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• Use WM_COPYDATA to send data between processes

  - by Charles Gargent

  I wish to send text between processes. I have found lots of examples of this but none that I can get working. Here is what I have so far: for the sending part: COPYDATASTRUCT CDS; CDS.dwData = 1; CDS.cbData = 8; CDS.lpData = NULL; SendMessage(hwnd, WM_COPYDATA , (WPARAM)hwnd, (LPARAM) (LPVOID) &CDS); the receiving part: case WM_COPYDATA: COPYDATASTRUCT* cds = (COPYDATASTRUCT*) lParam; I dont know how to construct the COPYDATASTRUCT, I have just put something in that seems to work. When debugging the WM_COPYDATA case is executed, but again I dont know what to do with the COPYDATASTRUCT. I would like to send text between the two processes. As you can probably tell I am just starting out, I am using GNU GCC Compiler in Code::Blocks, I am trying to avoid MFC and dependencies.

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• How to make/monitor/deploy daemon processes in JRuby

  - by nazdrug

  I'm currently porting a Rails App currently using REE to JRuby so I can offer an easy-to-install JRuby alternative. I've bundled the app into a WAR file using Bundler which I'm currently deploying to GlassFish. However, this app has a couple of daemon processes and it would be ideal if these could be part of the WAR file, and potentially monitored by Glassfish (if possible). I've looked at QuartzScheduler, and while meets my needs for a couple of things, I have a daemon process that must execute every 20 seconds as it's polling the database for any delayed mail to send. If anyone can provide any insight as to how best to set up daemon processes in a JRuby/Java/Glassfish environment any help will be greatly appreciated! :)

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• Killing Mysql processes staying in sleep command.

  - by Shino88

  Hey I am connecting a MYSQL database through hibernate and i seem to have processes that are not being killed after they are finished in the session. I have called flush and close on each session but when i check the server the last processes are still there with a sleep command. This is a new problem which i am having and was not the case yesterday. Is there any way i can ensure the killng of theses processes when i am done with a session. Below is an example of one of my classes. public JSONObject check() { //creates a new session needed to add elements to a database Session session = null; //holds the result of the check in the database JSONObject check = new JSONObject(); try{ //creates a new session needed to add elements to a database SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory(); session = sessionFactory.openSession(); if (justusername){ //query created to select a username from user table String hquery = "Select username from User user Where username = ? "; //query created Query query = session.createQuery(hquery); //sets the username of the query the values JSONObject contents query.setString(0, username); // executes query and adds username string variable String user = (String) query.uniqueResult(); //checks to see if result is found (null if not found) if (user == null) { //adds false to Jobject if not found check.put("indatabase", "false"); } else { check.put("indatabase", "true"); } //adds check to Jobject to say just to check username check.put("justusername", true); } else { //query created to select a username and password from user table String hquery = "Select username from User user Where username = :user and password = :pass "; Query query = session.createQuery(hquery); query.setString("user", username); query.setString("pass", password); String user = (String) query.uniqueResult(); if(user ==null) { check.put("indatabase", false); } else { check.put("indatabase", true); } check.put("justusername", false); } }catch(Exception e){ System.out.println(e.getMessage()); //logg.log(Level.WARNING, " Exception", e.getMessage()); }finally{ // Actual contact insertion will happen at this step session.flush(); session.close(); } //returns Jobject return check; }

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• Associating logging from two or more processes

  - by Fadeproof

  I have two processes that I have up and running and I am doing logging from. One is a client the other is a webservice. I want to setup a central log system where I can track logs and interactions between processes -- for instance I want to be able to associate calls made from the client to the webservice when I look at the logs. I guess this means that somehow the processid of the client process needs to flow over to the webservice in some way for it to be trackable? Is this possible with current logging frameworks such as Enterprise Library or Log4Net? Is there anyone that has looked into something like this? Any help would be appreciated. If you have a more defining term for this please feel free to change the title of the question or tags.

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• Get list of running processes, get active process (and it's application) Flex/AIR

  - by Adam Kiss

  Hello, just a quickie (or maybe not:] ): Is it possible to get somehow list of running applications/processes and, while running in background, check which process is active? Additionally - if somehow, the answer was yes, is it possible to react for change of active window / application react just as if it was Event, or bind to it custom event (e.g. Event.SystemActiveAppChange)? Thank you for answers as well as pointers. EDIT: Due to probable missunderstanding, I mean local applications - on your win/mac/linux machine - I would like to (in process of learning of language) track what apps I use the most, make a little graph maybe? So, the point is: in AIR app, developed in FLEX, I would like to get/list all running applications/processes, as well as which one is active (on user's PC/Mac/Linux)

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• Why are Asynchronous processes not called Synchronous?

  - by Balk

  So I'm a little confused by this terminology. Everyone refers to "Asynchronous" computing as running different processes on seperate threads, which gives the illusion that these processes are running at the same time. This is not the definition of the word asynchronous. a·syn·chro·nous –adjective 1. not occurring at the same time. 2. (of a computer or other electrical machine) having each operation started only after the preceding operation is completed. What am I not understanding here?

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• Controlling processes from Python

  - by Nathan

  Hi, I want to control several subprocesses of the same type from python (I am under linux). I want to: Start them. Stop them. Ask if they are still running. I can start a processes with with spawnl, and get the pid. Using this pid I can stop it with kill. And I am sure there is also a way to ask if it is running with the pid. The problem is, what if the following happens: I start a process, remember the pid. The process ends without me noticing and another completely different process starts getting assigned the same pid. I attempt to kill my process, I kill a completely different one. What is the better way to start and control processes in python? Thanks!

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• Suggestions for lightweight, thread-safe scheduler

  - by nirvanai

  I am trying to write a round-robin scheduler for lightweight threads (fibers). It must scale to handle as many concurrently-scheduled fibers as possible. I also need to be able to schedule fibers from threads other than the one the run loop is on, and preferably unschedule them from arbitrary threads as well (though I could live with only being able to unschedule them from the run loop). My current idea is to have a circular doubly-linked list, where each fiber is a node and the scheduler holds a reference to the current node. This is what I have so far: using Interlocked = System.Threading.Interlocked; public class Thread { internal Future current_fiber; public void RunLoop () { while (true) { var fiber = current_fiber; if (fiber == null) { // block the thread until a fiber is scheduled continue; } if (fiber.Fulfilled) fiber.Unschedule (); else fiber.Resume (); //if (current_fiber == fiber) current_fiber = fiber.next; Interlocked.CompareExchange<Future> (ref current_fiber, fiber.next, fiber); } } } public abstract class Future { public bool Fulfilled { get; protected set; } internal Future previous, next; // this must be thread-safe // it inserts this node before thread.current_fiber // (getting the exact position doesn't matter, as long as the // chosen nodes haven't been unscheduled) public void Schedule (Thread thread) { next = this; // maintain circularity, even if this is the only node previous = this; try_again: var current = Interlocked.CompareExchange<Future> (ref thread.current_fiber, this, null); if (current == null) return; var target = current.previous; while (target == null) { // current was unscheduled; negotiate for new current_fiber var potential = current.next; var actual = Interlocked.CompareExchange<Future> (ref thread.current_fiber, potential, current); current = (actual == current? potential : actual); if (current == null) goto try_again; target = current.previous; } // I would lock "current" and "target" at this point. // How can I do this w/o risk of deadlock? next = current; previous = target; target.next = this; current.previous = this; } // this would ideally be thread-safe public void Unschedule () { var prev = previous; if (prev == null) { // already unscheduled return; } previous = null; if (next == this) { next = null; return; } // Again, I would lock "prev" and "next" here // How can I do this w/o risk of deadlock? prev.next = next; next.previous = prev; } public abstract void Resume (); } As you can see, my sticking point is that I cannot ensure the order of locking, so I can't lock more than one node without risking deadlock. Or can I? I don't want to have a global lock on the Thread object, since the amount of lock contention would be extreme. Plus, I don't especially care about insertion position, so if I lock each node separately then Schedule() could use something like Monitor.TryEnter and just keep walking the list until it finds an unlocked node. Overall, I'm not invested in any particular implementation, as long as it meets the requirements I've mentioned. Any ideas would be greatly appreciated. Thanks! P.S- For the curious, this is for an open source project I'm starting at http://github.com/nirvanai/Cirrus

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• Gearman too many processes issue

  - by Roman Newaza

  I use Net_Gearman from PECL, Gearmand 1.1.11 and Gearman Manager. Every time I add background job, I can see new worker listed with no Function, nor Id in Ggearman-Monitor: If I add many messages in the bash loop, after some time it becomes very slow. for i in $(seq 0 9999); do php Client.php && echo $i; done Yesterday, the situation was even worse - I had many error messages in Gearmand log regarding Too many open files and once I added --file-descriptors=49152 as an option and swithched to 1.1.11 from 1.0.6, these errors gone. Here is lsof -p $(cat /var/run/gearman/gearmand.pid) output: COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME gearmand 2020 gearman cwd DIR 8,2 4096 2 / gearmand 2020 gearman rtd DIR 8,2 4096 2 / gearmand 2020 gearman txt REG 8,2 3852472 3672962 /opt/sbin/gearmand gearmand 2020 gearman mem REG 8,2 52120 9961752 /lib/x86_64-linux-gnu/libnss_files-2.15.so gearmand 2020 gearman mem REG 8,2 47680 9961756 /lib/x86_64-linux-gnu/libnss_nis-2.15.so gearmand 2020 gearman mem REG 8,2 97248 9961768 /lib/x86_64-linux-gnu/libnsl-2.15.so gearmand 2020 gearman mem REG 8,2 35680 9961750 /lib/x86_64-linux-gnu/libnss_compat-2.15.so gearmand 2020 gearman mem REG 8,2 92720 9964871 /lib/x86_64-linux-gnu/libz.so.1.2.3.4 gearmand 2020 gearman mem REG 8,2 109288 11014600 /usr/lib/x86_64-linux-gnu/libsasl2.so.2.0.25 gearmand 2020 gearman mem REG 8,2 1030512 9961759 /lib/x86_64-linux-gnu/libm-2.15.so gearmand 2020 gearman mem REG 8,2 1930616 9964982 /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 gearmand 2020 gearman mem REG 8,2 382896 9964977 /lib/x86_64-linux-gnu/libssl.so.1.0.0 gearmand 2020 gearman mem REG 8,2 1815224 9961748 /lib/x86_64-linux-gnu/libc-2.15.so gearmand 2020 gearman mem REG 8,2 88384 9964865 /lib/x86_64-linux-gnu/libgcc_s.so.1 gearmand 2020 gearman mem REG 8,2 962656 11014043 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.16 gearmand 2020 gearman mem REG 8,2 199600 11016157 /usr/lib/x86_64-linux-gnu/libmemcached.so.11.0.0 gearmand 2020 gearman mem REG 8,2 31752 9961755 /lib/x86_64-linux-gnu/librt-2.15.so gearmand 2020 gearman mem REG 8,2 14768 9961763 /lib/x86_64-linux-gnu/libdl-2.15.so gearmand 2020 gearman mem REG 8,2 414280 9183971 /usr/lib/libboost_program_options.so.1.46.1 gearmand 2020 gearman mem REG 8,2 283832 9183656 /usr/lib/libevent-2.0.so.5.1.4 gearmand 2020 gearman mem REG 8,2 664504 11014432 /usr/lib/x86_64-linux-gnu/libsqlite3.so.0.8.6 gearmand 2020 gearman mem REG 8,2 135366 9961757 /lib/x86_64-linux-gnu/libpthread-2.15.so gearmand 2020 gearman mem REG 8,2 3534240 9175810 /usr/lib/libmysqlclient.so.18.1.0 gearmand 2020 gearman mem REG 8,2 149280 9961760 /lib/x86_64-linux-gnu/ld-2.15.so gearmand 2020 gearman 0u CHR 1,3 0t0 1029 /dev/null gearmand 2020 gearman 1u CHR 1,3 0t0 1029 /dev/null gearmand 2020 gearman 2u CHR 1,3 0t0 1029 /dev/null gearmand 2020 gearman 3w REG 8,2 9381897 3409366 /var/log/gearman-job-server/gearman.log gearmand 2020 gearman 4r FIFO 0,8 0t0 38869143 pipe gearmand 2020 gearman 5w FIFO 0,8 0t0 38869143 pipe gearmand 2020 gearman 6u 0000 0,9 0 6826 anon_inode gearmand 2020 gearman 7u unix 0xffff880230fdf500 0t0 38869144 socket gearmand 2020 gearman 8u unix 0xffff880230fdde40 0t0 38869145 socket gearmand 2020 gearman 9u IPv4 38869146 0t0 TCP localhost:4730 (LISTEN) gearmand 2020 gearman 10r FIFO 0,8 0t0 38869147 pipe gearmand 2020 gearman 11w FIFO 0,8 0t0 38869147 pipe gearmand 2020 gearman 12u 0000 0,9 0 6826 anon_inode gearmand 2020 gearman 13u unix 0xffff880230fde4c0 0t0 38869148 socket gearmand 2020 gearman 14u unix 0xffff880230fdeb40 0t0 38869149 socket gearmand 2020 gearman 15r FIFO 0,8 0t0 38869150 pipe gearmand 2020 gearman 16w FIFO 0,8 0t0 38869150 pipe gearmand 2020 gearman 17u 0000 0,9 0 6826 anon_inode gearmand 2020 gearman 18u 0000 0,9 0 6826 anon_inode gearmand 2020 gearman 19u unix 0xffff880230fdb400 0t0 38869151 socket gearmand 2020 gearman 20u unix 0xffff880230fdaa40 0t0 38869152 socket gearmand 2020 gearman 21r FIFO 0,8 0t0 38869153 pipe gearmand 2020 gearman 22w FIFO 0,8 0t0 38869153 pipe gearmand 2020 gearman 23u unix 0xffff880203cfce00 0t0 38868290 socket gearmand 2020 gearman 24u unix 0xffff880203cfdb00 0t0 38868291 socket gearmand 2020 gearman 25r FIFO 0,8 0t0 38868292 pipe gearmand 2020 gearman 26w FIFO 0,8 0t0 38868292 pipe gearmand 2020 gearman 27u 0000 0,9 0 6826 anon_inode gearmand 2020 gearman 28u unix 0xffff880203cf9040 0t0 38868293 socket gearmand 2020 gearman 29u unix 0xffff880203cfaa40 0t0 38868294 socket gearmand 2020 gearman 30r FIFO 0,8 0t0 38868295 pipe gearmand 2020 gearman 31w FIFO 0,8 0t0 38868295 pipe gearmand 2020 gearman 32u IPv4 38868324 0t0 TCP localhost:4730->localhost:57954 (ESTABLISHED) gearmand 2020 gearman 33u IPv4 38868325 0t0 TCP localhost:4730->localhost:57955 (ESTABLISHED) gearmand 2020 gearman 34u IPv4 38901247 0t0 TCP localhost:4730->localhost:38594 (ESTABLISHED) gearmand 2020 gearman 35u IPv4 38868327 0t0 TCP localhost:4730->localhost:57957 (ESTABLISHED) gearmand 2020 gearman 36u IPv4 38867483 0t0 TCP localhost:4730->localhost:57959 (ESTABLISHED) gearmand 2020 gearman 37u IPv4 38867484 0t0 TCP localhost:4730->localhost:57958 (ESTABLISHED) gearmand 2020 gearman 38u IPv4 38901248 0t0 TCP localhost:4730->localhost:38595 (CLOSE_WAIT) gearmand 2020 gearman 39u IPv4 38901249 0t0 TCP localhost:4730->localhost:38597 (ESTABLISHED) gearmand 2020 gearman 40u IPv4 38869201 0t0 TCP localhost:4730->localhost:57979 (ESTABLISHED) gearmand 2020 gearman 41u IPv4 38900437 0t0 TCP localhost:4730->localhost:38599 (ESTABLISHED) gearmand 2020 gearman 42u IPv4 38900438 0t0 TCP localhost:4730->localhost:38602 (ESTABLISHED) gearmand 2020 gearman 43u IPv4 38868375 0t0 TCP localhost:4730->localhost:57987 (ESTABLISHED) gearmand 2020 gearman 44u IPv4 38900468 0t0 TCP localhost:4730->localhost:38606 (CLOSE_WAIT) gearmand 2020 gearman 45u IPv4 38868381 0t0 TCP localhost:4730->localhost:57999 (ESTABLISHED) gearmand 2020 gearman 46u IPv4 38868388 0t0 TCP localhost:4730->localhost:58007 (ESTABLISHED) gearmand 2020 gearman 47u IPv4 38868393 0t0 TCP localhost:4730->localhost:58011 (ESTABLISHED) gearmand 2020 gearman 48u IPv4 38903950 0t0 TCP localhost:4730->localhost:38609 (ESTABLISHED) gearmand 2020 gearman 49u IPv4 38870276 0t0 TCP localhost:4730->localhost:58019 (ESTABLISHED) gearmand 2020 gearman 50u IPv4 38903955 0t0 TCP localhost:4730->localhost:38613 (ESTABLISHED) gearmand 2020 gearman 51u IPv4 38900477 0t0 TCP localhost:4730->localhost:38617 (CLOSE_WAIT) gearmand 2020 gearman 52u IPv4 38867630 0t0 TCP localhost:4730->localhost:58031 (ESTABLISHED) gearmand 2020 gearman 53u IPv4 38867633 0t0 TCP localhost:4730->localhost:58035 (ESTABLISHED) gearmand 2020 gearman 54u IPv4 38867636 0t0 TCP localhost:4730->localhost:58039 (ESTABLISHED) gearmand 2020 gearman 55u IPv4 38900536 0t0 TCP localhost:4730->localhost:38619 (ESTABLISHED) gearmand 2020 gearman 56u IPv4 38868419 0t0 TCP localhost:4730->localhost:58047 (ESTABLISHED) gearmand 2020 gearman 57u IPv4 38869263 0t0 TCP localhost:4730->localhost:58051 (ESTABLISHED) gearmand 2020 gearman 58u IPv4 38900537 0t0 TCP localhost:4730->localhost:38621 (ESTABLISHED) gearmand 2020 gearman 59u IPv4 38869271 0t0 TCP localhost:4730->localhost:58059 (ESTABLISHED) gearmand 2020 gearman 60u IPv4 38900538 0t0 TCP localhost:4730->localhost:38623 (ESTABLISHED) gearmand 2020 gearman 61u IPv4 38870319 0t0 TCP localhost:4730->localhost:58067 (ESTABLISHED) gearmand 2020 gearman 62u IPv4 38900540 0t0 TCP localhost:4730->localhost:38628 (ESTABLISHED) gearmand 2020 gearman 63u IPv4 38869289 0t0 TCP localhost:4730->localhost:58075 (ESTABLISHED) ... gearmand 2020 gearman 2229u IPv4 38903885 0t0 TCP localhost:4730->localhost:38572 (ESTABLISHED) gearmand 2020 gearman 2230u IPv4 38901211 0t0 TCP localhost:4730->localhost:38576 (ESTABLISHED) gearmand 2020 gearman 2234u IPv4 38901237 0t0 TCP localhost:4730->localhost:38588 (ESTABLISHED)

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• Why are my uWSGI processes dying immediately?

  - by orokusaki

  I'm using Supervisor and the uWSGI Emperor mode. When I set limit-as to 512 (MB), workers die instantly (respawn, die, respawn, die, every 3/4 of a second or so): [uwsgi] workers = 4 threads = 40 limit-as = 512 harakiri = 20 max-requests = 1600 ... non-performance/memory/processor-related settings ommitted But, if I change limit-as to: [uwsgi] workers = 4 threads = 40 limit-as = 1024 harakiri = 20 max-requests = 1600 ... non-performance/memory/processor-related settings ommitted and restart uwsgi, the problem is gone immediately. In order to put a sham in this, I've modified the setting back to 512, restarted again, and the problem is back immediately. Notes: My app is a simple Django app without much additional Python setup during start-up time.

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• Sendmail background process sometimes processes queue, but sendmail -q always works

  - by markmcb

  I'm using sendmail version 8.14.4 on Fedora 15 to send email. My Rails app uses delayed_job to queue up emails. Messages will queue up in /var/spool/mqueue as expected, but don't always get processed. I can see the messages and sendmail is definitely running in the background. Restarting the process does nothing. However, when I issue the sendmail -q command, sendmail gets to work and starts sending. The really odd thing is that this behavior only occurs sometimes. Other times message queue up and are delivered as expected. I've tried tweaking various sendmail configs to reduce the time between queue processing (for example, adding define('confMIN_QUEUE_AGE', '0')dnl to /etc/mail/sendmail.mc), but nothing seems to do the trick. Any ideas what might be the root cause?

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• Shell Script Launching Child Processes

  - by Matt James

  Disclaimer: I'm totally new to shell scripting, but have quite a bit of experience in other languages like PHP and Obj-C. I'm writing my first daemon script. Here are the goals: I want it to run in the background I want it to be triggered by an init.d script that includes start/stop/restart commands I want each process in a loop to trigger its own subprocess. When the parent process kicked off by the init.d script is killed, I want the subprocesses to die as well. Essentially, I'm looking for the same kind of behavior that appears to be very common among software like apache, spamd, dovecot, etc. But, based on my research, I haven't found a single, simple answer as to how this kind of thing is achieved. Any help is greatly appreciated.

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• Configuring zsh in OSX to auto start processes

  - by calumbrodie

  I've recently converted to using zsh instead of bash in OSX and was wondering if it is possible to do the following: When I launch my terminal I would like to start various tabs and have each tab run a different process e.g tailing logs, running ruby scripts etc. Currently I need to cmd+n multiple tabs and then manually start each process. While this doesn't take long I would like to be able to just launch my terminal and have these various tabs start and run those commands automatically. Is this possible?

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• Excessive CPU Utilization for Bind 9.8.1 `named` processes

  - by justinzane

  I just noticed that named is eating vast amounts of CPU time for a very small network with only a few domains. Can someone help me determine what is misconfigured, please? Or how to debug this. top top - 14:13:08 up 25 days, 14:16, 1 user, load average: 1.04, 1.04, 1.05 Tasks: 149 total, 1 running, 148 sleeping, 0 stopped, 0 zombie %Cpu(s): 17.3 us, 4.3 sy, 0.0 ni, 78.2 id, 0.1 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem: 2042776 total, 1347916 used, 694860 free, 249396 buffers KiB Swap: 3976080 total, 30552 used, 3945528 free, 574164 cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 17445 bind 20 0 244m 42m 3124 S 99.4 2.2 2345:03 named rndc stats +++ Statistics Dump +++ (1352931389) ++ Incoming Requests ++ 65869 QUERY ++ Incoming Queries ++ 31809 A 241 NS 3 CNAME 27455 SOA 276 PTR 123 MX 462 TXT 5400 AAAA 7 A6 1 DS 14 DNSKEY 15 SPF 55 AXFR 8 ANY ++ Outgoing Queries ++ [View: internal] 22206 A 509 NS 10 SOA 25 PTR 12 MX 524 TXT 4851 AAAA 62 DNSKEY 19 SPF 3157 DLV [View: external] 87 A 2 NS 80 AAAA 120 DNSKEY 7 DLV [View: _bind] ++ Name Server Statistics ++ 65869 IPv4 requests received 27670 requests with EDNS(0) received 112 TCP requests received 65652 responses sent 20 truncated responses sent 27670 responses with EDNS(0) sent 62920 queries resulted in successful answer 37117 queries resulted in authoritative answer 28482 queries resulted in non authoritative answer 7 queries resulted in referral answer 591 queries resulted in nxrrset 53 queries resulted in SERVFAIL 2081 queries resulted in NXDOMAIN 14530 queries caused recursion 162 duplicate queries received 55 requested transfers completed ++ Zone Maintenance Statistics ++ 109536 IPv4 notifies sent ++ Resolver Statistics ++ [Common] [View: internal] 29362 IPv4 queries sent 2013 IPv6 queries sent 28531 IPv4 responses received 4209 NXDOMAIN received 6 SERVFAIL received 31 FORMERR received 32 EDNS(0) query failures 3359 query retries 836 query timeouts 5348 IPv4 NS address fetches 3271 IPv6 NS address fetches 83 IPv4 NS address fetch failed 2779 IPv6 NS address fetch failed 17421 DNSSEC validation attempted 12731 DNSSEC validation succeeded 4690 DNSSEC NX validation succeeded 21104 queries with RTT 10-100ms 7418 queries with RTT 100-500ms 3 queries with RTT 500-800ms 1 queries with RTT 800-1600ms [View: external] 192 IPv4 queries sent 104 IPv6 queries sent 192 IPv4 responses received 2 NXDOMAIN received 104 query retries 44 IPv4 NS address fetches 44 IPv6 NS address fetches 1 IPv4 NS address fetch failed 1 IPv6 NS address fetch failed 4 DNSSEC validation attempted 3 DNSSEC validation succeeded 1 DNSSEC NX validation succeeded 152 queries with RTT 10-100ms 40 queries with RTT 100-500ms [View: _bind] ++ Cache DB RRsets ++ [View: internal (Cache: internal)] 2007 A 652 NS 131 CNAME 1 MX 32 TXT 421 AAAA 28 DS 244 RRSIG 110 NSEC 3 DNSKEY 2 !A 2 !TXT 89 !AAAA 2 !SPF 14 !DLV 148 NXDOMAIN [View: external (Cache: external)] 55 A 12 NS 34 AAAA 2 DS 10 RRSIG 1 DNSKEY [View: _bind (Cache: _bind)] ++ Socket I/O Statistics ++ 82958 UDP/IPv4 sockets opened 2118 UDP/IPv6 sockets opened 4 TCP/IPv4 sockets opened 1 TCP/IPv6 sockets opened 82956 UDP/IPv4 sockets closed 2117 UDP/IPv6 sockets closed 58 TCP/IPv4 sockets closed 15 UDP/IPv4 socket bind failures 2117 UDP/IPv6 socket connect failures 29554 UDP/IPv4 connections established 59 TCP/IPv4 connections accepted 2117 UDP/IPv6 send errors 5 UDP/IPv4 recv errors ++ Per Zone Query Statistics ++ --- Statistics Dump --- (1352931389)

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• Find running processes created by Mac Automator

  - by zechdc

  Is there any way to view automator process that are running? About a year ago I created a workflow or something similar in Mac's Automator. When I took screenshots mac would place them on the desktop. I created a small script to take move those screenshots to a different folder. I want to change what folder those are saved in now. Problem is, I can't figure out how to edit my workflow. The biggest problem, I don't know where the workflow/file is stored. The process is always running so anytime I take a screenshot it is moved. Is there any way to view automator process that are running? Also, I know there are other ways to make screenshots appear in different folders. I still want to find this process/script and kill it =) Any suggestions are greatly appreciated. Thanks.

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• How to spawn-fcgi multiple fcgi processes ?

  - by Shrinath

  We have nginx installed and would like to spawn-fcgi multiple ".fcgi" files. The programs were written in C. How do we spawn all the files at one go ? Edit This is the scenario : I have 3 different programs to serve. Lets say, I've search results from google, yahoo, bing. I want to show 3 columns which host results of above providers. I have 3 fcgi scripts, one for each provider. How do you suggest I put all 3 into action ?

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• Problems getting Cron to run processes tagged @reboot for LDAP users

  - by Ben Torell

  I have a lab of computers running Ubuntu 9.10. Most of the people who log on to these computers are users from an LDAP server, and not local users. We discovered that if an LDAP user has a crontab with an entry marked to be run @reboot, the command will not actually run upon the reboot of a machine. I'm pretty sure that this is because the cron daemon starts before networking is fully up, so the crontabs of any LDAP users aren't loaded and run or checked for @reboot. In fact, cron will ignore LDAP users' crontabs entirely after a reboot until that user runs crontab -e again and saves, or until the cron daemon is rebooted. We were able to fix one part of this problem by adding the following line to /etc/crontab: @reboot root /bin/sleep 45 && /etc/init.d/cron restart Thus, when cron starts back up upon a reboot, it waits for networking to get up, then restarts the cron daemon. That fixes the problem of crontabs not being read at all for LDAP users. However, since it's the cron daemon being restarted and not the computer, @reboot entries are ignored. Is there a way for a user to make a command run upon restarting the daemon, rather than a reboot? Or is there a better solution to this overall problem? Thanks.

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• Monit wont start/stop any processes

  - by Vaughan Magnusson

  Hi, I've got monit running on a linux vserver, installed in a custom location /home/user/bin/monit as that is the only suitable location according to the webhost providers. When I installed monit I used ./configure --prefix=/home/user Monit itself runs, and sends me emails of it's activity, and the control file syntax is correct. However, monit cannot seem to start or stop anything - or even run the simplest of scripts. eg. Using 'monit stop all', I try to run the following stop command stop = "/bin/bash /home/user/simple_script.sh" Which fails (and says so in the log). I cant figure out why this is failing, can anyone help with this?

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• Alternative to Daemontools (djbtools) to supervise unix processes?

  - by Stefan Lasiewski

  I've used Daemontools to provide a simple and reliable way to supervise Unix services on my servers. It works well, but it requires a different way of thinking (The DJB Way) and some common complaints are: TAI64N based timestamps Doesn't store scripts under /etc/init.d (or (/usr/local)/etc/rc.d) Doesn't always work with scripts like apachectl. Some scripts need to be rewritten. I remember that some similar "supervisor/watchdog" daemons were in the works about two years ago, but some were still a little rough around the edges. If you have switched from Daemontools to something else, what did you choose and did it work well for you? Does RedHat or Ubuntu come with any process supervisor utilities by default?

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• How is DNS used by individual processes?

  - by atroon

  When resolving FQDNs or machine names to IP addresses on my local network (mycompany.internal) I can use dig on the command line (linux/mac) or nslookup (windows) to query the configured server and get a response. But trying to enter the FQDN or even just the machine name in a ping command or in a web browser results in 'Unknown Host' or DNS errors. Here's a sample, this one from the Mac: mac:~ atroon$ dig server.mycompany.internal ; <<>> DiG 9.6.0-APPLE-P2 <<>> server.mycompany.internal ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5219 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;server.mycompany.internal. IN A ;; ANSWER SECTION: server.mycompany.internal. 1200 IN A 172.16.254.36 ;; Query time: 0 msec ;; SERVER: 172.16.254.8#53(172.16.254.8) ;; WHEN: Wed Dec 16 11:39:15 2009 ;; MSG SIZE rcvd: 55 mac:~ atroon$ ping server.mycompany.internal<br> ping: cannot resolve server.mycompany.internal: Unknown host I cannot for the life of me figure this one out. The DNS server is a SBS 2003 box which handles AD, some file/print, etc for a small company network. This issue happens to me about three times a week, and when I'm connected to the local network directly, the same switch as the server even. I can make any connection I want with IP addresses, I just can't make DNS work. Additionally, at the same time I'm experiencing this, other users are fine, which makes me think it's a problem on my Mac. But what sort of problem? How can dig send a query and get a reply, and ping say 'unknown host'? I'm posting here vs. serverfault because I think this is a local problem not a server problem...but if anyone can point me at the server, I guess we'll head down the street a domain or two.

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• Upgrade processes between FreeBSD/Ubuntu

  - by bianster

  Are there significant differences between FreeBSD and Ubuntu Linux when it comes to upgrading? FreeBSD appears to offers a more reliable path for upgrades with "freebsd-update" though I think "apt-get update --system" is the equivalent for Ubuntu. I'll like to know which one is less likely to produce SNAFUs when undertaking minor/major updates.

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• Windows 7 - Intermittently processes will not close when the app closes

  - by Bill Sambrone

  I have a user I am supporting who has the strangest issue. There are 2 problem applications, Word 2010 and a scanning program called ScandallPro. Intermittently (and at least once a day), she will close an app and the underlying process will not close. Both Word 2010 and this scanning software have all the latest updates. There is another user who has the same software that does not have this problem, and has identical hardware. I have formatted and rebuilt the computer for the user who is having the problems. After the rebuild, the machine was fine for a day but the scanning software continues to intermittently keep the process running even after it is closed. This is a problem because she cannot open a new instance of it while the process is still running. There is a boatload of line of business software on this machine, all of which she needs. I believe the Word 2010 issue is due to a misbehaving add-in (there are 2 add-ins, neither of which seem stable), and I think my best bet is to work with the add-in vendor on it. The scanning program staying open is isolated to this 1 user. The only difference between her machine and the other user is that she has Quickbooks, RoboForm, and Adobe Acrobat X Pro. Any ideas of what can be causing this, or other diagnostic steps to try?

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• TIME_WAIT in netstat of Apache processes

  - by Howard

  What are the meaning of the TIME_WAIT when using netstat of my web server process? I am sure the web server is not over loaded. tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 15655/apache2 tcp 0 0 x.x.x.x:80 123.125.66.35:19667 SYN_RECV - tcp 0 0 x.x.x.x:80 113.138.59.140:12186 TIME_WAIT - tcp 0 0 x.x.x.x:80 66.249.67.121:59493 ESTABLISHED 23702/apache2 tcp 0 0 x.x.x.x:80 69.28.51.206:40652 TIME_WAIT - tcp 0 0 x.x.x.x:80 221.126.149.99:51877 TIME_WAIT - tcp 0 0 x.x.x.x:80 221.126.149.99:51872 TIME_WAIT - tcp 0 0 x.x.x.x:80 123.125.66.19:13084 TIME_WAIT -

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• IPC between multiple processes on multiple servers

  - by z8000

  Let's say you have 2 servers each with 8 CPU cores each. The servers each run 8 network services that each host an arbitrary number of long-lived TCP/IP client connections. Clients send messages to the services. The services do something based on the messages, and potentially notify N1 of the clients of state changes. Sure, it sounds like a botnet but it isn't. Consider how IRC works with c2s and s2s connections and s2s message relaying. The servers are in the same data center. The servers can communicate over a private VLAN @1GigE. Messages are < 1KB in size. How would you coordinate which services on which host should receive and relay messages to connected clients for state change messages? There's an infinite number of ways to solve this problem efficiently. AMQP (RabbitMQ, ZeroMQ, etc.) Spread Toolkit N^2 connections between allservices (bad) Heck, even run IRC! ... I'm looking for a solution that: perhaps exploits the fact that there's only a small closed cluster is easy to admin scales well is "dumb" (no weird edge cases) What are your experiences? What do you recommend? Thanks!

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• How to close all background processes in unix?

  - by Gabi Purcaru

  I have something like: cd project && python manage.py runserver & cd utilities && ./coffee_auto_compiler.py And I want both of them to close on Ctrl-C (or some other command). How can I accomplish that? EDIT: I tried using jobs -x kill and kill `jobs -p `, but it doesn't seem to kill what I need. Here is what I mean: moon 8119 0.0 0.0 7556 3008 pts/0 S 13:17 0:00 /bin/bash moon 8120 6.8 0.4 24568 18928 pts/0 S 13:17 0:00 python manage.py runserver jobs -p give me just process 8119, but I also need to close 8120, since it's the thing that the first command opened. If it helps, the commands are actually in a Makefile, and I want it to run two daemons at the same time (and somehow close them at the same time). And yes, I'm using ubuntu, with bash

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