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562 lines
20 KiB
Plaintext
562 lines
20 KiB
Plaintext
zmq_setsockopt(3)
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=================
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NAME
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----
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zmq_setsockopt - set 0MQ socket options
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SYNOPSIS
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--------
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*int zmq_setsockopt (void '*socket', int 'option_name', const void '*option_value', size_t 'option_len');*
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Caution: All options, with the exception of ZMQ_SUBSCRIBE, ZMQ_UNSUBSCRIBE,
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ZMQ_LINGER, ZMQ_ROUTER_MANDATORY and ZMQ_XPUB_VERBOSE only take effect for
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subsequent socket bind/connects.
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DESCRIPTION
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-----------
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The _zmq_setsockopt()_ function shall set the option specified by the
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'option_name' argument to the value pointed to by the 'option_value' argument
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for the 0MQ socket pointed to by the 'socket' argument. The 'option_len'
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argument is the size of the option value in bytes.
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The following socket options can be set with the _zmq_setsockopt()_ function:
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ZMQ_SNDHWM: Set high water mark for outbound messages
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The 'ZMQ_SNDHWM' option shall set the high water mark for outbound messages on
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the specified 'socket'. The high water mark is a hard limit on the maximum
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number of outstanding messages 0MQ shall queue in memory for any single peer
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that the specified 'socket' is communicating with. A value of zero means no
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limit.
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If this limit has been reached the socket shall enter an exceptional state and
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depending on the socket type, 0MQ shall take appropriate action such as
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blocking or dropping sent messages. Refer to the individual socket descriptions
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in linkzmq:zmq_socket[3] for details on the exact action taken for each socket
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type.
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NOTE: 0MQ does not guarantee that the socket will accept as many as ZMQ_SNDHWM
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messages, and the actual limit may be as much as 60-70% lower depending on the
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flow of messages on the socket.
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[horizontal]
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Option value type:: int
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Option value unit:: messages
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Default value:: 1000
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Applicable socket types:: all
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ZMQ_RCVHWM: Set high water mark for inbound messages
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The 'ZMQ_RCVHWM' option shall set the high water mark for inbound messages on
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the specified 'socket'. The high water mark is a hard limit on the maximum
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number of outstanding messages 0MQ shall queue in memory for any single peer
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that the specified 'socket' is communicating with. A value of zero means no
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limit.
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If this limit has been reached the socket shall enter an exceptional state and
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depending on the socket type, 0MQ shall take appropriate action such as
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blocking or dropping sent messages. Refer to the individual socket descriptions
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in linkzmq:zmq_socket[3] for details on the exact action taken for each socket
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type.
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[horizontal]
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Option value type:: int
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Option value unit:: messages
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Default value:: 1000
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Applicable socket types:: all
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ZMQ_AFFINITY: Set I/O thread affinity
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The 'ZMQ_AFFINITY' option shall set the I/O thread affinity for newly created
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connections on the specified 'socket'.
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Affinity determines which threads from the 0MQ I/O thread pool associated with
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the socket's _context_ shall handle newly created connections. A value of zero
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specifies no affinity, meaning that work shall be distributed fairly among all
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0MQ I/O threads in the thread pool. For non-zero values, the lowest bit
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corresponds to thread 1, second lowest bit to thread 2 and so on. For example,
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a value of 3 specifies that subsequent connections on 'socket' shall be handled
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exclusively by I/O threads 1 and 2.
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See also linkzmq:zmq_init[3] for details on allocating the number of I/O
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threads for a specific _context_.
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[horizontal]
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Option value type:: uint64_t
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Option value unit:: N/A (bitmap)
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Default value:: 0
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Applicable socket types:: N/A
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ZMQ_SUBSCRIBE: Establish message filter
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The 'ZMQ_SUBSCRIBE' option shall establish a new message filter on a 'ZMQ_SUB'
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socket. Newly created 'ZMQ_SUB' sockets shall filter out all incoming messages,
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therefore you should call this option to establish an initial message filter.
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An empty 'option_value' of length zero shall subscribe to all incoming
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messages. A non-empty 'option_value' shall subscribe to all messages beginning
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with the specified prefix. Multiple filters may be attached to a single
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'ZMQ_SUB' socket, in which case a message shall be accepted if it matches at
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least one filter.
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[horizontal]
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Option value type:: binary data
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Option value unit:: N/A
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Default value:: N/A
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Applicable socket types:: ZMQ_SUB
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ZMQ_UNSUBSCRIBE: Remove message filter
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The 'ZMQ_UNSUBSCRIBE' option shall remove an existing message filter on a
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'ZMQ_SUB' socket. The filter specified must match an existing filter previously
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established with the 'ZMQ_SUBSCRIBE' option. If the socket has several
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instances of the same filter attached the 'ZMQ_UNSUBSCRIBE' option shall remove
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only one instance, leaving the rest in place and functional.
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[horizontal]
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Option value type:: binary data
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Option value unit:: N/A
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Default value:: N/A
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Applicable socket types:: ZMQ_SUB
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ZMQ_IDENTITY: Set socket identity
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The 'ZMQ_IDENTITY' option shall set the identity of the specified 'socket'.
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Socket identity is used only by request/reply pattern. Namely, it can be used
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in tandem with ROUTER socket to route messages to the peer with specific
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identity.
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Identity should be at least one byte and at most 255 bytes long. Identities
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starting with binary zero are reserved for use by 0MQ infrastructure.
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If two peers use the same identity when connecting to a third peer, the
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results shall be undefined.
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[horizontal]
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Option value type:: binary data
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Option value unit:: N/A
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Default value:: NULL
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Applicable socket types:: all
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ZMQ_RATE: Set multicast data rate
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The 'ZMQ_RATE' option shall set the maximum send or receive data rate for
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multicast transports such as linkzmq:zmq_pgm[7] using the specified 'socket'.
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[horizontal]
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Option value type:: int
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Option value unit:: kilobits per second
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Default value:: 100
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Applicable socket types:: all, when using multicast transports
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ZMQ_RECOVERY_IVL: Set multicast recovery interval
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The 'ZMQ_RECOVERY_IVL' option shall set the recovery interval for multicast
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transports using the specified 'socket'. The recovery interval determines the
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maximum time in milliseconds that a receiver can be absent from a multicast
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group before unrecoverable data loss will occur.
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CAUTION: Exercise care when setting large recovery intervals as the data
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needed for recovery will be held in memory. For example, a 1 minute recovery
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interval at a data rate of 1Gbps requires a 7GB in-memory buffer.
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[horizontal]
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Option value type:: int
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Option value unit:: milliseconds
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Default value:: 10000
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Applicable socket types:: all, when using multicast transports
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ZMQ_SNDBUF: Set kernel transmit buffer size
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The 'ZMQ_SNDBUF' option shall set the underlying kernel transmit buffer size
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for the 'socket' to the specified size in bytes. A value of zero means leave
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the OS default unchanged. For details please refer to your operating system
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documentation for the 'SO_SNDBUF' socket option.
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[horizontal]
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Option value type:: int
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Option value unit:: bytes
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Default value:: 0
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Applicable socket types:: all
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ZMQ_RCVBUF: Set kernel receive buffer size
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The 'ZMQ_RCVBUF' option shall set the underlying kernel receive buffer size for
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the 'socket' to the specified size in bytes. A value of zero means leave the
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OS default unchanged. For details refer to your operating system documentation
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for the 'SO_RCVBUF' socket option.
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[horizontal]
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Option value type:: int
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Option value unit:: bytes
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Default value:: 0
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Applicable socket types:: all
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ZMQ_LINGER: Set linger period for socket shutdown
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The 'ZMQ_LINGER' option shall set the linger period for the specified 'socket'.
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The linger period determines how long pending messages which have yet to be
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sent to a peer shall linger in memory after a socket is closed with
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linkzmq:zmq_close[3], and further affects the termination of the socket's
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context with linkzmq:zmq_term[3]. The following outlines the different
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behaviours:
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* The default value of '-1' specifies an infinite linger period. Pending
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messages shall not be discarded after a call to _zmq_close()_; attempting to
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terminate the socket's context with _zmq_term()_ shall block until all
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pending messages have been sent to a peer.
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* The value of '0' specifies no linger period. Pending messages shall be
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discarded immediately when the socket is closed with _zmq_close()_.
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* Positive values specify an upper bound for the linger period in milliseconds.
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Pending messages shall not be discarded after a call to _zmq_close()_;
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attempting to terminate the socket's context with _zmq_term()_ shall block
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until either all pending messages have been sent to a peer, or the linger
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period expires, after which any pending messages shall be discarded.
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[horizontal]
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Option value type:: int
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Option value unit:: milliseconds
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Default value:: -1 (infinite)
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Applicable socket types:: all
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ZMQ_RECONNECT_IVL: Set reconnection interval
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The 'ZMQ_RECONNECT_IVL' option shall set the initial reconnection interval for
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the specified 'socket'. The reconnection interval is the period 0MQ
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shall wait between attempts to reconnect disconnected peers when using
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connection-oriented transports. The value -1 means no reconnection.
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NOTE: The reconnection interval may be randomized by 0MQ to prevent
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reconnection storms in topologies with a large number of peers per socket.
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[horizontal]
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Option value type:: int
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Option value unit:: milliseconds
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Default value:: 100
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Applicable socket types:: all, only for connection-oriented transports
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ZMQ_RECONNECT_IVL_MAX: Set maximum reconnection interval
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The 'ZMQ_RECONNECT_IVL_MAX' option shall set the maximum reconnection interval
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for the specified 'socket'. This is the maximum period 0MQ shall wait between
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attempts to reconnect. On each reconnect attempt, the previous interval shall be
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doubled untill ZMQ_RECONNECT_IVL_MAX is reached. This allows for exponential
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backoff strategy. Default value means no exponential backoff is performed and
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reconnect interval calculations are only based on ZMQ_RECONNECT_IVL.
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NOTE: Values less than ZMQ_RECONNECT_IVL will be ignored.
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[horizontal]
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Option value type:: int
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Option value unit:: milliseconds
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Default value:: 0 (only use ZMQ_RECONNECT_IVL)
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Applicable socket types:: all, only for connection-oriented transports
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ZMQ_BACKLOG: Set maximum length of the queue of outstanding connections
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The 'ZMQ_BACKLOG' option shall set the maximum length of the queue of
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outstanding peer connections for the specified 'socket'; this only applies to
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connection-oriented transports. For details refer to your operating system
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documentation for the 'listen' function.
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[horizontal]
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Option value type:: int
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Option value unit:: connections
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Default value:: 100
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Applicable socket types:: all, only for connection-oriented transports.
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ZMQ_MAXMSGSIZE: Maximum acceptable inbound message size
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Limits the size of the inbound message. If a peer sends a message larger than
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ZMQ_MAXMSGSIZE it is disconnected. Value of -1 means 'no limit'.
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[horizontal]
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Option value type:: int64_t
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Option value unit:: bytes
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Default value:: -1
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Applicable socket types:: all
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ZMQ_MULTICAST_HOPS: Maximum network hops for multicast packets
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Sets the time-to-live field in every multicast packet sent from this socket.
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The default is 1 which means that the multicast packets don't leave the local
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network.
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[horizontal]
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Option value type:: int
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Option value unit:: network hops
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Default value:: 1
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Applicable socket types:: all, when using multicast transports
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ZMQ_RCVTIMEO: Maximum time before a recv operation returns with EAGAIN
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Sets the timeout for receive operation on the socket. If the value is `0`,
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_zmq_recv(3)_ will return immediately, with a EAGAIN error if there is no
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message to receive. If the value is `-1`, it will block until a message is
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available. For all other values, it will wait for a message for that amount
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of time before returning with an EAGAIN error.
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[horizontal]
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Option value type:: int
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Option value unit:: milliseconds
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Default value:: -1 (infinite)
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Applicable socket types:: all
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ZMQ_SNDTIMEO: Maximum time before a send operation returns with EAGAIN
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Sets the timeout for send operation on the socket. If the value is `0`,
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_zmq_send(3)_ will return immediately, with a EAGAIN error if the message
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cannot be sent. If the value is `-1`, it will block until the message is sent.
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For all other values, it will try to send the message for that amount of time
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before returning with an EAGAIN error.
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[horizontal]
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Option value type:: int
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Option value unit:: milliseconds
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Default value:: -1 (infinite)
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Applicable socket types:: all
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ZMQ_IPV6: Enable IPv6 on socket
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Set the IPv6 option for the socket. A value of `1` means IPv6 is
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enabled on the socket, while `0` means the socket will use only IPv4.
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When IPv6 is enabled the socket will connect to, or accept connections
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from, both IPv4 and IPv6 hosts.
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[horizontal]
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Option value type:: int
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Option value unit:: boolean
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Default value:: 0 (false)
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Applicable socket types:: all, when using TCP transports.
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ZMQ_IPV4ONLY: Use IPv4-only on socket
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Set the IPv4-only option for the socket. This option is deprecated.
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Please use the ZMQ_IPV6 option.
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[horizontal]
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Option value type:: int
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Option value unit:: boolean
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Default value:: 1 (true)
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Applicable socket types:: all, when using TCP transports.
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ZMQ_IMMEDIATE: Queue messages only to completed connections
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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By default queues will fill on outgoing connections even if the connection has
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not completed. This can lead to "lost" messages on sockets with round-robin
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routing (REQ, PUSH, DEALER). If this option is set to `1`, messages shall be
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queued only to completed connections. This will cause the socket to block if
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there are no other connections, but will prevent queues from filling on pipes
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awaiting connection.
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[horizontal]
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Option value type:: int
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Option value unit:: boolean
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Default value:: 0 (false)
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Applicable socket types:: all, only for connection-oriented transports.
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ZMQ_ROUTER_MANDATORY: accept only routable messages on ROUTER sockets
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Sets the 'ROUTER' socket behavior when an unroutable message is encountered. A
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value of `0` is the default and discards the message silently when it cannot be
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routed. A value of `1` returns an 'EHOSTUNREACH' error code if the message
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cannot be routed.
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[horizontal]
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Option value type:: int
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Option value unit:: 0, 1
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Default value:: 0
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Applicable socket types:: ZMQ_ROUTER
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ZMQ_ROUTER_RAW: switch ROUTER socket to raw mode
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Sets the raw mode on the 'ROUTER', when set to 1. When the ROUTER socket is in
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raw mode, and when using the tcp:// transport, it will read and write TCP data
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without 0MQ framing. This lets 0MQ applications talk to non-0MQ applications.
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When using raw mode, you cannot set explicit identities, and the ZMQ_MSGMORE
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flag is ignored when sending data messages. In raw mode you can close a specific
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connection by sending it a zero-length message (following the identity frame).
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[horizontal]
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Option value type:: int
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Option value unit:: 0, 1
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Default value:: 0
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Applicable socket types:: ZMQ_ROUTER
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ZMQ_XPUB_VERBOSE: provide all subscription messages on XPUB sockets
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Sets the 'XPUB' socket behavior on new subscriptions and unsubscriptions.
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A value of '0' is the default and passes only new subscription messages to
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upstream. A value of '1' passes all subscription messages upstream.
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[horizontal]
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Option value type:: int
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Option value unit:: 0, 1
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Default value:: 0
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Applicable socket types:: ZMQ_XPUB
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ZMQ_TCP_KEEPALIVE: Override SO_KEEPALIVE socket option
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Override 'SO_KEEPALIVE' socket option(where supported by OS).
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The default value of `-1` means to skip any overrides and leave it to OS default.
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[horizontal]
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Option value type:: int
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Option value unit:: -1,0,1
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Default value:: -1 (leave to OS default)
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Applicable socket types:: all, when using TCP transports.
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ZMQ_TCP_KEEPALIVE_IDLE: Override TCP_KEEPCNT(or TCP_KEEPALIVE on some OS)
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Override 'TCP_KEEPCNT'(or 'TCP_KEEPALIVE' on some OS) socket option(where supported by OS).
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The default value of `-1` means to skip any overrides and leave it to OS default.
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[horizontal]
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Option value type:: int
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Option value unit:: -1,>0
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Default value:: -1 (leave to OS default)
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Applicable socket types:: all, when using TCP transports.
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ZMQ_TCP_KEEPALIVE_CNT: Override TCP_KEEPCNT socket option
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Override 'TCP_KEEPCNT' socket option(where supported by OS).
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The default value of `-1` means to skip any overrides and leave it to OS default.
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[horizontal]
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Option value type:: int
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Option value unit:: -1,>0
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Default value:: -1 (leave to OS default)
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Applicable socket types:: all, when using TCP transports.
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ZMQ_TCP_KEEPALIVE_INTVL: Override TCP_KEEPINTVL socket option
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Override 'TCP_KEEPINTVL' socket option(where supported by OS).
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The default value of `-1` means to skip any overrides and leave it to OS default.
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[horizontal]
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Option value type:: int
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Option value unit:: -1,>0
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Default value:: -1 (leave to OS default)
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Applicable socket types:: all, when using TCP transports.
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ZMQ_TCP_ACCEPT_FILTER: Assign filters to allow new TCP connections
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Assign arbitrary number of filters that will be applied for each new TCP transport
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connection on a listening socket.
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If no filters applied, then TCP transport allows connections from any ip.
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If at least one filter is applied then new connection source ip should be matched.
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To clear all filters call zmq_setsockopt(socket, ZMQ_TCP_ACCEPT_FILTER, NULL, 0).
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Filter is a null-terminated string with ipv6 or ipv4 CIDR.
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[horizontal]
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Option value type:: binary data
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Option value unit:: N/A
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Default value:: no filters (allow from all)
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Applicable socket types:: all listening sockets, when using TCP transports.
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RETURN VALUE
|
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------------
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|
The _zmq_setsockopt()_ function shall return zero if successful. Otherwise it
|
|
shall return `-1` and set 'errno' to one of the values defined below.
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ERRORS
|
|
------
|
|
*EINVAL*::
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|
The requested option _option_name_ is unknown, or the requested _option_len_ or
|
|
_option_value_ is invalid.
|
|
*ETERM*::
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|
The 0MQ 'context' associated with the specified 'socket' was terminated.
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|
*ENOTSOCK*::
|
|
The provided 'socket' was invalid.
|
|
*EINTR*::
|
|
The operation was interrupted by delivery of a signal.
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|
|
|
|
|
EXAMPLE
|
|
-------
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|
.Subscribing to messages on a 'ZMQ_SUB' socket
|
|
----
|
|
/* Subscribe to all messages */
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|
rc = zmq_setsockopt (socket, ZMQ_SUBSCRIBE, "", 0);
|
|
assert (rc == 0);
|
|
/* Subscribe to messages prefixed with "ANIMALS.CATS" */
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|
rc = zmq_setsockopt (socket, ZMQ_SUBSCRIBE, "ANIMALS.CATS", 12);
|
|
----
|
|
|
|
.Setting I/O thread affinity
|
|
----
|
|
int64_t affinity;
|
|
/* Incoming connections on TCP port 5555 shall be handled by I/O thread 1 */
|
|
affinity = 1;
|
|
rc = zmq_setsockopt (socket, ZMQ_AFFINITY, &affinity, sizeof affinity);
|
|
assert (rc);
|
|
rc = zmq_bind (socket, "tcp://lo:5555");
|
|
assert (rc);
|
|
/* Incoming connections on TCP port 5556 shall be handled by I/O thread 2 */
|
|
affinity = 2;
|
|
rc = zmq_setsockopt (socket, ZMQ_AFFINITY, &affinity, sizeof affinity);
|
|
assert (rc);
|
|
rc = zmq_bind (socket, "tcp://lo:5556");
|
|
assert (rc);
|
|
----
|
|
|
|
|
|
SEE ALSO
|
|
--------
|
|
linkzmq:zmq_getsockopt[3]
|
|
linkzmq:zmq_socket[3]
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|
linkzmq:zmq[7]
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|
|
|
|
AUTHORS
|
|
-------
|
|
This page was written by the 0MQ community. To make a change please
|
|
read the 0MQ Contribution Policy at <http://www.zeromq.org/docs:contributing>.
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