65 lines
1.9 KiB
Go
65 lines
1.9 KiB
Go
// Copyright 2018 Google Inc.
|
|
//
|
|
// 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 proc
|
|
|
|
import (
|
|
"io"
|
|
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/context"
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/fs/ramfs"
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/kernel"
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
|
|
)
|
|
|
|
// cpuinfo is a file describing the CPU capabilities.
|
|
//
|
|
// Presently cpuinfo never changes, so it doesn't need to be a SeqFile.
|
|
type cpuinfo struct {
|
|
ramfs.Entry
|
|
|
|
// k is the system kernel.
|
|
k *kernel.Kernel
|
|
}
|
|
|
|
// DeprecatedPreadv implements fs.InodeOperations.DeprecatedPreadv.
|
|
func (c *cpuinfo) DeprecatedPreadv(ctx context.Context, dst usermem.IOSequence, offset int64) (int64, error) {
|
|
features := c.k.FeatureSet()
|
|
if features == nil {
|
|
// Kernel is always initialized with a FeatureSet.
|
|
panic("cpuinfo read with nil FeatureSet")
|
|
}
|
|
|
|
contents := make([]byte, 0, 1024)
|
|
for i, max := uint(0), c.k.ApplicationCores(); i < max; i++ {
|
|
contents = append(contents, []byte(features.CPUInfo(i))...)
|
|
}
|
|
if offset >= int64(len(contents)) {
|
|
return 0, io.EOF
|
|
}
|
|
|
|
n, err := dst.CopyOut(ctx, contents[offset:])
|
|
return int64(n), err
|
|
}
|
|
|
|
func (p *proc) newCPUInfo(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
|
|
f := &cpuinfo{
|
|
k: p.k,
|
|
}
|
|
f.InitEntry(ctx, fs.RootOwner, fs.FilePermsFromMode(0444))
|
|
|
|
return newFile(f, msrc, fs.SpecialFile, nil)
|
|
}
|