socket network programming under Linux C language

Knowledge about the detailed steps to establish server and associated socket socket I have already mentioned in python socket programming article too, we can see that the origin of a blog content socket connection socket programming, with due if the C related API so here incorporates a network socket programming content written in C language API correlation-based, the following specific implementation, debugging. Article link: http://www.cnblogs.com/uestc-mm/p/7296083.html

Server Server.c program content:

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/************************************************************************************************************************
1、int socket(int family,int type,int protocol)
family:
    指定使用的协议簇:AF_INET (IPv4) AF_INET6 (IPv6) AF_LOCAL (UNIX Protocol) AF_ROUTE (routing socket) AF_KEY (secret key socket)
of the type:
    Use specified socket type: SOCK_STREAM (byte stream socket) SOCK_DGRAM 
Protocol: 
    If the socket is a socket type is not the original, it is this parameter is 0 
2, int the bind (int sockfd, struct the MYADDR the sockaddr * , int addrlen) 
sockfd: 
    socket function returns the socket descriptor 
myaddr: 
    is a pointer to the local IP address structure pointer 
myaddrlen: 
    structural length 
struct the sockaddr { 
    unsigned Short sa_family like; // type of communication protocol family AF_xx 
    char sa_data [14]; @ 14 byte protocol address, the socket comprises an IP address and port number 
}; 
struct {the sockaddr_in 
    Short int the sin_family; // type of communication protocol group 
    unsigned short int sin_port; // port number 
    struct in_addr sin_addr; // IP address 
    unsigned char si_zero [8]; // 0 is filled with the length kept the same structure sockaddr 
};
. 3, Connect int (int sockfd, const struct the sockaddr * serv_addr, the socklen_t addrlen) 
sockfd: 
    Socket function returns a socket descriptor 
serv_addr: 
    Server IP address structure pointer 
addrlen: 
    the length of the structure pointer 
4, int listen (int sockfd, int backlog) 
sockfd: 
    socket socket functions described Binds bind character 
backlog: 
    setting the maximum number of connections can be connected to the client, when multiple client requests to the server, receive the impact of this value. The default value 20 is 
. 5, Accept int (int sockfd, struct cliaddr the sockaddr *, * the socklen_t addrlen) 
sockfd: 
    Socket function after listen socket descriptor 
cliaddr: 
    client socket interface address structure 
addrlen: 
    Client Address structural length 
6 , int the send (int sockfd, const void * msg, int len, int flags) 
7, int recv (int sockfd, void * buf, int len, unsigned int flags) 
sockfd:
    socket function socket descriptor 
msg: 
    pointer data is transmitted 
buf: 
    storing the received data buffer 
len: 
    length of the data, the flags is set to 0 
***************** ************************************************** ************************************************** *** * / 
int main ( int argc, char * the argv []) 
{ 
    int FD, new_fd, struct_len, numBytes, I;
     struct the sockaddr_in The server_addr;
     struct the sockaddr_in client_addr;
     char BUFF [BUFSIZ]; 

    server_addr.sin_family = AF_INET; 
    The server_addr .sin_port = htons ( 8000);
    server_addr.sin_addr.s_addr = INADDR_ANY;
    bzero(&(server_addr.sin_zero), 8);
    struct_len = sizeof(struct sockaddr_in);

    fd = socket(AF_INET, SOCK_STREAM, 0);
    while(bind(fd, (struct sockaddr *)&server_addr, struct_len) == -1);
    printf("Bind Success!\n");
    while(listen(fd, 10) == -1);
    printf("Listening....\n");
    printf("Ready for Accept,Waitting...\n");
    new_fd = accept(fd, (struct sockaddr *)&client_addr, &struct_len);
    printf("Get the Client.\n");
    numbytes = send(new_fd,"Welcome to my server\n",21,0); 
    while((numbytes = recv(new_fd, buff, BUFSIZ, 0)) > 0)
    {
        buff[numbytes] = '\0';
        printf("%s\n",buff);
            if(send(new_fd,buff,numbytes,0)<0)  
            {  
                perror("write");  
                return 1;  
            }  
    }
    close(new_fd);
    close(fd);
    return 0;
}

 The client Client.c program content:

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>

int main(int argc,char *argv[])
{
    int sockfd,numbytes;
    char buf[BUFSIZ];
    struct sockaddr_in their_addr;
    printf("break!");
    while((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1);
    printf("We get the sockfd~\n");
    their_addr.sin_family = AF_INET;
    their_addr.sin_port = htons(8000);
    their_addr.sin_addr.s_addr=inet_addr("127.0.0.1");
    bzero(&(their_addr.sin_zero), 8);
    
    while(connect(sockfd,(struct sockaddr*)&their_addr,sizeof(struct sockaddr)) == -1);
    printf("Get the Server~Cheers!\n");
    numbytes = recv(sockfd, buf, BUFSIZ,0);//接收服务器端信息  
    buf[numbytes]='\0';  
    printf("%s",buf);
    while(1)
    {
        printf("Entersome thing:");
        scanf("%s",buf);
        numbytes = send(sockfd, buf, strlen(buf), 0);
            numbytes=recv(sockfd,buf,BUFSIZ,0);  
        buf[numbytes]='\0'; 
        printf("received:%s\n",buf);  
    }
    close(sockfd);
    return 0;
}

 

 Use gcc compiler client and server program is compiled and interpreted:

gcc -o Master Server.c
gcc -o Slave Client.c