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Date:	Thu, 6 Sep 2001 11:33:17 +0100
From:	"malcolm.boekhoff" <malcolm DOT boekhoff AT actfs DOT co DOT uk>
To:	Cygwin News Group <cygwin AT sources DOT redhat DOT com>
Subject:	How to stop SIGINT being sent to asynchronous, background job?
Message-ID:	<20010906113317.A96@BOEKHOFF_M>
Mime-Version:	1.0

When I start a Java app via:

    nohup ${JAVA} -classpath ${POSEIDON_CLASSPATH} ... org.argouml.application.Main&

and then hit Ctrl-C in the bash window, the Java application terminates
(presumably because SIGINT is propagated to the background, asynchronous
job).

But it doesn't terminate if I hit Ctrl-D, exit.

How can I stop Control-C/interrupt/SIGINT being sent to the Java
application when typed into the bash shell?

Note: I have tried using "disown" already.

You can see from the following that the process groups are different and
according to the manual page, that means that SIGINT shouldn't be
propagated.

..
Thu Sep  6-11:29:26 ~/etc 501$ >/tmp/poseidon.log 2>&1 nohup ${JAVA}
-classpath ${POSEIDON_CLASSPATH} -Xms64m -Xmx96m -Dargo.compiler=javac -
Dsun.java2d.nodraw=true -Dargo.debug=false org.argouml.application.Main&
[1] 136
Thu Sep  6-11:29:29 ~/etc 502$ ps
      PID    PPID    PGID     WINPID  TTY  UID    STIME COMMAND
       96       1      96         96  con 11878 10:05:41 /usr/local/bin/mutt
      198      96      96        243  con 11878 11:20:50 /usr/bin/sh
      264     198      96        264  con 11878 11:20:50 /c/WINNT/system32/cmd
      213       1     213        213  con 11878 11:28:36 /usr/bin/bash
      136     213     136        250  con 11878 11:29:29 /d/jdk1.3/bin/java
      255     213     255        226  con 11878 11:29:50 /usr/bin/ps
Thu Sep  6-11:29:50 ~/etc 503$ disown
Thu Sep  6-11:29:54 ~/etc 504$ ps
      PID    PPID    PGID     WINPID  TTY  UID    STIME COMMAND
       96       1      96         96  con 11878 10:05:41 /usr/local/bin/mutt
      198      96      96        243  con 11878 11:20:50 /usr/bin/sh
      264     198      96        264  con 11878 11:20:50 /c/WINNT/system32/cmd
      213       1     213        213  con 11878 11:28:36 /usr/bin/bash
      136     213     136        250  con 11878 11:29:29 /d/jdk1.3/bin/java
      245     213     245        226  con 11878 11:29:55 /usr/bin/ps
Thu Sep  6-11:29:56 ~/etc 505$ jobs
Thu Sep  6-11:30:26 ~/etc 506$ jobs -l
Thu Sep  6-11:30:31 ~/etc 507$ jobs -p
Thu Sep  6-11:30:34 ~/etc 508$ ps
      PID    PPID    PGID     WINPID  TTY  UID    STIME COMMAND
       96       1      96         96  con 11878 10:05:41 /usr/local/bin/mutt
      198      96      96        243  con 11878 11:20:50 /usr/bin/sh
      264     198      96        264  con 11878 11:20:50 /c/WINNT/system32/cmd
      213       1     213        213  con 11878 11:28:36 /usr/bin/bash
      136     213     136        250  con 11878 11:29:29 /d/jdk1.3/bin/java
      247     213     247        257  con 11878 11:30:41 /usr/bin/ps
Thu Sep  6-11:30:41 ~/etc 509$ exit
                               ^^^^^^^ Typing Control-D does not
                               terminate the asynchronous process.

Thu 06/09/2001 11:30:45.41 E:\mcb\act\etc>bash
Thu Sep  6-11:30:47 ~/etc 501$ jobs
Thu Sep  6-11:30:49 ~/etc 502$ ps
      PID    PPID    PGID     WINPID  TTY  UID    STIME COMMAND
       96       1      96         96  con 11878 10:05:41 /usr/local/bin/mutt
      198      96      96        243  con 11878 11:20:50 /usr/bin/sh
      264     198      96        264  con 11878 11:20:50 /c/WINNT/system32/cmd
      136       1     136        250  con 11878 11:29:29 /d/jdk1.3/bin/java
      222       1     222        222  con 11878 11:30:47 /usr/bin/bash
      269     222     269        247  con 11878 11:30:53 /usr/bin/ps
Thu Sep  6-11:30:53 ~/etc 503$
Thu Sep  6-11:30:54 ~/etc 503$
                              ^^^^^^^^ Typing Control-C terminates
                              poseidon Java app.

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