Re: [JSch-users] Backgrounding stops in JSCH

[<ym...@jc...>]

Hi,

   +-From: "Bernstein, Brian J" <Bri...@le...> __
   |_Date: Wed, 15 Jan 2003 11:05:41 -0500 ____________________
   |
    >> Hello, I'm trying to track down a problem that I am fairly
    >> certain exists due to JSCH.
    >> 
    >> However, if I run the launching process backgrounded (even
    >> nohup'd), at some point in JSCH's work it causes the background
    >> process to stop. Not a freeze in the code, but "[1]+ Stopped -
    >> launcherProcess" type stop which from my experience happens
    >> when a background program tries to grab STDIN.  If I let the
    >> program run in foreground, it works perfectly. No, I do not
    >> touch STDIN anywhere, and my output is either via Tibco or
    >> log4j.

You are right. STDIN will be grabbed, because System.{in,out} are plugged 
to a remote process by the default.

So, the followings will solve your problem

    >> com.jcraft.jsch.Channel channel = session.openChannel("exec");
    >> ((ChannelExec) channel).setCommand(cmd);
    >> channel.setXForwarding(false);

      PipedOutputStream out=new PipedOutputStream();
      channel.setInputStream(new PipedInputStream(out));
      PipedInputStream in=new PipedInputStream();
      channel.setOutputStream(new PipedOutputStream(in));

    >> channel.connect();
    >> 
    >> successFlag = true;

From my carelessness, you can not write as follows in current release,
      channel.setInputStream(null);
      channel.setOutputStream(null);
but you will be able to do in the next release.

Thanks,
--
ymnk