Method recvfrom

adapter/micro_thread/micro_thread.cpp:961–1019

}

int MtFrame::recvfrom(int fd, void *buf, int len, int flags, struct sockaddr *from, socklen_t *fromlen, int timeout)
{
    MtFrame* mtframe = MtFrame::Instance();
    utime64_t start = mtframe->GetLastClock();
    MicroThread* thread = mtframe->GetActiveThread();
    utime64_t now = 0;

    if(fd<0 || !buf || len<1)
    {
        errno = EINVAL;
        MTLOG_ERROR("recvfrom failed, errno: %d (%m)", errno);
        return -10;
    }
    
    if (timeout <= -1)
    {
        timeout = 0x7fffffff;
    }

    while (true) 
    {
        now = mtframe->GetLastClock();
        if ((int)(now - start) > timeout)
        {
            errno = ETIME;            
            return -1;
        }        
        
        KqueuerObj epfd;
        epfd.SetOsfd(fd);
        epfd.EnableInput();
        epfd.SetOwnerThread(thread);
        if (!mtframe->KqueueSchedule(NULL, &epfd, timeout))
        {
            MTLOG_DEBUG("epoll schedule failed, errno: %d", errno);
            return -2;
        }

        mt_hook_syscall(recvfrom);
        int n = ff_hook_recvfrom(fd, buf, len, flags, from, fromlen);
        if (n < 0)
        {
            if (errno == EINTR) {
                continue;
            }
            
            if ((errno != EAGAIN) && (errno != EWOULDBLOCK)) 
            {
                MTLOG_ERROR("recvfrom failed, errno: %d", errno);
                return -3;
            }
        }
        else
        {
            return n;
        }        
    }