我有一个非常简单的客户端和服务器代码:客户端无法与服务器C连接(Socket编程)
客户
int sockfd = 0;
int bytesReceived = 0;
char recvBuff[BUFSIZE];
memset(recvBuff, '0', sizeof(recvBuff));
struct sockaddr_in serv_addr;
printf("here i am\n");
/* Create a socket first */
if((sockfd = socket(AF_INET, SOCK_STREAM, 0))< 0){
printf("\n Error : Could not create socket \n");
return 1;
}
fprintf(stderr, "connection stats\n");
fprintf(stderr, "connecting to %d - %s \n",port,server);
/* Initialize sockaddr_in data structure */
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(port); // port
serv_addr.sin_addr.s_addr = server;
printf(" attempting connection %s:%d\n", server, port);
/* Attempt a connection */
int con = connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr));
printf("Error %d\n", con);
exit(-1);
和服务器
int listenfd = 0;
int connfd = 0;
struct sockaddr_in serv_addr;
char sendBuff[BUFSIZE];
int numrv;
listenfd = socket(AF_INET, SOCK_STREAM, 0);
printf("Socket retrieve success\n");
memset(&serv_addr, '0', sizeof(serv_addr));
memset(sendBuff, '0', sizeof(sendBuff));
printf("here 2\n");
serv_addr.sin_family = AF_INET;
printf("here 3\n");
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
printf("here 4\n");
serv_addr.sin_port = htons(port);
printf("here 5\n");
int optval = 1;
printf(" opening port %d\n", port);
setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR,
(const void *) &optval, sizeof(int));
bind(listenfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr));
printf("binded\n");
while (1) {
connfd = accept(listenfd, (struct sockaddr *) NULL, NULL);
printf("connfd %d", connfd);
close(connfd);
sleep(1);
}
客户端输出:
here i am
connecting to 8888 - localhost
attempting connection localhost:8888
服务器输出
Socket retrieve success
here 2
here 3
here 4
here 5
opening port 8888
binded
,等待像几分钟后..我注意以下事项: 客户:
here i am
connecting to 8888 - localhost
attempting connection localhost:8888
Error -1
服务器:
Socket retrieve success
here 2
here 3
here 4
here 5
opening port 8888
binded
connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd -1connfd
其中由-1,我可以猜测连接失败。 我不知道我失踪了什么?
你应该后'connfd%D',要不然就把一个'\ N' printf的输出将被缓冲,当它发生时你不会看到它。你也可以调用'fflush'来打印缓冲输出 – Eregrith
@Eregrith:你是对的..所以基本上,连接失败瞬间..但我不知道..为什么服务器不接受客户端连接.. – Fraz
看看'errno'和'perror'也许可以帮助,将它与[connect()手册](http://linux.die.net/man/2/connect) – Eregrith