github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/pkg/sentry/fs/proc/cpuinfo.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 proc
    16  
    17  import (
    18  	"bytes"
    19  
    20  	"github.com/SagerNet/gvisor/pkg/context"
    21  	"github.com/SagerNet/gvisor/pkg/sentry/fs"
    22  	"github.com/SagerNet/gvisor/pkg/sentry/kernel"
    23  )
    24  
    25  // LINT.IfChange
    26  
    27  func newCPUInfo(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
    28  	k := kernel.KernelFromContext(ctx)
    29  	features := k.FeatureSet()
    30  	if features == nil {
    31  		// Kernel is always initialized with a FeatureSet.
    32  		panic("cpuinfo read with nil FeatureSet")
    33  	}
    34  	var buf bytes.Buffer
    35  	for i, max := uint(0), k.ApplicationCores(); i < max; i++ {
    36  		features.WriteCPUInfoTo(i, &buf)
    37  	}
    38  	return newStaticProcInode(ctx, msrc, buf.Bytes())
    39  }
    40  
    41  // LINT.ThenChange(../../fsimpl/proc/tasks_files.go)