Linux迭代回声服务器端

echo_server.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define BUF_SIZE 1024
void error_handling(char *message);

int main(int argc, char *argv[]) {
	int serv_sock;
	int clnt_sock;
	char message[BUF_SIZE];
	int str_len;
	int i;

	struct sockaddr_in serv_addr;
	struct sockaddr_in clnt_addr;
	socklen_t addr_size;

	if(argc!=2) {
		printf("Usage : %s <port>\n", argv[0]);
		exit(1);
	}

	serv_sock = socket(PF_INET, SOCK_STREAM, 0);
	if(serv_sock==-1)
		error_handling("socket() error");

	addr_size = sizeof(struct sockaddr_in);
	
	memset(&serv_addr, 0, addr_size);
	serv_addr.sin_family = AF_INET;
	serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
	serv_addr.sin_port = htons(atoi(argv[1]));
	
	if(bind(serv_sock, (struct sockaddr*)&serv_addr, addr_size)==-1)
		error_handling("bind() error");
		
	if(listen(serv_sock, 5)==-1)
		error_handling("listen() error");
		
	for(i=0; i<5; i++) {
		clnt_sock = accept(serv_sock, (struct sockaddr*)&clnt_addr, &addr_size );
		if(clnt_sock==-1)
			error_handling("accept() error");
		else
			printf("Connected client %d\n", i+1);
			
		while((str_len=read(clnt_sock, message, BUF_SIZE))!=0)
			write(clnt_sock, message, str_len);
			
		close(clnt_sock);
	}
	
	close(serv_sock);
	return 0;
}


void error_handling(char *message) {
	fputs(message, stderr);
	fputc('\n', stderr);
	exit(1);
}

gcc echo_server.c -o eserver
./eserver 9190
//Connected client 1
//Connected client 2
//Connected client 3

Linux迭代回声客户端

echo_client.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define BUF_SIZE 1024
void error_handling(char *message);

int main(int argc, char *argv[]) {
	int sock;
	char message[BUF_SIZE];
	int str_len;

	struct sockaddr_in addr;
	socklen_t addr_size;
	
	if(argc!=3) {
		printf("Usage : %s <IP> <port>\n", argv[0]);
		exit(1);
	}

	sock = socket(PF_INET, SOCK_STREAM, 0);
	if(sock==-1)
		error_handling("socket() error");

	addr_size = sizeof(addr);
	
	memset(&addr, 0, addr_size);
	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = inet_addr(argv[1]);
	addr.sin_port = htons(atoi(argv[2]));
	
	if(connect(sock, (struct sockaddr*)&addr, addr_size)==-1)
		error_handling("connect() error");
	else
		puts("Connected......");
	
	while(1) {
		fputs("Input message(Q to quit): ", stdout);
		fgets(message, BUF_SIZE, stdin);

		if(!strcmp(message, "q\n") || !strcmp(message, "Q\n")
			break;
		
		write(sock, message, strlen(message));
		str_len = read(sock, message, BUF_SIZE-1);	
		message[str_len] = 0;	
		printf("Message from server : %s\n", message);
	}
	
	close(sock);
	return 0;
}


void error_handling(char *message) {
	fputs(message, stderr);
	fputc('\n', stderr);
	exit(1);
}

gcc echo_client.c -o eclient
./eclient 127.0.0.1 9190

Windows迭代回声服务器端

echo_server_win.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winsock2.h>

#define BUF_SIZE 1024
void ErrorHanding(char *message);

int main(int argc, char *argv[]) {
	WSADATA wsaData;
	SOCKET hServSock;
	SOCKET hClntSock;
	char message[BUF_SIZE];
	int strLen;
	int i;
	SOCKADDR_IN servAddr;
	SOCKADDR_IN clntAddr;
	int szAddr;

	if(argc!=2) {
		printf("Usage : %s <port>\n", argv[0]);
		exit(1);
	}

	if(WSAStartup(MAKEWORD(2, 2), &wsaData)!=0)
		ErrorHanding("WSAStartup() error!");
	
	hServSock = socket(PF_INET, SOCK_STREAM, 0);	
	if(hServSock==INVALID_SOCKET)
		ErrorHanding("socket() error");

	szAddr = sizeof(SOCKADDR_IN);

	memset(&servAddr, 0, szAddr);
	servAddr.sin_family = AF_INET;
	servAddr.sin_addr.s_addr = htonl(INADDR_ANY);
	servAddr.sin_port = htons(atoi(argv[1]));
	
	if(bind(hServSock, (SOCKADDR *)&servAddr, szAddr)==SOCKET_ERROR)
		ErrorHanding("bind() error");
		
	if(listen(hServSock, 5)==SOCKET_ERROR)
		ErrorHanding("listen() error");

	for(i=0; i<5; i++) {
		hClntSock = accept(hServSock, (SOCKADDR *)&clntAddr, &szAddr);	
		//if(hClntSock==INVALID_SOCKET)
		if(hClntSock==-1)
			ErrorHanding("accept() error");
		else
			printf("Connected client %d\n", i+1);
			
		while((strLen=recv(hClntSock, message, BUF_SIZE, 0))!=0)	
			send(hClntSock, message, strLen, 0);
		
		closesocket(hClntSock);
	}
	
	closesocket(hServSock);
	WSACleanup();
	return 0;
}

void ErrorHanding(char *message) {
	fputs(message, stderr);
	fputc('\n', stderr);
	exit(1);
}

cl /EHsc echo_server_win.c /Fe:eServerWin.exe /link ws2_32.lib
eServerWin 9190

Windows迭代回声客户端

echo_client_win.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winsock2.h>

#define BUF_SIZE 1024
void ErrorHanding(char *message);

int main(int argc, char *argv[]) {
	WSADATA wsaData;
	SOCKET hSock;
	char message[BUF_SIZE];
	int strLen;
	SOCKADDR_IN servAddr;
	int szAddr;

	if(argc!=3) {
		printf("Usage : %s <IP> <port>\n", argv[0]);
		exit(1);
	}

	if(WSAStartup(MAKEWORD(2, 2), &wsaData)!=0)
		ErrorHanding("WSAStartup() error!");
	
	hSock = socket(PF_INET, SOCK_STREAM, 0);	
	if(hSock==INVALID_SOCKET)
		ErrorHanding("socket() error");
		
	szAddr = sizeof(SOCKADDR_IN);
	
	memset(&servAddr, 0, szAddr);
	servAddr.sin_family = AF_INET;
	servAddr.sin_addr.s_addr = inet_addr(argv[1]);
	servAddr.sin_port = htons(atoi(argv[2]));
	
	if(connect(hSock, (SOCKADDR *)&servAddr, szAddr )==SOCKET_ERROR)
		ErrorHanding("connect() error");
	else
		puts("Connected.......");
		
	while(1) {
		fputs("Input message(Q to quit): ", stdout);
		fgets(message, BUF_SIZE, stdin);

		if(!strcmp(message, "q\n") || !strcmp(message, "Q\n")
			break;
		
		send(hSock, message, strlen(message), 0);
		strLen = recv(hSock, message, BUF_SIZE-1, 0);
		message[strLen] = 0;
		printf("Message from server: %s", message);
	}
	
	closesocket(hSock);
	WSACleanup();
	return 0;
}

void ErrorHanding(char *message) {
	fputs(message, stderr);
	fputc('\n', stderr);
	exit(1);
}

cl /EHsc echo_client_win.c /Fe:eClientWin.exe /link ws2_32.lib
eClientWin 127.0.0.1 9190