int attr ); static void named_pipe_device_destroy( struct object *obj ); static enum server_fd_type named_pipe_device_get_file_info( struct fd *fd, int *flags ); static const struct object_ops named_pipe_device_ops = { sizeof(struct named_pipe_device), /* size */ named_pipe_device_dump, /* dump */ no_add_queue, /* add_queue */ NULL, /* remove_queue */ NULL, /* signaled */ no_satisfied, /* satisfied */ no_signal, /* signal */ named_pipe_device_get_fd, /* get_fd */ pipe_map_access, /* map_access */ named_pipe_device_lookup_name, /* lookup_name */ no_open_file, /* open_file */ fd_close_handle, /* close_handle */ named_pipe_device_destroy /* destroy */ }; static const struct fd_ops named_pipe_device_fd_ops = { default_fd_get_poll_events, /* get_poll_events */ default_poll_event, /* poll_event */ no_flush, /* flush */ named_pipe_device_get_file_info, /* get_file_info */ default_fd_queue_async, /* queue_async */ default_fd_cancel_async /* cancel_async */ }; static void named_pipe_dump( struct object *obj, int verbose ) { struct named_pipe *pipe = (struct named_pipe *) obj; assert( obj->ops == &named_pipe_ops ); fprintf( stderr, "Named pipe " ); dump_object_name( &pipe->obj ); fprintf( stderr, "\n" ); } static unsigned int named_pipe_map_access( struct object *obj, unsigned int access ) { if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ; if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE | FILE_CREATE_PIPE_INSTANCE; if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE; if (access & GENERIC_ALL) access |= STANDARD_RIGHTS_ALL; return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL); } static void pipe_server_dump( struct object *obj, int verbose ) { struct pipe_server *server = (struct pipe_server *) obj; assert( obj->ops == &pipe_server_ops ); fprintf( stderr, "Named pipe server pipe=%p state=%d\n", server->pipe, server->state ); } static void pipe_client_dump( struct object *obj, int verbose ) { struct pipe_client *client = (struct pipe_client *) obj; assert( obj->ops == &pipe_client_ops ); fprintf( stderr, "Named pipe client server=%p\n", client->server ); } static void named_pipe_destroy( struct object *obj) { struct named_pipe *pipe = (struct named_pipe *) obj; assert( list_empty( &pipe->servers ) ); assert( !pipe->instances ); async_terminate_queue( &pipe->waiters, STATUS_HANDLES_CLOSED ); } static struct fd *pipe_client_get_fd( struct object *obj ) { struct pipe_client *client = (struct pipe_client *) obj; if (client->fd) return (struct fd *) grab_object( client->fd ); set_error( STATUS_PIPE_DISCONNECTED ); return NULL; } static struct fd *pipe_server_get_fd( struct object *obj ) { struct pipe_server *server = (struct pipe_server *) obj; switch(server->state) { case ps_connected_server: case ps_wait_disconnect: assert( server->fd ); return (struct fd *) grab_object( server->fd ); case ps_wait_open: case ps_idle_server: set_error( STATUS_PIPE_LISTENING ); break; case ps_disconnected_server: case ps_wait_connect: set_error( STATUS_PIPE_DISCONNECTED ); break; } return NULL; } static void notify_empty( struct pipe_server *server ) { if (!server->flush_poll) return; assert( server->state == ps_connected_server ); assert( server->event ); remove_timeout_user( server->flush_poll ); server->flush_poll = NULL; set_event( server->event ); release_object( server->event ); server->event = NULL; } static void do_disconnect( struct pipe_server *server ) { /* we may only have a server fd, if the client disconnected */ if (server->client) { assert( server->client->server == server ); assert( server->client->fd ); release_object( server->client->fd ); server->client->fd = NULL; } assert( server->fd ); release_object( server->fd ); server->fd = NULL; } static unsigned int pipe_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 void pipe_server_destroy( struct object *obj) { struct pipe_server *server = (struct pipe_server *)obj; assert( obj->ops == &pipe_server_ops ); if (server->fd) { notify_empty( server ); do_disconnect( server ); } if (server->client) { server->client->server = NULL; server->client = NULL; } async_terminate_head( &server->wait_q, STATUS_HANDLES_CLOSED ); assert( server->pipe->instances ); server->pipe->instances--; list_remove( &server->entry ); release_object( server->pipe ); } static void pipe_client_destroy( struct object *obj) { struct pipe_client *client = (struct pipe_client *)obj; struct pipe_server *server = client->server; assert( obj->ops == &pipe_client_ops ); if (server) { notify_empty( server ); switch(server->state) { case ps_connected_server: /* Don't destroy the server's fd here as we can't do a successful flush without it. */ server->state = ps_wait_disconnect; release_object( client->fd ); client->fd = NULL; break; case ps_disconnected_server: server->state = ps_wait_connect; break; case ps_idle_server: case ps_wait_open: case ps_wait_disconnect: case ps_wait_connect: assert( 0 ); } assert( server->client ); server->client = NULL; client->server = NULL; } assert( !client->fd ); } static void named_pipe_device_dump( struct object *obj, int verbose ) { assert( obj->ops == &named_pipe_device_ops ); fprintf( stderr, "Named pipe device\n" ); } static struct fd *named_pipe_device_get_fd( struct object *obj ) { struct named_pipe_device *device = (struct named_pipe_device *)obj; return (struct fd *)grab_object( device->fd ); } static struct object *named_pipe_device_lookup_name( struct object *obj, struct unicode_str *name, unsigned int attr ) { struct named_pipe_device *device = (struct named_pipe_device*)obj; struct object *found; assert( obj->ops == &named_pipe_device_ops ); assert( device->pipes ); if ((found = find_object( device->pipes, name, attr | OBJ_CASE_INSENSITIVE ))) name->len = 0; return found; } static void named_pipe_device_destroy( struct object *obj ) { struct named_pipe_device *device = (struct named_pipe_device*)obj; assert( obj->ops == &named_pipe_device_ops ); if (device->fd) release_object( device->fd ); free( device->pipes ); } static enum server_fd_type named_pipe_device_get_file_info( struct fd *fd, int *flags ) { *flags = 0; return FD_TYPE_DEVICE; } void create_named_pipe_device( struct directory *root, const struct unicode_str *name ) { struct named_pipe_device *dev; if ((dev = create_named_object_dir( root, name, 0, &named_pipe_device_ops )) && get_error() != STATUS_OBJECT_NAME_EXISTS) { dev->pipes = NULL; if (!(dev->fd = alloc_pseudo_fd( &named_pipe_device_fd_ops, &dev->obj )) || !(dev->pipes = create_namespace( 7 ))) { release_object( dev ); dev = NULL; } } if (dev) make_object_static( &dev->obj ); } static int pipe_data_remaining( struct pipe_server *server ) { struct pollfd pfd; int fd; assert( server->client ); fd = get_unix_fd( server->client->fd ); if (fd < 0) return 0; pfd.fd = fd; pfd.events = POLLIN; pfd.revents = 0; if (0 > poll( &pfd, 1, 0 )) return 0; return pfd.revents&POLLIN; } static void check_flushed( void *arg ) { struct pipe_server *server = (struct pipe_server*) arg; assert( server->event ); if (pipe_data_remaining( server )) { struct timeval tv = current_time; add_timeout( &tv, 100 ); server->flush_poll = add_timeout_user( &tv, check_flushed, server ); } else { /* notify_empty( server ); */ server->flush_poll = NULL; set_event( server->event ); release_object( server->event ); server->event = NULL; } } static int pipe_server_flush( struct fd *fd, struct event **event ) { struct pipe_server *server = get_fd_user( fd ); if (!server) return 0; if (server->state != ps_connected_server) return 0; /* FIXME: if multiple threads flush the same pipe, maybe should create a list of processes to notify */ if (server->flush_poll) return 0; if (pipe_data_remaining( server )) { struct timeval tv = current_time; /* this kind of sux - there's no unix way to be alerted when a pipe becomes empty */ server->event = create_event( NULL, NULL, 0, 0, 0 ); if (!server->event) return 0; add_timeout( &tv, 100 ); server->flush_poll = add_timeout_user( &tv, check_flushed, server ); *event = server->event; } return 0; } static int pipe_client_flush( struct fd *fd, struct event **event ) { /* FIXME: what do we have to do for this? */ return 0; } static inline int is_overlapped( unsigned int options ) { return !(options & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT)); } static enum server_fd_type pipe_server_get_info( struct fd *fd, int *flags ) { struct pipe_server *server = get_fd_user( fd ); *flags = FD_FLAG_AVAILABLE; if (is_overlapped( server->options )) *flags |= FD_FLAG_OVERLAPPED; return FD_TYPE_PIPE; } static enum server_fd_type pipe_client_get_info( struct fd *fd, int *flags ) { struct pipe_client *client = get_fd_user( fd ); *flags = FD_FLAG_AVAILABLE; if (is_overlapped( client->flags )) *flags |= FD_FLAG_OVERLAPPED; return FD_TYPE_PIPE; } static struct named_pipe *create_named_pipe( struct directory *root, const struct unicode_str *name, unsigned int attr ) { struct object *obj; struct named_pipe *pipe = NULL; struct unicode_str new_name; if (!name || !name->len) return alloc_object( &named_pipe_ops ); if (!(obj = find_object_dir( root, name, attr, &new_name ))) return NULL; if (!new_name.len) { if (attr & OBJ_OPENIF && obj->ops == &named_pipe_ops) set_error( STATUS_OBJECT_NAME_EXISTS ); else { release_object( obj ); obj = NULL; if (attr & OBJ_OPENIF) set_error( STATUS_OBJECT_TYPE_MISMATCH ); else set_error( STATUS_OBJECT_NAME_COLLISION ); } return (struct named_pipe *)obj; } if (obj->ops != &named_pipe_device_ops) set_error( STATUS_OBJECT_TYPE_MISMATCH ); else { struct named_pipe_device *dev = (struct named_pipe_device *)obj; if ((pipe = create_object( dev->pipes, &named_pipe_ops, &new_name, NULL ))) clear_error(); } release_object( obj ); return pipe; } static struct pipe_server *get_pipe_server_obj( struct process *process, obj_handle_t handle, unsigned int access ) { struct object *obj; obj = get_handle_obj( process, handle, access, &pipe_server_ops ); return (struct pipe_server *) obj; } static struct pipe_server *create_pipe_server( struct named_pipe *pipe, unsigned int options ) { struct pipe_server *server; server = alloc_object( &pipe_server_ops ); if (!server) return NULL; server->fd = NULL; server->pipe = pipe; server->state = ps_idle_server; server->client = NULL; server->flush_poll = NULL; server->options = options; list_init( &server->wait_q ); list_add_head( &pipe->servers, &server->entry ); grab_object( pipe ); return server; } static struct pipe_client *create_pipe_client( unsigned int flags ) { struct pipe_client *client; client = alloc_object( &pipe_client_ops ); if (!client) return NULL; client->fd = NULL; client->server = NULL; client->flags = flags; return client; } static inline struct pipe_server *find_server( struct named_pipe *pipe, enum pipe_state state ) { struct pipe_server *server; LIST_FOR_EACH_ENTRY( server, &pipe->servers, struct pipe_server, entry ) { if (server->state == state) return (struct pipe_server *)grab_object( server ); } return NULL; } static inline struct pipe_server *find_server2( struct named_pipe *pipe, enum pipe_state state1, enum pipe_state state2 ) { struct pipe_server *server; LIST_FOR_EACH_ENTRY( server, &pipe->servers, struct pipe_server, entry ) { if (server->state == state1 || server->state == state2) return (struct pipe_server *)grab_object( server ); } return NULL; } DECL_HANDLER(create_named_pipe) { struct named_pipe *pipe; struct pipe_server *server; struct unicode_str name; struct directory *root = NULL; reply->handle = 0; get_req_unicode_str( &name ); if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 ))) return; pipe = create_named_pipe( root, &name, req->attributes | OBJ_OPENIF ); if (root) release_object( root ); if (!pipe) return; if (get_error() != STATUS_OBJECT_NAME_EXISTS) { /* initialize it if it didn't already exist */ pipe->instances = 0; list_init( &pipe->servers ); list_init( &pipe->waiters ); pipe->insize = req->insize; pipe->outsize = req->outsize; pipe->maxinstances = req->maxinstances; pipe->timeout = req->timeout; pipe->flags = req->flags; } else { if (pipe->maxinstances <= pipe->instances) { set_error( STATUS_INSTANCE_NOT_AVAILABLE ); release_object( pipe ); return; } if ((pipe->maxinstances != req->maxinstances) || (pipe->timeout != req->timeout) || (pipe->flags != req->flags)) { set_error( STATUS_ACCESS_DENIED ); release_object( pipe ); return; } clear_error(); /* clear the name collision */ } server = create_pipe_server( pipe, req->options ); if (server) { reply->handle = alloc_handle( current->process, server, req->access, req->attributes ); server->pipe->instances++; release_object( server ); } release_object( pipe ); } DECL_HANDLER(open_named_pipe) { struct pipe_server *server; struct pipe_client *client; struct unicode_str name; struct directory *root = NULL; struct named_pipe *pipe; int fds[2]; get_req_unicode_str( &name ); if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 ))) return; pipe = open_object_dir( root, &name, req->attributes, &named_pipe_ops ); if (root) release_object( root ); if (!pipe) return; server = find_server2( pipe, ps_idle_server, ps_wait_open ); release_object( pipe ); if (!server) { set_error( STATUS_PIPE_NOT_AVAILABLE ); return; } client = create_pipe_client( req->flags ); if (client) { if (!socketpair( PF_UNIX, SOCK_STREAM, 0, fds )) { int res = 0; assert( !client->fd ); assert( !server->fd ); /* for performance reasons, only set nonblocking mode when using * overlapped I/O. Otherwise, we will be doing too much busy * looping */ if (is_overlapped( req->flags )) res = fcntl( fds[1], F_SETFL, O_NONBLOCK ); if ((res != -1) && is_overlapped( server->options )) res = fcntl( fds[0], F_SETFL, O_NONBLOCK ); if (pipe->insize) { setsockopt( fds[0], SOL_SOCKET, SO_RCVBUF, &pipe->insize, sizeof(pipe->insize) ); setsockopt( fds[1], SOL_SOCKET, SO_RCVBUF, &pipe->insize, sizeof(pipe->insize) ); } if (pipe->outsize) { setsockopt( fds[0], SOL_SOCKET, SO_SNDBUF, &pipe->outsize, sizeof(pipe->outsize) ); setsockopt( fds[1], SOL_SOCKET, SO_SNDBUF, &pipe->outsize, sizeof(pipe->outsize) ); } client->fd = create_anonymous_fd( &pipe_client_fd_ops, fds[1], &client->obj ); server->fd = create_anonymous_fd( &pipe_server_fd_ops, fds[0], &server->obj ); if (client->fd && server->fd && res != 1) { if (server->state == ps_wait_open) async_terminate_head( &server->wait_q, STATUS_SUCCESS ); assert( list_empty( &server->wait_q ) ); server->state = ps_connected_server; server->client = client; client->server = server; reply->handle = alloc_handle( current->process, client, req->access, req->attributes ); } } else file_set_error(); release_object( client ); } release_object( server ); } DECL_HANDLER(connect_named_pipe) { struct pipe_server *server; server = get_pipe_server_obj(current->process, req->handle, 0); if (!server) return; switch(server->state) { case ps_idle_server: case ps_wait_connect: assert( !server->fd ); server->state = ps_wait_open; create_async( current, NULL, &server->wait_q, &req->async ); async_terminate_queue( &server->pipe->waiters, STATUS_SUCCESS ); set_error( STATUS_PENDING ); break; case ps_connected_server: assert( server->fd ); set_error( STATUS_PIPE_CONNECTED ); break; case ps_disconnected_server: set_error( STATUS_PIPE_BUSY ); break; case ps_wait_disconnect: set_error( STATUS_NO_DATA_DETECTED ); break; case ps_wait_open: set_error( STATUS_INVALID_HANDLE ); break; } release_object(server); } DECL_HANDLER(wait_named_pipe) { struct named_pipe_device *device; struct named_pipe *pipe; struct pipe_server *server; struct unicode_str name; device = (struct named_pipe_device *)get_handle_obj( current->process, req->handle, FILE_READ_ATTRIBUTES, &named_pipe_device_ops ); if (!device) return; get_req_unicode_str( &name ); pipe = (struct named_pipe *)find_object( device->pipes, &name, OBJ_CASE_INSENSITIVE ); release_object( device ); if (!pipe) { set_error( STATUS_PIPE_NOT_AVAILABLE ); return; } server = find_server( pipe, ps_wait_open ); if (!server) { if (req->timeout == NMPWAIT_WAIT_FOREVER) { if (create_async( current, NULL, &pipe->waiters, &req->async )) set_error( STATUS_PENDING ); } else { struct timeval when = current_time; if (req->timeout == NMPWAIT_USE_DEFAULT_WAIT) add_timeout( &when, pipe->timeout ); else add_timeout( &when, req->timeout ); if (create_async( current, &when, &pipe->waiters, &req->async )) set_error( STATUS_PENDING ); } } else release_object( server ); release_object( pipe ); } DECL_HANDLER(disconnect_named_pipe) { struct pipe_server *server; server = get_pipe_server_obj( current->process, req->handle, 0 ); if (!server) return; switch(server->state) { case ps_connected_server: assert( server->fd ); assert( server->client ); assert( server->client->fd ); notify_empty( server ); /* Dump the client and server fds, but keep the pointers around - client loses all waiting data */ server->state = ps_disconnected_server; do_disconnect( server ); break; case ps_wait_disconnect: assert( !server->client ); assert( server->fd ); do_disconnect( server ); server->state = ps_wait_connect; break; case ps_idle_server: case ps_wait_open: case ps_disconnected_server: case ps_wait_connect: set_error( STATUS_PIPE_DISCONNECTED ); break; } release_object( server ); } DECL_HANDLER(get_named_pipe_info) { struct pipe_server *server; struct pipe_client *client = NULL; server = get_pipe_server_obj( current->process, req->handle, FILE_READ_ATTRIBUTES ); if (!server) { clear_error(); client = (struct pipe_client *)get_handle_obj( current->process, req->handle, FILE_READ_ATTRIBUTES, &pipe_client_ops ); if (!client) return; server = client->server; } reply->flags = server->pipe->flags; reply->maxinstances = server->pipe->maxinstances; reply->instances = server->pipe->instances; reply->insize = server->pipe->insize; reply->outsize = server->pipe->outsize; if (client) release_object(client); else { reply->flags |= NAMED_PIPE_SERVER_END; release_object(server); } }