ps does not see all processes if used through a junctioned top level cygwin directory in cmd

ps does not see all processes if used through a junctioned top level cygwin directory in cmd

[Sabuj Pattanayek]

Hi everyone,

I'm experiencing a strange issue where ps does not find all the processes
if it's run from a top level junction to the main cygwin directory in cmd :

On an older windows install I had cygwin under c:\cygwin64 , this time I
used chocolatey to install it and it put it under c:\tools\cygwin. To keep
things consistent so as not to break users I decided to make a junction :

 Directory of C:\

01/04/2018  03:01 PM    <JUNCTION>     cygwin64 [c:\tools\cygwin]

running ps from cygwin works fine :

$ ps -p 6376
      PID    PPID    PGID     WINPID   TTY         UID    STIME COMMAND
     6376       1    6376       5464  pty2      197608 23:52:31
/cygdrive/c/Windows/system32/cmd

however running it from the junctioned top level directory does not work :


C:\>c:\cygwin64\bin\ps -p 6376
c:\cygwin64\bin\ps -p 6376
      PID    PPID    PGID     WINPID   TTY         UID    STIME COMMAND

but when launched via the actual path it works properly :

C:\>c:\tools\cygwin\bin\ps -p 6376
c:\tools\cygwin\bin\ps -p 6376
      PID    PPID    PGID     WINPID   TTY         UID    STIME COMMAND
     6376       1    6376       5464  pty2      197608 23:52:31
/cygdrive/c/Windows/system32/cmd

any ideas what's causing this?

Thanks,
Sabuj

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Re: ps does not see all processes if used through a junctioned top level cygwin directory in cmd

[Andrey Repin]

Greetings, Sabuj Pattanayek!

> Hi everyone,

> I'm experiencing a strange issue where ps does not find all the processes
> if it's run from a top level junction to the main cygwin directory in cmd :

> On an older windows install I had cygwin under c:\cygwin64 , this time I
> used chocolatey to install it and it put it under c:\tools\cygwin. To keep
> things consistent so as not to break users I decided to make a junction :

>  Directory of C:\

> 01/04/2018  03:01 PM    <JUNCTION>     cygwin64 [c:\tools\cygwin]

> running ps from cygwin works fine :

> $ ps -p 6376
>       PID    PPID    PGID     WINPID   TTY         UID    STIME COMMAND
>      6376       1    6376       5464  pty2      197608 23:52:31
> /cygdrive/c/Windows/system32/cmd

> however running it from the junctioned top level directory does not work :


> C:\>c:\cygwin64\bin\ps -p 6376
> c:\cygwin64\bin\ps -p 6376
>       PID    PPID    PGID     WINPID   TTY         UID    STIME COMMAND

> but when launched via the actual path it works properly :

> C:\>c:\tools\cygwin\bin\ps -p 6376
> c:\tools\cygwin\bin\ps -p 6376
>       PID    PPID    PGID     WINPID   TTY         UID    STIME COMMAND
>      6376       1    6376       5464  pty2      197608 23:52:31
> /cygdrive/c/Windows/system32/cmd

> any ideas what's causing this?

I have no idea how did you do it, but I'm unable to see Windows processes like
that without -W.

[]$ ps -p 7636
      PID    PPID    PGID     WINPID   TTY         UID    STIME COMMAND

[]$ ps -Wp 7636
      PID    PPID    PGID     WINPID   TTY         UID    STIME COMMAND
     7636       0       0       7636  ?              0 15:47:38 C:\Program Files\Opera\opera.exe


-- 
With best regards,
Andrey Repin
Thursday, January 25, 2018 20:25:57

Sorry for my terrible english...


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Re: ps does not see all processes if used through a junctioned top level cygwin directory in cmd

[Sabuj Pattanayek]

>
>
> I have no idea how did you do it, but I'm unable to see Windows processes
> like
> that without -W.
>

I'm sshd in. It's like :

cygwin sshd
|_ bash
   |_ cmd

so ps -p works, it's just that it doesn't work properly  unless i use the
actual path to ps from inside cmd which is weird.

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