/*                                    * Main idle loop of postmaster                                    */
static int
ServerLoop(void)
{
    ......                       nSockets = initMasks(&readmask);                                for (;;)                                {
        ...                                        if (pmState == PM_WAIT_DEAD_END)                            {...        }                            else                            {
            ...                                                     selres = select(nSockets, &rmask, NULL, NULL, &timeout);   }
        ...                           /* Now check the select() result */                            if (selres < 0)                            {                            if (errno != EINTR && errno != EWOULDBLOCK)                        {
                ......           return STATUS_ERROR;                    }                        }                            /*                            * New connection pending on any of our sockets? If so, fork a child * process to deal with it.                            */                            if (selres > 0)                            {                            int            i;            for (i = 0; i < MAXLISTEN; i++)                        {                        if (ListenSocket[i] == PGINVALID_SOCKET)                    break;                if (FD_ISSET(ListenSocket[i], &rmask))                    {                    Port       *port; port = ConnCreate(ListenSocket[i]);                if (port)                {                BackendStartup(port);   /*To fork a new backend */
      StreamClose(port->sock);            ConnFree(port);            }                }                    }                        }                                    ......                        }
}