Hi,

I had noticed that selecting or excluding processes without a
controlling terminal doesn't work in procps on Cygwin.

For example, the mintty process shouldn't appear in the following, as
the 'f' (for forest) argument triggers procps's "BSD personality",
where processes without a controlling terminal are supposed to be
excluded by default:

$ procps f
    PID TTY    STAT  STIME COMMAND
   1809 ?      Ss    19:49 /usr/bin/mintty -
   1810 pty0   Ss    19:49  \_ -zsh
   2075 pty0   R     21:14      \_ procps f

Similarly, this should list the processes without a terminal, but
comes up empty:

$ procps -t -

I tracked this down to a difference in the tty field of /proc/*/stat
(which is the 7th field). On Linux, processes without a terminal have
value 0 there, and that's what procps expects.

Cygwin 3.3 has -1 instead, whereas on master the bits of the tty field
were rearranged in commit 437d0a8f88, which turns the -1 into
268435455 (i.e. 0xFFFFFFF). Either way, procps treats such processes
as having terminals. (The ? in the TTY column output is generated by a
different code path in procps that uses /proc/*/ctty on Cygwin.)

Patches for the 3.3 branch and master attached.

Regards,
Andy