Invalid argument (session_base.cpp:490)

[a5-pickle]

Hi. I'm trying to write a simple client listening to an epgm channel. But when I execute the code, I get the following error:

Invalid argument (session_base.cpp:490)
signal: aborted (core dumped)

When I add the line:

msg, _ := socket.Recv(0)

Am I establishing the context and socket correctly? Any ideas on how I can begin debugging this?

Here is my code:

package main

import (
    "fmt"
    zmq "github.com/pebbe/zmq3"
)

func main() {
    context, _ := zmq.NewContext()
    socket, _ := context.NewSocket(zmq.SUB)

    err := socket.Connect("epgm://address")
    if err != nil {
        panic(err.Error())
    }
    socket.SetSubscribe("")

    msg, _ := socket.Recv(0)

    fmt.Println(msg)

    socket.Close()
    context.Term()
}

Thanks for reading.
Karl

[pebbe]

I can't reproduce this. I get "protocol not supported". What version of ZeroMQ are you using?

[a5-pickle]

I'm using 3.2.4. But to resolve the protocol not supported error, you need to install zeromq after running:

./configure --with-pgm=libpgm-5.1.118~dfsg

What that does is point the install script to a tar file in foreign/openpgm in your source folder (5.1.118 is what is included with the 3.2.4 distribution).

When I have time today I'm going to try to reproduce this error with zeromq version 4.0.4 using your zmq4 library.

[pebbe]

I compiled with --with-pgm, and now I get panic: invalid argument

[a5-pickle]

Ah, that's because you need to put in a valid address (for example: epgm://eth0;224.0.0.1:5555)

[pebbe]

Now the program just hangs

[a5-pickle]

Hey. So I tried to do some research on the issue... it seems like a libzmq bug for epgm channels. I installed zeromq version 4.0.4 and I got the following fault:

Invalid argument (session_base.cpp:538)
signal: aborted (core dumped)

Searching for this error online led me to this: zeromq/libzmq#784

It's been an issue since end of 2013... not sure if it's actually being looked into. I think it's fine to close this issue as it's not related to any of the stuff you built. Thanks for looking into it.