unix network programming volume 1

main reasons: 1. I think it will certainly be involved in future project development, so there is no need to spend time alone; 2. after I bought the book UNIX network programming, I wanted to use my spare time to study it. However, I usually don't have time to learn such complicated things, I had to configure the Sour

Network Programming (1) -- easy understanding of network resource positioning and Network Programming Network Resources It sounds very difficult to learn

established successfully or an error occurs. For a non-blocking socket, if the connect function is called,-1 (indicating an error) is returned, and the error is einprogress, indicating that the connection is established, started, but not completed. If the return value is 0, the connection has been established, this usually occurs when the server and the customer are on the same host) D) There is a socket error to be processed. Write operations on suc

Socket interface (socket interface) is a set of functions that are combined with UNIX I/O functions to create network applications. Socket interfaces are implemented on most modern systems, including all UNIX variants, Windows, and the Macintosh.1. basic structure of socketsstruct SOCKADDRThis structure is used to stor

Recently began to learn UNIX network programming, the opening of the first program DAYTIMETCPCLI.C compiled run successfully, it took a lot of thought, the problem is summed up for your reference.FreeBSD UNIX System built VMware virtual machine, before the FreeBSD is also small white, although also played Linux, the

One day, when I was restricted by many secular rules and could not do what many normal people could do, I suddenly felt: people should not have come to this world! Since we fell into the ground, we have been destined to suffer a lot in our life... There is always no proper balance between breaking rules and conforming rules. I will still choose to stick to the rules when I think that fox, the female killer in the movie "Assassin's League" (also known as the wanted order), will eventually end the

Now that we are in the 21st century, it is hard to imagine that Java-related books are so scarce, but this is just the case with Java. All the Java-related books were basically published by several Sun engineers, such as the "Hooked on Java" written by Arthur Van Hoff et.al and "The Java" written by Patrick Naughton. Handbook ". Of course, these books fill the gaps in Java, but each book has 3, 400 pages, which assume that readers understand the program, especially object-oriented

UNIX network programming is indeed a rare book. Its advantage lies not only in its thorough theory, but also in its clear programming examples. To put it bluntly, when I first started viewing the three sets of Unix programming, I

process of restarting, the customer did not send text) after restarting, the customer sends the text, but in the server TCP has lost the previous connection information, so in response to an RST, The call returns Econnreset.6) Server main machine: When the normal shutdown, the INIT process usually first send sigterm signal to all processes (can be captured, the default action is to terminate the process, only ignored or processed after no termination, will be terminated by Sigkill), and wait fo

The network printing server makes the printer and host not in a physical location and can be anywhere on the LAN. In addition, a host can mount multiple printers, which can be distributed across different departments as needed. Currently, Network Printer servers are used in business processing systems in the financial industry, and most of these applications are based on TCP/IP protocol.

); } } }}intMainintargcChar**argv) { intSOCKFD; structsockaddr_in servaddr; if(ARGC! =2) {printf ("useage:tcpcli "); Exit (0); } if(SOCKFD = socket (af_inet, Sock_stream,0)) 0) {printf ("socket () error!"); Exit (0); } bzero (AMP;SERVADDR,sizeof(SERVADDR)); Servaddr.sin_family=af_inet; Servaddr.sin_port= Htons (9806); if(Inet_pton (Af_inet, argv[1], AMP;SERVADDR.SIN_ADDR) 0) {printf ("Inet_pton () error!"); Exit (0); } if(Connec

, exec, and exit on IPC objects 1. Considering unknown synchronization variables (mutex lock, condition variable, read/write lock, POSIX memory-based semaphore), calling fork from a process with multiple threads will become messy. 2. System v ipc is not enabled or disabled in three forms. To access these three forms of IPC objects, you only need to know their identifiers, so any process that knows the identifiers can access them. 6. the IPC exampl

manipulation functions:#include void *memset (void *dest, int c, size_t len);void *memcpy (void *dest, const void *SRC, size_t nbytes);int memcmp (const void *PTR1, const void *PTR2, size_t nbytes);the ASCII string---the binary value of the > Network byte order (the value stored in the socket address structure) to convert the internetwork address.#include int Inet_aton (const char *strptr, struct in_addr *addrptr);/** returns:

The following describes how to program the network with simple but typical client and server programs. This section describes the client, a client used to connect to and read the time sent by the server. This involves writing code, so we need Build a UNIX Network Programming Environment The

. The pseudocode is as follows: Int ret = read_timeout (sockfd, 15 ); If (ret = 0) { Readnum = read (sockfd, recvbuff, sizeof (recvbuff )); } Else if (ret =-1 errno = etimedout) { // Time Out dealing. } Okay. Now let's continue watching my server and client programs: Server void str_echo(int sock){ ssize_t n; char buff[1024]; again: while( (n = read(sock, buff, sizeof(buff))) > 0) { fputs(buff, stdout); sleep(3);//for te

is H_ERRNOP, not a global variable H_errnoIt is difficult to confirm the size of this buf. Not good to use.2> we can let the non-reentrant function itself be a new object, and finally return. Instead of returning a global static object. This is what the Getaddrinfo function does.The problem introduced: the space allocated within the function must require the caller to display the release, i.e. call function Freeaddrinfo. Otherwise, it causes a memory leak.Xi. Other

(Clients [ 0 ]. Revents Pollin ){Connfd = accept (listenfd ,( Struct Sockaddr *) cliaddr, socklen );Sprintf (BUF, " Accept form % s: % d \ n " , Inet_ntoa (cliaddr. sin_addr), cliaddr. sin_port );Printf (BUF, "" ); For (I = 0 ; I If (Clients [I]. FD =-1 ){Clients [I]. FD = connfd;Clients [I]. Events = Pollin; Break ;}} If (I = open_max ){Fprintf (stderr, " Too connected connection, more than % d \ n " , Open_max );Close (connfd ); Continue ;}