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From: Ken Brown <kbrown@cornell.edu>
To: "cygwin@cygwin.com" <cygwin@cygwin.com>
Subject: Re: ssh-agent doesn't die
Date: Fri, 27 Sep 2019 14:12:34 +0000
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On 9/27/2019 9:37 AM, Norton Allen wrote:
> On 9/26/2019 10:50 PM, Ken Brown wrote:
>>
>>> As a simple test example, consider:
>>>
>>> /bin/ssh-agent /bin/sleep 10
>>>
>>> While the sleep is still running, ps shows:
>>>
>>>         PID    PPID    PGID     WINPID   TTY         UID    STIME COMMAND
>>>        1694    1693    1694       1576  ?          22534 00:01:10 
>>> /usr/bin/ssh-agent
>>>        1653       1    1653      11740  cons1      22534 00:00:37 /usr/bin/bash
>>>        1693    1653    1693       1552  cons1      22534 00:01:10 /usr/bin/sleep
>>>
>>> One oddity is that ssh-agent is listed as a subprocess of sleep
>> ...but this isn't a bug.  ssh-agent forks, and then the parent execs the command.
> 
> With the salient difference presumably being that the exec is done in the parent 
> instead of the child as usual?

Yes.  The idea is that 'ssh-agent command' should be more-or-less equivalent to 
running 'command', with ssh-agent running as a subprocess.

The ssh-agent subprocess periodically checks to see if its parent is still 
alive, and it exits when the parent has died.  Someone should figure out why 
this is not working on Cygwin.

Ken

Ken

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