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List:       apache-modules
Subject:    Re: [apache-modules] Getting APR_POLLIN even on connection hangups
From:       Christian Parpart <cparpart () surakware ! net>
Date:       2003-12-17 12:39:23
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On Wednesday 17 December 2003 7:56 am, Abdul Mujeer Kapadia wrote:
> Hi,
>
> I am writing an Apache module using polling on a socket. 

what socket are you talking about? the client socket you can get from the 
client request (somehow)?

> I am using a 
> technique derived from mod_proxy_connect. The issue in this technique is
> that I am getting APR_POLLIN even when the connection is deliberately
> dropped (using telnet to connect and then Ctrl+C to terminate). This puts
> module into an infinite loop where it continously gets an APR_SUCCESS from
> apr_poll and then gets an APR_POLLIN event. What it should get is an
> APR_POLLHUP event or atleast APR_POLLERR to break the loop properly. Am I
> doing something wrong here or what?
>
> Any suggestion/ideas are welcome.

POLLIN is also an event for connection closed, and what you read from the 
client is EOF (or "nothing"), that is, a read(client_fd, buf, sizeof(buf) 
would always return 0, e.g.

[....]
>    if (pollevent & APR_POLLIN) {

        if (read(client_socket, your_buf, your_buf_len) == 0)
            break;

        // other stuff....

>    }

Greets,
Christian Parpart.

- -- 
 13:31:53 up 71 days, 23:26,  1 user,  load average: 0.10, 0.07, 0.14
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