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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 sys
import (
"fmt"
"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"
"gvisor.googlesource.com/gvisor/pkg/syserror"
)
// +stateify savable
type cpunum struct {
ramfs.Entry
}
func (c *cpunum) DeprecatedPreadv(ctx context.Context, dst usermem.IOSequence, offset int64) (int64, error) {
if offset < 0 {
return 0, syserror.EINVAL
}
k := kernel.KernelFromContext(ctx)
if k == nil {
return 0, io.EOF
}
str := []byte(fmt.Sprintf("0-%d\n", k.ApplicationCores()-1))
if offset >= int64(len(str)) {
return 0, io.EOF
}
n, err := dst.CopyOut(ctx, str[offset:])
return int64(n), err
}
func newPossible(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
c := &cpunum{}
c.InitEntry(ctx, fs.RootOwner, fs.FilePermsFromMode(0444))
return newFile(c, msrc)
}
func newCPU(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
m := map[string]*fs.Inode{
"online": newPossible(ctx, msrc),
"possible": newPossible(ctx, msrc),
"present": newPossible(ctx, msrc),
}
// Add directories for each of the cpus.
if k := kernel.KernelFromContext(ctx); k != nil {
for i := 0; uint(i) < k.ApplicationCores(); i++ {
m[fmt.Sprintf("cpu%d", i)] = newDir(ctx, msrc, nil)
}
}
return newDir(ctx, msrc, m)
}
func newSystemDir(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
return newDir(ctx, msrc, map[string]*fs.Inode{
"cpu": newCPU(ctx, msrc),
})
}
func newDevicesDir(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
return newDir(ctx, msrc, map[string]*fs.Inode{
"system": newSystemDir(ctx, msrc),
})
}
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