87 lines
2.3 KiB
Go
87 lines
2.3 KiB
Go
// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package sys
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import (
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"fmt"
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"io"
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"gvisor.googlesource.com/gvisor/pkg/sentry/context"
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"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
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"gvisor.googlesource.com/gvisor/pkg/sentry/fs/ramfs"
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"gvisor.googlesource.com/gvisor/pkg/sentry/kernel"
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"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
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"gvisor.googlesource.com/gvisor/pkg/syserror"
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)
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// +stateify savable
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type cpunum struct {
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ramfs.Entry
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}
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func (c *cpunum) DeprecatedPreadv(ctx context.Context, dst usermem.IOSequence, offset int64) (int64, error) {
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if offset < 0 {
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return 0, syserror.EINVAL
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}
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k := kernel.KernelFromContext(ctx)
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if k == nil {
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return 0, io.EOF
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}
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str := []byte(fmt.Sprintf("0-%d\n", k.ApplicationCores()-1))
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if offset >= int64(len(str)) {
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return 0, io.EOF
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}
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n, err := dst.CopyOut(ctx, str[offset:])
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return int64(n), err
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}
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func newPossible(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
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c := &cpunum{}
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c.InitEntry(ctx, fs.RootOwner, fs.FilePermsFromMode(0444))
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return newFile(c, msrc)
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}
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func newCPU(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
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m := map[string]*fs.Inode{
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"online": newPossible(ctx, msrc),
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"possible": newPossible(ctx, msrc),
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"present": newPossible(ctx, msrc),
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}
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// Add directories for each of the cpus.
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if k := kernel.KernelFromContext(ctx); k != nil {
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for i := 0; uint(i) < k.ApplicationCores(); i++ {
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m[fmt.Sprintf("cpu%d", i)] = newDir(ctx, msrc, nil)
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}
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}
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return newDir(ctx, msrc, m)
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}
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func newSystemDir(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
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return newDir(ctx, msrc, map[string]*fs.Inode{
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"cpu": newCPU(ctx, msrc),
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})
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}
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func newDevicesDir(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
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return newDir(ctx, msrc, map[string]*fs.Inode{
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"system": newSystemDir(ctx, msrc),
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})
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}
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