TCP服务器接受调用不返回

我们需要一些TCP客户端服务器代码的帮助 . 客户端从其connect调用和服务器超时不会从accept返回 . 这是strace .

strace -p 7167 -p 7168 -p 7297
Process 7167 attached - interrupt to quit
Process 7168 attached - interrupt to quit
Process 7297 attached - interrupt to quit
[pid  7167] accept(4,  <unfinished ...>
[pid  7168] accept(4,  <unfinished ...>
[pid  7297] connect(3, {sa_family=AF_INET, sin_port=htons(24465), sin_addr=inet_addr("215.47.142.168")}, 16

我们重新启动了系统，但重启后问题仍然存在 .

可能是SYN Flood问题 . 我们如何处理这种联系？此外，半成连接是否在侦听队列（侦听调用的参数2）中排队，并停止来自任何客户端的任何进一步接受或者TCP是否如何仅阻止该特定客户端 .

这是代码... client.all这是一个返回socket的函数

int sock = socket(nmspace,style,protocol);                         
int ret;
struct hostent *hinfo;                                             
if(sock<0){
    printf("Error occurred while creating socket:%d\n",sock);
    printf("%s\n",strerror(errno));
    return -1;
}
memset(&dest, 0, sizeof(struct sockaddr_in));                      
hinfo = gethostbyname(rmserver);
if(hinfo == NULL)
    printf("getbyname failed!\n");
dest.sin_family = AF_INET;                                          
dest.sin_addr =  *(struct in_addr *)(hinfo->h_addr);               
dest.sin_port = htons(port);                                        
ret = connect(sock, (struct sockaddr *)&dest, sizeof(struct sockaddr)); 
if(ret<0){
    printf("Error occurred while connecting on the socket:%d\n",sock);
    printf("%s\n",strerror(errno));
    close(sock);
    return -1;
}

制作服务器套接字的服务器......所有这些都在一个返回套接字>>>>>>的函数内

struct sockaddr_in serv;    
int mysocket,r;
mysocket = socket(AF_INET, SOCK_STREAM, 0);   
memset(&serv, 0, sizeof(struct sockaddr_in)); 
serv.sin_family = AF_INET;                    
serv.sin_addr.s_addr = INADDR_ANY;            
serv.sin_port = htons(port);                  
r = bind(mysocket, (struct sockaddr *)&serv, sizeof(struct sockaddr)); 
if(r<0) {
    printf("Error occurred binding the socket:%d to the server port:%d\n",mysocket,port);
    printf("%s",strerror(errno));
    close(mysocket);
    return -1;
}
r = listen(mysocket, 5);               
if(r<0) {
    printf("Error occurred while enabling listen on the socket:%d\n",mysocket);
    printf("%s",strerror(errno));
    close(mysocket);
    return -1;
}

服务器接受电话>>>>>>

struct sockaddr_in dest;             
int socksize=sizeof(struct sockaddr_in);
int consocket;
consocket = accept(sock, (struct sockaddr *)&dest, (socklen_t *)&socksize);
if(consocket<0) {
    printf("Error occurred while accepting on the socket:%d\n",sock);
    printf("%s\n",strerror(errno));
}

不使用选择 . 我希望我们不需要它，因为套接字默认是阻塞的 .

欢呼声......拉曼