zombie mutation

Linux security strategy-zombie process-general Linux technology-Linux programming and kernel information. The following is a detailed description. I. Process concept: When running any UNIX/Linux Command, shell will create at least one process to run the command (this process is also called the parent process ), therefore, any program running in UNIX/Linux systems can be called a process. But the process is not a program, the process is dynamic, and t

Basic concepts: In Unix/Linux, a child process is created by a parent process and a new process is created by a child process. The end of the Child process and the running of the parent process are asynchronous processes, that is, the parent process can never predict when the child process ends. After a process terminates its work, its parent process needs to call wait () or waitpid () to obtain the termination status of the child process. Orphan process: if a parent process exits and one or mor

The eye of death seventh customs clearance steps are also more, there are 35 steps, time in 120 seconds. Because the customs clearance procedures are more complex, small series with the figure to show you the path, directly to the map position, the next step when the zombie will move, so this road is safe, we do not worry. Starting position Avoid the first zombie path The

Zombie Process: The child process terminated, but the parent process did not reclaim the resource PCB for the child process. Make it a zombie processOrphan process: The parent process ends with the child process, which causes the child process to lose the parent process, and this time the subprocess is adopted by the 1th process init process as an orphan processTo prevent the above two cases, we should be s

1. What is a zombie process?A zombie process is a child process that ends before the parent process, but the parent process does not reclaim the child process and frees the resources that the child process occupies. The zombie process also occupies a slot in the process table, but the process table has limited capacity, and the defunct process not only consumes s

ObjectiveIf the parent process does not end, and the child process terminates. The child process will always be a zombie process until the parent process calls the wait function to reclaim the child process or the parent process terminates.This article will provide two ways to deal with this problem.Method One: Parent process recovery methodThe wait function blocks its callers until one of its child processes terminates. Therefore, the parent process

Zombie Network is listed as one of the top ten computer viruses, Microsoft This July has a reward for 250,000 of dollars to capture zombie network operators, it can be seen how abhorrent. Recently, there is news that the Kaspersky Lab teamed up with Microsoft, Kyrus Tech, successfully annihilated the infamous Kelihos botnet, and also hit the back of the zombie ne

Here's what I read about 11 years ago in Apue (Advanced Programming for UNIX environments) to understand the orphan process and the zombie process, and to make it easier to remember and explain it in a figurative way. (not necessarily accurate, but I'll post a professional explanation on Wikipedia.) ) Os os like a company, the CEO of the company is the INIT process. Any child process has a parent process, just like any one has a father. T

the background of waitWhen the child process exits, the kernel sends a SIGCHLD signal to the parent process, and the exit of the child process is an asynchronous event (the child process can terminate at any time the parent process runs)When a child process exits, the kernel resets the subprocess to zombie state, a process called a zombie process that retains only the smallest number of kernel data structur

Recently, wrote a pcap aspect of the program, when the program started, there is a daemon monitoring, will restart;The program itself will be multi-threaded monitoring of all active network cards, while using two threads, one to do time-out check, a connection status display;Today in the replacement, found that there is a zombie process this situation occurs, because the internal use of a lot of sleep, maybe you kill the main thread, the child thread