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• How to detect defunct processes on Linux?

  - by Hakan

  I have a parent and a child process written in C language. Somewhere in the parent process HUP signal is sent to the child. I want my parent process to detect if the child is dead. But when I send SIGHUP, the child process becomes a zombie. How can I detect if the child is a zombie in the parent process? I try the code below, but it doesn't return me the desired result since the child process is still there but it is defunct. kill(childPID, 0); One more question; can I kill the zombie child without killing the parent? Thanks.

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• Python's subprocess.Popen object hangs gathering child output when child process does not exit

  - by Daniel Miles

  When a process exits abnormally or not at all, I still want to be able to gather what output it may have generated up until that point. The obvious solution to this example code is to kill the child process with an os.kill, but in my real code, the child is hung waiting for NFS and does not respond to a SIGKILL. #!/usr/bin/python import subprocess import os import time import signal import sys child_script = """ #!/bin/bash i=0 while [ 1 ]; do echo "output line $i" i=$(expr $i \+ 1) sleep 1 done """ childFile = open("/tmp/childProc.sh", 'w') childFile.write(child_script) childFile.close() cmd = ["bash", "/tmp/childProc.sh"] finish = time.time() + 3 p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE) while p.poll() is None: time.sleep(0.05) if finish < time.time(): print "timed out and killed child, collecting what output exists so far" out, err = p.communicate() print "got it" sys.exit(0) In this case, the print statement about timing out appears and the python script never exits or progresses. Does anybody know how I can do this differently and still get output from my child processe

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• Killing HTML nodes from shell

  - by hendry

  Need a solution to kill nodes like <footer>foobar</footer> and <div class="nav"></div> from many several HTML files. I want to dump a site to disk without the menus and footers and what not. Ideally I would accomplish this task using basic unix tools like sed. Since it's not XML I can't use xmlstarlet. Could anyone please suggest recipes, so I can ideally have a script running kill-node.sh 'div class="toplinks"' *.html to prune the bits I don't want. Thank you,

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• Release another user's lock obtained with sp_getapplock on SQL Server

  - by joshperry

  We have a system that uses sp_getapplock to create an exclusive mutex any time someone opens an order in the GUI. This is used to prevent multiple people from making changes to an order simultaneously. Sometimes people will open an order and go home, leaving it open. This effectively blocks anyone from being able to make changes to the order. I then get emails, calls and end up doing a kill <spid> in enterprise manager. Obviously I've gotten sick of this and want to make a quick self-service webform. The main problem I've run into is that kill requires sysadmin privileges, which I do not want to give to the user that the our website runs as. I have tried sp_releaseapplock but this doesn't let you release another user's lock (even when calling it as a sysadmin). So, finally my question; does anyone know of an alternative method to release a lock that was obtained by another user using sp_getapplock?

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• Android process killer

  - by Martin

  I have similar question, maybe you can help. Is it possible to get list of all process which are running in the Android system, and kill some of them? I know that there are some applications (task managers), but I would like to write my own, simple application. I would like to write simple task manager, just list of all process and button which will kill some of them. Could you just write some Java methods which I can call in order to get list of process, and method for killing them. Or just give me some advices. Thanks for answers. Regards Martin

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• android content provider robustness on provider crash

  - by user1298992

  On android platforms (confirmed on ICS), if a content provider dies while a client is in the middle of a query (i.e. has a open cursor) the framework decides to kill the client processes holding a open cursor. Here is a logcat output when i tried this with a download manager query that sleeps after doing a query. The "sleep" was to reproduce the problem. you can imagine it happening in a regular use case when the provider dies at the right/wrong time. And then do a kill of com.android.media (which hosts the downloadProvider). "Killing com.example (pid 12234) because provider com.android.providers.downloads.DownloadProvider is in dying process android.process.media" I tracked the code for this in ActivityManagerService::removeDyingProviderLocked Is this a policy decision or is the cursor access unsafe after the provider has died? It looks like the client cursor is holding a fd for an ashmem location populated by the CP. Is this the reason the clients are killed instead of throwing an exception like Binders when the server (provider) dies ?

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• Code Signing Services

  - by bogdan

  I'm developing a System Preference Pane that runs a background application. I'm planning on codesigning the background application and I'll be using the kill flag of codesign (http://gemma.apple.com/mac/library/documentation/Darwin/Reference/ManPages/man1/codesign.1.html). From my understanding, this kill flag will not allow the background application to be run if it's signature doesn't match. My problem with this approach is that it doesn't provide any feedback to the user and, for somewhat reason, the application gets corrupted, it will refuse to launch without any information. I'd like to use the Code Signing Service from the System Preference Pane to check the validity of the background application. However, I couldn't find how to use it to check the validity of an external file. Is this possible using the Code Signing Service or should I NSTask codesign directly? My application is targeted for 10.6 so it doesn't matter which I use. Thank you!

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• What happens to stderr/stdout streams after Process#destroy() in Java?

  - by Lajos Nagy

  Here's my problem. I'd like to have a timeout for a process I start from Java. After the timeout, I'd like to kill the process. So far, so good. Problem is, I want to capture stderr/stdout during both normal execution and after a timeout. What happens if I kill the process with destroy()? Can I retrieve the (partial) stderr/stdout produced so far? Or are they gone?

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• idomatic batch processing of text in emacs?

  - by Stephen

  In python, you might do something like fout = open('out','w') fin = open('in') for line in fin: fout.write(process(line)+"\n") fin.close() fout.close() (I think it would be similar in many other languages as well). In emacs lisp, would you do something like (find-file 'out') (setq fout (current-buffer) (find-file 'in') (setq fin (current-buffer) (while moreLines (setq begin (point)) (move-end-of-line 1) (setq line (buffer-substring-no-properties begin (point)) ;; maybe (print (process line) fout) ;; or (save-excursion (set-buffer fout) (insert (process line))) (setq moreLines (= 0 (forward-line 1)))) (kill-buffer fin) (kill-buffer fout) which I got inspiration (and code) from here. Or should I try something entirely different? And how to remove the "" from the print statement? Thanks!

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• How do I execute a shell-command in background?

  - by Adobe

  Here's a simple defun to run a shell script: (defun bk-konsoles () "Calls: bk-konsoles.bash" (interactive) (shell-command (concat (expand-file-name "~/its/plts/goodies/bk-konsoles.bash ") (if (buffer-file-name) (file-name-directory (buffer-file-name))) " &") nil nil)) If I start a program with no ampersand - it start the script, but blocks emacs until I close the program, if I don't put ampersand it gives error: /home/boris/its/plts/goodies/bk-konsoles.bash /home/boris/scl/geekgeek/: exited abnormally with code 1. Edit: So now I'm using: (defun bk-konsoles () "Calls: bk-konsoles.bash" (interactive) (shell-command (concat (expand-file-name "~/its/plts/goodies/bk-konsoles.bash ") (if (buffer-file-name) (file-name-directory (buffer-file-name))) " & disown") nil nil) (kill-buffer "*Shell Command Output*")) Edit 2: Nope - doesn't work: (defun bk-konsoles () "Calls: bk-konsoles.bash" (interactive) (let ((curDir default-directory)) ;; (shell-command (concat "nohup " (expand-file-name "~/its/plts/goodies/bk-konsoles.bash ") curDir) nil nil) (shell-command (concat (expand-file-name "~/its/plts/goodies/bk-konsoles.bash ") curDir "& disown") nil nil) (kill-buffer "*Shell Command Output*"))) keeps emacs busy - either with disown, or nohup. Here's a script I'm running if it might be of help: bk-konsoles.bash

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• Remove another user's lock obtained with sp_getapplock on SQL Server

  - by joshperry

  We have a system that uses sp_getapplock to create an exclusive mutex any time someone opens an order in the GUI. This is used to prevent multiple people from making changes to an order simultaneously. Sometimes people will open an order and go home, leaving it open. This effectively blocks anyone from being able to make changes to the order. I then get emails, calls and end up doing a kill <spid> in enterprise manager. Obviously I've gotten sick of this and want to make a quick self-service webform. The main problem I've run into is that kill requires sysadmin privileges, which I do not want to give to the user that the our website runs as. I have tried sp_releaseapplock but this doesn't let you release another user's lock (even when calling it as a sysadmin). So, finally my question; does anyone know of an alternative method to release a lock that was obtained by another user using sp_getapplock?

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• killall httpd for sleep process

  - by user172697

  Hello guys this shell explain the issue , after executing the .sh file halt and nothing happen , any clue where is my mistake its kill httpd if there is more than 10 sleep process and start the httpd with zero sleep process #!/bin/bash #this means loop forever while [ 1 ]; do HTTP=`ps auwxf | grep httpd | grep -v grep | wc -l`; #the above line counts the number of httpd processes found running #and the following line says if there were less then 10 found running if [ $[HTTP] -lt 10 ]; then killall -9 httpd; #inside the if now, so there are less then 10, kill them all and wait 1 second sleep 1; #start apache /etc/init.d/httpd start; fi; #all done, sleep for ten seconds before we loop again sleep 10;done

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• Killing COM object from C#

  - by Pradeep

  I have a COM object that we are calling from C#. This works great, and I have my own pool of objects that I can use whenever I want. Now I need to kill the object. I've tried releasing the COM object explicitly and then garbage collecting from another thread, but that does nothing. Does anyone have any other ideas to kill this object? Thanks for the help. I've tried System.Runtime.InteropServices.Marshal.ReleaseComObject(myApp); GC.Collect(); GC.WaitForPendingFinalizers (); myApp = null; and I create it by myApplication.ApplicationClass myApp = new myApplication.ApplicationClass(); Thanks, Pradeep

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• How to control a subthread process in python?

  - by SpawnCxy

  Code first: '''this is main structure of my program''' from twisted.web import http from twisted.protocols import basic import threading threadstop = False #thread trigger,to be done class MyThread(threading.Thread): def __init__(self): threading.Thread.__init__(self) self.start() def run(self): while True: if threadstop: return dosomething() '''def some function''' if __name__ == '__main__': from twisted.internet import reactor t = MyThread() reactor.listenTCP(serverport,myHttpFactory()) reactor.run() As my first multithread program,I feel happy that it works as expected.But now I find I cannot control it.If I run it on front,Control+C can only stop the main process,and I can still find it in processlist;if I run it in background,I have to use kill -9 pid to stop it.And I wonder if there's a way to control the subthread process by a trigger variale,or a better way to stop the whole process other than kill -9.Thanks.

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• Best way to store 3 pieces of data as a single entry

  - by Matt

  For a game server, I want to record details when a player makes a kill, store this, and then at intervals update to a sql database. The part i'm interested in right now is the best method of storing the kill information. What i'd like to pass to the sql server on update would be {PlayerName, Kills, Deaths}, where the kills and deaths are a sum for the period between updates. So i'm assuming i'd build a list along the lines of {bob, 1, 0} {frank, 0, 1} {tom, 1, 0} {frank, 0, 1} then on update, consolidate the list to {frank, 14, 3}etc Can someone offer some advice please?

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• Webbrowser control and cookies

  - by Mike

  Hello! I have a webbrowser control in my program and what I want to do is to delete all the cookies stored in my computer. The problem is that for example I'm in some site, and then I decide I want to delete all the cookies, so I do it by the command "Kill()" but the problem is that the cookies remain and this site still can recognize me, and to complete the kill command I need to close my program and enter it again. The webbrowser control uses Internet Explorer, and I think when you enter IE it somehow loads all the cookies into it so if you delete your cookies, they remain there. So I'm wondering how can I delete my cookies, completely delete them without the need to close my program and enter it once again. Any help will be appreciated!

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• Adding x11vnc as a Solaris SMF service

  - by rojanu

  I am trying add x11vnc as SMF service but cannot get service to start. I tried googling but couldn't find anything that could help me. Here is the startup script #!/sbin/sh # # Copyright (c) 1995, 1997-1999 by Sun Microsystems, Inc. # All rights reserved. # #ident "@(#)x11vnc 1.14 06/11/17 SMI" case "$1" in 'start') #/usr/local/bin/x11vnc -geometry 1280x1024 -noshm -display :0 -ncache 10 -noshm -shared -forever -o /tmp/vnc_remote.log -bg /usr/local/bin/x11vnc -unixpw -ncache 10 -display :0 -noshm -shared -forever -o /tmp/vnc_remote.log ;; 'stop') /usr/bin/pkill -x -u 0 x11vnc ;; *) echo "Usage: $0 { start | stop }" ;; esac exit 0 and here is the manifest file <?xml version='1.0'?> <!DOCTYPE service_bundle SYSTEM '/usr/share/lib/xml/dtd/service_bundle.dtd.1'> <service_bundle type='manifest' name='vnc'> <service name='application/x11vnc' type='service' version='0'> <create_default_instance enabled='true'/> <single_instance/> <dependency name='docusp' grouping='require_all' restart_on='none' type='service'> <service_fmri value='svc:/milestone/multi-user-server:default'/> </dependency> <exec_method name='start' type='method' exec='/lib/svc/method/x11vnc' timeout_seconds='0'> <method_context/> </exec_method> <exec_method name='stop' type='method' exec=':true' timeout_seconds='10'> <method_context/> </exec_method> <stability value='Evolving' /> <property_group name='startd' type='framework'> <propval name='ignore_error' type='astring' value='core,signal'/> </property_group> </service> </service_bundle> and the log file Usage: /lib/svc/method/x11vnc { start | stop } [ Nov 16 19:35:52 Method "start" exited with status 0 ] [ Nov 16 19:35:52 Stopping because all processes in service exited. ] [ Nov 16 19:35:52 Executing stop method (:kill) ] [ Nov 16 19:35:52 Executing start method ("/lib/svc/method/x11vnc") ] Usage: /lib/svc/method/x11vnc { start | stop } [ Nov 16 19:35:52 Method "start" exited with status 0 ] [ Nov 16 19:35:52 Stopping because all processes in service exited. ] [ Nov 16 19:35:52 Executing stop method (:kill) ] [ Nov 16 19:35:52 Executing start method ("/lib/svc/method/x11vnc") ] Usage: /lib/svc/method/x11vnc { start | stop } [ Nov 16 19:35:52 Method "start" exited with status 0 ] [ Nov 16 19:35:52 Stopping because all processes in service exited. ] [ Nov 16 19:35:52 Executing stop method (:kill) ] [ Nov 16 19:35:52 Restarting too quickly, changing state to maintenance ] Any Ideas?

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• Bash: infinite sleep

  - by watain

  I use startx to start X which will evaluate my .xinitrc. In my .xinitrc I start my window manager using /usr/bin/mywm. Now, if I kill my WM (in order to f.e. test some other WM), X will terminate too because the .xinitrc script reached EOF. So I added this at the end of my .xinitrc: while true; do sleep 10000; done This way X won't terminate if I kill my WM. Now my question: how can I do an infinite sleep instead of looping sleep? Is there a command which will kinda like freeze the script? Best regards

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• Tracking/Counting Word Frequency

  - by Joel Martinez

  I'd like to get some community consensus on a good design to be able to store and query word frequency counts. I'm building an application in which I have to parse text inputs and store how many times a word has appeared (over time). So given the following inputs: "To Kill a Mocking Bird" "Mocking a piano player" Would store the following values: Word Count ------------- To 1 Kill 1 A 2 Mocking 2 Bird 1 Piano 1 Player 1 And later be able to quickly query for the count value of a given arbitrary word. My current plan is to simply store the words and counts in a database, and rely on caching word count values ... But I suspect that I won't get enough cache hits to make this a viable solution long term. Can anyone suggest algorithms, or data structures, or any other idea that might make this a well-performing solution?

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• How to check if a process is running or got segfaulted or terminated in linux from its pid in my mai

  - by rkbang

  Hello all, I am invoking several processes in my main and I can get the pid of that processes. Now I want to wait until all this processes have been finished and then clear the shared memory block from my parent process. Also if any of the process not finished and segfaulted I want to kill that process. So how to check from the pid of processes in my parent process code that a process is finished without any error or it gave broke down becoz of runtime error or any other cause, so that I can kill that process. Also what if I want to see the status of some other process which is not a child process but its pid is known. Code is appreciated( I am not looking for script but code ).

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• Killing a script launched in a Process via os.system()

  - by L.J.

  I have a python script which launches several processes. Each process basically just calls a shell script: from multiprocessing import Process import os import logging def thread_method(n = 4): global logger command = "~/Scripts/run.sh " + str(n) + " >> /var/log/mylog.log" if (debug): logger.debug(command) os.system(command) I launch several of these threads, which are meant to run in the background. I want to have a timeout on these threads, such that if it exceeds the timeout, they are killed: t = [] for x in range(10): try: t.append(Process(target=thread_method, args=(x,) ) ) t[-1].start() except Exception as e: logger.error("Error: unable to start thread") logger.error("Error message: " + str(e)) logger.info("Waiting up to 60 seconds to allow threads to finish") t[0].join(60) for n in range(len(t)): if t[n].is_alive(): logger.info(str(n) + " is still alive after 60 seconds, forcibly terminating") t[n].terminate() The problem is that calling terminate() on the process threads isn't killing the launched run.sh script - it continues running in the background until I either force kill it from the command line, or it finishes internally. Is there a way to have terminate also kill the subshell created by os.system()?

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• Does HTML5 only replace the video aspects of Flash/Silverlight?

  - by John

  I see a lot of talk how HTML5 video tag will kill Flash. But while video is the most widely used part of Flash/SL, it's only a small part of their technical abilities. For instance you can write a game using full 3D graphics and socket connections in Flex, and serious business applications, etc. Is the thinking that Javascript will kill those parts of Flash/Flex/SL? Because while that seems feasible now for even quite rich web-apps, what about any kind of high-performance app like real-time graphics?

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• How to build a sentence parser using only the c++ standared library?

  - by CiM

  Hello everyone, I am designing a text based game similar to Zork, and I would like it to able to parse a sentance and draw out keywords such TAKE, DROP ect. The thing is, I would like to do this all through the standard c++ library... I have heard of external libraries (such as flex/bison) that effectively accomplish this; however I don't want to mess with those just yet. What I am thinking of implementing is a token based system that has a list of words that the parser can recognize even if they are in a sentence such as "take sword and kill monster" and know that according to the parsers grammar rules, TAKE, SWORD, KILL and MONSTER are all recognized as tokens and would produce the output "Monster killed" or something to that effect. I have heard there is a function in the c++ standard library called strtok that does this, however I have also heard it's "unsafe". So if anyone here could lend a helping hand, I would greatly appreciate it.

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• Run and terminate a prgram (Python under Windows)

  - by Fredrich

  I'd like to create a small script to that basically does this: run program1.exe -- kill program1.exe after n seconds -- run program1.exe again. I know some basic Python and would read up on this, but I'm in a bit of a hurry and just need this to get done asap. If someone has a script/idea or could help my out with just the syntax I need to open and kill the .exe file, please... I don't mind solutions in other languages either. I'm sorry if this is a bit "please write my code"-ish, that's not something I typically do.

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• Killing a subprocess including its children from python

  - by user316664

  Hi, I'm using the subprocess module on python 2.5 to spawn a java program (the selenium server, to be precise) as follows: import os import subprocess display = 0 log_file_path = "/tmp/selenium_log.txt" selenium_port = 4455 selenium_folder_path = "/wherever/selenium/lies" env = os.environ env["DISPLAY"] = ":%d.0" % display command = ["java", "-server", "-jar", 'selenium-server.jar', "-port %d" % selenium_port] log = open(log_file_path, 'a') comm = ' '.join(command) selenium_server_process = subprocess.Popen(comm, cwd=selenium_folder_path, stdout=log, stderr=log, env=env, shell=True) This process is supposed to get killed once the automated tests are finished. I'm using os.kill to do this: os.killpg(selenium_server_process.pid, signal.SIGTERM) selenium_server_process.wait() This does not work. The reason is that the shell subprocess spawns another processfor the java program, and the pid of that process is unknown to my python code. I've tried killing the process group with os.killpg, but that kills also the python process which runs this code in the first place. Setting shell to false, thus avoiding the java program to run inside a shell environment, is also out of the question, due to other reasons. Does anyone have an idea how I can kill the shell and any other processes generated by it? Cheers, Ulas

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