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任何想法为什么当服务器在客户端等待时写入套接字select,选择永不完成?使用select来等待客户端套接字上的数据
我使用c来在套接字之间进行通信。我的客户端连接到我的服务器罚款。
socket_desc=socket(AF_INET,SOCK_STREAM,0);//create the socket descriptor
client->address.sin_addr.s_addr = inet_addr(ipAddress);
client->address.sin_family = AF_INET;
client->address.sin_port = htons(port);
bind(socket_desc,&address,sizeof(address));
connect(socket_desc, &address, sizeof(address));
当我使用的recv阻塞和监听数据,一切正常:
int bytesRead = 1;
while(bytesRead){
int bufsize=1024;
char *buffer=malloc(bufsize);
bytesRead = recv(socket_desc, buffer, bufsize, 0);
printf("CLIENT RECV: %s", buffer);
}
如果我尝试使用选择,它似乎并没有读取任何数据。如果我将STDIN添加到fd_set,我可以强制它从套接字中读取,但select似乎不会从socket_desc读取数据中触发...?
int running = 1;
while(running){
/* wait for something to happen on the socket */
struct timeval selTimeout;
selTimeout.tv_sec = 2; /* timeout (secs.) */
selTimeout.tv_usec = 0; /* 0 microseconds */
fd_set readSet;
FD_ZERO(&readSet);
FD_SET(STDIN_FILENO, &readSet);//stdin manually trigger reading
FD_SET(socket_desc, &readSet);//tcp socket
int numReady = select(3, &readSet, NULL, NULL, &selTimeout);
//IT ONLY GETS PAST SELECT ON RETURN FROM THE KEYBOARD
if(numReady > 0){
char buffer[100] = {'\0'};
int bytesRead = read(socket_desc, &buffer, sizeof(buffer));
printf("bytesRead %i : %s", bytesRead, buffer);
if(bytesRead == 0){
running = FALSE;
printf("Shutdowning client.\n");
}
}
另外值得注意的是,在多个套接字上选择时,您应该检查套接字ID是否使用FD_ISSET设置 – vmpstr 2011-01-25 02:28:45