setsockopt

The Strace command is a powerful tool that can display all system calls made by user space programs. Strace Displays the parameters of these calls and returns the value of the symbolic form. Strace receives information from the kernel and does not

All along, the personal concept of only non-blocking socket will produce eagain error, meaning is currently not read and write, as long as you continue to try again. When we recently redis an error in the module to correct this concept of my mistake.

Reprint http://blog.sina.com.cn/s/blog_4fc7368a0100okbq.html 1, multicast and broadcast need to be in the LAN to achieve, and also to see whether the Linux system support multicast and broadcast: Ifconfig up broadcast multicast mtu:1500 metric:

1. The internal mechanism by which Linux performs write on the socket. It may involve some basic I/O mechanisms, and I can't figure out what's going on, running server and client separately, and then terminating the server so that client continues

Article title: improve socket performance on Linux-accelerate network applications. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded

Set SO_RECVBUF and SO_SENDBUF socket options, sorecvbuf Control socket behavior (such as modifying the buffer size ). Int getsockopt (int sockfd, int level, int optname, void * optval, socklen_t * optlen ); Int setsockopt (int sockfd, int level, int

{Code ...} the above is the php code, and then I strace it, the result is as follows {code ...} after sending the get command in line 3, poll is called. The timeout value is the value of line 0, 1572, and the value of timeout is 2000. Why do I need

The first thing to look at is TCP/IP protocol, which involves four layers: link layer, network layer. Transport layer, application layer.The data frame of the Ethernet (Ethernet) in the link layerIP packets on the network layerTCP or UDP packets in

The user interface for the Linux socket. This BSD-compatible socket is a unified interface between the user process and the Kernel network protocol stack, each protocol module belonging to a different protocol family, such as Pf_inet, Pf_ipx,

First, TCP with the UDP the DifferenceConnection-based and no-connectionRequirements for system resources (more TCP, less UDP)The structure of the UDP program is relatively simpleFlow mode and Datagram modeTCP guarantees data correctness, UDP may

Network Exception checking 2Author Cpplive | Posted on 2012-02-17Article Category: C language, Linux, Windows, applications and programming, networkingFirst, the purpose of this articleIn practical project applications involving network programming,

Monitoring Server Port Programmer's house Author: ominous Date: 21:10:00 # Include "stdafx. H"# Include # Include // # Include # Include # Include DWORD winapi clientthread (lpvoid lpparam ); Int main (

$host = '127.0.0.1';$port = 8888;$key = 'group:32149904:binding';$redis = new Redis();$redis->pconnect($host, $port);$obj = $redis->get($key);echo $obj, PHP_EOL; PHP code is the above, and then I strace a bit, the result is as follows 1565 Connect (3

This title uses two Don's and three names. It is actually the same thing, but there are different sayings on the Internet, in addition, it seems that some people call TCP drilling. (My friend Niu asked me, "Do you want to punch the hole? Would you

# Include # Include # Include # Include # Include "mstcpip. H"# Pragma comment (Lib, "ws2_32.lib ")# Define seq 0x28376839 Socket sockraw = invalid_socket,Socklisten = invalid_socket;Struct sockaddr_in DEST; Bool scanok = false;Char *

The socket buffer size provided by the system is 8 K. You can set it to 64 K, especially when transmitting real-time videos. When the socket sends data, it first sends the data to the socket buffer, and then receives the function to retrieve the

Http://blog.csdn.net/cyblueboy83/article/details/1791713   (1) applications can use TCP socket to send application data to the network by calling send (write, sendmsg, etc, the TCP/IP protocol stack then sends the application data (TCP datagram)

This is the first article in a series about how to use various available interfaces to develop network programs for Linux. Like most Unix-based operating systems, Linux supports using TCP/IP as the local network transmission protocol. In this series,

You must know the tcp_keepalive settings and tcp_keepalive settings. 1. parameter settings View related parameters Sysctl-a | grep tcp_keepaliveNet. ipv4.tcp _ keepalive_intvl = 30Net. ipv4.tcp _ keepalive_probes = 2Net. ipv4.tcp _ keepalive_time = 1

In Linux, the implementation source code of TCP keep alive is analyzed, and keepaliveKeep Alive under TCP We often say that the TCP keep alive is to ensure the validity of the connection, send a test packet at a certain interval, and confirm