unix network programming volume 1

Client and server program templates supported by network programming: 1. connect multiple clients to the server at the same time, that is, the service program can serve multiple clients at the same time; 2. The server supports socket pair reuse, that is, even in the time_wait status, the server can be restarted; 3. The server can check whether the client is disco

, generally use I/O multiplexing; It is possible for a client to handle multiple sockets at the same time, but relatively rare; If a server is to process TCP, but also processing UDP, the general need to use I/O multiplexing. If a server is to handle multiple services or multiple protocols, I/O multiplexing is generally used. I/O multiplexing is not limited to network programming, and many important app

);//Lock the thread, and if the mutex has been locked, the program is blocked at that point until the other thread unlocks it to the resource. while(value//If Vallue is within the predetermined range if(value%2==0){//value is evenprintf"fun2 value =%d\n",value);value++; Pthread_cond_signal (dan);//Send as a dual signal. Notifies the odd processing thread pthread_fun1 ().}Else{pthread_cond_wait (shuang, mutex);//blocking the program and unlocking the mutex. Wait for the condition vari

Recently in the "UNIX Network Programming" (abbreviated UNP) and "Linux program Design", for the first time in UNP to get the example of the server, practice always a little headache, Because the author contains all of the declarations in the unp.h, resulting in the subsequent writing of the code will be dependent on the header file, and learn not to call the cor

Table of Contents 1 UNIX network programming-lock (2) 1.1 semaphores API 1.2 Implementation of semaphores mutex lock 1.2.1 The member variables are as follows: 1.2.2 implement the following member functions: 1.3 Implementation of the semaphore read/write lock 1.3.1 member var

data to the client segment at intervals, so_keepalive is insufficient. Because the so_keepalive option refers"There is no data exchange in any direction of this interface". In the Linux 2.6 series, the above understanding is that as long as the set interface that opens the so_keepalive option detectsData transmission or data receivingIt is considered as data exchange. That is, in the case of abnormal disconnection (the server does not receive the "fin" or "rst" packet), the upper-layer program

Break; } } if(i = =Open_max) {cout"Too many clients"Endl; return-1; } client[i].events=Pollrdnorm; if(I >Maxi) {Maxi=i; } if(--nready 0) { Continue; } } for(i =1; I ) { if((SOCKFD = CLIENT[I].FD) 0) { Continue; } if(Client[i].revents (Pollrdnorm |Pollerr)) {

bufferFlags: usually directly specified as 0, or it can be one or more of the constant values listed in Figure 1.1.To: A set of interface address structures that point to the protocol address of a datagram receiver, which means that the recipient's basic information is obtained by this parameterAddrlen: This integer represents the size of the to structure, which can be calculated by sizeofReturn Value Description:successful return of read/write bytes, failed return-1Attention:

); struct sockaddr_in servaddr; servaddr.sin_family=AF_INET; inet_pton(AF_INET,"0.0.0.0",servaddr.sin_addr); servaddr.sin_port=htons(13); Bind(listenfd,(SA*)servaddr,sizeof(servaddr)); Listen(listenfd,10); time_t ticks; int i; char buf[1024]; for(;;) { int client_fd=accept(listenfd,NULL,0); ticks=time(NULL); snprintf(buf,sizeof(buf),"

dual-stack customers can communicate with IPV4 dual-stack customers depends on the implementation, that is, if getaddrinfo obtains the IPV6 address of the IPV4 map, it can communicate. If you get a true IPv6 address, you cannot communicate.5. In fact, the problem is to achieve the IPv6 of the host, as far as possible to achieve IPv4, so that we can see, remove the second row and column of the table, the table (none) will not be. Only (None *) left.Five, IPV6 address test macroThere are some IPV

For UDP network programming of Unix domain sockets, the server side is as follows: #include Client Program: #include UDP network programming for Unix domain sockets

1, first in the official website http://www.unpbook.com/unpv13e.tar.gz download source files2, Decompression: TAR-XZVF unpv13e.tar.gz3, CD unpv13e;./configure4, CD Lib; Make5, the above generated a static library of LIBUNP.A, copy the generated static library to the System Library directory (/USR/LIB), CD ... sudo cp libunp.a/usr/lib/6, put Unp.h and config.h into the System reference directory for quick reference (note: Config.h in the Lib directory)

Unix network programming 2 Reading Notes Chapter 2-System v ipc, unixipc1. Overview Three types of System v ipc: System V message queue, System V semaphore, and System V shared memory Zone System v ipc shares many similar points between the functions that access them and the information maintained by the kernel for them. This chapter describes all these common

error messages, This is related to whether the kernel is sending ICMP messages back to the UDP socket interface. I did the experiment under Ubuntu and found that this ICMP message was not returned.Attention:If you call the Connect function in a TCP program, the server side does not run the program, and connect returns an error directly (because three handshakes are established at this time), but no error is returned in UDP. several issues to be aware of:1