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rpcrt4: Reimplement rpcrt4_conn_np_wait_for_incoming_data() using asynchronous read with zero sized buffer. 

The problem with NtFsControlFile(FSCTL_PIPE_PEEK) is that it happily returns
STATUS_SUCCESS with 0 bytes of data available. That makes the client think
that the server already sent a reply and try to read the reply data, which
hangs. A solution to this is call NtReadFile() with zero sized buffer, which
has correct behaviour: just waits for incoming data to appear without mangling
the data in the pipe.

Signed-off-by: Dmitry Timoshkov <dmitry@baikal.ru>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Dmitry Timoshkov 2019-09-25 15:25:20 +08:00 committed by Alexandre Julliard
parent 86d1a24e44
commit a6fe4f6e65
1 changed files with 1 additions and 25 deletions
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26
dlls/rpcrt4/rpc_transport.c
View File

@ -465,31 +465,7 @@ static void rpcrt4_conn_np_cancel_call(RpcConnection *conn)
static int rpcrt4_conn_np_wait_for_incoming_data(RpcConnection *conn)
{
RpcConnection_np *connection = (RpcConnection_np *)conn;
FILE_PIPE_PEEK_BUFFER buf;
HANDLE event;
NTSTATUS status;
int ret;
event = get_np_event(connection);
if (!event) return -1;
status = NtFsControlFile(connection->pipe, event, NULL, NULL, &connection->io_status, FSCTL_PIPE_PEEK, NULL, 0, &buf, sizeof(buf));
if (status == STATUS_SUCCESS)
ret = 0;
else if (status == STATUS_PENDING)
{
WaitForSingleObject(event, INFINITE);
ret = 0;
}
else
{
WARN("NtFsControlFile error %08x\n", status);
ret = -1;
}
release_np_event(connection, event);
return ret;
return rpcrt4_conn_np_read(conn, NULL, 0);
}
static size_t rpcrt4_ncacn_np_get_top_of_tower(unsigned char *tower_data,