qapi/char.json - qemu - Git at Google

 # -*- Mode: Python -*-
 #

 ##
 # = Character devices
 ##

 { 'include': 'sockets.json' }

 ##
 # @ChardevInfo:
 #
 # Information about a character device.
 #
 # @label: the label of the character device
 #
 # @filename: the filename of the character device
 #
 # @frontend-open: shows whether the frontend device attached to this backend
 #                 (eg. with the chardev=... option) is in open or closed state
 #                 (since 2.1)
 #
 # Notes: @filename is encoded using the QEMU command line character device
 #        encoding.  See the QEMU man page for details.
 #
 # Since: 0.14.0
 ##
 { 'struct': 'ChardevInfo', 'data': {'label': 'str',
                                   'filename': 'str',
                                   'frontend-open': 'bool'} }

 ##
 # @query-chardev:
 #
 # Returns information about current character devices.
 #
 # Returns: a list of @ChardevInfo
 #
 # Since: 0.14.0
 #
 # Example:
 #
 # -> { "execute": "query-chardev" }
 # <- {
 #       "return": [
 #          {
 #             "label": "charchannel0",
 #             "filename": "unix:/var/lib/libvirt/qemu/seabios.rhel6.agent,server",
 #             "frontend-open": false
 #          },
 #          {
 #             "label": "charmonitor",
 #             "filename": "unix:/var/lib/libvirt/qemu/seabios.rhel6.monitor,server",
 #             "frontend-open": true
 #          },
 #          {
 #             "label": "charserial0",
 #             "filename": "pty:/dev/pts/2",
 #             "frontend-open": true
 #          }
 #       ]
 #    }
 #
 ##
 { 'command': 'query-chardev', 'returns': ['ChardevInfo'],
   'allow-preconfig': true }

 ##
 # @ChardevBackendInfo:
 #
 # Information about a character device backend
 #
 # @name: The backend name
 #
 # Since: 2.0
 ##
 { 'struct': 'ChardevBackendInfo', 'data': {'name': 'str'} }

 ##
 # @query-chardev-backends:
 #
 # Returns information about character device backends.
 #
 # Returns: a list of @ChardevBackendInfo
 #
 # Since: 2.0
 #
 # Example:
 #
 # -> { "execute": "query-chardev-backends" }
 # <- {
 #       "return":[
 #          {
 #             "name":"udp"
 #          },
 #          {
 #             "name":"tcp"
 #          },
 #          {
 #             "name":"unix"
 #          },
 #          {
 #             "name":"spiceport"
 #          }
 #       ]
 #    }
 #
 ##
 { 'command': 'query-chardev-backends', 'returns': ['ChardevBackendInfo'] }

 ##
 # @DataFormat:
 #
 # An enumeration of data format.
 #
 # @utf8: Data is a UTF-8 string (RFC 3629)
 #
 # @base64: Data is Base64 encoded binary (RFC 3548)
 #
 # Since: 1.4
 ##
 { 'enum': 'DataFormat',
   'data': [ 'utf8', 'base64' ] }

 ##
 # @ringbuf-write:
 #
 # Write to a ring buffer character device.
 #
 # @device: the ring buffer character device name
 #
 # @data: data to write
 #
 # @format: data encoding (default 'utf8').
 #          - base64: data must be base64 encoded text.  Its binary
 #            decoding gets written.
 #          - utf8: data's UTF-8 encoding is written
 #          - data itself is always Unicode regardless of format, like
 #            any other string.
 #
 # Returns: Nothing on success
 #
 # Since: 1.4
 #
 # Example:
 #
 # -> { "execute": "ringbuf-write",
 #      "arguments": { "device": "foo",
 #                     "data": "abcdefgh",
 #                     "format": "utf8" } }
 # <- { "return": {} }
 #
 ##
 { 'command': 'ringbuf-write',
   'data': {'device': 'str', 'data': 'str',
            '*format': 'DataFormat'} }

 ##
 # @ringbuf-read:
 #
 # Read from a ring buffer character device.
 #
 # @device: the ring buffer character device name
 #
 # @size: how many bytes to read at most
 #
 # @format: data encoding (default 'utf8').
 #          - base64: the data read is returned in base64 encoding.
 #          - utf8: the data read is interpreted as UTF-8.
 #            Bug: can screw up when the buffer contains invalid UTF-8
 #            sequences, NUL characters, after the ring buffer lost
 #            data, and when reading stops because the size limit is
 #            reached.
 #          - The return value is always Unicode regardless of format,
 #            like any other string.
 #
 # Returns: data read from the device
 #
 # Since: 1.4
 #
 # Example:
 #
 # -> { "execute": "ringbuf-read",
 #      "arguments": { "device": "foo",
 #                     "size": 1000,
 #                     "format": "utf8" } }
 # <- { "return": "abcdefgh" }
 #
 ##
 { 'command': 'ringbuf-read',
   'data': {'device': 'str', 'size': 'int', '*format': 'DataFormat'},
   'returns': 'str' }

 ##
 # @ChardevCommon:
 #
 # Configuration shared across all chardev backends
 #
 # @logfile: The name of a logfile to save output
 # @logappend: true to append instead of truncate
 #             (default to false to truncate)
 #
 # Since: 2.6
 ##
 { 'struct': 'ChardevCommon', 'data': { '*logfile': 'str',
                                        '*logappend': 'bool' } }

 ##
 # @ChardevFile:
 #
 # Configuration info for file chardevs.
 #
 # @in:  The name of the input file
 # @out: The name of the output file
 # @append: Open the file in append mode (default false to
 #          truncate) (Since 2.6)
 #
 # Since: 1.4
 ##
 { 'struct': 'ChardevFile', 'data': { '*in' : 'str',
                                    'out' : 'str',
                                    '*append': 'bool' },
   'base': 'ChardevCommon' }

 ##
 # @ChardevHostdev:
 #
 # Configuration info for device and pipe chardevs.
 #
 # @device: The name of the special file for the device,
 #          i.e. /dev/ttyS0 on Unix or COM1: on Windows
 #
 # Since: 1.4
 ##
 { 'struct': 'ChardevHostdev', 'data': { 'device' : 'str' },
   'base': 'ChardevCommon' }

 ##
 # @ChardevSocket:
 #
 # Configuration info for (stream) socket chardevs.
 #
 # @addr: socket address to listen on (server=true)
 #        or connect to (server=false)
 # @tls-creds: the ID of the TLS credentials object (since 2.6)
 # @server: create server socket (default: true)
 # @wait: wait for incoming connection on server
 #        sockets (default: false).
 # @nodelay: set TCP_NODELAY socket option (default: false)
 # @telnet: enable telnet protocol on server
 #          sockets (default: false)
 # @tn3270: enable tn3270 protocol on server
 #          sockets (default: false) (Since: 2.10)
 # @reconnect: For a client socket, if a socket is disconnected,
 #          then attempt a reconnect after the given number of seconds.
 #          Setting this to zero disables this function. (default: 0)
 #          (Since: 2.2)
 #
 # Since: 1.4
 ##
 { 'struct': 'ChardevSocket', 'data': { 'addr'       : 'SocketAddressLegacy',
                                      '*tls-creds'  : 'str',
                                      '*server'    : 'bool',
                                      '*wait'      : 'bool',
                                      '*nodelay'   : 'bool',
                                      '*telnet'    : 'bool',
                                      '*tn3270'    : 'bool',
                                      '*reconnect' : 'int' },
   'base': 'ChardevCommon' }

 ##
 # @ChardevUdp:
 #
 # Configuration info for datagram socket chardevs.
 #
 # @remote: remote address
 # @local: local address
 #
 # Since: 1.5
 ##
 { 'struct': 'ChardevUdp', 'data': { 'remote' : 'SocketAddressLegacy',
                                   '*local' : 'SocketAddressLegacy' },
   'base': 'ChardevCommon' }

 ##
 # @ChardevMux:
 #
 # Configuration info for mux chardevs.
 #
 # @chardev: name of the base chardev.
 #
 # Since: 1.5
 ##
 { 'struct': 'ChardevMux', 'data': { 'chardev' : 'str' },
   'base': 'ChardevCommon' }

 ##
 # @ChardevStdio:
 #
 # Configuration info for stdio chardevs.
 #
 # @signal: Allow signals (such as SIGINT triggered by ^C)
 #          be delivered to qemu.  Default: true in -nographic mode,
 #          false otherwise.
 #
 # Since: 1.5
 ##
 { 'struct': 'ChardevStdio', 'data': { '*signal' : 'bool' },
   'base': 'ChardevCommon' }


 ##
 # @ChardevSpiceChannel:
 #
 # Configuration info for spice vm channel chardevs.
 #
 # @type: kind of channel (for example vdagent).
 #
 # Since: 1.5
 ##
 { 'struct': 'ChardevSpiceChannel', 'data': { 'type'  : 'str' },
   'base': 'ChardevCommon' }
 # TODO: 'if': 'defined(CONFIG_SPICE)'

 ##
 # @ChardevSpicePort:
 #
 # Configuration info for spice port chardevs.
 #
 # @fqdn: name of the channel (see docs/spice-port-fqdn.txt)
 #
 # Since: 1.5
 ##
 { 'struct': 'ChardevSpicePort', 'data': { 'fqdn'  : 'str' },
   'base': 'ChardevCommon' }
 # TODO: 'if': 'defined(CONFIG_SPICE)'

 ##
 # @ChardevVC:
 #
 # Configuration info for virtual console chardevs.
 #
 # @width:  console width,  in pixels
 # @height: console height, in pixels
 # @cols:   console width,  in chars
 # @rows:   console height, in chars
 #
 # Since: 1.5
 ##
 { 'struct': 'ChardevVC', 'data': { '*width'  : 'int',
                                  '*height' : 'int',
                                  '*cols'   : 'int',
                                  '*rows'   : 'int' },
   'base': 'ChardevCommon' }

 ##
 # @ChardevRingbuf:
 #
 # Configuration info for ring buffer chardevs.
 #
 # @size: ring buffer size, must be power of two, default is 65536
 #
 # Since: 1.5
 ##
 { 'struct': 'ChardevRingbuf', 'data': { '*size'  : 'int' },
   'base': 'ChardevCommon' }

 ##
 # @ChardevBackend:
 #
 # Configuration info for the new chardev backend.
 #
 # Since: 1.4 (testdev since 2.2, wctablet since 2.9)
 ##
 { 'union': 'ChardevBackend', 'data': { 'file'   : 'ChardevFile',
                                        'serial' : 'ChardevHostdev',
                                        'parallel': 'ChardevHostdev',
                                        'pipe'   : 'ChardevHostdev',
                                        'socket' : 'ChardevSocket',
                                        'udp'    : 'ChardevUdp',
                                        'pty'    : 'ChardevCommon',
                                        'null'   : 'ChardevCommon',
                                        'mux'    : 'ChardevMux',
                                        'msmouse': 'ChardevCommon',
                                        'wctablet' : 'ChardevCommon',
                                        'braille': 'ChardevCommon',
                                        'testdev': 'ChardevCommon',
                                        'stdio'  : 'ChardevStdio',
                                        'console': 'ChardevCommon',
                                        'spicevmc': 'ChardevSpiceChannel',
 # TODO: { 'type': 'ChardevSpiceChannel', 'if': 'defined(CONFIG_SPICE)' },
                                        'spiceport': 'ChardevSpicePort',
 # TODO: { 'type': 'ChardevSpicePort', 'if': 'defined(CONFIG_SPICE)' },
                                        'vc'     : 'ChardevVC',
                                        'ringbuf': 'ChardevRingbuf',
                                        # next one is just for compatibility
                                        'memory' : 'ChardevRingbuf' } }

 ##
 # @ChardevReturn:
 #
 # Return info about the chardev backend just created.
 #
 # @pty: name of the slave pseudoterminal device, present if
 #       and only if a chardev of type 'pty' was created
 #
 # Since: 1.4
 ##
 { 'struct' : 'ChardevReturn', 'data': { '*pty' : 'str' } }

 ##
 # @chardev-add:
 #
 # Add a character device backend
 #
 # @id: the chardev's ID, must be unique
 # @backend: backend type and parameters
 #
 # Returns: ChardevReturn.
 #
 # Since: 1.4
 #
 # Example:
 #
 # -> { "execute" : "chardev-add",
 #      "arguments" : { "id" : "foo",
 #                      "backend" : { "type" : "null", "data" : {} } } }
 # <- { "return": {} }
 #
 # -> { "execute" : "chardev-add",
 #      "arguments" : { "id" : "bar",
 #                      "backend" : { "type" : "file",
 #                                    "data" : { "out" : "/tmp/bar.log" } } } }
 # <- { "return": {} }
 #
 # -> { "execute" : "chardev-add",
 #      "arguments" : { "id" : "baz",
 #                      "backend" : { "type" : "pty", "data" : {} } } }
 # <- { "return": { "pty" : "/dev/pty/42" } }
 #
 ##
 { 'command': 'chardev-add', 'data': {'id'      : 'str',
                                      'backend' : 'ChardevBackend' },
   'returns': 'ChardevReturn' }

 ##
 # @chardev-change:
 #
 # Change a character device backend
 #
 # @id: the chardev's ID, must exist
 # @backend: new backend type and parameters
 #
 # Returns: ChardevReturn.
 #
 # Since: 2.10
 #
 # Example:
 #
 # -> { "execute" : "chardev-change",
 #      "arguments" : { "id" : "baz",
 #                      "backend" : { "type" : "pty", "data" : {} } } }
 # <- { "return": { "pty" : "/dev/pty/42" } }
 #
 # -> {"execute" : "chardev-change",
 #     "arguments" : {
 #         "id" : "charchannel2",
 #         "backend" : {
 #             "type" : "socket",
 #             "data" : {
 #                 "addr" : {
 #                     "type" : "unix" ,
 #                     "data" : {
 #                         "path" : "/tmp/charchannel2.socket"
 #                     }
 #                  },
 #                  "server" : true,
 #                  "wait" : false }}}}
 # <- {"return": {}}
 #
 ##
 { 'command': 'chardev-change', 'data': {'id'      : 'str',
                                         'backend' : 'ChardevBackend' },
   'returns': 'ChardevReturn' }

 ##
 # @chardev-remove:
 #
 # Remove a character device backend
 #
 # @id: the chardev's ID, must exist and not be in use
 #
 # Returns: Nothing on success
 #
 # Since: 1.4
 #
 # Example:
 #
 # -> { "execute": "chardev-remove", "arguments": { "id" : "foo" } }
 # <- { "return": {} }
 #
 ##
 { 'command': 'chardev-remove', 'data': {'id': 'str'} }

 ##
 # @chardev-send-break:
 #
 # Send a break to a character device
 #
 # @id: the chardev's ID, must exist
 #
 # Returns: Nothing on success
 #
 # Since: 2.10
 #
 # Example:
 #
 # -> { "execute": "chardev-send-break", "arguments": { "id" : "foo" } }
 # <- { "return": {} }
 #
 ##
 { 'command': 'chardev-send-break', 'data': {'id': 'str'} }

 ##
 # @VSERPORT_CHANGE:
 #
 # Emitted when the guest opens or closes a virtio-serial port.
 #
 # @id: device identifier of the virtio-serial port
 #
 # @open: true if the guest has opened the virtio-serial port
 #
 # Since: 2.1
 #
 # Example:
 #
 # <- { "event": "VSERPORT_CHANGE",
 #      "data": { "id": "channel0", "open": true },
 #      "timestamp": { "seconds": 1401385907, "microseconds": 422329 } }
 #
 ##
 { 'event': 'VSERPORT_CHANGE',
   'data': { 'id': 'str', 'open': 'bool' } }
	# -- Mode: Python --
	#

	##
	# = Character devices
	##

	{ 'include': 'sockets.json' }

	##
	# @ChardevInfo:
	#
	# Information about a character device.
	#
	# @label: the label of the character device
	#
	# @filename: the filename of the character device
	#
	# @frontend-open: shows whether the frontend device attached to this backend
	# (eg. with the chardev=... option) is in open or closed state
	# (since 2.1)
	#
	# Notes: @filename is encoded using the QEMU command line character device
	# encoding. See the QEMU man page for details.
	#
	# Since: 0.14.0
	##
	{ 'struct': 'ChardevInfo', 'data': {'label': 'str',
	'filename': 'str',
	'frontend-open': 'bool'} }

	##
	# @query-chardev:
	#
	# Returns information about current character devices.
	#
	# Returns: a list of @ChardevInfo
	#
	# Since: 0.14.0
	#
	# Example:
	#
	# -> { "execute": "query-chardev" }
	# <- {
	# "return": [
	# {
	# "label": "charchannel0",
	# "filename": "unix:/var/lib/libvirt/qemu/seabios.rhel6.agent,server",
	# "frontend-open": false
	# },
	# {
	# "label": "charmonitor",
	# "filename": "unix:/var/lib/libvirt/qemu/seabios.rhel6.monitor,server",
	# "frontend-open": true
	# },
	# {
	# "label": "charserial0",
	# "filename": "pty:/dev/pts/2",
	# "frontend-open": true
	# }
	# ]
	# }
	#
	##
	{ 'command': 'query-chardev', 'returns': ['ChardevInfo'],
	'allow-preconfig': true }

	##
	# @ChardevBackendInfo:
	#
	# Information about a character device backend
	#
	# @name: The backend name
	#
	# Since: 2.0
	##
	{ 'struct': 'ChardevBackendInfo', 'data': {'name': 'str'} }

	##
	# @query-chardev-backends:
	#
	# Returns information about character device backends.
	#
	# Returns: a list of @ChardevBackendInfo
	#
	# Since: 2.0
	#
	# Example:
	#
	# -> { "execute": "query-chardev-backends" }
	# <- {
	# "return":[
	# {
	# "name":"udp"
	# },
	# {
	# "name":"tcp"
	# },
	# {
	# "name":"unix"
	# },
	# {
	# "name":"spiceport"
	# }
	# ]
	# }
	#
	##
	{ 'command': 'query-chardev-backends', 'returns': ['ChardevBackendInfo'] }

	##
	# @DataFormat:
	#
	# An enumeration of data format.
	#
	# @utf8: Data is a UTF-8 string (RFC 3629)
	#
	# @base64: Data is Base64 encoded binary (RFC 3548)
	#
	# Since: 1.4
	##
	{ 'enum': 'DataFormat',
	'data': [ 'utf8', 'base64' ] }

	##
	# @ringbuf-write:
	#
	# Write to a ring buffer character device.
	#
	# @device: the ring buffer character device name
	#
	# @data: data to write
	#
	# @format: data encoding (default 'utf8').
	# - base64: data must be base64 encoded text. Its binary
	# decoding gets written.
	# - utf8: data's UTF-8 encoding is written
	# - data itself is always Unicode regardless of format, like
	# any other string.
	#
	# Returns: Nothing on success
	#
	# Since: 1.4
	#
	# Example:
	#
	# -> { "execute": "ringbuf-write",
	# "arguments": { "device": "foo",
	# "data": "abcdefgh",
	# "format": "utf8" } }
	# <- { "return": {} }
	#
	##
	{ 'command': 'ringbuf-write',
	'data': {'device': 'str', 'data': 'str',
	'*format': 'DataFormat'} }

	##
	# @ringbuf-read:
	#
	# Read from a ring buffer character device.
	#
	# @device: the ring buffer character device name
	#
	# @size: how many bytes to read at most
	#
	# @format: data encoding (default 'utf8').
	# - base64: the data read is returned in base64 encoding.
	# - utf8: the data read is interpreted as UTF-8.
	# Bug: can screw up when the buffer contains invalid UTF-8
	# sequences, NUL characters, after the ring buffer lost
	# data, and when reading stops because the size limit is
	# reached.
	# - The return value is always Unicode regardless of format,
	# like any other string.
	#
	# Returns: data read from the device
	#
	# Since: 1.4
	#
	# Example:
	#
	# -> { "execute": "ringbuf-read",
	# "arguments": { "device": "foo",
	# "size": 1000,
	# "format": "utf8" } }
	# <- { "return": "abcdefgh" }
	#
	##
	{ 'command': 'ringbuf-read',
	'data': {'device': 'str', 'size': 'int', '*format': 'DataFormat'},
	'returns': 'str' }

	##
	# @ChardevCommon:
	#
	# Configuration shared across all chardev backends
	#
	# @logfile: The name of a logfile to save output
	# @logappend: true to append instead of truncate
	# (default to false to truncate)
	#
	# Since: 2.6
	##
	{ 'struct': 'ChardevCommon', 'data': { '*logfile': 'str',
	'*logappend': 'bool' } }

	##
	# @ChardevFile:
	#
	# Configuration info for file chardevs.
	#
	# @in: The name of the input file
	# @out: The name of the output file
	# @append: Open the file in append mode (default false to
	# truncate) (Since 2.6)
	#
	# Since: 1.4
	##
	{ 'struct': 'ChardevFile', 'data': { '*in' : 'str',
	'out' : 'str',
	'*append': 'bool' },
	'base': 'ChardevCommon' }

	##
	# @ChardevHostdev:
	#
	# Configuration info for device and pipe chardevs.
	#
	# @device: The name of the special file for the device,
	# i.e. /dev/ttyS0 on Unix or COM1: on Windows
	#
	# Since: 1.4
	##
	{ 'struct': 'ChardevHostdev', 'data': { 'device' : 'str' },
	'base': 'ChardevCommon' }

	##
	# @ChardevSocket:
	#
	# Configuration info for (stream) socket chardevs.
	#
	# @addr: socket address to listen on (server=true)
	# or connect to (server=false)
	# @tls-creds: the ID of the TLS credentials object (since 2.6)
	# @server: create server socket (default: true)
	# @wait: wait for incoming connection on server
	# sockets (default: false).
	# @nodelay: set TCP_NODELAY socket option (default: false)
	# @telnet: enable telnet protocol on server
	# sockets (default: false)
	# @tn3270: enable tn3270 protocol on server
	# sockets (default: false) (Since: 2.10)
	# @reconnect: For a client socket, if a socket is disconnected,
	# then attempt a reconnect after the given number of seconds.
	# Setting this to zero disables this function. (default: 0)
	# (Since: 2.2)
	#
	# Since: 1.4
	##
	{ 'struct': 'ChardevSocket', 'data': { 'addr' : 'SocketAddressLegacy',
	'*tls-creds' : 'str',
	'*server' : 'bool',
	'*wait' : 'bool',
	'*nodelay' : 'bool',
	'*telnet' : 'bool',
	'*tn3270' : 'bool',
	'*reconnect' : 'int' },
	'base': 'ChardevCommon' }

	##
	# @ChardevUdp:
	#
	# Configuration info for datagram socket chardevs.
	#
	# @remote: remote address
	# @local: local address
	#
	# Since: 1.5
	##
	{ 'struct': 'ChardevUdp', 'data': { 'remote' : 'SocketAddressLegacy',
	'*local' : 'SocketAddressLegacy' },
	'base': 'ChardevCommon' }

	##
	# @ChardevMux:
	#
	# Configuration info for mux chardevs.
	#
	# @chardev: name of the base chardev.
	#
	# Since: 1.5
	##
	{ 'struct': 'ChardevMux', 'data': { 'chardev' : 'str' },
	'base': 'ChardevCommon' }

	##
	# @ChardevStdio:
	#
	# Configuration info for stdio chardevs.
	#
	# @signal: Allow signals (such as SIGINT triggered by ^C)
	# be delivered to qemu. Default: true in -nographic mode,
	# false otherwise.
	#
	# Since: 1.5
	##
	{ 'struct': 'ChardevStdio', 'data': { '*signal' : 'bool' },
	'base': 'ChardevCommon' }


	##
	# @ChardevSpiceChannel:
	#
	# Configuration info for spice vm channel chardevs.
	#
	# @type: kind of channel (for example vdagent).
	#
	# Since: 1.5
	##
	{ 'struct': 'ChardevSpiceChannel', 'data': { 'type' : 'str' },
	'base': 'ChardevCommon' }
	# TODO: 'if': 'defined(CONFIG_SPICE)'

	##
	# @ChardevSpicePort:
	#
	# Configuration info for spice port chardevs.
	#
	# @fqdn: name of the channel (see docs/spice-port-fqdn.txt)
	#
	# Since: 1.5
	##
	{ 'struct': 'ChardevSpicePort', 'data': { 'fqdn' : 'str' },
	'base': 'ChardevCommon' }
	# TODO: 'if': 'defined(CONFIG_SPICE)'

	##
	# @ChardevVC:
	#
	# Configuration info for virtual console chardevs.
	#
	# @width: console width, in pixels
	# @height: console height, in pixels
	# @cols: console width, in chars
	# @rows: console height, in chars
	#
	# Since: 1.5
	##
	{ 'struct': 'ChardevVC', 'data': { '*width' : 'int',
	'*height' : 'int',
	'*cols' : 'int',
	'*rows' : 'int' },
	'base': 'ChardevCommon' }

	##
	# @ChardevRingbuf:
	#
	# Configuration info for ring buffer chardevs.
	#
	# @size: ring buffer size, must be power of two, default is 65536
	#
	# Since: 1.5
	##
	{ 'struct': 'ChardevRingbuf', 'data': { '*size' : 'int' },
	'base': 'ChardevCommon' }

	##
	# @ChardevBackend:
	#
	# Configuration info for the new chardev backend.
	#
	# Since: 1.4 (testdev since 2.2, wctablet since 2.9)
	##
	{ 'union': 'ChardevBackend', 'data': { 'file' : 'ChardevFile',
	'serial' : 'ChardevHostdev',
	'parallel': 'ChardevHostdev',
	'pipe' : 'ChardevHostdev',
	'socket' : 'ChardevSocket',
	'udp' : 'ChardevUdp',
	'pty' : 'ChardevCommon',
	'null' : 'ChardevCommon',
	'mux' : 'ChardevMux',
	'msmouse': 'ChardevCommon',
	'wctablet' : 'ChardevCommon',
	'braille': 'ChardevCommon',
	'testdev': 'ChardevCommon',
	'stdio' : 'ChardevStdio',
	'console': 'ChardevCommon',
	'spicevmc': 'ChardevSpiceChannel',
	# TODO: { 'type': 'ChardevSpiceChannel', 'if': 'defined(CONFIG_SPICE)' },
	'spiceport': 'ChardevSpicePort',
	# TODO: { 'type': 'ChardevSpicePort', 'if': 'defined(CONFIG_SPICE)' },
	'vc' : 'ChardevVC',
	'ringbuf': 'ChardevRingbuf',
	# next one is just for compatibility
	'memory' : 'ChardevRingbuf' } }

	##
	# @ChardevReturn:
	#
	# Return info about the chardev backend just created.
	#
	# @pty: name of the slave pseudoterminal device, present if
	# and only if a chardev of type 'pty' was created
	#
	# Since: 1.4
	##
	{ 'struct' : 'ChardevReturn', 'data': { '*pty' : 'str' } }

	##
	# @chardev-add:
	#
	# Add a character device backend
	#
	# @id: the chardev's ID, must be unique
	# @backend: backend type and parameters
	#
	# Returns: ChardevReturn.
	#
	# Since: 1.4
	#
	# Example:
	#
	# -> { "execute" : "chardev-add",
	# "arguments" : { "id" : "foo",
	# "backend" : { "type" : "null", "data" : {} } } }
	# <- { "return": {} }
	#
	# -> { "execute" : "chardev-add",
	# "arguments" : { "id" : "bar",
	# "backend" : { "type" : "file",
	# "data" : { "out" : "/tmp/bar.log" } } } }
	# <- { "return": {} }
	#
	# -> { "execute" : "chardev-add",
	# "arguments" : { "id" : "baz",
	# "backend" : { "type" : "pty", "data" : {} } } }
	# <- { "return": { "pty" : "/dev/pty/42" } }
	#
	##
	{ 'command': 'chardev-add', 'data': {'id' : 'str',
	'backend' : 'ChardevBackend' },
	'returns': 'ChardevReturn' }

	##
	# @chardev-change:
	#
	# Change a character device backend
	#
	# @id: the chardev's ID, must exist
	# @backend: new backend type and parameters
	#
	# Returns: ChardevReturn.
	#
	# Since: 2.10
	#
	# Example:
	#
	# -> { "execute" : "chardev-change",
	# "arguments" : { "id" : "baz",
	# "backend" : { "type" : "pty", "data" : {} } } }
	# <- { "return": { "pty" : "/dev/pty/42" } }
	#
	# -> {"execute" : "chardev-change",
	# "arguments" : {
	# "id" : "charchannel2",
	# "backend" : {
	# "type" : "socket",
	# "data" : {
	# "addr" : {
	# "type" : "unix" ,
	# "data" : {
	# "path" : "/tmp/charchannel2.socket"
	# }
	# },
	# "server" : true,
	# "wait" : false }}}}
	# <- {"return": {}}
	#
	##
	{ 'command': 'chardev-change', 'data': {'id' : 'str',
	'backend' : 'ChardevBackend' },
	'returns': 'ChardevReturn' }

	##
	# @chardev-remove:
	#
	# Remove a character device backend
	#
	# @id: the chardev's ID, must exist and not be in use
	#
	# Returns: Nothing on success
	#
	# Since: 1.4
	#
	# Example:
	#
	# -> { "execute": "chardev-remove", "arguments": { "id" : "foo" } }
	# <- { "return": {} }
	#
	##
	{ 'command': 'chardev-remove', 'data': {'id': 'str'} }

	##
	# @chardev-send-break:
	#
	# Send a break to a character device
	#
	# @id: the chardev's ID, must exist
	#
	# Returns: Nothing on success
	#
	# Since: 2.10
	#
	# Example:
	#
	# -> { "execute": "chardev-send-break", "arguments": { "id" : "foo" } }
	# <- { "return": {} }
	#
	##
	{ 'command': 'chardev-send-break', 'data': {'id': 'str'} }

	##
	# @VSERPORT_CHANGE:
	#
	# Emitted when the guest opens or closes a virtio-serial port.
	#
	# @id: device identifier of the virtio-serial port
	#
	# @open: true if the guest has opened the virtio-serial port
	#
	# Since: 2.1
	#
	# Example:
	#
	# <- { "event": "VSERPORT_CHANGE",
	# "data": { "id": "channel0", "open": true },
	# "timestamp": { "seconds": 1401385907, "microseconds": 422329 } }
	#
	##
	{ 'event': 'VSERPORT_CHANGE',
	'data': { 'id': 'str', 'open': 'bool' } }