fork 0

Recently in the study of UNP, hereby recorded.1. TCP Callback Server program#include"Unp.h"voidStr_echo (intsockfd) {ssize_t n; CharBuf[maxline];again: while((n = Read (SOCKFD, buf, MAXLINE)) >0) writen (SOCKFD, buf, N); if(N 0&& errno =

Single-instance Implementation of daemon _ not peaceful _ Baidu Space Single-instance Implementation of daemon To work properly, the daemon should be implemented as a single instance, that is, to run only one copy of the daemon at any time,

I. Process Fundamentals process : A process is the concept of an operating system, and whenever we execute a program, a process is created for the operating system, along with the allocation and release of resources. A process can be

Single-process programming: Sequential execution of data synchronization complexity low-use singleMulti-process programming: Simultaneous execution of data asynchronous complexity high versatility1. The advantage of multi-process is that the

Nginx uses the multi-process master/worker structure, the worker process number is the CPU number is the highest efficiency, nginx through the affinity for each worker process binds a CPU, avoids the process switching to bring the consumption,

The File descriptors is an integer table memory-managed object that can be read and written by the process.A process can get the file descriptors by opening the files directory or device by creating a pipelineor copy an already existing

Original: http://www.cnblogs.com/mickole/p/3188321.html, Guardian process overviewLinux Daemon (daemon) is a special process running in the background. It is independent of the control terminal and periodically performs some sort of task or waits to

2015.3.4Wednesday Cloudyinterprocess communication: IPCFile object: Record file descriptor, file switch, etc.IPC Identifier: System global serial numberTwo processes to communicate, open is the only object to communicate, through the key

13.1: IntroductionDaemons also call the daemon process (daemon) A long-lived process. They often start when the system is bootstrap and terminate only when the system shuts down. Because they do not have control terminals, they are running in the

The C language under Linux can use fork () to establish a child process.The fork function returns two values, and returns 0 for the child process; The parent process, which returns the child process ID. So withif (fork () ==0){The code snippet

1 Create two sub-processes using the fork function. Sends a message to the second child process in the first child process, and the second child process comes out and processes it.2 in the parent process, pipe communication is not applicable, so

#include #include#include#include#includestring.h>#include#includeintMain () {pid_t pid1,pid2; intpipe_fd[2]; Charw_buffer[ -],r_buffer[ -]; intLen1,len2; /*Create a pipeline*/ if(Pipe (PIPE_FD) 0) {printf ("Pipe Create error\n"); return-1; } /

DemandWhen the client connects to the server, the server transfers the file to the client and implements the file download.IdeasServer-side, the main process is responsible for listen. Within the loop, the main process will fork out the grandson to

19:22:01 2014-08-27Introduction:Previously the functions of wait waitpid and exit were only generally understood, but looking at the aof and Rdb 2 persistence of Redis to handle the completion of the child process run out and what the parent process

Daemon processdaemons are long-lived processes that often start when the system is bootstrap and terminate only when the system shuts down. Because they do not have control terminals, they are running in the background. UNIX systems consist of a

The so-called concurrent server is at the same time can handle requests from multiple clients; A circular server is a request that the server can respond to only one client at a time. And for TCP and UDP sockets, the two servers are implemented in

**************************************************************************************************The POSIX semaphore semaphore is a primitive that is used to provide synchronization between different threads of different processes or a given

What is a process? When a user-typed command executes a program, it initiates a process for the system. However, unlike the program, in this process, the system may need to start one or more processes to complete independent multiple tasks. The main

respect for the success of Labor, reproduced please attach this article link and author: jianfeng_soft@163.com (road) Recently (Friday) in chat with friends, chat to their game service to use a list of functions, naturally next we talked to Redis,

Copy Code code as follows: #include "Wrap.h" #define MYDOMAIN_FLAG "/tmp/.mydomain_log" void Domain_end () {Unlink (Mydomain_flag);} int Domain_init () {int FD;Fd=open (mydomain_flag,o_rdwr| O_creat| o_excl| O_APPEND,0600);if (fd==-1)Err_