[Xen-devel] [PATCH v4 08/16] tools/libvchan: notify server when client is connected - Marek Marczykowski-Górecki

From: "Marek Marczykowski-Górecki" <marmarek@invisiblethingslab.com>
To: xen-devel@lists.xenproject.org
Cc: "Ian Jackson" <ian.jackson@eu.citrix.com>,
	"Marek Marczykowski-Górecki" <marmarek@invisiblethingslab.com>,
	"Wei Liu" <wl@xen.org>
Subject: [Xen-devel] [PATCH v4 08/16] tools/libvchan: notify server when client is connected
Date: Wed, 15 Jan 2020 03:39:47 +0100	[thread overview]
Message-ID: <047e5ff567ac0c2e0bd92fd8741c03d07b548ab5.1579055705.git-series.marmarek@invisiblethingslab.com> (raw)
In-Reply-To: <cover.f819645cd9f5cf7a6f692f9661cfb4e670a2cd08.1579055705.git-series.marmarek@invisiblethingslab.com>

Let the server know when the client is connected. Otherwise server will
notice only when client send some data.
This change does not break existing clients, as libvchan user should
handle spurious notifications anyway (for example acknowledge of remote
side reading the data).

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
---
I had this patch in Qubes for a long time and totally forgot it wasn't
upstream thing...
---
 tools/libvchan/init.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/libvchan/init.c b/tools/libvchan/init.c
index 180833d..50a64c1 100644
--- a/tools/libvchan/init.c
+++ b/tools/libvchan/init.c
@@ -447,6 +447,9 @@ struct libxenvchan *libxenvchan_client_init(struct xentoollog_logger *logger,
 	ctrl->ring->cli_live = 1;
 	ctrl->ring->srv_notify = VCHAN_NOTIFY_WRITE;
 
+    /* wake up the server */
+    xenevtchn_notify(ctrl->event, ctrl->event_port);
+
  out:
 	if (xs)
 		xs_daemon_close(xs);
-- 
git-series 0.9.1

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