Messages in this thread | | | Date | Fri, 05 Apr 2002 04:04:51 -0800 (PST) | Subject | Re: socket write(2) after remote shutdown(2) problem ? | From | "David S. Miller" <> |
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From: Stelian Pop <stelian.pop@fr.alcove.com> Date: Fri, 5 Apr 2002 14:00:55 +0200
As you can see, read() doesn't return any error, just 0 to indicate end-of-file (seems correct interpretation of remote shutdown here), but it doesn't report any error from the precedent write... Bug ?
Race, wait a bit, the reset will arrive.
This is a error state in your code, writing when the server expects no data. Always remember that when you are trying to judge if whatever socket operation results is valid or invalid.
Since we find out about the reset asynchronously, this is what happens.
> But all of this is irrelevant. When a server closes and says "send me > no more data", this implies that the server told the client it doesn't > want any more data. Perfectly valid but only if the 'applicative close' has reached the other end. If it's still queued in TCP buffers, the client may not have received yet that close... I thought that this was the only reason that shutdown() existed at all: flush the buffers preparing an imminent close...
Not a close "in TCP" but a close "in your apps protocol". As in:
write(socket_fd, "Ok client I have all your data, lets close now")
See? If the server closes without telling the client that, all bets are off.
Look, your app is buggy, PERIOD. Once you start to write to a closed socket, sorry the phase of the moon decides what happens to you. Most of the time you'll be lucky and see an error. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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