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Directory 1. Srand () and Rand () functions and random number seeds 2. Daemon and PID files 3. Signal processing when initializing the server 4. Log stack information when the program Coredump StackTrace 1. Srand () and

The difference between fcntl (), LOCKF, and Flock in Linux The difference between fcntl (), LOCKF and Flock--lvyilong316 What is the difference between these three functions, which are all about locking up a file? First flock and Fcntl are system

1. Experiment 1: Signal communication Description: use signal communication to communicate between parent and child processes and brother processes. Solution: Send a SIGCHLD signal to the parent process at the end of the sub-process, the parent

1. Overview The MPs queue has no name. It is applicable to kinship-related processes. FIFO refers to first in first out, which has a path name associated with it, so that it can be used between unrelated processes. It is also called named pipe. Both

This article is senlie original, reproduced Please retain this address: http://blog.csdn.net/zhengsenlie Next, I will introduce several different versions of the same tcp client program, including the stop and other versions, the Select and

  1. Problem Introduction The I/O command set of UNIX systems evolved from COMMANDS IN Maltics and earlier systems, the mode is open-write-read-close ). When a user process performs an I/O operation, it first calls "open" to obtain the right to use

This article introduces the ARM-based network image transmission technology. There are two threads: one is to complete the acquisition of USB camera images, and the other is to achieve remote transmission through the network. The image collection

This article introduces the ARM-based network image transmission technology. There are two threads: one is to complete the acquisition of USB camera images, and the other is to achieve remote transmission through the network. The image collection

1. Overview TCP client/server model in this Chapter 2. TCP echo server program 1). main Function   #include "unp.h"int main(int argc, char **argv){ int listenfd, connfd; pid_t childpid; socklen_t clilen; struct sockaddr_in

In network programs, a server is usually used to process multiple clients. In order to make requests from multiple clients, the server programs have different processing methods. Currently, the most common server models are as follows: Cyclic server:

Copied from outside China, this vulnerability can stop all Apache servers. It has not been tested. If you are interested, you can test it! It doesn't matter if you don't understand text. You don't know, Google knows! ---------------------------------

1, Pid_t PID; Int listenfd, connfd; Listenfd = socket (...); BIND (...);Listen (...); While (1){Connfd = accept (....);If (pid = fork () = 0){// Why Should listenfd be disabled for the derived self-process? If it is disabled, the parent process

/******************** Server Model **************** **/ 1. Cyclic server: the cyclic server can only respond to one client request at a time; 2. Concurrent Server: the concurrent server can request multiple clients at the same time. ***********

The Linux system provides powerful and reliable network services, and management programs manage the services. For example, we are familiar with Web, FTP, and email, which can be run independently or called by the daemon inetd and run very well. But

Tip: Change the token from tinyproxy and pay tribute to the original author! At the beginning of a program, you can define the following constants: # Define maxservices128/* Maximum number of service calls for each process to prevent installation

I. Files in Linux There are four types of files: common files, directory files, link files, and device files. 1. Common files Is the most commonly used file, including text files, shell scripts, binary executable and various types of data. Ls-LH

I. Signal * * Int sigaction (SIGINT, & act, 0); Act struct: struct sigaction Act; {act. sa_handler = ABC; sigemptyset (& act. sa_mask); Act. sa_flags = 0 ;} * Int kill (pid_t PID, int sig) unsigned int alarm (unsigned int seconds); pause ()

The shared memory zone is the fastest available in the IPC format. Once such a memory zone is mapped to the address space of the process that shares it, the data transfer between these processes will no longer involve the kernel (here, the meaning

The producer-consumer model is one of the typical problems in the operating system. The model includes the producer process and consumer process. Producer process production information. For example, it can be a process for mathematical calculation.

Process usage summary and process usage Summary When a knowledge point is not used for a long time, it is easy to forget. This is a normal rule. So it is necessary for us to study at the time. This article will review and review previous learning