zmq_bind - Man Page

accept incoming connections on a socket


int zmq_bind (void *socket, const char *endpoint);


The zmq_bind() function binds the socket to a local endpoint and then accepts incoming connections on that endpoint.

The endpoint is a string consisting of a transport:// followed by an address. The transport specifies the underlying protocol to use. The address specifies the transport-specific address to bind to.

0MQ provides the the following transports:


unicast transport using TCP, see zmq_tcp(7)


local inter-process communication transport, see zmq_ipc(7)


local in-process (inter-thread) communication transport, see zmq_inproc(7)

pgm, ā€‰epgm

reliable multicast transport using PGM, see zmq_pgm(7)


virtual machine communications interface (VMCI), see zmq_vmci(7)


unreliable unicast and multicast using UDP, see zmq_udp(7)

Every 0MQ socket type except ZMQ_PAIR and ZMQ_CHANNEL supports one-to-many and many-to-one semantics. The precise semantics depend on the socket type and are defined in zmq_socket(3).

The ipc, tcp, vmci and udp transports accept wildcard addresses: see zmq_ipc(7), zmq_tcp(7), zmq_vmci(7) and zmq_udp(7) for details.


the address syntax may be different for zmq_bind() and zmq_connect() especially for the tcp, pgm and epgm transports.


following a zmq_bind(), the socket enters a mute state unless or until at least one incoming or outgoing connection is made, at which point the socket enters a ready state. In the mute state, the socket blocks or drops messages according to the socket type, as defined in zmq_socket(3). By contrast, following a libzmq:zmq_connect[3], the socket enters the ready state.

Return Value

The zmq_bind() function returns zero if successful. Otherwise it returns -1 and sets errno to one of the values defined below.



The endpoint supplied is invalid.


The requested transport protocol is not supported.


The requested transport protocol is not compatible with the socket type.


The requested address is already in use.


The requested address was not local.


The requested address specifies a nonexistent interface.


The 0MQ context associated with the specified socket was terminated.


The provided socket was invalid.


No I/O thread is available to accomplish the task.


Binding a publisher socket to an in-process and a TCP transport.

/* Create a ZMQ_PUB socket */
void *socket = zmq_socket (context, ZMQ_PUB);
assert (socket);
/* Bind it to a in-process transport with the address 'my_publisher' */
int rc = zmq_bind (socket, "inproc://my_publisher");
assert (rc == 0);
/* Bind it to a TCP transport on port 5555 of the 'eth0' interface */
rc = zmq_bind (socket, "tcp://eth0:5555");
assert (rc == 0);

See Also

zmq_connect(3) zmq_socket(3) zmq(7)


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Referenced By

zmq(7), zmq_connect(3), zmq_connect_peer(3), zmq_inproc(7), zmq_ipc(7), zmq_proxy(3), zmq_proxy_steerable(3), zmq_socket(3), zmq_tcp(7), zmq_tipc(7), zmq_unbind(3), zmq_vmci(7).

08/13/2020 0MQ 4.3.3 0MQ Manual