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// Copyright 2021 The gVisor Authors.
//
// 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 cgroupfs
import (
"bytes"
"fmt"
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
"gvisor.dev/gvisor/pkg/usermem"
)
// +stateify savable
type jobController struct {
controllerCommon
id int64
}
var _ controller = (*jobController)(nil)
func newJobController(fs *filesystem) *jobController {
c := &jobController{}
c.controllerCommon.init(controllerJob, fs)
return c
}
func (c *jobController) AddControlFiles(ctx context.Context, creds *auth.Credentials, _ *cgroupInode, contents map[string]kernfs.Inode) {
contents["job.id"] = c.fs.newControllerWritableFile(ctx, creds, &jobIDData{c: c})
}
// +stateify savable
type jobIDData struct {
c *jobController
}
// Generate implements vfs.DynamicBytesSource.Generate.
func (d *jobIDData) Generate(ctx context.Context, buf *bytes.Buffer) error {
fmt.Fprintf(buf, "%d\n", d.c.id)
return nil
}
// Write implements vfs.WritableDynamicBytesSource.Write.
func (d *jobIDData) Write(ctx context.Context, src usermem.IOSequence, offset int64) (int64, error) {
val, n, err := parseInt64FromString(ctx, src, offset)
if err != nil {
return n, err
}
d.c.id = val
return n, nil
}
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