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189 lines
5.6 KiB
189 lines
5.6 KiB
5 years ago
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'\" t
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.\" Title: zmq_tcp
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.\" Author: [see the "AUTHORS" section]
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.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
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.\" Date: 02/18/2017
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.\" Manual: 0MQ Manual
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.\" Source: 0MQ 4.2.2
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.\" Language: English
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.\"
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.TH "ZMQ_TCP" "7" "02/18/2017" "0MQ 4\&.2\&.2" "0MQ Manual"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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zmq_tcp \- 0MQ unicast transport using TCP
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.SH "SYNOPSIS"
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.sp
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TCP is an ubiquitous, reliable, unicast transport\&. When connecting distributed applications over a network with 0MQ, using the TCP transport will likely be your first choice\&.
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.SH "ADDRESSING"
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.sp
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A 0MQ endpoint 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 connect to\&.
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.sp
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For the TCP transport, the transport is tcp, and the meaning of the \fIaddress\fR part is defined below\&.
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.SS "Assigning a local address to a socket"
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.sp
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When assigning a local address to a socket using \fIzmq_bind()\fR with the \fItcp\fR transport, the \fIendpoint\fR shall be interpreted as an \fIinterface\fR followed by a colon and the TCP port number to use\&.
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.sp
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An \fIinterface\fR may be specified by either of the following:
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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The wild\-card
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*, meaning all available interfaces\&.
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.RE
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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The primary IPv4 or IPv6 address assigned to the interface, in its numeric representation\&.
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.RE
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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The non\-portable interface name as defined by the operating system\&.
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.RE
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.sp
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The TCP port number may be specified by:
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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A numeric value, usually above 1024 on POSIX systems\&.
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.RE
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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The wild\-card
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*, meaning a system\-assigned ephemeral port\&.
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.RE
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.sp
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When using ephemeral ports, the caller should retrieve the actual assigned port using the ZMQ_LAST_ENDPOINT socket option\&. See \fBzmq_getsockopt\fR(3) for details\&.
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.SS "Unbinding wild\-card address from a socket"
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.sp
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When wild\-card * \fIendpoint\fR was used in \fIzmq_bind()\fR, the caller should use real \fIendpoint\fR obtained from the ZMQ_LAST_ENDPOINT socket option to unbind this \fIendpoint\fR from a socket using \fIzmq_unbind()\fR\&.
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.SS "Connecting a socket"
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.sp
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When connecting a socket to a peer address using \fIzmq_connect()\fR with the \fItcp\fR transport, the \fIendpoint\fR shall be interpreted as a \fIpeer address\fR followed by a colon and the TCP port number to use\&. You can optionally specify a \fIsource_endpoint\fR which will be used as the source address for your connection; tcp://\fIsource_endpoint\fR;\*(Aqendpoint\*(Aq, see the \fIinterface\fR description above for details\&.
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.sp
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A \fIpeer address\fR may be specified by either of the following:
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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The DNS name of the peer\&.
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.RE
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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The IPv4 or IPv6 address of the peer, in its numeric representation\&.
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.RE
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.sp
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Note: A description of the ZeroMQ Message Transport Protocol (ZMTP) which is used by the TCP transport can be found at \m[blue]\fBhttp://rfc\&.zeromq\&.org/spec:15\fR\m[]
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.SH "EXAMPLES"
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.PP
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\fBAssigning a local address to a socket\fR.
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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// TCP port 5555 on all available interfaces
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rc = zmq_bind(socket, "tcp://*:5555");
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assert (rc == 0);
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// TCP port 5555 on the local loop\-back interface on all platforms
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rc = zmq_bind(socket, "tcp://127\&.0\&.0\&.1:5555");
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assert (rc == 0);
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// TCP port 5555 on the first Ethernet network interface on Linux
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rc = zmq_bind(socket, "tcp://eth0:5555");
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assert (rc == 0);
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.fi
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.if n \{\
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.RE
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.\}
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.PP
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\fBConnecting a socket\fR.
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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// Connecting using an IP address
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rc = zmq_connect(socket, "tcp://192\&.168\&.1\&.1:5555");
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assert (rc == 0);
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// Connecting using a DNS name
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rc = zmq_connect(socket, "tcp://server1:5555");
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assert (rc == 0);
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// Connecting using a DNS name and bind to eth1
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rc = zmq_connect(socket, "tcp://eth1:0;server1:5555");
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assert (rc == 0);
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// Connecting using a IP address and bind to an IP address
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rc = zmq_connect(socket, "tcp://192\&.168\&.1\&.17:5555;192\&.168\&.1\&.1:5555");
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assert (rc == 0);
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.SH "SEE ALSO"
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.sp
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\fBzmq_bind\fR(3) \fBzmq_connect\fR(3) \fBzmq_pgm\fR(7) \fBzmq_ipc\fR(7) \fBzmq_inproc\fR(7) \fBzmq_vmci\fR(7) \fBzmq\fR(7)
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.SH "AUTHORS"
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.sp
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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[]\&.
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