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// 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.
//
// +stateify savable
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)
}
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