Example of Creating Socket Server and Client using Go's Stdlib

socket-golang-example.md

Unix domain socket server and client There are three types of unix domain socket.

"unix" corresponds to SOCK_STREAM "unixdomain" corresponds to SOCK_DGRAM "unixpacket" corresponds to SOCK_SEQPACKET When you write a “unix” or “unixpacket” server, use ListenUnix().

 l, err := net.ListenUnix("unix",  &net.UnixAddr{"/tmp/unixdomain", "unix"})
if err != nil {
    panic(err)
}   
defer os.Remove("/tmp/unixdomain")

for {
    conn, err := l.AcceptUnix()
    if err != nil {
        panic(err)
    }
    var buf [1024]byte
    n, err := conn.Read(buf[:])
    if err != nil {
        panic(err)
    }
    fmt.Printf("%s\n", string(buf[:n]));
    conn.Close()
} 

"unixgram" server uses ListenUnixgram().

conn, err := net.ListenUnixgram("unixgram",  &net.UnixAddr{"/tmp/unixdomain", "unixgram"})
if err != nil {
    panic(err)
}   
defer os.Remove("/tmp/unixdomain")

for {
    var buf [1024]byte
    n, err := conn.Read(buf[:])
    if err != nil {
        panic(err)
    }
    fmt.Printf("%s\n", string(buf[:n]));
}

Client is as follows

type := "unix" // or "unixgram" or "unixpacket"
laddr := net.UnixAddr{"/tmp/unixdomaincli", type}
conn, err := net.DialUnix(type, &laddr/*can be nil*/, 
    &net.UnixAddr{"/tmp/unixdomain", type})
if err != nil {
    panic(err)
}   
defer os.Remove("/tmp/unixdomaincli")

_, err = conn.Write([]byte("hello"))
if err != nil {
    panic(err)
}   
conn.Close()