mirror of
https://github.com/zeromq/libzmq.git
synced 2024-12-31 01:43:02 +08:00
a178097f95
Applications that use ZMQ_IDENTITY can be trapped by the artificial restriction on not using a binary zero as first byte. It's specially nasty on random generated identities, e.g. UUIDs, as the chance of a binary zero is low, so it will pass 255 out of 256 times. Solution: remove the restriction.
882 lines
33 KiB
Plaintext
882 lines
33 KiB
Plaintext
zmq_setsockopt(3)
|
|
=================
|
|
|
|
|
|
NAME
|
|
----
|
|
|
|
zmq_setsockopt - set 0MQ socket options
|
|
|
|
|
|
SYNOPSIS
|
|
--------
|
|
*int zmq_setsockopt (void '*socket', int 'option_name', const void '*option_value', size_t 'option_len');*
|
|
|
|
Caution: All options, with the exception of ZMQ_SUBSCRIBE, ZMQ_UNSUBSCRIBE,
|
|
ZMQ_LINGER, ZMQ_ROUTER_HANDOVER, ZMQ_ROUTER_MANDATORY, ZMQ_PROBE_ROUTER,
|
|
ZMQ_XPUB_VERBOSE, ZMQ_REQ_CORRELATE, and ZMQ_REQ_RELAXED, only take effect for
|
|
subsequent socket bind/connects.
|
|
|
|
Specifically, security options take effect for subsequent bind/connect calls,
|
|
and can be changed at any time to affect subsequent binds and/or connects.
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
The _zmq_setsockopt()_ function shall set the option specified by the
|
|
'option_name' argument to the value pointed to by the 'option_value' argument
|
|
for the 0MQ socket pointed to by the 'socket' argument. The 'option_len'
|
|
argument is the size of the option value in bytes.
|
|
|
|
The following socket options can be set with the _zmq_setsockopt()_ function:
|
|
|
|
|
|
ZMQ_AFFINITY: Set I/O thread affinity
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
The 'ZMQ_AFFINITY' option shall set the I/O thread affinity for newly created
|
|
connections on the specified 'socket'.
|
|
|
|
Affinity determines which threads from the 0MQ I/O thread pool associated with
|
|
the socket's _context_ shall handle newly created connections. A value of zero
|
|
specifies no affinity, meaning that work shall be distributed fairly among all
|
|
0MQ I/O threads in the thread pool. For non-zero values, the lowest bit
|
|
corresponds to thread 1, second lowest bit to thread 2 and so on. For example,
|
|
a value of 3 specifies that subsequent connections on 'socket' shall be handled
|
|
exclusively by I/O threads 1 and 2.
|
|
|
|
See also linkzmq:zmq_init[3] for details on allocating the number of I/O
|
|
threads for a specific _context_.
|
|
|
|
[horizontal]
|
|
Option value type:: uint64_t
|
|
Option value unit:: N/A (bitmap)
|
|
Default value:: 0
|
|
Applicable socket types:: N/A
|
|
|
|
|
|
ZMQ_BACKLOG: Set maximum length of the queue of outstanding connections
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
The 'ZMQ_BACKLOG' option shall set the maximum length of the queue of
|
|
outstanding peer connections for the specified 'socket'; this only applies to
|
|
connection-oriented transports. For details refer to your operating system
|
|
documentation for the 'listen' function.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: connections
|
|
Default value:: 100
|
|
Applicable socket types:: all, only for connection-oriented transports.
|
|
|
|
|
|
ZMQ_CONNECT_RID: Assign the next outbound connection id
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
The 'ZMQ_CONNECT_RID' option sets the peer id of the next host connected
|
|
via the zmq_connect() call, and immediately readies that connection for
|
|
data transfer with the named id. This option applies only to the first
|
|
subsequent call to zmq_connect(), calls thereafter use default connection
|
|
behavior.
|
|
|
|
Typical use is to set this socket option ahead of each zmq_connect() attempt
|
|
to a new host. Each connection MUST be assigned a unique name. Assigning a
|
|
name that is already in use is not allowed.
|
|
|
|
Useful when connecting ROUTER to ROUTER, or STREAM to STREAM, as it
|
|
allows for immediate sending to peers. Outbound id framing requirements
|
|
for ROUTER and STREAM sockets apply.
|
|
|
|
The peer id should be from 1 to 255 bytes long and MAY NOT start with
|
|
binary zero.
|
|
|
|
[horizontal]
|
|
Option value type:: binary data
|
|
Option value unit:: N/A
|
|
Default value:: NULL
|
|
Applicable socket types:: ZMQ_ROUTER, ZMQ_STREAM
|
|
|
|
|
|
ZMQ_CONFLATE: Keep only last message
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
If set, a socket shall keep only one message in its inbound/outbound
|
|
queue, this message being the last message received/the last message
|
|
to be sent. Ignores 'ZMQ_RCVHWM' and 'ZMQ_SNDHWM' options. Does not
|
|
support multi-part messages, in particular, only one part of it is kept
|
|
in the socket internal queue.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: boolean
|
|
Default value:: 0 (false)
|
|
Applicable socket types:: ZMQ_PULL, ZMQ_PUSH, ZMQ_SUB, ZMQ_PUB, ZMQ_DEALER
|
|
|
|
|
|
ZMQ_CURVE_PUBLICKEY: Set CURVE public key
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Sets the socket's long term public key. You must set this on CURVE client
|
|
sockets, see linkzmq:zmq_curve[7]. You can provide the key as 32 binary
|
|
bytes, or as a 40-character string encoded in the Z85 encoding format.
|
|
The public key must always be used with the matching secret key. To
|
|
generate a public/secret key pair, use linkzmq:zmq_curve_keypair[3].
|
|
|
|
[horizontal]
|
|
Option value type:: binary data or Z85 text string
|
|
Option value size:: 32 or 40
|
|
Default value:: NULL
|
|
Applicable socket types:: all, when using TCP transport
|
|
|
|
|
|
ZMQ_CURVE_SECRETKEY: Set CURVE secret key
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Sets the socket's long term secret key. You must set this on both CURVE
|
|
client and server sockets, see linkzmq:zmq_curve[7]. You can provide the
|
|
key as 32 binary bytes, or as a 40-character string encoded in the Z85
|
|
encoding format. To generate a public/secret key pair, use
|
|
linkzmq:zmq_curve_keypair[3].
|
|
|
|
[horizontal]
|
|
Option value type:: binary data or Z85 text string
|
|
Option value size:: 32 or 40
|
|
Default value:: NULL
|
|
Applicable socket types:: all, when using TCP transport
|
|
|
|
|
|
ZMQ_CURVE_SERVER: Set CURVE server role
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Defines whether the socket will act as server for CURVE security, see
|
|
linkzmq:zmq_curve[7]. A value of '1' means the socket will act as
|
|
CURVE server. A value of '0' means the socket will not act as CURVE
|
|
server, and its security role then depends on other option settings.
|
|
Setting this to '0' shall reset the socket security to NULL. When you
|
|
set this you must also set the server's secret key using the
|
|
ZMQ_CURVE_SECRETKEY option. A server socket does not need to know
|
|
its own public key.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: 0, 1
|
|
Default value:: 0
|
|
Applicable socket types:: all, when using TCP transport
|
|
|
|
|
|
ZMQ_CURVE_SERVERKEY: Set CURVE server key
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Sets the socket's long term server key. You must set this on CURVE client
|
|
sockets, see linkzmq:zmq_curve[7]. You can provide the key as 32 binary
|
|
bytes, or as a 40-character string encoded in the Z85 encoding format.
|
|
This key must have been generated together with the server's secret key.
|
|
|
|
[horizontal]
|
|
Option value type:: binary data or Z85 text string
|
|
Option value size:: 32 or 40
|
|
Default value:: NULL
|
|
Applicable socket types:: all, when using TCP transport
|
|
|
|
|
|
ZMQ_HANDSHAKE_IVL: Set maximum handshake interval
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
The 'ZMQ_HANDSHAKE_IVL' option shall set the maximum handshake interval for
|
|
the specified 'socket'. Handshaking is the exchange of socket configuration
|
|
information (socket type, identity, security) that occurs when a connection
|
|
is first opened, only for connection-oriented transports. If handshaking does
|
|
not complete within the configured time, the connection shall be closed.
|
|
The value 0 means no handshake time limit.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: milliseconds
|
|
Default value:: 30000
|
|
Applicable socket types:: all but ZMQ_STREAM, only for connection-oriented transports
|
|
|
|
|
|
ZMQ_IDENTITY: Set socket identity
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
The 'ZMQ_IDENTITY' option shall set the identity of the specified 'socket'
|
|
when connecting to a ROUTER socket. The identity should be from 1 to 255
|
|
bytes long and may contain any values.
|
|
|
|
If two clients use the same identity when connecting to a ROUTER, the
|
|
results shall depend on the ZMQ_ROUTER_HANDOVER option setting. If that
|
|
is not set (or set to the default of zero), the ROUTER socket shall reject
|
|
clients trying to connect with an already-used identity. If that option
|
|
is set to 1, the ROUTER socket shall hand-over the connection to the new
|
|
client and disconnect the existing one.
|
|
|
|
[horizontal]
|
|
Option value type:: binary data
|
|
Option value unit:: N/A
|
|
Default value:: NULL
|
|
Applicable socket types:: ZMQ_REQ, ZMQ_REP, ZMQ_ROUTER, ZMQ_DEALER.
|
|
|
|
|
|
ZMQ_IMMEDIATE: Queue messages only to completed connections
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
By default queues will fill on outgoing connections even if the connection has
|
|
not completed. This can lead to "lost" messages on sockets with round-robin
|
|
routing (REQ, PUSH, DEALER). If this option is set to `1`, messages shall be
|
|
queued only to completed connections. This will cause the socket to block if
|
|
there are no other connections, but will prevent queues from filling on pipes
|
|
awaiting connection.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: boolean
|
|
Default value:: 0 (false)
|
|
Applicable socket types:: all, only for connection-oriented transports.
|
|
|
|
|
|
ZMQ_IPC_FILTER_GID: Assign group ID filters to allow new IPC connections
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Assign an arbitrary number of filters that will be applied for each new IPC
|
|
transport connection on a listening socket. If no IPC filters are applied, then
|
|
the IPC transport allows connections from any process. If at least one UID,
|
|
GID, or PID filter is applied then new connection credentials should be
|
|
matched. To clear all GID filters call zmq_setsockopt(socket,
|
|
ZMQ_IPC_FILTER_GID, NULL, 0).
|
|
|
|
NOTE: GID filters are only available on platforms supporting SO_PEERCRED or
|
|
LOCAL_PEERCRED socket options (currently only Linux and later versions of
|
|
OS X).
|
|
|
|
[horizontal]
|
|
Option value type:: gid_t
|
|
Option value unit:: N/A
|
|
Default value:: no filters (allow from all)
|
|
Applicable socket types:: all listening sockets, when using IPC transports.
|
|
|
|
|
|
ZMQ_IPC_FILTER_PID: Assign process ID filters to allow new IPC connections
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Assign an arbitrary number of filters that will be applied for each new IPC
|
|
transport connection on a listening socket. If no IPC filters are applied, then
|
|
the IPC transport allows connections from any process. If at least one UID,
|
|
GID, or PID filter is applied then new connection credentials should be
|
|
matched. To clear all PID filters call zmq_setsockopt(socket,
|
|
ZMQ_IPC_FILTER_PID, NULL, 0).
|
|
|
|
NOTE: PID filters are only available on platforms supporting the SO_PEERCRED
|
|
socket option (currently only Linux).
|
|
|
|
[horizontal]
|
|
Option value type:: pid_t
|
|
Option value unit:: N/A
|
|
Default value:: no filters (allow from all)
|
|
Applicable socket types:: all listening sockets, when using IPC transports.
|
|
|
|
|
|
ZMQ_IPC_FILTER_UID: Assign user ID filters to allow new IPC connections
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Assign an arbitrary number of filters that will be applied for each new IPC
|
|
transport connection on a listening socket. If no IPC filters are applied, then
|
|
the IPC transport allows connections from any process. If at least one UID,
|
|
GID, or PID filter is applied then new connection credentials should be
|
|
matched. To clear all UID filters call zmq_setsockopt(socket,
|
|
ZMQ_IPC_FILTER_UID, NULL, 0).
|
|
|
|
NOTE: UID filters are only available on platforms supporting SO_PEERCRED or
|
|
LOCAL_PEERCRED socket options (currently only Linux and later versions of
|
|
OS X).
|
|
|
|
[horizontal]
|
|
Option value type:: uid_t
|
|
Option value unit:: N/A
|
|
Default value:: no filters (allow from all)
|
|
Applicable socket types:: all listening sockets, when using IPC transports.
|
|
|
|
|
|
ZMQ_IPV4ONLY: Use IPv4-only on socket
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Set the IPv4-only option for the socket. This option is deprecated.
|
|
Please use the ZMQ_IPV6 option.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: boolean
|
|
Default value:: 1 (true)
|
|
Applicable socket types:: all, when using TCP transports.
|
|
|
|
|
|
ZMQ_IPV6: Enable IPv6 on socket
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Set the IPv6 option for the socket. A value of `1` means IPv6 is
|
|
enabled on the socket, while `0` means the socket will use only IPv4.
|
|
When IPv6 is enabled the socket will connect to, or accept connections
|
|
from, both IPv4 and IPv6 hosts.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: boolean
|
|
Default value:: 0 (false)
|
|
Applicable socket types:: all, when using TCP transports.
|
|
|
|
|
|
ZMQ_LINGER: Set linger period for socket shutdown
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
The 'ZMQ_LINGER' option shall set the linger period for the specified 'socket'.
|
|
The linger period determines how long pending messages which have yet to be
|
|
sent to a peer shall linger in memory after a socket is disconnected with
|
|
linkzmq:zmq_disconnect[3] or closed with linkzmq:zmq_close[3], and further
|
|
affects the termination of the socket's context with linkzmq:zmq_term[3]. The
|
|
following outlines the different behaviours:
|
|
|
|
* The default value of '-1' specifies an infinite linger period. Pending
|
|
messages shall not be discarded after a call to _zmq_disconnect()_ or
|
|
_zmq_close()_; attempting to terminate the socket's context with _zmq_term()_
|
|
shall block until all pending messages have been sent to a peer.
|
|
|
|
* The value of '0' specifies no linger period. Pending messages shall be
|
|
discarded immediately after a call to _zmq_disconnect()_ or _zmq_close()_.
|
|
|
|
* Positive values specify an upper bound for the linger period in milliseconds.
|
|
Pending messages shall not be discarded after a call to _zmq_disconnect()_ or
|
|
_zmq_close()_; attempting to terminate the socket's context with _zmq_term()_
|
|
shall block until either all pending messages have been sent to a peer, or the
|
|
linger period expires, after which any pending messages shall be discarded.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: milliseconds
|
|
Default value:: -1 (infinite)
|
|
Applicable socket types:: all
|
|
|
|
|
|
ZMQ_MAXMSGSIZE: Maximum acceptable inbound message size
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Limits the size of the inbound message. If a peer sends a message larger than
|
|
ZMQ_MAXMSGSIZE it is disconnected. Value of -1 means 'no limit'.
|
|
|
|
[horizontal]
|
|
Option value type:: int64_t
|
|
Option value unit:: bytes
|
|
Default value:: -1
|
|
Applicable socket types:: all
|
|
|
|
|
|
ZMQ_MULTICAST_HOPS: Maximum network hops for multicast packets
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Sets the time-to-live field in every multicast packet sent from this socket.
|
|
The default is 1 which means that the multicast packets don't leave the local
|
|
network.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: network hops
|
|
Default value:: 1
|
|
Applicable socket types:: all, when using multicast transports
|
|
|
|
|
|
ZMQ_PLAIN_PASSWORD: Set PLAIN security password
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Sets the password for outgoing connections over TCP or IPC. If you set this
|
|
to a non-null value, the security mechanism used for connections shall be
|
|
PLAIN, see linkzmq:zmq_plain[7]. If you set this to a null value, the security
|
|
mechanism used for connections shall be NULL, see linkzmq:zmq_null[3].
|
|
|
|
[horizontal]
|
|
Option value type:: character string
|
|
Option value unit:: N/A
|
|
Default value:: not set
|
|
Applicable socket types:: all, when using TCP transport
|
|
|
|
|
|
ZMQ_PLAIN_SERVER: Set PLAIN server role
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Defines whether the socket will act as server for PLAIN security, see
|
|
linkzmq:zmq_plain[7]. A value of '1' means the socket will act as
|
|
PLAIN server. A value of '0' means the socket will not act as PLAIN
|
|
server, and its security role then depends on other option settings.
|
|
Setting this to '0' shall reset the socket security to NULL.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: 0, 1
|
|
Default value:: 0
|
|
Applicable socket types:: all, when using TCP transport
|
|
|
|
|
|
ZMQ_PLAIN_USERNAME: Set PLAIN security username
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Sets the username for outgoing connections over TCP or IPC. If you set this
|
|
to a non-null value, the security mechanism used for connections shall be
|
|
PLAIN, see linkzmq:zmq_plain[7]. If you set this to a null value, the security
|
|
mechanism used for connections shall be NULL, see linkzmq:zmq_null[3].
|
|
|
|
[horizontal]
|
|
Option value type:: character string
|
|
Option value unit:: N/A
|
|
Default value:: not set
|
|
Applicable socket types:: all, when using TCP transport
|
|
|
|
|
|
ZMQ_PROBE_ROUTER: bootstrap connections to ROUTER sockets
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
When set to 1, the socket will automatically send an empty message when a
|
|
new connection is made or accepted. You may set this on REQ, DEALER, or
|
|
ROUTER sockets connected to a ROUTER socket. The application must filter
|
|
such empty messages. The ZMQ_PROBE_ROUTER option in effect provides the
|
|
ROUTER application with an event signaling the arrival of a new peer.
|
|
|
|
NOTE: do not set this option on a socket that talks to any other socket
|
|
types: the results are undefined.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: 0, 1
|
|
Default value:: 0
|
|
Applicable socket types:: ZMQ_ROUTER, ZMQ_DEALER, ZMQ_REQ
|
|
|
|
|
|
ZMQ_RATE: Set multicast data rate
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
The 'ZMQ_RATE' option shall set the maximum send or receive data rate for
|
|
multicast transports such as linkzmq:zmq_pgm[7] using the specified 'socket'.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: kilobits per second
|
|
Default value:: 100
|
|
Applicable socket types:: all, when using multicast transports
|
|
|
|
|
|
ZMQ_RCVBUF: Set kernel receive buffer size
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
The 'ZMQ_RCVBUF' option shall set the underlying kernel receive buffer size for
|
|
the 'socket' to the specified size in bytes. A value of zero means leave the
|
|
OS default unchanged. For details refer to your operating system documentation
|
|
for the 'SO_RCVBUF' socket option.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: bytes
|
|
Default value:: 0
|
|
Applicable socket types:: all
|
|
|
|
|
|
ZMQ_RCVHWM: Set high water mark for inbound messages
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
The 'ZMQ_RCVHWM' option shall set the high water mark for inbound messages on
|
|
the specified 'socket'. The high water mark is a hard limit on the maximum
|
|
number of outstanding messages 0MQ shall queue in memory for any single peer
|
|
that the specified 'socket' is communicating with. A value of zero means no
|
|
limit.
|
|
|
|
If this limit has been reached the socket shall enter an exceptional state and
|
|
depending on the socket type, 0MQ shall take appropriate action such as
|
|
blocking or dropping sent messages. Refer to the individual socket descriptions
|
|
in linkzmq:zmq_socket[3] for details on the exact action taken for each socket
|
|
type.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: messages
|
|
Default value:: 1000
|
|
Applicable socket types:: all
|
|
|
|
|
|
ZMQ_RCVTIMEO: Maximum time before a recv operation returns with EAGAIN
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Sets the timeout for receive operation on the socket. If the value is `0`,
|
|
_zmq_recv(3)_ will return immediately, with a EAGAIN error if there is no
|
|
message to receive. If the value is `-1`, it will block until a message is
|
|
available. For all other values, it will wait for a message for that amount
|
|
of time before returning with an EAGAIN error.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: milliseconds
|
|
Default value:: -1 (infinite)
|
|
Applicable socket types:: all
|
|
|
|
|
|
ZMQ_RECONNECT_IVL: Set reconnection interval
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
The 'ZMQ_RECONNECT_IVL' option shall set the initial reconnection interval for
|
|
the specified 'socket'. The reconnection interval is the period 0MQ
|
|
shall wait between attempts to reconnect disconnected peers when using
|
|
connection-oriented transports. The value -1 means no reconnection.
|
|
|
|
NOTE: The reconnection interval may be randomized by 0MQ to prevent
|
|
reconnection storms in topologies with a large number of peers per socket.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: milliseconds
|
|
Default value:: 100
|
|
Applicable socket types:: all, only for connection-oriented transports
|
|
|
|
|
|
ZMQ_RECONNECT_IVL_MAX: Set maximum reconnection interval
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
The 'ZMQ_RECONNECT_IVL_MAX' option shall set the maximum reconnection interval
|
|
for the specified 'socket'. This is the maximum period 0MQ shall wait between
|
|
attempts to reconnect. On each reconnect attempt, the previous interval shall be
|
|
doubled untill ZMQ_RECONNECT_IVL_MAX is reached. This allows for exponential
|
|
backoff strategy. Default value means no exponential backoff is performed and
|
|
reconnect interval calculations are only based on ZMQ_RECONNECT_IVL.
|
|
|
|
NOTE: Values less than ZMQ_RECONNECT_IVL will be ignored.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: milliseconds
|
|
Default value:: 0 (only use ZMQ_RECONNECT_IVL)
|
|
Applicable socket types:: all, only for connection-oriented transports
|
|
|
|
|
|
ZMQ_RECOVERY_IVL: Set multicast recovery interval
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
The 'ZMQ_RECOVERY_IVL' option shall set the recovery interval for multicast
|
|
transports using the specified 'socket'. The recovery interval determines the
|
|
maximum time in milliseconds that a receiver can be absent from a multicast
|
|
group before unrecoverable data loss will occur.
|
|
|
|
CAUTION: Exercise care when setting large recovery intervals as the data
|
|
needed for recovery will be held in memory. For example, a 1 minute recovery
|
|
interval at a data rate of 1Gbps requires a 7GB in-memory buffer.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: milliseconds
|
|
Default value:: 10000
|
|
Applicable socket types:: all, when using multicast transports
|
|
|
|
|
|
ZMQ_REQ_CORRELATE: match replies with requests
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
The default behavior of REQ sockets is to rely on the ordering of messages to
|
|
match requests and responses and that is usually sufficient. When this option
|
|
is set to 1, the REQ socket will prefix outgoing messages with an extra frame
|
|
containing a request id. That means the full message is (request id, 0,
|
|
user frames...). The REQ socket will discard all incoming messages that don't
|
|
begin with these two frames.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: 0, 1
|
|
Default value:: 0
|
|
Applicable socket types:: ZMQ_REQ
|
|
|
|
|
|
ZMQ_REQ_RELAXED: relax strict alternation between request and reply
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
By default, a REQ socket does not allow initiating a new request with
|
|
_zmq_send(3)_ until the reply to the previous one has been received.
|
|
When set to 1, sending another message is allowed and has the effect of
|
|
disconnecting the underlying connection to the peer from which the reply was
|
|
expected, triggering a reconnection attempt on transports that support it.
|
|
The request-reply state machine is reset and a new request is sent to the
|
|
next available peer.
|
|
|
|
If set to 1, also enable ZMQ_REQ_CORRELATE to ensure correct matching of
|
|
requests and replies. Otherwise a late reply to an aborted request can be
|
|
reported as the reply to the superseding request.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: 0, 1
|
|
Default value:: 0
|
|
Applicable socket types:: ZMQ_REQ
|
|
|
|
|
|
ZMQ_ROUTER_HANDOVER: handle duplicate client identities on ROUTER sockets
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
If two clients use the same identity when connecting to a ROUTER, the
|
|
results shall depend on the ZMQ_ROUTER_HANDOVER option setting. If that
|
|
is not set (or set to the default of zero), the ROUTER socket shall reject
|
|
clients trying to connect with an already-used identity. If that option
|
|
is set to 1, the ROUTER socket shall hand-over the connection to the new
|
|
client and disconnect the existing one.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: 0, 1
|
|
Default value:: 0
|
|
Applicable socket types:: ZMQ_ROUTER
|
|
|
|
|
|
ZMQ_ROUTER_MANDATORY: accept only routable messages on ROUTER sockets
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Sets the ROUTER socket behavior when an unroutable message is encountered. A
|
|
value of `0` is the default and discards the message silently when it cannot be
|
|
routed. A value of `1` returns an 'EHOSTUNREACH' error code if the message
|
|
cannot be routed.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: 0, 1
|
|
Default value:: 0
|
|
Applicable socket types:: ZMQ_ROUTER
|
|
|
|
|
|
ZMQ_ROUTER_RAW: switch ROUTER socket to raw mode
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Sets the raw mode on the ROUTER, when set to 1. When the ROUTER socket is in
|
|
raw mode, and when using the tcp:// transport, it will read and write TCP data
|
|
without 0MQ framing. This lets 0MQ applications talk to non-0MQ applications.
|
|
When using raw mode, you cannot set explicit identities, and the ZMQ_SNDMORE
|
|
flag is ignored when sending data messages. In raw mode you can close a specific
|
|
connection by sending it a zero-length message (following the identity frame).
|
|
|
|
NOTE: This option is deprecated, please use ZMQ_STREAM sockets instead.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: 0, 1
|
|
Default value:: 0
|
|
Applicable socket types:: ZMQ_ROUTER
|
|
|
|
|
|
ZMQ_SNDBUF: Set kernel transmit buffer size
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
The 'ZMQ_SNDBUF' option shall set the underlying kernel transmit buffer size
|
|
for the 'socket' to the specified size in bytes. A value of zero means leave
|
|
the OS default unchanged. For details please refer to your operating system
|
|
documentation for the 'SO_SNDBUF' socket option.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: bytes
|
|
Default value:: 0
|
|
Applicable socket types:: all
|
|
|
|
|
|
ZMQ_SNDHWM: Set high water mark for outbound messages
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
The 'ZMQ_SNDHWM' option shall set the high water mark for outbound messages on
|
|
the specified 'socket'. The high water mark is a hard limit on the maximum
|
|
number of outstanding messages 0MQ shall queue in memory for any single peer
|
|
that the specified 'socket' is communicating with. A value of zero means no
|
|
limit.
|
|
|
|
If this limit has been reached the socket shall enter an exceptional state and
|
|
depending on the socket type, 0MQ shall take appropriate action such as
|
|
blocking or dropping sent messages. Refer to the individual socket descriptions
|
|
in linkzmq:zmq_socket[3] for details on the exact action taken for each socket
|
|
type.
|
|
|
|
NOTE: 0MQ does not guarantee that the socket will accept as many as ZMQ_SNDHWM
|
|
messages, and the actual limit may be as much as 60-70% lower depending on the
|
|
flow of messages on the socket.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: messages
|
|
Default value:: 1000
|
|
Applicable socket types:: all
|
|
|
|
|
|
ZMQ_SNDTIMEO: Maximum time before a send operation returns with EAGAIN
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Sets the timeout for send operation on the socket. If the value is `0`,
|
|
_zmq_send(3)_ will return immediately, with a EAGAIN error if the message
|
|
cannot be sent. If the value is `-1`, it will block until the message is sent.
|
|
For all other values, it will try to send the message for that amount of time
|
|
before returning with an EAGAIN error.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: milliseconds
|
|
Default value:: -1 (infinite)
|
|
Applicable socket types:: all
|
|
|
|
|
|
ZMQ_SUBSCRIBE: Establish message filter
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
The 'ZMQ_SUBSCRIBE' option shall establish a new message filter on a 'ZMQ_SUB'
|
|
socket. Newly created 'ZMQ_SUB' sockets shall filter out all incoming messages,
|
|
therefore you should call this option to establish an initial message filter.
|
|
|
|
An empty 'option_value' of length zero shall subscribe to all incoming
|
|
messages. A non-empty 'option_value' shall subscribe to all messages beginning
|
|
with the specified prefix. Multiple filters may be attached to a single
|
|
'ZMQ_SUB' socket, in which case a message shall be accepted if it matches at
|
|
least one filter.
|
|
|
|
[horizontal]
|
|
Option value type:: binary data
|
|
Option value unit:: N/A
|
|
Default value:: N/A
|
|
Applicable socket types:: ZMQ_SUB
|
|
|
|
|
|
ZMQ_TCP_ACCEPT_FILTER: Assign filters to allow new TCP connections
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Assign an arbitrary number of filters that will be applied for each new TCP
|
|
transport connection on a listening socket. If no filters are applied, then
|
|
the TCP transport allows connections from any IP address. If at least one
|
|
filter is applied then new connection source ip should be matched. To clear
|
|
all filters call zmq_setsockopt(socket, ZMQ_TCP_ACCEPT_FILTER, NULL, 0).
|
|
Filter is a null-terminated string with ipv6 or ipv4 CIDR.
|
|
|
|
[horizontal]
|
|
Option value type:: binary data
|
|
Option value unit:: N/A
|
|
Default value:: no filters (allow from all)
|
|
Applicable socket types:: all listening sockets, when using TCP transports.
|
|
|
|
|
|
ZMQ_TCP_KEEPALIVE: Override SO_KEEPALIVE socket option
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Override 'SO_KEEPALIVE' socket option (where supported by OS).
|
|
The default value of `-1` means to skip any overrides and leave it to OS default.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: -1,0,1
|
|
Default value:: -1 (leave to OS default)
|
|
Applicable socket types:: all, when using TCP transports.
|
|
|
|
|
|
ZMQ_TCP_KEEPALIVE_CNT: Override TCP_KEEPCNT socket option
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Override 'TCP_KEEPCNT' socket option (where supported by OS). The default
|
|
value of `-1` means to skip any overrides and leave it to OS default.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: -1,>0
|
|
Default value:: -1 (leave to OS default)
|
|
Applicable socket types:: all, when using TCP transports.
|
|
|
|
|
|
ZMQ_TCP_KEEPALIVE_IDLE: Override TCP_KEEPCNT (or TCP_KEEPALIVE on some OS)
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Override 'TCP_KEEPCNT' (or 'TCP_KEEPALIVE' on some OS) socket option (where
|
|
supported by OS). The default value of `-1` means to skip any overrides and
|
|
leave it to OS default.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: -1,>0
|
|
Default value:: -1 (leave to OS default)
|
|
Applicable socket types:: all, when using TCP transports.
|
|
|
|
|
|
ZMQ_TCP_KEEPALIVE_INTVL: Override TCP_KEEPINTVL socket option
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Override 'TCP_KEEPINTVL' socket option(where supported by OS). The default
|
|
value of `-1` means to skip any overrides and leave it to OS default.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: -1,>0
|
|
Default value:: -1 (leave to OS default)
|
|
Applicable socket types:: all, when using TCP transports.
|
|
|
|
|
|
ZMQ_TOS: Set the Type-of-Service on socket
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Sets the ToS fields (Differentiated services (DS) and Explicit Congestion
|
|
Notification (ECN) field of the IP header. The ToS field is typically used
|
|
to specify a packets priority. The availability of this option is dependent
|
|
on intermediate network equipment that inspect the ToS field andprovide a
|
|
path for low-delay, high-throughput, highly-reliable service, etc.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: >0
|
|
Default value:: 0
|
|
Applicable socket types:: all, only for connection-oriented transports
|
|
|
|
|
|
ZMQ_UNSUBSCRIBE: Remove message filter
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
The 'ZMQ_UNSUBSCRIBE' option shall remove an existing message filter on a
|
|
'ZMQ_SUB' socket. The filter specified must match an existing filter previously
|
|
established with the 'ZMQ_SUBSCRIBE' option. If the socket has several
|
|
instances of the same filter attached the 'ZMQ_UNSUBSCRIBE' option shall remove
|
|
only one instance, leaving the rest in place and functional.
|
|
|
|
[horizontal]
|
|
Option value type:: binary data
|
|
Option value unit:: N/A
|
|
Default value:: N/A
|
|
Applicable socket types:: ZMQ_SUB
|
|
|
|
|
|
ZMQ_XPUB_VERBOSE: provide all subscription messages on XPUB sockets
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Sets the 'XPUB' socket behavior on new subscriptions and unsubscriptions.
|
|
A value of '0' is the default and passes only new subscription messages to
|
|
upstream. A value of '1' passes all subscription messages upstream.
|
|
|
|
[horizontal]
|
|
Option value type:: int
|
|
Option value unit:: 0, 1
|
|
Default value:: 0
|
|
Applicable socket types:: ZMQ_XPUB
|
|
|
|
|
|
ZMQ_ZAP_DOMAIN: Set RFC 27 authentication domain
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Sets the domain for ZAP (ZMQ RFC 27) authentication. For NULL security (the
|
|
default on all tcp:// connections), ZAP authentication only happens if you
|
|
set a non-empty domain. For PLAIN and CURVE security, ZAP requests are always
|
|
made, if there is a ZAP handler present. See http://rfc.zeromq.org/spec:27
|
|
for more details.
|
|
|
|
[horizontal]
|
|
Option value type:: character string
|
|
Option value unit:: N/A
|
|
Default value:: not set
|
|
Applicable socket types:: all, when using TCP transport
|
|
|
|
|
|
RETURN VALUE
|
|
------------
|
|
The _zmq_setsockopt()_ function shall return zero if successful. Otherwise it
|
|
shall return `-1` and set 'errno' to one of the values defined below.
|
|
|
|
ERRORS
|
|
------
|
|
*EINVAL*::
|
|
The requested option _option_name_ is unknown, or the requested _option_len_ or
|
|
_option_value_ is invalid.
|
|
*ETERM*::
|
|
The 0MQ 'context' associated with the specified 'socket' was terminated.
|
|
*ENOTSOCK*::
|
|
The provided 'socket' was invalid.
|
|
*EINTR*::
|
|
The operation was interrupted by delivery of a signal.
|
|
|
|
|
|
EXAMPLE
|
|
-------
|
|
.Subscribing to messages on a 'ZMQ_SUB' socket
|
|
----
|
|
/* Subscribe to all messages */
|
|
rc = zmq_setsockopt (socket, ZMQ_SUBSCRIBE, "", 0);
|
|
assert (rc == 0);
|
|
/* Subscribe to messages prefixed with "ANIMALS.CATS" */
|
|
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]
|
|
linkzmq:zmq_plain[7]
|
|
linkzmq:zmq_curve[7]
|
|
linkzmq:zmq[7]
|
|
|
|
|
|
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>.
|