github.com/metacubex/gvisor@v0.0.0-20240320004321-933faba989ec/pkg/sentry/unimpl/events.go (about)

     1  // Copyright 2018 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // Package unimpl contains interface to emit events about unimplemented
    16  // features.
    17  package unimpl
    18  
    19  import (
    20  	"github.com/metacubex/gvisor/pkg/context"
    21  	"github.com/metacubex/gvisor/pkg/log"
    22  )
    23  
    24  // contextID is the events package's type for context.Context.Value keys.
    25  type contextID int
    26  
    27  const (
    28  	// CtxEvents is a Context.Value key for a Events.
    29  	CtxEvents contextID = iota
    30  )
    31  
    32  // Events interface defines method to emit unsupported events.
    33  type Events interface {
    34  	EmitUnimplementedEvent(ctx context.Context, sysno uintptr)
    35  }
    36  
    37  // EmitUnimplementedEvent emits unsupported syscall event to the context.
    38  func EmitUnimplementedEvent(ctx context.Context, sysno uintptr) {
    39  	e := ctx.Value(CtxEvents)
    40  	if e == nil {
    41  		log.Warningf("Context.Value(CtxEvents) not present, unimplemented syscall event not reported.")
    42  		return
    43  	}
    44  	e.(Events).EmitUnimplementedEvent(ctx, sysno)
    45  }