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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 (
"gvisor.googlesource.com/gvisor/pkg/sentry/context"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs/proc/device"
"gvisor.googlesource.com/gvisor/pkg/sentry/kernel"
"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
)
// +stateify savable
type file struct {
fs.InodeOperations
// nodeType is the file type of this file.
nodeType fs.InodeType
// t is the associated kernel task that owns this file.
t *kernel.Task
}
func newFile(node fs.InodeOperations, msrc *fs.MountSource, nodeType fs.InodeType, t *kernel.Task) *fs.Inode {
iops := &file{node, nodeType, t}
sattr := fs.StableAttr{
DeviceID: device.ProcDevice.DeviceID(),
InodeID: device.ProcDevice.NextIno(),
BlockSize: usermem.PageSize,
Type: nodeType,
}
return fs.NewInode(iops, msrc, sattr)
}
// UnstableAttr returns all attributes of this file.
func (f *file) UnstableAttr(ctx context.Context, inode *fs.Inode) (fs.UnstableAttr, error) {
uattr, err := f.InodeOperations.UnstableAttr(ctx, inode)
if err != nil {
return fs.UnstableAttr{}, err
}
if f.t != nil {
creds := f.t.Credentials()
uattr.Owner = fs.FileOwner{creds.EffectiveKUID, creds.EffectiveKGID}
}
return uattr, nil
}
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