TCP Network Programming process

TCP Network Programming process

Sockets

STRUCTSOCKADDR{//Universal Socket Data structure

sa_family_tsa_family;//Protocol Family

charsa_data[14];//Protocol Family Data

}

Actual use of sockaddr_in, forced conversion at bind or connect

structsockaddr_in{//Ethernet Socket Data structure

U8sin_len;

u8sin_familly;

U16sin_port;

STRUCTIN_ADDRSIN_ADDR;

CHARSIN_ZERO[8];

}

Server-side: Socket ()->bind ()->listen ()->accept ()->read ()->write ()->close ()

Client: Socket ()->connect ()->write ()->read ()->close ()

Socket () Create socket, return file descriptor

Prototype: intsocket (int domain,int type,int protocol);

Domain setting communication, specifying the protocol family

Pf_unix,pf_local	Local communication
Pf_inet	Ipv4internet protocol
Pf_inet6	Ipv6internet protocol
Pf_ipx
Pf_netlink	Kernel user Interface Devices
pf_x25
pf_ax25
Pf_atmpvc
Pf_appletalk
Pf_packet	Underlying package access

The value and meaning of type

Sock_stream	TCP connections
Sock_dgram	Udp
Sock_seqpacket	Serialization Package
Sock_raw	Provides access to the original network protocol
Sock_rdm	Provides a reliable type of data message, but may have a disorderly sequence of data
Sock_packet	Dedicated type, receiving data from device drivers

protocol specifies the specific type of a protocol,

Bind () binds an address port

Prototype: intbind (int sockfd,const struct sockaddr *my_addr,socklen_t addrlen);

Listen () Listening on the local port

Prototype: intlisten (int sockfd,int backlog);

The backlog represents the length of the client waiting in the queue before the accept process.

Accept ()

Prototype: intaccept (int sockfd,struct sockaddr *addr,socklen_t *addrlen);

Addr is a pointer that returns a pointer to the address of the client.

Connect ()

Prototype: intconnect (int sockfd,struct sockaddr *,int addrlen);

Write ()

Read ()

Close ()

Shutdown ()

Prototype: intshutdown (int s,int how)

Allow more ways to close sockets

Shut_rd	Cut Read
Shut_wr	Cut Write
Shut_rdwr	Cut read and write, same as close ()

Signal:

When trying to write, if the server is closed, get a sigpipe signal and terminate the process

This article is from the "No Front" blog, please be sure to keep this source http://qianyang.blog.51cto.com/7130735/1615335

TCP Network Programming process