客戶端：

#include <stdio.h>?????????????????????????????????????????????????????????????????????????????????????????????????????????????????
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/time.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define SERVPORT 22223
#define MAXDATASIZE 100 //每次最大數據傳輸量

int main(int argc, char *argv[])
{
??? int sockfd, recvbytes;
??? char buf[MAXDATASIZE];
??? char cmd_exit[] = "exit";
??? struct hostent *host = 0;
??? struct sockaddr_in serv_addr;
??? struct in_addr addr;
??? struct timeval start;
??? struct timeval end;

??? if(argc < 2)
??? {
??????? fprintf(stderr, "Please enter the server's hostname!\n");
??????? return -1;
??? }
???
??? addr.s_addr = inet_addr(argv[1]);

??? if((host = gethostbyaddr((char *)&addr, 4, AF_INET)) == NULL)
??? {
??????? printf("gethostbyname error!");
??????? return -1;
??? }
???
??? sockfd = socket(AF_INET, SOCK_STREAM, 0);
???
??? serv_addr.sin_family=AF_INET;
??? serv_addr.sin_port=htons(SERVPORT);
??? serv_addr.sin_addr = *((struct in_addr *) host -> h_addr);
??? bzero( &(serv_addr.sin_zero), 8);

?

??? if(connect(sockfd, (struct sockaddr *) &serv_addr, sizeof(struct sockaddr)) == -1)
??? {
??????? printf("connect error!");
??????? return -1;
??? }

??? if (recv(sockfd, buf, 1024, 0)==-1)
??? {
??????? printf("recv err");
??? }
??? printf("%s\n", buf);

??? close(sockfd);

??? return 0;
}??????????????????????????

服務端：

#include<stdio.h>??????????????????????????????????????????????????????????????????????????????????????????????????????????????????
#include<sys/types.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<netinet/in.h>
#include<string.h>
#include<stdlib.h>
#include<unistd.h>
#include<time.h>
#include<fcntl.h>
#define SERVPORT 22223
#define BACKLOG? 16
#define TRUE???? 1

int main(int argc, char ** argv)
{
??? int sockfd ,client_fd;
??? struct sockaddr_in my_addr;
??? struct sockaddr_in remote_addr;
??? char * buf[1024];

??? if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
??? {
??????? printf("failed to create soket\n");
??????? exit(1);
??? }
???
??? my_addr.sin_family=AF_INET;
??? my_addr.sin_port=htons(SERVPORT);
??? my_addr.sin_addr.s_addr=INADDR_ANY;
???
??? bzero( &(my_addr.sin_zero), 8);

??? int opt=1;
//??? setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt));

??? if(bind(sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr))==-1)
??? {
??????? printf("failed to bind!\n");
??????? exit(1);
??? }

??? if(listen(sockfd,BACKLOG)==-1)
??? {
??????? printf("failed to listen!\n");
??????? exit(1);
??? }

??? char *IP=inet_ntoa(my_addr.sin_addr);
??? printf("%s\n",IP);

??? while(TRUE)
??? {
??????? int sin_size;
??????? sin_size=sizeof(struct sockaddr_in);

??????? if((client_fd=accept(sockfd,(struct sockaddr*)&remote_addr,&sin_size))==-1)
??????? {
??????????? printf("failed to accept!\n");
??????????? close(sockfd);
??????????? close(client_fd);
??????????? exit(0);
??????????? continue;
??????? }

??????? printf(" accept data from %s",inet_ntoa(remote_addr.sin_addr));

??????? if( send(client_fd,"hello,I can listn you!",26,0)==-1)
??????? {
??????????? printf("failed to send!\n");
??????????? close(client_fd);
??????????? exit(0);
??????? }
??? }

??? close(sockfd);
??? return 0;
}????????????????????????????????????????????????????????

總結

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