what ppid

#include #include#include#includeintMainvoid) { //signal (SIGCHLD, sig_ign); intI=0; printf ("i son/pa ppid pid fpid\n"); //Ppid refers to the parent process PID of the current process//PID refers to the PID of the current process,//fpid refers

The Linux process has a certain relationship with each other. For example, on the basis of the Linux process, we see that each process has a parent process, and all processes are rooted in the init process, forming a tree structure. We are here to

1. General description of the orderMan Psps-report a snapshot of the current processes.The PS command is used to report the process status of the current system. You can break and delete unnecessary programs with the KILL command at any time. The PS

Nginx Workflow FlowchartHTTP part of the workflow is roughly like a master to open multiple workers, network IO is generally used epoll to achieve the high concurrency of a worker, file IO with Sendfile,aio and other efficient steps Io, to achieve

about the order in which programs are run We know that Linux is a multiplayer environment, the output from top we also found that the system at the same time there are a lot of programs in operation, but most of the program is in hibernation

/proc//maps View how the virtual address space of the process is used. The file has 6 columns, respectively: Address: library in process address range Permissions: Virtual memory permissions, r= read, w= write, x=,s= share, p= private; Offset:

Directory Parent and child processes Service Job Management (& | Jobs | FG | BG | Kill PS command Priority and Nice priorities Parent and child processesA child process is a program derived from a parent process.

SELinux Security System Basics in CentOS This article will record some experiences and experiences of learning SELinux... 1. Introduction to SELinux SELinux (Secure Enhanced Linux) Security Enhancement Linux is a new Linux security policy mechanism

Unlike many other software systems, nginx only has several command line parameters and is configured in the configuration file (IMAGINE ). [# Options][# Example][# Using signals to load new configurations][# Upgrade utnbotf to new binary

At the end of the article "using an independent PID namespace to prevent mistaken killing processes", I encountered a problem, that is, the process in the parent PID namespace cannot use the PID value written through ECHO $> $ pidfile into the

  If any thread in the process calls exit, _ exit, _ exit, the whole process is terminated. This is not the thread termination, but the process, which terminates all threads in the process.   1. Thread termination method: A single thread can exit in

Home is well aware that PHP does not support multithreading. But it's really a headache for someone who needs to be like a multithreaded feature. Fortunately, there are several scenarios that can be solved, such as multithreading capabilities. Here

Linux Process ManagementIntroduction when we run a program, Linux will create a special environment for the program, which contains all the resources required to run the program, to ensure that the program can run independently without interference

Linux multi-process learning and Linux Process Learning1Linux Process Overview a process is a process executed once by a program. It is essentially different from a program. The program is static. It is a set of commands stored on disks in sequence.

(1) exec Function Description The fork function is used to create a child process, which is almost a copy of the parent process. Sometimes we want the child process to execute another program, the exec function family provides a method to start

/** Simple fork usage */# include # include # include int main () {pid_t child; if (child = fork () =-1) {perror ("fork"); exit (exit_failure );} else if (child = 0) {puts ("in child"); printf ("\ tchild pid = % d \ n", getpid ()); printf ("\

2015.3.3Tuesday CloudyIPC: Inter-process communicationPipe: Nameless Pipes: can only be used between processes that have affinityFIFO: Well-known pipeline: can make each other two processes communicate with each other, the famous pipeline can be

about the order in which programs are runWe know that Linux is a multi-worker environment, from the top of the output we also found that the system at the same time there are a lot of programs in operation, but most of the programs are in

It is clear that php does not support multithreading. However, it is a headache for people who need a multi-threaded feature. Fortunately, there are several solutions that can be solved, similar to multithreading. The following are my summary of the

basic knowledge of the processThe PS command in Linux is the abbreviation for process status. The PS command is used to list those processes that are currently running on the system. The PS command lists the current snapshots of those processes,