Re: Process ID of Xserver
Re: Process ID of Xserver
- Subject: Re: Process ID of Xserver
- From: robert delius royar <email@hidden>
- Date: Fri, 1 Oct 2004 14:25:00 -0400 (EDT)
- Organization: An Apple OS X end user
- Priority: NEW
Fri, 1 Oct 2004 (09:58 -0700 UTC) Kevin Geiss wrote:
well, 'ps auxwwj' will list all processes along with their parent pids. the X
server should be called 'X11', with the full path:
/Applications/Utilities/X11.app/Contents/MacOS/X11
oddly enough, on my system there were two of them, one was the parent of the
other.
USER PID %CPU %MEM VSZ RSS TT STAT STARTED TIME PPID
PGID SESS JOBC COMMAND
kevin 19006 9.7 2.8 110296 18372 ?? S 9:48AM 0:10.82 19005
16043 172e084 0 /Applications/Utilities/X11.app/Contents/MacOS/X11
-psn_0_13500417 :0
kevin 19005 0.0 0.1 28760 792 ?? S 9:48AM 0:00.03 16043
16043 172e084 0 /Applications/Utilities/X11.app/Contents/MacOS/X11
-psn_0_13500417
Yes, I use this technique:
X11PID=`ps -axw | grep X11.app | grep " :0" | grep -v grep | cut -c 1-5 | head -1`
export X11PID
Only the X11 with the $DISPLAY parameter has a PID that works with
GetProcessForPID(). If I happen to use its parent's PID, the PSN object
comes back as 00000000_00000000.
Is the PID available to clients of the server with a simpel getppid() type
call? Currently my shell script sets the X11PID which I query with getenv()
from C. Then I use the PID to get the PSN for SetFrontProcess(&PSN). It
works, but it seems subject to potential failure, for example if the
$DISPLAY is different.
I also tried
X11PSN=`ps -auxwwj | grep "/Applications/Utilities/X11.app/Contents/MacOS/X11 -psn_" | cut -f 3 -d "_" | head -1`
export X11PSN
which works fine when I try it in bash, but which does not work when run
from the desktop. The X11PID example does work from the desktop.
On Oct 1, 2004, at 8:17 AM, robert delius royar wrote:
Is there a reliable way to get the PID of the Xserver which owns the root
window? Either a shell method or one which runs within a child process
would be OK. I know I can get the parent's PID in a program, but I don't
think I can be sure that that will always be the server. For example the
parent might be an XTerm.
With the PID, I can get the server app's serial number which I can then
use to talk to some of the event manager routines.
--
Dr. Robert Delius Royar Associate Professor of English
Morehead State University Morehead, Kentucky
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