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Date: Mon, 4 Mar 2002 14:10:12 -0500
From: Christopher Faylor <cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: cygwin 1.3.10: kill gives spurious Not owner
Message-ID: <20020304191012.GE14103@redhat.com>
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References: <002301c1c394$f2c00090$dc37500a AT midaskapiti DOT com>
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On Mon, Mar 04, 2002 at 03:54:52PM -0000, Stephen Osborn wrote:
>When using kill I get spurious "Not owner" messages, even though all
>processes (reported by ps) are running as me.
>
>In the mailing list archives the only problems with kill seem to be
>related to killing *other* users' processes.  This is not what I am
>doing.
>
>I am running Cygwin on NT.  Cygcheck o/p at the bottom.
>
>I have a script (A) which runs another script (B) in a separate
>process.  B stores its PID and this is retrieved by the A.  B also runs
>another script (C) in a separate process.
>
>Script A tries to remove all of these processes in a housekeeping
>exercise, by using ps, grep and script B's PID.
>
>This successfully kills script B but on script C a "Not owner" error is
>thrown.
>
>This was working as expected (i.e.  both B & C were killed) but this
>changed a couple of days ago.
>
>I have modified script A to remove the kill command and after the run
>ps gives
>
>      PID    PPID    PGID     WINPID  TTY  UID    STIME COMMAND
>      802       1     802        802  con 1006 14:11:18 /usr/bin/bash
>I     564       1     564        564  con 1006 14:11:40 /usr/bin/bash
>      831       1    1020       1034  con 1006 14:38:57 /usr/bin/sh
>      920     831    1020        920  con 1006   Jan  1 /cygdrive/d/jdk1.3/bin/java
>      682     802     682        571  con 1006 14:44:04 /usr/bin/ps
>
>Issuing kill 920 (=script C) yields
>bash: kill: (920) - Not owner

/cygdrive/d/jdk1.3/bin/java is undoubtedly not a cygwin process so it
doesn't respond to cygwin signals.  This is because recent versions of
/bin/sh now use vfork()/exec() to start processes.  vfork/exec does
not leave an cygwin stub around to deal with signals for non-cygwin
processes.

The work around is to use bash to start the process.

cgf

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