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// Copyright 2021 The gVisor Authors.
//
// 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 control
import (
"errors"
"fmt"
"gvisor.dev/gvisor/pkg/eventchannel"
"gvisor.dev/gvisor/pkg/urpc"
)
// EventsOpts are the arguments for eventchannel-related commands.
type EventsOpts struct {
urpc.FilePayload
}
// Events is the control server state for eventchannel-related commands.
type Events struct {
emitter eventchannel.Emitter
}
// AttachDebugEmitter receives a connected unix domain socket FD from the client
// and establishes it as a new emitter for the sentry eventchannel. Any existing
// emitters are replaced on a subsequent attach.
func (e *Events) AttachDebugEmitter(o *EventsOpts, _ *struct{}) error {
if len(o.FilePayload.Files) < 1 {
return errors.New("no output writer provided")
}
sock, err := o.ReleaseFD(0)
if err != nil {
return err
}
sockFD := sock.Release()
// SocketEmitter takes ownership of sockFD.
emitter, err := eventchannel.SocketEmitter(sockFD)
if err != nil {
return fmt.Errorf("failed to create SocketEmitter for FD %d: %v", sockFD, err)
}
// If there is already a debug emitter, close the old one.
if e.emitter != nil {
e.emitter.Close()
}
e.emitter = eventchannel.DebugEmitterFrom(emitter)
// Register the new stream destination.
eventchannel.AddEmitter(e.emitter)
return nil
}
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