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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