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From: "Dave Korn" <dave DOT korn AT artimi DOT com>
To: <cygwin AT cygwin DOT com>
Subject: RE: signal handler and JNI
Date: Mon, 20 Feb 2006 14:51:51 -0000
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On 20 February 2006 14:33, Alex Dupre wrote:

> Hello,
> I have a question about signal handling and JNI under cygwin.
> 
> The scenario is the following:
> - a cygwin program register a function to handle SIGINT and SIGTERM signals
> - the program then launches the Java Virtual Machine via the JNI
> invocation API, telling it to not override any signal handlers
> 
> Hitting a CTRL-C should then immediately run the defined signal handler,
> but this is not the case. For some reason (what exactly?) inside the
> java program I need to periodically call a native function linked with
> cygwin, but this is not enough. In the called function I have to do
> something more, like printing a char to stdout or /dev/null (calling
> printf("") with an empty string doesn't work). Only in this way the
> signal handler is called as soon as I hit CTRL-C, otherwise it's ignored
> or handled seconds/minutes later.
> Maybe the callback to C code is mandatory under cygwin, but why should I
> print something to have to signal handled? Any suggestions?
> 
> --
> Alex Dupre


  Well, have you read the internals doc about how signals work?

http://cygwin.com/cgi-bin/cvsweb.cgi/~checkout~/src/winsup/cygwin/how-signals-
work.txt?rev=1.14&content-type=text/plain&cvsroot=src



    cheers,
      DaveK
-- 
Can't think of a witty .sigline today....


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