game zombie

1 Basic Overview 1.1 orphan process and zombie processAfter the parent process creates the child process, the ideal state is that the child process ends, the parent process reclaims the child process and frees the resources that the child process occupies, whereas in fact, the parent-child process is an asynchronous process, and the two who end first are not smooth, and can usually call the wait () or waitpid () statement through the parent process to

HanoverLink: Defunct process zombie processWhen testing a Demo of a directfb+gstreamer-based video network system, a large number of the statements that were invoked by the system, such as system ("./play") in the menu code, were executed several times, in this case, in the Ps-ef list There are a lot of defunct processes that are harmful to the running of the program. Supposedly the system's source code should already contain wait, but also can not ex

Preface recently, due to studying java, many labels will be opened in chrome, and some extensions will be used to remind you of some emails and other things. The results will often get inexplicably stuck to my desktop program, the reason is that the Zombie process is generated. I will not talk about the cause of Zombie here. I just want to briefly talk about how to find the

entrusted to the INIT processAbc++; printf ("child:%d,parent:%d\n", Getpid (), Getppid ()); printf ("abc:%d", ABC); Sleep ( -); } printf ("Fork after...\n");}Before Fork pid:27709parent:pid:27709Abc:11child:27710,parent:27709Fork after ...DISDA 27710 1 0 10:47 pts/1 00:00:00./reviewDISDA 27713 25948 10:47 pts/3 00:00:00 ps-efWe execute the program because the child process enters sleep (100), and the parent process exits first. With the PS-EF command we can know that at this point the parent pr

ObjectiveThis article will be divided into two parts, the first part of the implementation of a pair of concurrent back-up Server/client program (see the previous article in this part can not see the repetition); The second part is the server to add a zombie subprocess automatic cleanup mechanism.So how does the server implement concurrency? How can there be a zombie process? What is a

When we look at host performance using the top command, we see a zombie keyword in the second row that represents the meaning of the zombie process. Zombie Process: When a process exits, it sends a SIGCHLD signal to the parent process, always ignoring the SIGCHLD signal by default, at which point the process state remains in memory until the parent process collec

Linux kernel source code learning: Zombie processes, Linux kernel source code botnets Orphan and botnets After a normal sub-process fork parent process, the two establish a parent-child relationship. When the child process ends, it notifies the parent process, clears the memory occupied by the child process, and leaves its exit information (exit code) in the kernel. If the child process runs smoothly, it is 0; if an error or exception occurs, it is a

Many zombie processes in busybox are obvious to all. Why? This should begin with the concept of a zombie process. The so-called zombie process is actually a process of no one to recycle, and there is nothing left. There is only the empty shell task_struct, all fields in task_struct are lost and released, but task_struct is still in use, occupying the space of siz

Today, while maintaining the server, we found 5 nova-novncproxy of zombie processes. 26327? s 0:05 \_/usr/bin/python/usr/bin/nova-novncproxy--config-file=/ etc/nova/nova.conf4765? z 0:00 \_ [Nova-novncproxy] 1. Rewrite the parent process and bury it after the child process dies. The concrete approach is to take over the SIGCHLD signal. After the child process dies, the SIGCHLD signal is sent to the parent process, and after the parent proc

What is a zombie process ?First the kernel releases all the stores used by the terminating process (called the exit system call), closes all open files, and so on, but the kernel holds a certain amount of information for each terminating child process. This information includes at least the process ID, the terminating state of the process, and the CPU time used by the process, so this information is available when the parent process that terminates th

As Halloween gets more popular, we want to talk about a very common problem in software development: Zombie code. Almost all of the code libraries that have been exposed are scattered with small chunks of code, or even large chunks of it being commented out. This is the zombie code. This feature is currently disabled. Jimmy must have been drunk when he wrote this piece of code. You might think the

Zombie Processes (Zombie process) The process has finished executing, but the resource occupied by the process has not been reclaimed. This process is called a zombie process . At the time each process exits, the kernel frees all of the process's resources, contains open files, occupies memory, and so on. however , it still retains certain info

Generally, the parent process of the Fork sub-process has ended, and the sub-process cannot release resources, forming a zombie process.The process has died, but does not release system resources, including memory and some system tables. If there are many such processes, it will cause system problems. If the process state shown by PS-el is Z, It is a zombie process.S indicates the sleep state; D indicates t

What botnets? Here is a brief introduction. You can find the details on the Internet: BotnetsThis means that the child process has exited, but the parent process has not exited, and wait is not performed on the child process. As a result, the resources of the child process are not released and are still occupied in the memory, as a result, it becomes a process like a zombie (a zombie cannot act, but occup

OrderThe Zombie (zombie) process is simply: when a child process exits, the parent process does not properly handle the sigchild signal it emits, causing the child process to stay in a zombie state to wait for its parent process to corpse, and the child process in this state is a zombie process.Because concurrent serve

How to delete zombie viruses, how to check bots, and how to delete zombie Trojans. How Kingsoft drug overlord anti-virus experts summed up the six major phenomena of "bots" computers. When netizens encounter these phenomena, they need to be vigilant and remove the Trojans: Symptom 1: Abnormal logon reminders for QQ and MSN When you log on to QQ, the system prompts that the last logon IP address is totally i

The so-called zombie problem is that the application crashes because the programmer references the "zombie object" in the code. The so-called zombie object is a deallocated object. The retaincount of these objects is already 0. through normal means, we cannot track and observe them in debug. If zombie enabled is enable

Causes and solutions for zombie Processes Generation of zombie processes: When a process creates a sub-process, its operation is asynchronous. That is, the parent process cannot predict when the child process will end. If the child process is too busy to wait for wait, when the child process ends, will the status information at the end of the sub-process be lost? In this case, unix provides a mechanism to e

Solution to a large number of zombie processes on Linux servers How do I view zombie processes in Linux and how many zombie processes are counted? # Ps-ef | grep defunct Or find a process in the Z state. Z indicates zombie process, which means a zombie process. In additi

LINUX Zombie process processing 1 What is a zombie process: when a child process ends before the parent process, but the parent process does not recycle the child process, release the resources occupied by the child process, in this case, the child process becomes a zombie process. If the parent process exits and the child process is taken over by init, after the