Thx when looking for Recv() and Send() I found this package https://pkg.go.dev/golang.org/x/sys/unix
I don't understand how I'm suppose to create a new SockaddrUnix when raw is a private field? https://play.golang.org/p/fe1f_A92BgI Also don't know if my strcpy is the way to fill in path? On Saturday, February 15, 2020 at 4:31:00 PM UTC+1, Robert Engels wrote: > > You want to use Recv() and Send() not Read() and Write() in order to get > the address information. > > Read() and Write() are for connected sockets and usually streaming. > > On Feb 15, 2020, at 9:27 AM, Robert Engels <ren...@ix.netcom.com > <javascript:>> wrote: > > > Sorry. I missed the part about “domain” socket. > > On Feb 15, 2020, at 9:26 AM, Robert Engels <ren...@ix.netcom.com > <javascript:>> wrote: > > > See github.com/robaho/go-trader for an example of sending / receiving udp > traffic. There’s no reason to use the low level Unix interfaces. > > On Feb 15, 2020, at 9:22 AM, Gert <gert....@gmail.com <javascript:>> > wrote: > > > Hi, leaving out a lot of details I basically do this in a C client > > fd = socket(PF_UNIX, SOCK_DGRAM, 0) > bind(fd, (struct sockaddr*) &client, sizeof(struct sockaddr_un) > connect(fd, (struct sockaddr*) &server, sizeof(struct sockaddr_un) > send(fd, buff, strlen(buff)+1, 0) > recv(fd, buff, 8192, 0) > > Which means I have a client socket where I receive datagrams and a server > socket where I sent datagrams to. > > It works in my C client above but having troubles understanding how to > talk to the same C server using a Go client instead. This is my attempt > > > addr, err := net.ResolveUnixAddr("unixgram", "client.sock") > if err != nil { > log.Fatal(err) > } > > client, err := net.ListenUnixgram("unixgram", addr) > if err != nil { > log.Fatal(err) > } > defer client.Close() > > server, err := net.Dial("unixgram", "server.sock") > if err != nil { > log.Fatal(err) > } > defer server.Close() > > _, err = server.Write([]byte("hi")) > if err != nil { > log.Fatal(err) > } > > buf := make([]byte, 1024) > n, err := client.Read(buf[:]) > if err != nil { > println(err) > } > println(string(buf[0:n])) > > if err := os.RemoveAll("client.sock"); err != nil { > log.Fatal(err) > } > > > What happens in the Go implementation is that it successfully send a > datagram, the server receives it but then the server can't figure out where > to send a answer back with a error from the server sendto: `No such file or > directory` > > This is basically what the the C server code is doing. > > recvfrom(fd, buff, 8192, 0, (struct sockaddr*) &client, &len) > sendto(fd, buff, strlen(buff)+1, 0, (struct sockaddr*) &client, len) > > My socket knowledge is limited and https://golang.org/pkg/net/ is > overwhelming, if I would make a guess is that de C client shares fd between > bind and connect and my Go implementation doesn't ? > > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golan...@googlegroups.com <javascript:>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/644fa128-96c9-47f8-abc5-5fcc19d01e6e%40googlegroups.com > > <https://groups.google.com/d/msgid/golang-nuts/644fa128-96c9-47f8-abc5-5fcc19d01e6e%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/5d98b413-850f-4937-b8f8-1ad0d28aadf7%40googlegroups.com.
