linux network programming book

and pseudo-random numbers (1) random numbers are randomly occurring, and there is no regular set of sequences. (2) True completely random numberThe column does not exist, it is just an ideal situation. We usually use random numbers to get a pseudo-random number sequence only through some algorithms. (3) We usually refer to random numbers, which basically mean pseudo-random numbers. 3.3.5.2, Linux random number correlation API (1) Multiple calls to th

Network Debugging Tools Tcpdumpfunction : Print header information in the specified network interface that matches the Boolean expressionKey Words :① Type: Host (default), NET, port210.27. 48.2 // indicates that it is a host computer 202.0. 0.0 // indicates that a network at // indicate port number② confirm Transmission direction: SRC, DST

In Linux, network programming is implemented through socket. network programs call socket and several other functions to return a communication file descriptor. we can regard this descriptor as a common file descriptor for operation, this is the benefit of Linux's device independence. we can exchange data between netwo

Linux Network Programming: original socket programming and instance analysis (1) I. What can the original socket do? Generally, the programmer receives two types of sockets: (1) stream Socket (SOCK_STREAM): a connection-oriented Socket for connection-oriented TCP Service applications; (2) datagram Socket (SOCK_DGRAM):

", "UNIX Network Programming"Author W.richard Stevens personal website http://www.kohala.com/Master Works Department Classic, unfortunately 1999 to another world to maintain UNIX ...Description: Engage in Linux network programming, want to learn TCP/IP must look at the maste

This book mainly shares the author's experience in implementing multi-thread and network programming in the company's internal distributed service system, and introduces C ++Many of the design decisions in this book are made in this application scenario. This book does not e

when we call SendTo, the Linux system is automatically assigned to the client at the bottom, the allocation of the port is randomly allocated, that is, each time the system to the port is different. UDP Server programWhat are the requirements for UDP network programs to collect data? 1) Determine the IP address 2) determine the port (ports) This is just like, I want to receive

Linux Network Programming (iii)--TCPPurpose: The learning of technology is limited, the spirit of sharing is unlimited.1.TCP segment FormatAndUDPprotocol also has the source port number and the destination port number, the communication between the two sides byIPaddress and port number identification. +bit sequence number, +confirm the Sequence number, window si

is to turn the domain name into a network-recognizable machine structure pointer, and the second is to convert the IP form; The key point is the structure body hostent---netdb.h header file returned This function converts a character IP to a 32-bit ip--string to a in_addr struct. The purpose of this type of function is to obtain server information: The server structure is as follows: ---------------------------------------------------I'm a spli

(1) The IPV4 socket address structure is also commonly referred to as the "Internetwork Sockets address Structure", which is named "Sockaddr_in", and the is defined in the struct sockaddr_in{ uint8_t Sin_len;//Entire Sock Addr_in structure length sa_family sin_family;//Specify this address family, which must be set to Af_inet nbsp in_port_t Sin_port; Port struct in_addr sin_addr//piv4 address Char sin_sero[8]; Temporarily unused, typically set to 0

Network programming in embedded linux (4) -- UDPServer programming the design of TCP-based communication programs is introduced earlier. the TCP protocol implements the connection, reliability, and transmission control protocol for transmitting data streams, however, UDP is non-connected and unreliable. Because UDP doe

UDP Broadcast CommunicationUnicast: Single-to- one , TCP and UDP can be donebroadcast : Only UDP is complete. The sender sends only one packet when broadcasting, but the switch on the network forwards the broadcast packet to all ports by default. Routers do not forward any broadcast packets by default. Therefore, the broadcast is within the LAN range.multicast : Only UDP can be completed. Sends a message to a host of the same multicast group. Video te

, which can be a hostname or binary address information. IPV4 for Point 10, or 16 for IPV6Parameter 2: The port number of a decimal number or service name, such as FTP, HTTPParameter 3: The caller fills in the type of information it wants to return.Parameter 4: Holds the pointer address information that returns the ADDRINFO structure list.void Freeaddrinfo (struct addrinfo *ai): The res of the getaddrinfo function is obtained dynamically and needs to be returned to the system using the functionc

Tags: CEP soc Write add communication socket Listen Server TCPProcessServers: ServerCreate socket Sockets ()Populating the server network information structure Body sockaddr_inBind a socket to a server network information struct bind ()Set the socket to passive listening state listen ()Blocking the connection request waiting for the client accept ()To communicate recv ()/send () or read ()/write ()Clients:

stream number is:%d\n", num); } printf ("Select success...\n"); //sleep (1); for(i=0; i1; i++) { if(Fd_isset (I, Tempfs)) { if(i = =Stdin_fileno) {fgets (buf,sizeof(BUF), stdin); printf ("Input:%s", BUF); } if(i = =listen_fd) {Length=sizeof(CLIENTADDR); printf ("Connecting ..."); CONNECT_FD= Accept (LISTEN_FD, (SA *) clientaddr, length); printf ("connected!\n"); Fd_set (CONNECT_FD,Rdfs); if(Max_fd connect_fd) {MAX_FD=connect_fd; }

); } memset (AMP;ADDR,0,sizeof(addr)); Addr.sin_family=af_inet; if(Inet_aton (argv[1], (structIN_ADDR *) addr.sin_addr.s_addr) = =0) {perror (argv[1]); Exit (Exit_failure); } addr.sin_port= Htons (Atoi (argv[2])); //Create socket if(SOCK_FD = socket (af_inet, SOCK_DGRAM,0)) == -1) {perror ("Socket"); Exit (Exit_failure); } //initiate a connection to the server?? It's not TCP, is it? if(ret = connect (SOCK_FD, (structSOCKADDR *) addr,sizeof(addr)) == -1) {perror ("Connect"); Exi

) {Err_log ("fail to Recvfrom");}printf ("From clientaddr:%s\n", buf);strcat (BUF, "from server ...");if (strncmp (buf, "Quit", 4) = = 0){Break}if (SendTo (SOCKFD, buf, N, 0, (struct sockaddr *) clientaddr, Addrlen) {Err_log ("fail to SendTo");}}Close (SOCKFD);return 0;}Among them client.c are as follows:#include #include #include #include #include #include #include #define ERR_LOG (ErrLog) do{perror (ErrLog); exit (1);} while (0)#define N 128int main (int argc, const char *argv[]){int sockfd;st

Linux Network programmingThe theoretical basis of network programming essentialsNetwork model, address, port, TCP/IP protocolThe TCP/IP protocol is currently the most widely used network communication protocol in the worldMost applications in the daily use of this series of

When it comes to Linux operating systems, you cannot fail to mention network technology. The Linux system itself is a network of products, it can be on the network for people to download freely, and be modified and perfected. The Linux