setsockopt

Before entering a variety of powerful raw socket applications, we will first explain how to establish a raw socket and how to use the established raw socket to send and receive IP packets.　　Create raw socketOn Windows, to use raw socket, you must

A summary of the heartbeat mechanism of Linux socket programmingThe purpose of my writing this article is to summarize the use of the heartbeat mechanism, because the last two items of TCP communication have used this method, feel the use of good

First, the purpose of the experiment: The function of this design is to populate a TCP packet and send it to the destination host. Second, the experimental requirements: 1) Run as command line: sendtcp source_ip source_port dest_ip dest_port Where

The tutorial you are reading is: Dialysis ICMP protocol (5): Applying route tracing. Principles:--------Through the introduction in the first four sections, you may have a preliminary understanding of ICMP applications. but before this section, I

Recently, rt_thread, the real-time operating system of Chinese users, was used on stm32f103. Here, we use the Web Hosting process. The most basic select () cannot escape while setsockopt () cannot. The following is an example of your usage. Let's

1. UDP Packet Loss The UDP Intranet transmission that has been plagued for a few days has finally been completed. The key to solving this problem is the call of setsockopt, which sets the receiving buffer. The problem is that the host sends UDP

1. The need for TCP keepalive1) Many firewalls are automatically closed for idle sockets2) for non-normal disconnection, the server is not able to detect. In order to reclaim resources, a detection mechanism must be provided.2. Factors that cause

1. Is there a pure virtual constructor in C ++? 2. Does a class in C ++ declare a static member variable? 3. Is it useful to declare a static member function in a class of C ++? 4. How to implement a non-blocking socket? 5. Setsockopt and IOCTL can

Simple use and encapsulation of socket in Linux /* * File function: Simplified socket operation function in Linux * File name: linux_socket.h * Created on: July 15, July 19, 2007 * Creator: wlzqi * Language: c Or C ++ Language * Environment:

Abstract: This paper introduces a new design method of message queue-based duplicate server communication software, which is different from the parallel server and general duplicate server communication software, this new software has the advantage

In normal communication, if the send function is successfully sent, the number of bytes of the sent data is returned. If an error occurs, send returns-1, and the global variable errno is set. In many cases, sending returns-1 because the connection

Htons, Ntohs, htonl, and Ntohl functionsLinux provides 4 functions to complete the conversion between host byte order and network byte order#include uint16_t htons (uint16_t host16bitvalue); uint32_t htonl (uint32_t host32bitvalue); uint16 _t Ntohs (

The application layer uses the following function for each socket to turn on the keepalive mechanism, whose parameters will be configured in the system above.SetSockOpt (RS, Sol_socket, so_keepalive, (void *) &keepalive, sizeof (KEEPALIVE));Note:

In this case, network radio may need to transmit the same data to tens of thousands of users at the same time, which is certainly unreasonable if it is transmitted once per user in the form of transmission we have previously spoken. Therefore,

address multiplexing in the Socket APIThe server side uses so_reuseaddr whenever possible, calling setsockopt to set SO_REUSEADDR socket options before binding. This option allows you to restart the server without having to wait for the time_wait

1. TCP establishes the connection (three times handshake) The following two diagrams explain TCP's three handshake processes from the protocol and interface two angles (respectively from the computer network-Shehiren and UNIX Network Programming

The main purpose of this paper is to get the server sockets and client sockets, and make a simple package, using C language. Tcp_server Server-side FD acquisition is mainly divided into the following steps: 1. Create a socket, this step

This article refers to the first chapter of Python network programmingImport socketHelp (socket)Functions:Socket ()--Create a new socket objectSocketpair ()--Create a pair of new socket objects [*]FROMFD ()--Create a socket object from an open file

the semantics of Read/write: Why is it blocked. Let me start with write: #include ssize_t Write (int fd, const void *buf, size_t count); First, write returns successfully, except that the data in the BUF is replicated to the TCP send buffer in

Handling of BIND errors:Bind:address already in useCause: The operating system does not immediately release the portResolution one: Wait for a period of time to run the network programResolution two: Set by setsockopt, the key code is as follows.1