15th Chapter Sockets

Create:

#include <sys/types.h>

#include <sys/socket.h>

int socket (int domain, int types, int protocol);

Domain

Af_unix, af_local//Address family is the file name

Af_inet//ipv4

Af_inet6//ipv6

Types

1. Stream:sock_stream//Flow

2. Datagram:sock_dgram//Datagram

The descriptor returned by the socket, called with Read and write

Close system call ends socket connection

Different domain has different address formats:

Af_unix: Defined in Sys/un.h

Struck Sockaddr_un {

sa_family_t sun_family;

Char sun_path[];

};

Af_inet: Defined in Netinet/in.h

struct SOCKADDR_IN {

short int sin_family;

unsigned short int sin_port;

struct IN_ADDR sin_addr;

}; which

Sruct in_addr {

unsigned long int s_addr;

};

Naming: To use a well-created socket, you need to name it.

#include <sys/socket.h>

int bind (int socket, const struct SOCKADDR *address, size_t Address_len); succes return 0.

To establish a socket queue: save an unhandled request

#include <sys/socket.h>

int listen (int socket, int backlog); The maximum number of backlog bits saved successfully returned 0

Receive connection:

After the server program establishes and names the socket, it can wait for the client to establish a connection to the socket via the Accept system call.

#include <sys/socket.h>

int accept (int socket, STRUCCT sockaddr *sddress, size_t *address_len);

　　　　

15th Chapter Sockets