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Re: [libvirt] [PATCH] qemu: Use QMP for send-key if supported

On 04/11/13 15:00, Eric Blake wrote:
On 04/11/2013 06:45 AM, Peter Krempa wrote:
Instead of always using HMP use the QMP send-key command introduced in qemu 1.3.

+++ b/src/qemu/qemu_monitor.c
@@ -3008,14 +3008,15 @@ int qemuMonitorInjectNMI(qemuMonitorPtr mon)
  int qemuMonitorSendKey(qemuMonitorPtr mon,
                         unsigned int holdtime,
                         unsigned int *keycodes,
-                       unsigned int nkeycodes)
+                       unsigned int nkeycodes,
+                       bool useQMP)
      int ret;

      VIR_DEBUG("mon=%p, holdtime=%u, nkeycodes=%u",
                mon, holdtime, nkeycodes);

-    if (mon->json)
+    if (mon->json && useQMP)
          ret = qemuMonitorJSONSendKey(mon, holdtime, keycodes, nkeycodes);
          ret = qemuMonitorTextSendKey(mon, holdtime, keycodes, nkeycodes);

I'm not sure I like adding the useQMP parameter.  That makes for a leaky
abstraction (the caller is burdened with telling us which version of a
polymorphic function to dispatch to).  What we have done in other cases
is to always dispatch to the json code, and then have the json code
_try_ the command, and if the command fails, fall back to the hmp

I saw that approach and I didn't like it thus I created this.

command.  See for example qemuMonitorJSONInjectNMI.  And if you do it
that way, you don't even need a qemu_capabilities bit, and the caller no
longer has to care about which version of monitor it is talking to.


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