socket

都是新建个socket
然后
客户端是connect ＋write+read
服务端是bind＋while (read +write)


client:

#include <stdio.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <string.h>
int main(){
    char* echo_host="192.168.1.105";
    int echo_port =7777;
    int sockfd;
    struct sockaddr_in *server=(struct sockaddr_in*)malloc(sizeof(struct sockaddr_in));
    server->sin_family=AF_INET;
    server->sin_port=htons(echo_port);
    server->sin_addr.s_addr=inet_addr(echo_host);

    sockfd=socket(AF_INET,SOCK_STREAM,0);
	printf("Connected to %s\n\n",echo_host);
//-------------------上面相同------
    printf("Numeric:%u\n",server->sin_addr);
	connect(sockfd,(struct sockaddr*)server,sizeof(*server));
	char* msg="hello world";
	printf("\nSend:%s \n",msg);
	write(sockfd,msg,strlen(msg));
	char* buf=(char*)malloc(1000);
	int bytes=read(sockfd,(void*)buf,1000);
	printf("\nBytes res %u\n",bytes);
	printf("\nBuff %s res\n",buf);
	close(sockfd);
}

server.c:

#include <stdio.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <string.h>
int main(){
	char* echo_host="192.168.1.105";
	int echo_port =7777;
	int sockfd;
	struct sockaddr_in *server=(struct sockaddr_in*)malloc(sizeof(struct sockaddr_in));
	server->sin_family=AF_INET;
	server->sin_port=htons(echo_port);	
	server->sin_addr.s_addr=inet_addr(echo_host);

	sockfd=socket(AF_INET,SOCK_STREAM,0);
//-------------------上面相同--[color=red]-[/color]---

	if(bind(sockfd,(struct sockaddr*)server,sizeof(*server))){
		printf("bind failed\n");
	}
	listen(sockfd,SOMAXCONN);
	int clientfd;
	struct sockaddr_in* client=(struct sockaddr_in*)malloc(sizeof(struct sockaddr_in));
	int client_size=sizeof(*client);
	char* buf=(char*)malloc(1000);
	int bytes;
	printf("wait for connection to port %u\n",echo_port);

	clientfd=accept(sockfd,(struct sockaddr*)client,&client_size);
	//printf("Connected to %s:%u\n\n",inet_ntoa(client->sin_addr),ntohs(client->sin_port));
	printf("Numeric:%u\n",ntohl(client->sin_addr.s_addr));
	while(1){
		bytes=read(clientfd,(void*)buf,1000);
		if(bytes<=0){
			close(clientfd);
			printf("coneecton close\n");
			exit(0);
		}
		printf("bytes received:%u\n",bytes);
		printf("text %s\n",buf);
		write(clientfd,buf,bytes);
	}

}