[Mono-dev] Socket.Accept() causes [1]+ Stopped

[Robert Jordan]

On 27.09.2011 15:28, DJL wrote:
> Hi everyone, first post on here.
>
> I'm getting a bizzarre behaviour and I'm hoping you guys can help.
> Sorry if this is the wrong place to post this.
>
> Short version:
> Calling Socket.Accept() is causing my application to freeze. A commandline
> "fg" resumes it.

It's not your application that freezes. You seem to be invoking
bash and some tool that sends SIGTSTP to itself. SIGTSTP is used
when an application/command requires a terminal for user input,
e.g. password input.

Robert

>
> Long version:
> Ok so I have a multi-threaded, Multi DLL  application.
> Several of these DLLs are calling Socket.Accept() without issue.
> However the newest of these is causing the application to stop every time.
> The commandline shows "[1]+  Stopped" and no other output.
> typing "fg" causes the application to continue as if nothing happened.
>
> Here is an excerpt from my code:
>
> /
> Log(9, "pcsBash.Start()");
> pcsBash.Start();
> Log(9, "<");
> stStdIn = pcsBash.StandardInput.BaseStream;
> stStdErr = pcsBash.StandardOutput.BaseStream;
> Log(9, "Accept()");
> sktStdOut = sktStdOutListen.Accept();
> Log(9, "<");
> stStdOut = new System.Net.Sockets.NetworkStream(sktStdOut, true);
> Log(9, "<");/
>
>
> Looking in the log when it stops (before typing fg) the last entry is
> "Accept()"
> (And yes the log is being flushed after each line).
>
> It is always in this same place, which leads me to suspect it is NOT one of
> the other threads causing this.
>
> Anyone have any ideas what could possibly cause this?
>
> Incidentally - the same code running on Windows in Microsoft's .Net does not
> do anything out of the ordinary - although I imagine if it did the symptoms
> might be quite different?
>
> Once again, thanks for any help you can give on this baffling issue
>
> System info:
>
> /#mono --version
> Mono JIT compiler version 2.8.2 (tarball Wed Feb 23 09:31:21 UTC 2011)
> Copyright (C) 2002-2010 Novell, Inc and Contributors. www.mono-project.com
>          TLS:           __thread
>          SIGSEGV:       altstack
>          Notifications: epoll
>          Architecture:  amd64
>          Disabled:      none
>          Misc:          debugger softdebug
>          LLVM:          supported, not enabled.
>          GC:            Included Boehm (with typed GC and Parallel Mark)
> #uname -a
> Linux svn 2.6.37.6-0.7-desktop #1 SMP PREEMPT 2011-07-21 02:17:24 +0200
> x86_64 x86_64 x86_64 GNU/Linux
> /
>
>
> --
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