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94 lines
2.6 KiB
Plaintext
94 lines
2.6 KiB
Plaintext
zmq_tcp(7)
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==========
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NAME
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----
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zmq_tcp - 0MQ unicast TCP transport over the network
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SYNOPSIS
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--------
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TCP is an ubiquitous unicast transport. When connecting distributed
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applications, you will mostly use TCP transport.
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CONNECTION STRING
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-----------------
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Connection string for TCP transport is "tcp://" followed by an IP address,
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colon and port number. IP address can be either its numeric representation,
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a NIC name or a hostname (resolved by DNS):
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----
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tcp://192.168.0.111:5555
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tcp://myserver001:80
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tcp://lo:32768
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----
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Note that NIC names are not standardised by POSIX. They tend to be rather
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arbitrary and platform dependent. Say, "eth0" on Linux would correspond to "en0"
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on OSX and "e1000g" on Solaris. On Windows platform, as there are no short NIC
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names available, you have to use numeric IP addresses instead.
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WIRE FORMAT
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-----------
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A message consists of a message length followed by message data.
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Size of message data MUST correspond to the message length.
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For messages of 0 to 254 octets, the length is represented by single octet.
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For messages of 255 or more octets the length is represented by a single octet
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%xFF followed by a 64-bit unsigned integer length in network byte order.
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The protocol can be defined by this BNF grammar:
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----
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frame = length data
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length = OCTET | escape 8*OCTET
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escape = %xFF
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data = *OCTET
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----
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Binary layout of a message (up to 254 bytes long):
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----
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Message size | Message body ... |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Message body ...
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+-+-+-+-+-+-+- ...
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----
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Binary layout of a larger message:
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----
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 0xff | Message size ... |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Message size ... |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Message size | Message body ... |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Message body ...
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+-+-+-+-+-+-+-+ ...
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----
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SEE ALSO
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--------
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linkzmq:zmq_udp[7]
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linkzmq:zmq_pgm[7]
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linkzmq:zmq_ipc[7]
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linkzmq:zmq_inproc[7]
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AUTHOR
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------
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Martin Sustrik <sustrik at 250bpm dot com>
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