Shulou(Shulou.com)06/02 Report--

/ * *

* function: create sockets and specify protocol and type at the same time

* # include

* family (protocol suite): AF_INET (IPv4 protocol) AF_INET6 (IPv6 protocol)

* type (socket type): SOCK_STREAM (streaming socket) TCP communication usage

SOCK_DGRAM (Datagram socket) UDP communication usage

SOCK_RAW (original socket)

* protocol: this parameter is 0. 0 if the socket type is not the original socket.

* return value: success: non-negative socket file descriptor

Failed:-1

* int socket (int family,int type,int protocol)

, /

/ * *

* function: bind the address information stored in the corresponding address structure to the socket. Mainly server-side sockets need to be bound, client sockets generally do not need to bind, the kernel will automatically assign addresses to sockets

The file descriptor returned successfully by the * sockfd:socket () function

* my_addr: bind the structure that stores address information

* addrelen: the size of the storage address information structure

* returned value: success: 0

Failed:-1

* int bind (int sockfd,struct sockaddr * my_addr,int addrlen)

, /

Struct sockaddr {

Unsigned short sa_family; / / protocol suite AF_XXX

Char sa_data [14]; / / 14-byte protocol address

}

Struct sockaddr_in {

Short int sin_family; / / protocol suite

Unsigned short int sin_port; / / Port number short integer occupies 2 bytes and 16 bits

Struct in_addr sin_addr; / / IP address occupies 4 bytes and 32 bits

Unsigned char sin_zero [8]; / / fill 0, occupy 8 bytes to keep struct sockaddr and struct sockaddr_in structures the same size

}

Struct in_addr {

Unsigned long sprinter addr; / / 32-bit ip address

}

Struct sockaddr_in is usually used to save a network address, and when used, it is forcefully converted to a pointer of type struct sockaddr.

/ * *

* # include

* function: client establishes a connection to the server

* int connect (int sockfd,struct sockaddr * serv_addr,int addrlen)

* returned value: success: 0

Failed:-1

, /

/ * *

* function: set the socket to listen mode (passive mode) and prepare to receive requests from the client.

* backlog: the maximum number of requests allowed in the request queue. The default value for most systems is 5.

* int listen (int sockfd,int backlog)

* returned value: success: 0

Failed:-1

, /

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