Am 15.12.2012 11:23, schrieb Denis Loh:
Am 10.12.2012 19:53, schrieb Tommi Mäkitalo:
Am 10.12.2012 09:03, schrieb Denis Loh:
Hi Tommi,
a user reported, that my application crashed, when he tried to open
a stream with his PS3. I googled a bit and found out, that some
clients close the stream disruptively causing the TCP stream to
signal a broken pipe. As most of my clients work fine and I cannot
reproduce this error, I was hopping, that you could help me.
Hi Denis,
you must always call "::signal(SIGPIPE, SIG_IGN);" in your
application. If the peer closes the connection and you try to write
to the socket, your application gets a SIGPIPE. And default action is
to stop the application. If you set the signal handler to SIG_IGN to
ignore the signal, you get just an eof when writing.
The signal is set to SIG_IGN in the http server, jsonrcp server,
binary rpc server and tntnet. But if you just use the network
classes, you have to do it for your own.
A strong advise in the API documentation would be really helpful
(just as a reminder for me).
Tommi
Hi Tommi,
I added the signal handler here:
::signal(SIGPIPE, SIG_IGN);
mApplication.listen(mListenerAddress.c_str(), mListenerPort);
This is right before the application runs the server. However, it does
not work either. Additionally, I saw, that you already ignoring
SIGPIPE signals in Tntnet::run(). Why can those signals still cause
the application to crash? Do I have to put the handler to the components?
Thanks again.
As I can see in your stack trace, this happens in tntnet. And tntnet
sets the signal handler for SIGPIPE. So it shouldn't happen anyway.
Setting the signal handler is global to the process. You do not need to
set it again in your components.
I wonder how the crash can happen. The kernel tells, that it stops the
process since it received a signal SIGPIPE although tntnet told to
ignore that signal by setting the handler to SIG_IGN. I have currently
no idea. Maybe someone else here has a idea?
Tommi
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