Linux socket通讯Demo

Server端

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main()
{
	int server_sockfd,client_sockfd;
	int server_len,client_len;
	struct sockaddr_in server_address;
	struct sockaddr_in client_address;

	unlink("server_socket");
	server_sockfd = socket(AF_INET, SOCK_STREAM, 0);
	server_address.sin_family = AF_INET;
	server_address.sin_addr.s_addr = htonl(INADDR_ANY);
	server_address.sin_port = htons(5000);
	server_len = sizeof(server_address);
	bind(server_sockfd, (struct sockaddr *)&server_address, server_len);
	listen(server_sockfd, 5);
	while(1) {
		char ch;
		printf("server waiting\n");

		client_len = sizeof(client_address);
		client_sockfd = accept(server_sockfd,
			(struct sockaddr *)&client_address, &client_len);
		read(client_sockfd, &ch ,1);
		ch++;
		write(client_sockfd, &ch, 1);
		close(client_sockfd);
	}
}

Client 端：

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <netinet/in.h>

int main(int argc, char *argv[])
{
	int sockfd;
	int len;
	struct sockaddr_in address;
	int result;
	char ch = 'A';
	if(argc != 2)
    	{
        	printf("\n Usage: %s <ip of server> \n",argv[0]);
        	return 1;
    	}	
	sockfd = socket(AF_INET,SOCK_STREAM,0);
	address.sin_family = AF_INET;
	address.sin_port = htons(6666);
	if(inet_pton(AF_INET, argv[1], &address.sin_addr)<=0)
    	{
        	printf("\n inet_pton error occured\n");
        	return 1;
    	}
	len = sizeof(address);

	result = connect(sockfd,(struct sockaddr *)&address,len);
	if(result == -1) {
		perror("oops: client1");
		exit(1);
	}
	write(sockfd , &ch, 1);
	read(sockfd, &ch, 1);
	printf("char from server = %c\n", ch);
	close(sockfd);
	exit(0);
}

编译：gcc socket_server_ip.c -o socket_server_ip

gcc socket_client_ip.c -o socket_client_ip

运行：

./socket_server_ip

另开一个窗口或换一台机器；./socket_client_ip 10.131.0.11

10.131.0.11 为server端IP，同一台机器上运行可输入127.0.0.1