Under OS-X, I've got process named 'listener' that is waiting on 'accept' to read data from local unix socket named listener_socket. unfortunately, any attempt to connect that socket terminate in 'connection refused' error.
Using lsof, to make sure that the 'listener' actually listen to this socket :
sudo lsof -p 570
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
...
listener 570 root 3u unix 0x48a2751a1bad61ef 0t0 /private/var/run/my_sockets/listener_socket
Notice that the file is, in fact, a valid unix socket :
file /private/var/run/my_sockets/listener_socket /private/var/run/my_sockets/listener_socket: socket
However, it still fail to connect, even when i'm using an alternative way from command like (using socat command)
sudo socat LOCAL:/private/var/run/my_sockets/listener_socket,interval=1 EXEC:'aaaaaaaaaaaaaaaaa',nofork
2015/11/23 00:57:33 socat[928] E connect(3, LEN=49 AF=1 "/private/var/run/my_sockets/listener_socket", 49): Connection refused
perhaps there are more i can do to figure out why i cannot send data to the socket, even-though it's obvious that 'listener' waiting for this data on the other side ?
here's the relevant part of my code :
sender:
sockfd = socket(PF_UNIX, SOCK_STREAM, 0);
address.sun_family = AF_UNIX;
snprintf(address.sun_path, UNIX_PATH_MAX, "%s", LISTENER_SOCKET_PATH);
connect(sockfd, (struct sockaddr *) &address, sizeof(struct sockaddr_un)
write ...
receiver:
fd = socket(PF_UNIX, SOCK_STREAM, 0);
unlink(sock_name); // in case the socket is used before
listen(server->fd, 5); // we don't reach 5 listeners for sure ...
chmod(sock_name, mode); // giving root privilages
accept(server->fd, (struct sockaddr *) &server->address, &server->address_length);
read ...
thanks
The server seems to miss calling bind()
on the listening socket.