Unix domain socket name in go language

Question

The net package in go provides this function:

func ResolveUnixAddr(net, addr string) (*UnixAddr, error)

The string parameter net gives the network name, "unix", "unixgram" or "unixpacket".

I guess the the network name's meaning as:

unixgram: as type SOCK_DGRAM in socket() function, used by ListenPacket() in net package.
unixpacket: as type SOCK_STREAM in socket() function, used by Listen() in net package.
unix: either

Am I right?

James Henstridge · Accepted Answer · 2014-04-09 10:14:15Z

10

Looking at the unixSocket function in net/unixsock_posix.go, we have:

var sotype int
switch net {
case "unix":
        sotype = syscall.SOCK_STREAM
case "unixgram":
        sotype = syscall.SOCK_DGRAM
case "unixpacket":
        sotype = syscall.SOCK_SEQPACKET
default:
        return nil, UnknownNetworkError(net)
}

So you're right about unixgram being a datagram socket, but it is unix that refers to the the stream type socket and unixpacket refers to a sequential packet socket (i.e. data is sent in packets as with datagram sockets, but they are delivered in order).

edited Apr 9, 2014 at 10:14

answered Apr 9, 2014 at 7:39

James Henstridge

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2 Comments

diabloneo Over a year ago

I find question for SOCK_SEQPACKET.

James Henstridge Over a year ago

Think of SEQPACKET like STREAM, but each recv operation on the socket will correspond to a send from the other end. That is, the write boundaries will be maintained when read by the other party.

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