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我想寫一個簡單的服務器在C玩雙人遊戲。它檢查傳入的連接,如果沒有player1,它會保存player1的文件描述符(稍後用於發送和接收),如果沒有player2,它也會執行相同的操作。我有這個循環設置,我從Here修改。我的問題是我想從一個人那裏得到,併發送給另一個人,但似乎我的任務是無效的。當我嘗試發送給player2時,它失敗或發送垃圾。有時候,發送給player1會發送回服務器(?)。我是否正確使用選擇並循環正確設置文件描述符?對於任何反饋,我們都表示感謝。爲什麼此套接字/文件描述符分配無效?
// add the listener to the master set
FD_SET(listener, &master);
// keep track of the biggest file descriptor
fdmax = listener; // so far, it's this one
// main loop
while (1) {
read_fds = master; // copy it
if (select(fdmax+1, &read_fds, NULL, NULL, NULL) == -1) {
error("select");
}
// run through the existing connections looking for data to read
for(i = 0; i <= fdmax; i++) {
//This indicates that someone is trying to do something
if (FD_ISSET(i, &read_fds)) {
if (i == listener) {
addrlen = sizeof remoteaddr;
newfd = accept(listener, (struct sockaddr *)&remoteaddr, &addrlen);
if (newfd == -1) {
error("accept");
} else {
FD_SET(newfd, &master);
if (newfd > fdmax) {
fdmax = newfd;
}
/* If we have the maximum number of players, we tell if that it's busy */
if (players >= 2) {
toobusy(fdmax); close(fdmax); FD_CLR(fdmax, &master);
} else {
//Problem here?
if (player1_fd == -1) {
player1_fd = newfd;
}
if ((player1_fd != -1) && (player2_fd == -1)) {
player2_fd = newfd;
}
players++;
if (players == 2) {
sendhandles(); //says two players exist
}
}
}
} else {
//Possible problems here
if (i == player1_fd || i == player2_fd) {
receive(i); //Processes the messages
}
}
}
}
}
是的,這是newfd。謝謝! – thomascirca 2012-03-21 03:03:41