zombie-process

how can I get information on the state of a process (i.e. if it is a zombie) using C under Linux? After reading the answers so far I want to narrow my question somewhat: I would prefer a pure C solution. After reading the ps source (which reads /proc/) I thought that there should be a better way and asked here :) You'll want to learn about interacting with the /proc/ "psuedo-filesystem" via typical C standard library calls. The documentation necessary to get started is included with any Linux distro and is a simple google search away. (Now that you know what to search for. I know that's

I'm developing a web application using a cookie to store session information. I've manually deleted the session cookies because I'm working on another part of the code where I don't want a login session. However, after a couple reloads of the page, the session cookie mysteriously reappears, including an earlier cookie that I had only set once for testing purposes, then deleted and never used again. I keep manually deleting the cookies in question, but still, when I reload the page after a while, the cookies are back. I've double-checked my code and I am positive I'm not setting those cookies

Well I have weird problem. I can't create a zombie process in my project, but I can do this in other file. There's simple instructions: int main() { if(fork()==0) printf("Some instructions\n"); else { sleep(10); wait(0); } return 0; } That simple code create a zombie process for 10 seconds. I'm checking and it actually exists. But if I copy this code to my program (my own shell), everything executing like before BUT zombie process doesn't exist at all. I don't know what's the difference. It's same code. Is there a more information I should know about that? Is there a other way to create zombie

I have an application in Go that reroutes the STDIN and STDOUT of binaries and then runs them. In a nutshell I'm doing: - create command object with the binary path (lets call the object command A) - create command object with the binary path (calling it command B) - set the stdout of command B to the stdin of Command A - start command A - start command B I noticed whenever the process for command B exits while command A is running, it becomes a zombie process in the process table. Here's an example: commandA := exec.Command("samplebin") commandB := exec.Command("sample2bin") cmdAStdin :=

I understand that a zombie is created when a process doesn't clean-up well (its resources aren't reclaimed/reaped). After calling fork() to create a new process, the parent should always call waitpid on that process to clean it up. I also have learned that a daemon is created by forking a child that was itself created by fork, and then letting the child die. Apparently the init process (pid #1) in UNIX would take custody of the process once you do this. What I want to know is - as far as I know, when a parent dies it cleans up the child automatically - so how does a zombie get created in the

I have a C++ pthread Thread invoking shell scripts using Popen. What is observed in one case is that a pthread_join failure is caught (i.e pthread_join != 0) and the child process remains as zombie ( as per ps output). This also causes the main program to hang. Right now, I don't know why the pthread_join would fail, because it never did in other scenarios. But I would like to know whether collecting the wait status of the child process spawned by Popen is part of thread_join. If so atleast I can be sure that the join failure is the root cause for the zombie and the program hang.. Thanks in

When I tried to archiving the project directly using Xcode menu ( Product - Archive ), it works well. But when I tried to execute it from the Integration menu (bot), I got this error: Build operation failed without specifying any errors. Individual build tasks may have failed for unknown reasons. One possible cause is if there are too many (possibly zombie) processes; in this case, rebooting may fix the problem. Some individual build task failures (up to 12) may be listed below. What happen? I couldn't find any error messages and completely have no clue on what's going on. I have tried to

i had these questions in my mind since i was reading some new topics on processes and threads. I would be glad if somebody could help me out. 1) What happens if a thread is marked uncancelable, and then the process is killed inside of the critical section? 2) Do we have a main thread for the program that is known to the operating system? i mean does the operating system give the first thread of the program some beneficial rights or something? 3) When we kill a process and the threads are not joind, do they become zombies? First, don't kill or cancel threads, ask them to kill themselves. If you

For a website, I need to be able to start and stop a daemon process. What I am currently doing is exec("sudo /etc/init.d/daemonToStart start"); The daemon process is started, but Apache/PHP hangs. Doing a ps aux revealed that sudo itself changed into a zombie process, effectively killing all further progress. Is this normal behavior when trying to start a daeomon from PHP? And yes, Apache has the right to execute the /etc/init.d/daemonToStart command. I altered the /etc/sudoers file to allow it to do so. No, I have not allowed Apache to be able to execute any kind of command, just a limited