'\" t
.\"     Title: zmq_bind
.\"    Author: [see the "AUTHORS" section]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 03/20/2024
.\"    Manual: 0MQ Manual
.\"    Source: 0MQ 4.3.5
.\"  Language: English
.\"
.TH "ZMQ_BIND" "3" "03/20/2024" "0MQ 4\&.3\&.5" "0MQ Manual"
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.SH "NAME"
zmq_bind \- accept incoming connections on a socket
.SH "SYNOPSIS"
.sp
\fBint zmq_bind (void \fR\fB\fI*socket\fR\fR\fB, const char \fR\fB\fI*endpoint\fR\fR\fB);\fR
.SH "DESCRIPTION"
.sp
The \fIzmq_bind()\fR function binds the \fIsocket\fR to a local \fIendpoint\fR and then accepts incoming connections on that endpoint\&.
.sp
The \fIendpoint\fR is a string consisting of a \fItransport\fR:// followed by an \fIaddress\fR\&. The \fItransport\fR specifies the underlying protocol to use\&. The \fIaddress\fR specifies the transport\-specific address to bind to\&.
.sp
0MQ provides the the following transports:
.PP
\fItcp\fR
.RS 4
unicast transport using TCP, see
\fBzmq_tcp\fR(7)
.RE
.PP
\fIipc\fR
.RS 4
local inter\-process communication transport, see
\fBzmq_ipc\fR(7)
.RE
.PP
\fIinproc\fR
.RS 4
local in\-process (inter\-thread) communication transport, see
\fBzmq_inproc\fR(7)
.RE
.PP
\fIpgm\fR, \fIepgm\fR
.RS 4
reliable multicast transport using PGM, see
\fBzmq_pgm\fR(7)
.RE
.PP
\fIvmci\fR
.RS 4
virtual machine communications interface (VMCI), see
\fBzmq_vmci\fR(7)
.RE
.PP
\fIudp\fR
.RS 4
unreliable unicast and multicast using UDP, see
\fBzmq_udp\fR(7)
.RE
.sp
Every 0MQ socket type except \fIZMQ_PAIR\fR and \fIZMQ_CHANNEL\fR supports one\-to\-many and many\-to\-one semantics\&. The precise semantics depend on the socket type and are defined in \fBzmq_socket\fR(3)\&.
.sp
The \fIipc\fR, \fItcp\fR, \fIvmci\fR and \fIudp\fR transports accept wildcard addresses: see \fBzmq_ipc\fR(7), \fBzmq_tcp\fR(7), \fBzmq_vmci\fR(7) and \fBzmq_udp\fR(7) for details\&.
.if n \{\
.sp
.\}
.RS 4
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBNote\fR
.ps -1
.br
.sp
the address syntax may be different for \fIzmq_bind()\fR and \fIzmq_connect()\fR especially for the \fItcp\fR, \fIpgm\fR and \fIepgm\fR transports\&.
.sp .5v
.RE
.if n \{\
.sp
.\}
.RS 4
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBNote\fR
.ps -1
.br
.sp
following a \fIzmq_bind()\fR, the socket enters a \fImute\fR state unless or until at least one incoming or outgoing connection is made, at which point the socket enters a \fIready\fR state\&. In the mute state, the socket blocks or drops messages according to the socket type, as defined in \fBzmq_socket\fR(3)\&. By contrast, following a libzmq:zmq_connect[3], the socket enters the \fIready\fR state\&.
.sp .5v
.RE
.SH "RETURN VALUE"
.sp
The \fIzmq_bind()\fR function returns zero if successful\&. Otherwise it returns \-1 and sets \fIerrno\fR to one of the values defined below\&.
.SH "ERRORS"
.PP
\fBEINVAL\fR
.RS 4
The endpoint supplied is invalid\&.
.RE
.PP
\fBEPROTONOSUPPORT\fR
.RS 4
The requested
\fItransport\fR
protocol is not supported\&.
.RE
.PP
\fBENOCOMPATPROTO\fR
.RS 4
The requested
\fItransport\fR
protocol is not compatible with the socket type\&.
.RE
.PP
\fBEADDRINUSE\fR
.RS 4
The requested
\fIaddress\fR
is already in use\&.
.RE
.PP
\fBEADDRNOTAVAIL\fR
.RS 4
The requested
\fIaddress\fR
was not local\&.
.RE
.PP
\fBENODEV\fR
.RS 4
The requested
\fIaddress\fR
specifies a nonexistent interface\&.
.RE
.PP
\fBETERM\fR
.RS 4
The 0MQ
\fIcontext\fR
associated with the specified
\fIsocket\fR
was terminated\&.
.RE
.PP
\fBENOTSOCK\fR
.RS 4
The provided
\fIsocket\fR
was invalid\&.
.RE
.PP
\fBEMTHREAD\fR
.RS 4
No I/O thread is available to accomplish the task\&.
.RE
.SH "EXAMPLE"
.PP
\fBBinding a publisher socket to an in-process and a TCP transport\fR. 
.sp
.if n \{\
.RS 4
.\}
.nf
/* Create a ZMQ_PUB socket */
void *socket = zmq_socket (context, ZMQ_PUB);
assert (socket);
/* Bind it to a in\-process transport with the address \*(Aqmy_publisher\*(Aq */
int rc = zmq_bind (socket, "inproc://my_publisher");
assert (rc == 0);
/* Bind it to a TCP transport on port 5555 of the \*(Aqeth0\*(Aq interface */
rc = zmq_bind (socket, "tcp://eth0:5555");
assert (rc == 0);
.fi
.if n \{\
.RE
.\}
.sp
.SH "SEE ALSO"
.sp
\fBzmq_connect\fR(3) \fBzmq_socket\fR(3) \fBzmq\fR(7)
.SH "AUTHORS"
.sp
This page was written by the 0MQ community\&. To make a change please read the 0MQ Contribution Policy at \m[blue]\fBhttp://www\&.zeromq\&.org/docs:contributing\fR\m[]\&.