C Socket Programming server client

最新推荐文章于 2019-12-22 19:07:03 发布

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#socket #c语言

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本文提供了一组C语言编写的简单Server和Client程序，用于测试Socket连接中的数据传输速度。通过记录客户端发送数据到服务器接收完毕的时间，帮助理解网络延迟并探讨性能优化的方法。

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用C语言socket编程写简单的server和client程序，目的为了测试一次socket连接中，数据从client端开始发送至server端接受完毕所耗的时间，以及找到原因和提升性能。这里贴出代码，make以后，直接运行server和client即可。

sever.c

/************************************
 * For msmr
 * server_s.c
 * tesing the speed of socket
 * 2015-02-04
 * author@tom
************************************/
#include <stdio.h>  
#include <string.h>
#include <sys/types.h>  
#include <sys/socket.h>  
#include <netinet/in.h>  
#include <arpa/inet.h>  
#include <netinet/tcp.h>
  
#define MAX_SIZE 300


int main(int argc, char *argv[])  
{  
    int size = 300;
    int server_sockfd; 
    int client_sockfd; 
    int len;  
    struct sockaddr_in my_addr;  
    struct sockaddr_in remote_addr; 
    int sin_size;  
    char buf[MAX_SIZE];   
    memset(&my_addr,0,sizeof(my_addr));  
    my_addr.sin_family=AF_INET;  
    my_addr.sin_addr.s_addr = htonl(0x7f000001); // 127.0.0.1
    my_addr.sin_port=htons(9023);  
      
    if((server_sockfd=socket(PF_INET,SOCK_STREAM,0))<0)  
    {    
        perror("socket");  
        return 1;  
    }  
   
    if (bind(server_sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr))<0)  
    {  
        perror("bind");  
        return 1;  
    }  
      
    listen(server_sockfd,5);  // the length of listening queue is 5
      
    sin_size=sizeof(struct sockaddr_in);  
      
    if((client_sockfd=accept(server_sockfd,(struct sockaddr *)&remote_addr,&sin_size))<0)  
    {  
        perror("accept");  
        return 1;  
    }  

    // set TCP_NODELAY
    int enable = 1;
    if(setsockopt(client_sockfd, IPPROTO_TCP, TCP_NODELAY, (void*)&enable, sizeof(enable)) < 0) // TCP_QUICKACK
        printf("TCP_NODELAY SETTING ERROR!\n");

    struct timeval accept_t;
    gettimeofday(&accept_t,NULL);
    printf("Warning: server accept timestamp  %lu.%06lu\n", accept_t.tv_sec, accept_t.tv_usec);

    printf("accept client %s\n",inet_ntoa(remote_addr.sin_addr));  

    len=recv(client_sockfd,buf,MAX_SIZE,0);

    struct timeval start_t;
    gettimeofday(&start_t,NULL);
    printf("Warning: server finishes reading timestamp  %lu.%06lu\n", start_t.tv_sec, start_t.tv_usec);

    close(client_sockfd);  
    close(server_sockfd); 
 
    return 0;  
}

client.c

/************************************
 * For msmr
 * client_s.c
 * tesing the speed of socket
 * 2015-02-04
 * author@tom
************************************/
#include <stdio.h>  
#include <string.h>
#include <sys/types.h>  
#include <sys/socket.h>  
#include <netinet/in.h>  
#include <arpa/inet.h>  
#include <netinet/tcp.h>
  
#define MAX_SIZE 300

int main(int argc, char *argv[])  
{  
    int client_sockfd;  
    int len;  
    struct sockaddr_in remote_addr;  
    char buf[MAX_SIZE];   
    memset(&remote_addr,0,sizeof(remote_addr));  
    remote_addr.sin_family=AF_INET;  
    remote_addr.sin_addr.s_addr=inet_addr("127.0.0.1"); 
    remote_addr.sin_port=htons(9023);  
      
    if((client_sockfd=socket(PF_INET,SOCK_STREAM,0))<0)  
    {  
        perror("socket");  
        return 1;  
    }  
      
    if(connect(client_sockfd,(struct sockaddr *)&remote_addr,sizeof(struct sockaddr))<0)  
    {  
        perror("connect");  
        return 1;  
    }  
    printf("connected to server\n");  
    // set TCP_NODELAY
    int enable = 1;
    if(setsockopt(client_sockfd, IPPROTO_TCP, TCP_NODELAY, (void*)&enable, sizeof(enable)) < 0) //TCP_QUICKACK
        printf("TCP_NODELAY SETTING ERROR!\n");
      
    printf("Enter string to send:");  
    while(scanf("%s",buf) <= 0){}  
  
    
    struct timeval start_t;
    gettimeofday(&start_t,NULL);
    printf("Warning: Client timestamp  %lu.%06lu\n", start_t.tv_sec, start_t.tv_usec);

    send(client_sockfd,buf,(int)strlen(buf),0);  

    close(client_sockfd);

    return 0;  
}

Makefile

#! /bin/bash
.PHONY:clean

default:
	gcc -O3 server.c -o server -g
	gcc -O3 client.c -o client -g

clean:
	rm server client