有什么想法,为什么当服务器在客户端等待select时写入套接字时,select永远不会完成?
我正在使用C语言在套接字之间进行通信。我的客户端可以成功连接到服务器。
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recv阻塞并监听数据时,一切工作正常:
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select,它似乎无法读取任何数据。如果我将STDIN添加到fd_set中,我可以强制它从套接字读取数据,但是select似乎无法从socket_desc读取数据时触发...?
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");
}
}