[Libwebsockets] Signal Trap eclisping my Trap handler

Shmuel Weiss sweiss at kramerel.com
Wed Nov 16 15:07:43 CET 2016


You're right. 
Thanks.

-----Original Message-----
From: Andy Green [mailto:andy at warmcat.com] 
Sent: Wednesday, November 16, 2016 15:52
To: Shmuel Weiss; libwebsockets at ml.libwebsockets.org
Subject: RE: [Libwebsockets] Signal Trap eclisping my Trap handler



On November 16, 2016 9:47:17 PM GMT+08:00, Shmuel Weiss <sweiss at kramerel.com> wrote:
>And why not doing this in libwebsockets?

'cos lws has *** no requirement on pthreads *** by default?

'cos it's designed to use a serialized event loop and not threads?

-Andy

>http://www.microhowto.info/howto/ignore_sigpipe_without_affecting_other
>_threads_in_a_process.html
>
>Add SIGPIPE to the signal mask using pthread_sigmask
>
>Signals can be temporarily blocked by adding them to the signal mask 
>using the function pthread_sigmask:
>
>sigset_t sigpipe_mask;
>sigemptyset(&sigpipe_mask);
>sigaddset(&sigpipe_mask, SIGPIPE);
>sigset_t saved_mask;
>if (pthread_sigmask(SIG_BLOCK, &sigpipe_mask, &saved_mask) == -1) {
>  perror("pthread_sigmask");
>  exit(1);
>}
>
>Each thread has its own signal mask, so it is safe to do this within a 
>library provided that you restore the mask afterwards. Blocking only 
>defers delivery of the signal, so it remains pending, but for current 
>purposes that will suffice.
>
>-----Original Message-----
>From: Andy Green [mailto:andy at warmcat.com]
>Sent: Wednesday, November 16, 2016 15:46
>To: Shmuel Weiss; libwebsockets at ml.libwebsockets.org
>Subject: Re: [Libwebsockets] Signal Trap eclisping my Trap handler
>
>
>
>On November 16, 2016 9:42:19 PM GMT+08:00, Shmuel Weiss 
><sweiss at kramerel.com> wrote:
>>Hi Andy,
>>
>>We have a trap Handler in our main.cpp which seems to be eclipsed by 
>>the sigtrap of the Libwebsocket,
>>
>>How can we prevent libwebsocket to sigtrap ?
>
>Just reassert your desired user signal handling after lws has created 
>his context.
>
>-Andy
>
>>Thanks.
>>
>>[http://www.kramerelectronics.com/assets/images/signatures/Kramer-logo.
>>png]
>>
>>Shmuel Weiss
>>Kramer Electronics
>>Project Lead and Software Team Leader
>>
>>
>>________________________________
>>Email: sweiss at kramerel.com<mailto:sweiss at kramerel.com>    Web:
>>www.kramerelectronics.com<http://www.kramerelectronics.com/>    Tel:
>>+972-73-2650405
>>Cell: +972-54-3344141    Fax: +972-2-6535369    Address: 3 Am VeOlamo,
>>Jerusalem, 9546303, Israel
>>________________________________
>>
>>
>>
>>
>>
>>
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>>
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