[v7,09/19] tools/libvchan: notify server when client is connected
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Message ID 20200519015503.115236-10-jandryuk@gmail.com
State New
Headers show
Series
  • Add support for qemu-xen runnning in a Linux-based stubdomain
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Commit Message

Jason Andryuk May 19, 2020, 1:54 a.m. UTC
From: Marek Marczykowski-Górecki <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).

Cc: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Replace spaces with tabs to match the file's whitespace.
Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
---
Marek: I had this patch in Qubes for a long time and totally forgot it
wasn't upstream thing...

Changes in v6:
 - Add Acked-by: Ian Jackson
 - CC Daniel De Graaf
---
 tools/libvchan/init.c | 3 +++
 1 file changed, 3 insertions(+)

Patch
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diff --git a/tools/libvchan/init.c b/tools/libvchan/init.c
index 180833dc2f..ad4b64fbe3 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);