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authorMichael Roth <mdroth@linux.vnet.ibm.com>2012-02-07 13:56:48 -0600
committerMichael Roth <mdroth@linux.vnet.ibm.com>2012-03-12 15:09:23 -0500
commit3cf0bed8369267184e5dc5b58882811519d67437 (patch)
treea9c32d61d08ec7ab795b1b2cc4d74252087e1130 /audio/audio.h
parent3424fc9f16a1e7d1c48eb6d605eb0ca63e199ec2 (diff)
qemu-ga: add guest-sync-delimited
guest-sync leaves it as an exercise to the user as to how to reliably obtain the response to guest-sync if the client had previously read in a partial response (due qemu-ga previously being restarted mid-"sentence" due to reboot, forced restart, etc). qemu-ga handles this situation on its end by having a client precede their guest-sync request with a 0xFF byte (invalid UTF-8), which qemu-ga/QEMU JSON parsers will treat as a flush event. Thus we can reliably flush the qemu-ga parser state in preparation for receiving the guest-sync request. guest-sync-delimited provides the same functionality for a client: when a guest-sync-delimited is issued, qemu-ga will precede it's response with a 0xFF byte that the client can use as an indicator to flush its buffer/parser state in preparation for reliably receiving the guest-sync-delimited response. It is also useful as an optimization for clients, since, after issuing a guest-sync-delimited, clients can safely discard all stale data read from the channel until the 0xFF is found. More information available on the wiki: http://wiki.qemu.org/Features/QAPI/GuestAgent#QEMU_Guest_Agent_Protocol Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Diffstat (limited to 'audio/audio.h')
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