About "defunct" processes

About "defunct" processes

[Angelo Graziosi]

Perhaps this has been flagged or probably it is matter I don't 
understand, but I am seeing some "defunct" process with ps command.

The following occurs on Cygwin64 (I don't have Cygwin32 any more).

Suppose I start mintty with the link created by its installation. 
Suppose I create another mintty window with ALT-F2 from the first. ps shows:

$ ps
       PID    PPID    PGID     WINPID   TTY     UID    STIME COMMAND
      2648       1    2648       2648  ?       1001 12:01:38 /usr/bin/mintty
      3724    2648    3724       2012  pty0    1001 12:01:38 /usr/bin/bash
      1904    2648    2648       1760  ?       1001 12:01:41 /usr/bin/mintty
I    1604    1904    1604        768  pty1    1001 12:01:41 /usr/bin/bash
      3776    3724    3776       2016  pty0    1001 12:02:03 /usr/bin/ps


ant its seems OK.

Suppose, now, I close the second mintty window (clicking the window "x" 
button). ps shows:

$ ps
       PID    PPID    PGID     WINPID   TTY     UID    STIME COMMAND
      2648       1    2648       2648  ?       1001 12:01:38 /usr/bin/mintty
      3724    2648    3724       2012  pty0    1001 12:01:38 /usr/bin/bash
      3176    3724    3176       3832  pty0    1001 12:02:14 /usr/bin/ps
      1904    2648    2648       1760  ?       1001 12:01:41 
/usr/bin/mintty <defunct>


Why that "defunct" process? I don't remember having seen that before on 
my old Cygwin32 installation.


Ciao,
Angelo.

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Re: About "defunct" processes

[Kurt Franke]

Angelo Graziosi <angelo.graziosi <at> alice.it> writes:


> $ ps
>        PID    PPID    PGID     WINPID   TTY     UID    STIME COMMAND
>       2648       1    2648       2648  ?       1001 12:01:38 /usr/bin/mintty
>       3724    2648    3724       2012  pty0    1001 12:01:38 /usr/bin/bash
>       3176    3724    3176       3832  pty0    1001 12:02:14 /usr/bin/ps
>       1904    2648    2648       1760  ?       1001 12:01:41 
> /usr/bin/mintty <defunct>
> 
> Why that "defunct" process? I don't remember having seen that before on 
> my old Cygwin32 installation.

Hi,

it looks like the cygwin process handling becomes more unix like :-)

in unix exach process has an entry in the process list unless its parent
has do a wait call on it to get the information abouit process termination.

if the parent process teminates the init process will become the new parent
and will do this wait if not already done





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Re: About "defunct" processes

[Christopher Faylor]

On Tue, Mar 11, 2014 at 12:26:45PM +0000, Kurt Franke wrote:
>Angelo Graziosi <angelo.graziosi <at> alice.it> writes:
>
>
>> $ ps
>>        PID    PPID    PGID     WINPID   TTY     UID    STIME COMMAND
>>       2648       1    2648       2648  ?       1001 12:01:38 /usr/bin/mintty
>>       3724    2648    3724       2012  pty0    1001 12:01:38 /usr/bin/bash
>>       3176    3724    3176       3832  pty0    1001 12:02:14 /usr/bin/ps
>>       1904    2648    2648       1760  ?       1001 12:01:41 
>> /usr/bin/mintty <defunct>
>> 
>> Why that "defunct" process? I don't remember having seen that before on 
>> my old Cygwin32 installation.
>
>Hi,
>
>it looks like the cygwin process handling becomes more unix like :-)

Right.  It's a new feature that I implemented sometime around 1998 or so.

cgf

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