Re: Asynchronous connection to socket always appears to succeed?

Hi Chris,

I can't say I've seen it done that way before but, here are two examples
of what I usually do using connect() or async_connect():

---
Stdio.File sock = Stdio.File();

int main() {
    int r = sock->connect("127.0.0.1", 23);
    if (!r) {
        werror("error: %s\n", strerror(sock->errno()));
        return 1;
    }

    sock->set_nonblocking(sockread, sockwrite, sockclose);

    // ...

    return -1;
}

---
Or with async_connect() to prevent blocking main() while connecting:
---

Stdio.File sock = Stdio.File();

int main() {
    sock->async_connect("127.0.0.1", 23, sockconnect);
    return -1;
}

void sockconnect(int ok) {
    if (ok) {
        write("Connected!\n");
        sock->set_nonblocking(sockread, sockwrite, sockclose);

        // ...

    }
    else {
        werror("Connection failed!\n");
        exit(1);
    }
}
---

Best regards,
Pontus Rodling

On 07/22/2015 12:47 PM, Chris Angelico wrote:
> Pike 8.1 on Linux.
>
> The following script ought to come through to connfailed() in the
> event that there is no TELNET server on localhost. Instead, it comes
> through to connected(), then afterward to sockclosed(). Am I doing
> something stupidly wrong with asynchronous connections here?
>
> object sock;
>
> void sockread(mixed dummy,string data) {write("Data received: %O\n",data);}
> void sockwrite() {write("Socket available for writing\n");}
> void sockclosed() {write("Socket closed, terminating.\n"); exit(0);}
>
> void connected()
> {
>     write("Connection appears successful [errno is %d]\n",sock->errno());
>     sock->set_nonblocking(sockread,sockwrite,sockclosed);
> }
>
> void connfailed()
> {
>     write("Error connecting: %s [%d]\n",strerror(sock->errno()),sock->errno());
>     sock->close();
>     sockclosed();
> }
>
> int main()
> {
>     sock=Stdio.File(); sock->open_socket();
>     sock->set_nonblocking(0,connected,connfailed);
>     sock->connect("127.0.0.1",23);
>     return -1;
> }
>
> ChrisA
>