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/*
* Copyright (c) 2021 The Gnet Authors. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package gnet
import "github.com/panjf2000/gnet/v2/internal/netpoll"
func (c *conn) handleEvents(_ int, ev uint32) error {
// Don't change the ordering of processing EPOLLOUT | EPOLLRDHUP / EPOLLIN unless you're 100%
// sure what you're doing!
// Re-ordering can easily introduce bugs and bad side-effects, as I found out painfully in the past.
// We should always check for the EPOLLOUT event first, as we must try to send the leftover data back to
// the peer when any error occurs on a connection.
//
// Either an EPOLLOUT or EPOLLERR event may be fired when a connection is refused.
// In either case write() should take care of it properly:
// 1) writing data back,
// 2) closing the connection.
if ev&netpoll.OutEvents != 0 && !c.outboundBuffer.IsEmpty() {
if err := c.loop.write(c); err != nil {
return err
}
}
if ev&netpoll.InEvents != 0 {
return c.loop.read(c)
}
return nil
}
func (el *eventloop) readUDP(fd int, ev netpoll.IOEvent) error {
return el.readUDP1(fd, ev, 0)
}
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