server: Add RedClient

That means RedClient tracks a ring of channels. Right now there will be only
a single client because of the disconnection mechanism - whenever a new
client comes we disconnect all existing clients. But this patch adds already
a ring of clients to reds.c (stored in RedServer).

There is a known problem handling many connections and disconnections at the
same time, trigerrable easily by the following script:

export NEW_DISPLAY=:3.0

Xephyr $NEW_DISPLAY -noreset &
for ((i = 0 ; i < 5; ++i)); do
    for ((j = 0 ; j < 10; ++j)); do
        DISPLAY=$NEW_DISPLAY c_win7x86_qxl_tests &
    done
    sleep 2;
done

I fixed a few of the problems resulting from this in the same patch. This
required already introducing a few other changes:
 * make sure all removal of channels happens in the main thread, for that
 two additional dispatcher calls are added to remove a specific channel
 client (RED_WORKER_MESSAGE_CURSOR_DISCONNECT_CLIENT and
 RED_WORKER_MESSAGE_DISPLAY_DISCONNECT_CLIENT).
 * change some asserts in input channel.
 * make main channel disconnect not recursive
 * introduce disconnect call back to red_channel_create_parser

The remaining abort is from a double free in the main channel, still can't
find it (doesn't happen when running under valgrind - probably due to the
slowness resulting from that), but is easy to see when running under gdb.

1 files changed, 2 insertions, 2 deletions

diff --git a/server/smartcard.c b/server/smartcard.c
index eda73fe2..76ae6061 100644
--- a/server/smartcard.c
+++ b/server/smartcard.c
@@ -477,7 +477,7 @@ static void smartcard_channel_hold_pipe_item(RedChannelClient *rcc, PipeItem *it
 {
 }
 
-static void smartcard_link(Channel *channel, RedsStream *stream,
+static void smartcard_link(Channel *channel, RedClient *client, RedsStream *stream,
                         int migration, int num_common_caps,
                         uint32_t *common_caps, int num_caps,
                         uint32_t *caps)
@@ -506,7 +506,7 @@ static void smartcard_link(Channel *channel, RedsStream *stream,
         red_printf("ERROR: smartcard channel creation failed");
         return;
     }
-    red_channel_client_create(sizeof(RedChannelClient), channel->data, stream);
+    red_channel_client_create(sizeof(RedChannelClient), channel->data, client, stream);
     red_channel_init_outgoing_messages_window((RedChannel*)channel->data);
 }