C++ PJ_STATUS_FROM_OS函数代码示例

/*
 * Callback upon receiving packet from network.
 */
static void on_read_complete(pj_ioqueue_key_t *key, 
                             pj_ioqueue_op_key_t *op_key, 
                             pj_ssize_t bytes_read)
{
    nat_detect_session *sess;
    pj_status_t status;

    sess = (nat_detect_session *) pj_ioqueue_get_user_data(key);
    pj_assert(sess != NULL);

    pj_grp_lock_acquire(sess->grp_lock);

    /* Ignore packet when STUN session has been destroyed */
    if (!sess->stun_sess)
	goto on_return;

    if (bytes_read < 0) {
	if (-bytes_read != PJ_STATUS_FROM_OS(OSERR_EWOULDBLOCK) &&
	    -bytes_read != PJ_STATUS_FROM_OS(OSERR_EINPROGRESS) && 
	    -bytes_read != PJ_STATUS_FROM_OS(OSERR_ECONNRESET)) 
	{
	    /* Permanent error */
	    end_session(sess, (pj_status_t)-bytes_read, 
			PJ_STUN_NAT_TYPE_ERR_UNKNOWN);
	    goto on_return;
	}

    } else if (bytes_read > 0) {
	pj_stun_session_on_rx_pkt(sess->stun_sess, sess->rx_pkt, bytes_read,
				  PJ_STUN_IS_DATAGRAM|PJ_STUN_CHECK_PACKET, 
				  NULL, NULL, 
				  &sess->src_addr, sess->src_addr_len);
    }


    sess->rx_pkt_len = sizeof(sess->rx_pkt);
    sess->src_addr_len = sizeof(sess->src_addr);
    status = pj_ioqueue_recvfrom(key, op_key, sess->rx_pkt, &sess->rx_pkt_len,
				 PJ_IOQUEUE_ALWAYS_ASYNC, 
				 &sess->src_addr, &sess->src_addr_len);

    if (status != PJ_EPENDING) {
	pj_assert(status != PJ_SUCCESS);
	end_session(sess, status, PJ_STUN_NAT_TYPE_ERR_UNKNOWN);
    }

on_return:
    pj_grp_lock_release(sess->grp_lock);
}

/*
 * Callback on new TCP connection.
 */
static void lis_on_accept_complete(pj_ioqueue_key_t *key, 
				   pj_ioqueue_op_key_t *op_key, 
				   pj_sock_t sock, 
				   pj_status_t status)
{
    struct tcp_listener *tcp_lis;
    struct accept_op *accept_op = (struct accept_op*) op_key;

    tcp_lis = (struct tcp_listener*) pj_ioqueue_get_user_data(key);

    PJ_UNUSED_ARG(sock);

    do {
	/* Report new connection. */
	if (status == PJ_SUCCESS) {
	    char addr[PJ_INET6_ADDRSTRLEN+8];
	    PJ_LOG(5,(tcp_lis->base.obj_name, "Incoming TCP from %s",
		      pj_sockaddr_print(&accept_op->src_addr, addr,
					sizeof(addr), 3)));
	    transport_create(accept_op->sock, &tcp_lis->base,
			     &accept_op->src_addr, accept_op->src_addr_len);
	} else if (status != PJ_EPENDING) {
	    show_err(tcp_lis->base.obj_name, "accept()", status);
	}

	/* Prepare next accept() */
	accept_op->src_addr_len = sizeof(accept_op->src_addr);
	status = pj_ioqueue_accept(key, op_key, &accept_op->sock,
				   NULL,
				   &accept_op->src_addr,
				   &accept_op->src_addr_len);

    } while (status != PJ_EPENDING && status != PJ_ECANCELLED &&
	     status != PJ_STATUS_FROM_OS(PJ_BLOCKING_ERROR_VAL));
}

/*
 * pj_ioqueue_recv()
 *
 * Start asynchronous recv() from the socket.
 */
PJ_DEF(pj_status_t) pj_ioqueue_recv(  pj_ioqueue_key_t *key,
                                      pj_ioqueue_op_key_t *op_key,
				      void *buffer,
				      pj_ssize_t *length,
				      unsigned flags )
{
    struct read_operation *read_op;

    PJ_ASSERT_RETURN(key && op_key && buffer && length, PJ_EINVAL);
    PJ_CHECK_STACK();

    /* Check if key is closing (need to do this first before accessing
     * other variables, since they might have been destroyed. See ticket
     * #469).
     */
    if (IS_CLOSING(key))
	return PJ_ECANCELLED;

    read_op = (struct read_operation*)op_key;
    read_op->op = PJ_IOQUEUE_OP_NONE;

    /* Try to see if there's data immediately available. 
     */
    if ((flags & PJ_IOQUEUE_ALWAYS_ASYNC) == 0) {
	pj_status_t status;
	pj_ssize_t size;

	size = *length;
	status = pj_sock_recv(key->fd, buffer, &size, flags);
	if (status == PJ_SUCCESS) {
	    /* Yes! Data is available! */
	    *length = size;
	    return PJ_SUCCESS;
	} else {
	    /* If error is not EWOULDBLOCK (or EAGAIN on Linux), report
	     * the error to caller.
	     */
	    if (status != PJ_STATUS_FROM_OS(PJ_BLOCKING_ERROR_VAL))
		return status;
	}
    }

    flags &= ~(PJ_IOQUEUE_ALWAYS_ASYNC);

    /*
     * No data is immediately available.
     * Must schedule asynchronous operation to the ioqueue.
     */
    read_op->op = PJ_IOQUEUE_OP_RECV;
    read_op->buf = buffer;
    read_op->size = *length;
    read_op->flags = flags;

    pj_mutex_lock(key->mutex);
    pj_list_insert_before(&key->read_list, read_op);
    ioqueue_add_to_set(key->ioqueue, key, READABLE_EVENT);
    pj_mutex_unlock(key->mutex);

    return PJ_EPENDING;
}

/*
 * pj_mutex_unlock()
 */
PJ_DEF(pj_status_t) pj_mutex_unlock(pj_mutex_t *mutex)
{
    pj_status_t status;

    PJ_CHECK_STACK();
    PJ_ASSERT_RETURN(mutex, PJ_EINVAL);

#if PJ_DEBUG
    pj_assert(mutex->owner == pj_thread_this());
    if (--mutex->nesting_level == 0) {
	mutex->owner = NULL;
    }
#endif

    LOG_MUTEX((mutex->obj_name, "Mutex released by thread %s", 
				pj_thread_this()->obj_name));

#if PJ_WIN32_WINNT >= 0x0400
    LeaveCriticalSection(&mutex->crit);
    status=PJ_SUCCESS;
#else
    status = ReleaseMutex(mutex->hMutex) ? PJ_SUCCESS : 
                PJ_STATUS_FROM_OS(GetLastError());
#endif
    return status;
}

/*
 * Poll for the completion of non-blocking connect().
 * If there's a completion, the function return the key of the completed
 * socket, and 'result' argument contains the connect() result. If connect()
 * succeeded, 'result' will have value zero, otherwise will have the error
 * code.
 */
static int check_connecting( pj_ioqueue_t *ioqueue )
{
    if (ioqueue->connecting_count) {
	int i, count;
	struct 
	{
	    pj_ioqueue_key_t *key;
	    pj_status_t	      status;
	} events[PJ_IOQUEUE_MAX_EVENTS_IN_SINGLE_POLL-1];

	pj_lock_acquire(ioqueue->lock);
	for (count=0; count<PJ_IOQUEUE_MAX_EVENTS_IN_SINGLE_POLL-1; ++count) {
	    DWORD result;

	    result = WaitForMultipleObjects(ioqueue->connecting_count,
					    ioqueue->connecting_handles,
					    FALSE, 0);
	    if (result >= WAIT_OBJECT_0 && 
		result < WAIT_OBJECT_0+ioqueue->connecting_count) 
	    {
		WSANETWORKEVENTS net_events;

		/* Got completed connect(). */
		unsigned pos = result - WAIT_OBJECT_0;
		events[count].key = ioqueue->connecting_keys[pos];

		/* See whether connect has succeeded. */
		WSAEnumNetworkEvents((pj_sock_t)events[count].key->hnd, 
				     ioqueue->connecting_handles[pos], 
				     &net_events);
		events[count].status = 
		    PJ_STATUS_FROM_OS(net_events.iErrorCode[FD_CONNECT_BIT]);

		/* Erase socket from pending connect. */
		erase_connecting_socket(ioqueue, pos);
	    } else {
		/* No more events */
		break;
	    }
	}
	pj_lock_release(ioqueue->lock);

	/* Call callbacks. */
	for (i=0; i<count; ++i) {
	    if (events[i].key->cb.on_connect_complete) {
		events[i].key->cb.on_connect_complete(events[i].key, 
						      events[i].status);
	    }
	}

	return count;
    }

    return 0;
    
}

static pj_status_t sock_set_net_service_type(pj_sock_t sock, int val)
{
    pj_status_t status;

    status = pj_sock_setsockopt(sock, pj_SOL_SOCKET(), SO_NET_SERVICE_TYPE,
                                &val, sizeof(val));
    if (status == PJ_STATUS_FROM_OS(OSERR_ENOPROTOOPT))
        status = PJ_ENOTSUP;

    return status;
}

static pj_status_t sock_get_net_service_type(pj_sock_t sock, int *p_val)
{
    pj_status_t status;
    int optlen = sizeof(*p_val);

    PJ_ASSERT_RETURN(p_val, PJ_EINVAL);

    status = pj_sock_getsockopt(sock, pj_SOL_SOCKET(), SO_NET_SERVICE_TYPE,
                                p_val, &optlen);
    if (status == PJ_STATUS_FROM_OS(OSERR_ENOPROTOOPT))
        status = PJ_ENOTSUP;

    return status;
}

/*
 * Callback on received packet.
 */
static void on_read_complete(pj_ioqueue_key_t *key, 
			     pj_ioqueue_op_key_t *op_key, 
			     pj_ssize_t bytes_read)
{
    struct udp_listener *udp;
    struct read_op *read_op = (struct read_op*) op_key;
    pj_status_t status;

    udp = (struct udp_listener*) pj_ioqueue_get_user_data(key);

    do {
	pj_pool_t *rpool;

	/* Report to server */
	if (bytes_read > 0) {
	    read_op->pkt.len = bytes_read;
	    pj_gettimeofday(&read_op->pkt.rx_time);

	    pj_turn_srv_on_rx_pkt(udp->base.server, &read_op->pkt);
	}

	/* Reset pool */
	rpool = read_op->pkt.pool;
	pj_pool_reset(rpool);
	read_op->pkt.pool = rpool;
	read_op->pkt.transport = &udp->tp;
	read_op->pkt.src.tp_type = udp->base.tp_type;

	/* Read next packet */
	bytes_read = sizeof(read_op->pkt.pkt);
	read_op->pkt.src_addr_len = sizeof(read_op->pkt.src.clt_addr);
	pj_bzero(&read_op->pkt.src.clt_addr, sizeof(read_op->pkt.src.clt_addr));

	status = pj_ioqueue_recvfrom(udp->key, op_key,
				     read_op->pkt.pkt, &bytes_read, 0,
				     &read_op->pkt.src.clt_addr, 
				     &read_op->pkt.src_addr_len);

	if (status != PJ_EPENDING && status != PJ_SUCCESS)
	    bytes_read = -status;

    } while (status != PJ_EPENDING && status != PJ_ECANCELLED &&
	     status != PJ_STATUS_FROM_OS(PJ_BLOCKING_ERROR_VAL));
}

/*
 * Initiate overlapped connect() operation (well, it's non-blocking actually,
 * since there's no overlapped version of connect()).
 */
PJ_DEF(pj_status_t) pj_ioqueue_connect( pj_ioqueue_key_t *key,
					const pj_sockaddr_t *addr,
					int addrlen )
{
    pj_status_t status;
    
    /* check parameters. All must be specified! */
    PJ_ASSERT_RETURN(key && addr && addrlen, PJ_EINVAL);

    /* Check if key is closing. */
    if (IS_CLOSING(key))
	return PJ_ECANCELLED;

    /* Check if socket has not been marked for connecting */
    if (key->connecting != 0)
        return PJ_EPENDING;
    
    status = pj_sock_connect(key->fd, addr, addrlen);
    if (status == PJ_SUCCESS) {
	/* Connected! */
	return PJ_SUCCESS;
    } else {
	if (status == PJ_STATUS_FROM_OS(PJ_BLOCKING_CONNECT_ERROR_VAL)) {
	    /* Pending! */
	    pj_ioqueue_lock_key(key);
	    /* Check again. Handle may have been closed after the previous 
	     * check in multithreaded app. See #913
	     */
	    if (IS_CLOSING(key)) {
		pj_ioqueue_unlock_key(key);
		return PJ_ECANCELLED;
	    }
	    key->connecting = PJ_TRUE;
            ioqueue_add_to_set(key->ioqueue, key, WRITEABLE_EVENT);
            ioqueue_add_to_set(key->ioqueue, key, EXCEPTION_EVENT);
            pj_ioqueue_unlock_key(key);
	    return PJ_EPENDING;
	} else {
	    /* Error! */
	    return status;
	}
    }
}

static void ioqueue_on_accept_complete(pj_ioqueue_key_t *key, 
				       pj_ioqueue_op_key_t *op_key,
				       pj_sock_t new_sock, 
				       pj_status_t status)
{
    pj_activesock_t *asock = (pj_activesock_t*) pj_ioqueue_get_user_data(key);
    struct accept_op *accept_op = (struct accept_op*) op_key;

    PJ_UNUSED_ARG(new_sock);

    /* Ignore if we've been shutdown */
    if (asock->shutdown)
	return;

    do {
	if (status == asock->last_err && status != PJ_SUCCESS) {
	    asock->err_counter++;
	    if (asock->err_counter >= PJ_ACTIVESOCK_MAX_CONSECUTIVE_ACCEPT_ERROR) {
		PJ_LOG(3, ("", "Received %d consecutive errors: %d for the accept()"
			       " operation, stopping further ioqueue accepts.",
			       asock->err_counter, asock->last_err));
		
		if ((status == PJ_STATUS_FROM_OS(OSERR_EWOULDBLOCK)) && 
		    (asock->cb.on_accept_complete2)) 
		{
		    (*asock->cb.on_accept_complete2)(asock, 
						     accept_op->new_sock,
						     &accept_op->rem_addr,
						     accept_op->rem_addr_len,
						     PJ_ESOCKETSTOP);
		}
		return;
	    }
	} else {
	    asock->err_counter = 0;
	    asock->last_err = status;
	}

	if (status==PJ_SUCCESS && (asock->cb.on_accept_complete2 || 
				   asock->cb.on_accept_complete)) {
	    pj_bool_t ret;

	    /* Notify callback */
	    if (asock->cb.on_accept_complete2) {
		ret = (*asock->cb.on_accept_complete2)(asock, 
						       accept_op->new_sock,
						       &accept_op->rem_addr,
						       accept_op->rem_addr_len,
						       status);
	    } else {
		ret = (*asock->cb.on_accept_complete)(asock, 
						      accept_op->new_sock,
						      &accept_op->rem_addr,
						      accept_op->rem_addr_len);	    
	    }

	    /* If callback returns false, we have been destroyed! */
	    if (!ret)
		return;

#if defined(PJ_IPHONE_OS_HAS_MULTITASKING_SUPPORT) && \
    PJ_IPHONE_OS_HAS_MULTITASKING_SUPPORT!=0
	    activesock_create_iphone_os_stream(asock);
#endif
	} else if (status==PJ_SUCCESS) {
	    /* Application doesn't handle the new socket, we need to 
	     * close it to avoid resource leak.
	     */
	    pj_sock_close(accept_op->new_sock);
	}

	/* Don't start another accept() if we've been shutdown */
	if (asock->shutdown)
	    return;

	/* Prepare next accept() */
	accept_op->new_sock = PJ_INVALID_SOCKET;
	accept_op->rem_addr_len = sizeof(accept_op->rem_addr);

	status = pj_ioqueue_accept(asock->key, op_key, &accept_op->new_sock,
				   NULL, &accept_op->rem_addr, 
				   &accept_op->rem_addr_len);

    } while (status != PJ_EPENDING && status != PJ_ECANCELLED);
}

/*
 * pj_ioqueue_connect()
 *
 * Initiate overlapped connect() operation (well, it's non-blocking actually,
 * since there's no overlapped version of connect()).
 */
PJ_DEF(pj_status_t) pj_ioqueue_connect( pj_ioqueue_key_t *key,
					const pj_sockaddr_t *addr,
					int addrlen )
{
    HANDLE hEvent;
    pj_ioqueue_t *ioqueue;

    PJ_CHECK_STACK();
    PJ_ASSERT_RETURN(key && addr && addrlen, PJ_EINVAL);

#if PJ_IOQUEUE_HAS_SAFE_UNREG
    /* Check key is not closing */
    if (key->closing)
	return PJ_ECANCELLED;
#endif

    /* Initiate connect() */
    if (connect((pj_sock_t)key->hnd, addr, addrlen) != 0) {
	DWORD dwStatus;
	dwStatus = WSAGetLastError();
        if (dwStatus != WSAEWOULDBLOCK) {
	    return PJ_RETURN_OS_ERROR(dwStatus);
	}
    } else {
	/* Connect has completed immediately! */
	return PJ_SUCCESS;
    }

    ioqueue = key->ioqueue;

    /* Add to the array of connecting socket to be polled */
    pj_lock_acquire(ioqueue->lock);

    if (ioqueue->connecting_count >= MAXIMUM_WAIT_OBJECTS) {
	pj_lock_release(ioqueue->lock);
	return PJ_ETOOMANYCONN;
    }

    /* Get or create event object. */
    if (ioqueue->event_count) {
	hEvent = ioqueue->event_pool[ioqueue->event_count - 1];
	--ioqueue->event_count;
    } else {
	hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
	if (hEvent == NULL) {
	    DWORD dwStatus = GetLastError();
	    pj_lock_release(ioqueue->lock);
	    return PJ_STATUS_FROM_OS(dwStatus);
	}
    }

    /* Mark key as connecting.
     * We can't use array index since key can be removed dynamically. 
     */
    key->connecting = 1;

    /* Associate socket events to the event object. */
    if (WSAEventSelect((pj_sock_t)key->hnd, hEvent, FD_CONNECT) != 0) {
	CloseHandle(hEvent);
	pj_lock_release(ioqueue->lock);
	return PJ_RETURN_OS_ERROR(WSAGetLastError());
    }

    /* Add to array. */
    ioqueue->connecting_keys[ ioqueue->connecting_count ] = key;
    ioqueue->connecting_handles[ ioqueue->connecting_count ] = hEvent;
    ioqueue->connecting_count++;

    pj_lock_release(ioqueue->lock);

    return PJ_EPENDING;
}

//.........这里部分代码省略.........
	if (signalled_dir == PJMEDIA_DIR_PLAYBACK)
	{
	    struct wmme_stream *wmme_strm = &strm->play_strm;
	    MMRESULT mr = MMSYSERR_NOERROR;
	    status = PJ_SUCCESS;

	    /*
	    * Windows Multimedia has requested us to feed some frames to
	    * playback buffer.
	    */

	    while (wmme_strm->WaveHdr[wmme_strm->dwBufIdx].dwFlags & WHDR_DONE)
	    {
		void* buffer = wmme_strm->WaveHdr[wmme_strm->dwBufIdx].lpData;

		PJ_LOG(5,(THIS_FILE, "Finished writing buffer %d", 
			  wmme_strm->dwBufIdx));

		/* Get frame from application. */
		status = (*strm->play_cb)(strm->user_data, 
					  wmme_strm->timestamp.u32.lo,
					  buffer,
					  bytes_per_frame);

		if (status != PJ_SUCCESS)
		    break;

		/* Write to the device. */
		mr = waveOutWrite(wmme_strm->hWave.Out, 
				  &(wmme_strm->WaveHdr[wmme_strm->dwBufIdx]), 
				  sizeof(WAVEHDR));
		if (mr != MMSYSERR_NOERROR)
		{
		    status = PJ_STATUS_FROM_OS(mr);
		    break;
		}

		/* Increment position. */
		if (++wmme_strm->dwBufIdx >= wmme_strm->dwMaxBufIdx)
		    wmme_strm->dwBufIdx = 0;
		wmme_strm->timestamp.u64 += strm->samples_per_frame / 
					    strm->channel_count;
	    }
	}
	else
	{
	    struct wmme_stream *wmme_strm = &strm->rec_strm;
	    MMRESULT mr = MMSYSERR_NOERROR;
	    status = PJ_SUCCESS;

	    /*
	    * Windows Multimedia has indicated that it has some frames ready
	    * in the capture buffer. Get as much frames as possible to
	    * prevent overflows.
	    */
#if 0
	    {
		static DWORD tc = 0;
		DWORD now = GetTickCount();
		DWORD i = 0;
		DWORD bits = 0;

		if (tc == 0) tc = now;

		for (i = 0; i < wmme_strm->dwMaxBufIdx; ++i)
		{

/* Handler for sending outgoing message; called by transport manager. */
static pj_status_t loop_send_msg( pjsip_transport *tp, 
				  pjsip_tx_data *tdata,
				  const pj_sockaddr_t *rem_addr,
				  int addr_len,
				  void *token,
				  void (*cb)(pjsip_transport *transport,
					     void *token, 
					     pj_ssize_t sent_bytes))
{
    struct loop_transport *loop = (struct loop_transport*)tp;
    struct recv_list *recv_pkt;
    
    PJ_ASSERT_RETURN(tp && (tp->key.type == PJSIP_TRANSPORT_LOOP ||
	             tp->key.type == PJSIP_TRANSPORT_LOOP_DGRAM), PJ_EINVAL);

    PJ_UNUSED_ARG(rem_addr);
    PJ_UNUSED_ARG(addr_len);


    /* Need to send failure? */
    if (loop->fail_mode) {
	if (loop->send_delay == 0) {
	    return PJ_STATUS_FROM_OS(OSERR_ECONNRESET);
	} else {
	    add_notification(loop, tdata, -PJ_STATUS_FROM_OS(OSERR_ECONNRESET),
			     token, cb);

	    return PJ_EPENDING;
	}
    }

    /* Discard any packets? */
    if (loop->discard)
	return PJ_SUCCESS;

    /* Create rdata for the "incoming" packet. */
    recv_pkt = create_incoming_packet(loop, tdata);
    if (!recv_pkt)
	return PJ_ENOMEM;

    /* If delay is not configured, deliver this packet now! */
    if (loop->recv_delay == 0) {
	pj_ssize_t size_eaten;

	size_eaten = pjsip_tpmgr_receive_packet( loop->base.tpmgr, 
						 &recv_pkt->rdata);
	pj_assert(size_eaten == recv_pkt->rdata.pkt_info.len);

	pjsip_endpt_release_pool(loop->base.endpt, 
				 recv_pkt->rdata.tp_info.pool);

    } else {
	/* Otherwise if delay is configured, add the "packet" to the 
	 * receive list to be processed by worker thread.
	 */
	pj_lock_acquire(loop->base.lock);
	pj_list_push_back(&loop->recv_list, recv_pkt);
	pj_lock_release(loop->base.lock);
    }

    if (loop->send_delay != 0) {
	add_notification(loop, tdata, tdata->buf.cur - tdata->buf.start,
			 token, cb);
	return PJ_EPENDING;
    } else {
	return PJ_SUCCESS;
    }
}

//.........这里部分代码省略.........
            ioqueue_remove_from_set(ioqueue, h, READABLE_EVENT);

        bytes_read = read_op->size;

	if ((read_op->op == PJ_IOQUEUE_OP_RECV_FROM)) {
	    read_op->op = PJ_IOQUEUE_OP_NONE;
	    rc = pj_sock_recvfrom(h->fd, read_op->buf, &bytes_read, 
				  read_op->flags,
				  read_op->rmt_addr, 
                                  read_op->rmt_addrlen);
	} else if ((read_op->op == PJ_IOQUEUE_OP_RECV)) {
	    read_op->op = PJ_IOQUEUE_OP_NONE;
	    rc = pj_sock_recv(h->fd, read_op->buf, &bytes_read, 
			      read_op->flags);
        } else {
            pj_assert(read_op->op == PJ_IOQUEUE_OP_READ);
	    read_op->op = PJ_IOQUEUE_OP_NONE;
            /*
             * User has specified pj_ioqueue_read().
             * On Win32, we should do ReadFile(). But because we got
             * here because of select() anyway, user must have put a
             * socket descriptor on h->fd, which in this case we can
             * just call pj_sock_recv() instead of ReadFile().
             * On Unix, user may put a file in h->fd, so we'll have
             * to call read() here.
             * This may not compile on systems which doesn't have 
             * read(). That's why we only specify PJ_LINUX here so
             * that error is easier to catch.
             */
#	    if defined(PJ_WIN32) && PJ_WIN32 != 0 || \
	       defined(PJ_WIN32_WINCE) && PJ_WIN32_WINCE != 0
                rc = pj_sock_recv(h->fd, read_op->buf, &bytes_read, 
				  read_op->flags);
                //rc = ReadFile((HANDLE)h->fd, read_op->buf, read_op->size,
                //              &bytes_read, NULL);
#           elif (defined(PJ_HAS_UNISTD_H) && PJ_HAS_UNISTD_H != 0)
                bytes_read = read(h->fd, read_op->buf, bytes_read);
                rc = (bytes_read >= 0) ? PJ_SUCCESS : pj_get_os_error();
#	    elif defined(PJ_LINUX_KERNEL) && PJ_LINUX_KERNEL != 0
                bytes_read = sys_read(h->fd, read_op->buf, bytes_read);
                rc = (bytes_read >= 0) ? PJ_SUCCESS : -bytes_read;
#           else
#               error "Implement read() for this platform!"
#           endif
        }
	
	if (rc != PJ_SUCCESS) {
#	    if defined(PJ_WIN32) && PJ_WIN32 != 0
	    /* On Win32, for UDP, WSAECONNRESET on the receive side 
	     * indicates that previous sending has triggered ICMP Port 
	     * Unreachable message.
	     * But we wouldn't know at this point which one of previous 
	     * key that has triggered the error, since UDP socket can
	     * be shared!
	     * So we'll just ignore it!
	     */

	    if (rc == PJ_STATUS_FROM_OS(WSAECONNRESET)) {
		//PJ_LOG(4,(THIS_FILE, 
                //          "Ignored ICMP port unreach. on key=%p", h));
	    }
#	    endif

            /* In any case we would report this to caller. */
            bytes_read = -rc;
	}

	/* Unlock; from this point we don't need to hold key's mutex
	 * (unless concurrency is disabled, which in this case we should
	 * hold the mutex while calling the callback) */
	if (h->allow_concurrent) {
	    /* concurrency may be changed while we're in the callback, so
	     * save it to a flag.
	     */
	    has_lock = PJ_FALSE;
	    pj_mutex_unlock(h->mutex);
	} else {
	    has_lock = PJ_TRUE;
	}

	/* Call callback. */
        if (h->cb.on_read_complete && !IS_CLOSING(h)) {
	    (*h->cb.on_read_complete)(h, 
                                      (pj_ioqueue_op_key_t*)read_op,
                                      bytes_read);
        }

	if (has_lock) {
	    pj_mutex_unlock(h->mutex);
	}

    } else {
        /*
         * This is normal; execution may fall here when multiple threads
         * are signalled for the same event, but only one thread eventually
         * able to process the event.
         */
        pj_mutex_unlock(h->mutex);
    }
}

static void ioqueue_on_read_complete(pj_ioqueue_key_t *key, 
				     pj_ioqueue_op_key_t *op_key, 
				     pj_ssize_t bytes_read)
{
    pj_activesock_t *asock;
    struct read_op *r = (struct read_op*)op_key;
    unsigned loop = 0;
    pj_status_t status;

    asock = (pj_activesock_t*) pj_ioqueue_get_user_data(key);

    /* Ignore if we've been shutdown */
    if (asock->shutdown & SHUT_RX)
	return;

    do {
	unsigned flags;

	if (bytes_read > 0) {
	    /*
	     * We've got new data.
	     */
	    pj_size_t remainder;
	    pj_bool_t ret;

	    /* Append this new data to existing data. If socket is stream 
	     * oriented, user might have left some data in the buffer. 
	     * Otherwise if socket is datagram there will be nothing in 
	     * existing packet hence the packet will contain only the new
	     * packet.
	     */
	    r->size += bytes_read;

	    /* Set default remainder to zero */
	    remainder = 0;

	    /* And return value to TRUE */
	    ret = PJ_TRUE;

	    /* Notify callback */
	    if (asock->read_type == TYPE_RECV && asock->cb.on_data_read) {
		ret = (*asock->cb.on_data_read)(asock, r->pkt, r->size,
						PJ_SUCCESS, &remainder);
	    } else if (asock->read_type == TYPE_RECV_FROM && 
		       asock->cb.on_data_recvfrom) 
	    {
		ret = (*asock->cb.on_data_recvfrom)(asock, r->pkt, r->size,
						    &r->src_addr, 
						    r->src_addr_len,
						    PJ_SUCCESS);
	    }

	    /* If callback returns false, we have been destroyed! */
	    if (!ret)
		return;

	    /* Only stream oriented socket may leave data in the packet */
	    if (asock->stream_oriented) {
		r->size = remainder;
	    } else {
		r->size = 0;
	    }

	} else if (bytes_read <= 0 &&
		   -bytes_read != PJ_STATUS_FROM_OS(OSERR_EWOULDBLOCK) &&
		   -bytes_read != PJ_STATUS_FROM_OS(OSERR_EINPROGRESS) && 
		   (asock->stream_oriented ||
		    -bytes_read != PJ_STATUS_FROM_OS(OSERR_ECONNRESET))) 
	{
	    pj_size_t remainder;
	    pj_bool_t ret;

	    if (bytes_read == 0) {
		/* For stream/connection oriented socket, this means the 
		 * connection has been closed. For datagram sockets, it means
		 * we've received datagram with zero length.
		 */
		if (asock->stream_oriented)
		    status = PJ_EEOF;
		else
		    status = PJ_SUCCESS;
	    } else {
		/* This means we've got an error. If this is stream/connection
		 * oriented, it means connection has been closed. For datagram
		 * sockets, it means we've got some error (e.g. EWOULDBLOCK).
		 */
		status = (pj_status_t)-bytes_read;
	    }

	    /* Set default remainder to zero */
	    remainder = 0;

	    /* And return value to TRUE */
	    ret = PJ_TRUE;

	    /* Notify callback */
	    if (asock->read_type == TYPE_RECV && asock->cb.on_data_read) {
		/* For connection oriented socket, we still need to report 
		 * the remainder data (if any) to the user to let user do 
		 * processing with the remainder data before it closes the
//.........这里部分代码省略.........