connect timeout
int error = 0;
fd_set rset;
fd_set wset;
int n;
const SOCKET sock = m_Socket;
// set the socket as nonblocking IO
const int flags = fcntl (sock, F_GETFL, 0);
fcntl(sock, F_SETFL, flags | O_NONBLOCK);
errno = 0;
// we connect, but it will return soon
n = ::connect(sock, addr, size_addr);
if(n < 0) {
if (errno != EINPROGRESS) {
return -1;
}
} else if (n == 0) {
goto done;
}
FD_ZERO(&rset);
FD_ZERO(&wset);
FD_SET(sock, &rset);
FD_SET(sock, &wset);
struct timeval tval;
tval.tv_sec = timeout;
tval.tv_usec = 0;
// We "select()" until connect() returns its result or timeout
n = select(sock + 1, &rset, &wset, 0, timeout ? &tval : 0);
if(n == 0) {
errno = ETIMEDOUT;
return -1;
}
if (FD_ISSET(sock, &rset) || FD_ISSET(sock, &wset)) {
socklen_t len = sizeof(error);
if (getsockopt(SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
return -1;
}
} else {
return -1;
}
done:
// We change the socket options back to blocking IO
if (fcntl(sock, F_SETFL, flags) == -1) {
return -1;
}
return 0;
http://ko.w3support.net/index.php?db=so&id=735249
