mirror of
https://github.com/netbirdio/gvisor.git
synced 2026-05-22 17:12:49 -07:00
Nicolas LacasseandgVisor bot
cceb04f05a
We used to track the foreground process group & session on the TTYFileOperation, but these are already tracked in kernel.TTY.ThreadGroup. So remove TTYFileOperations.fgProcessGroup and .session, and replace them with a kernel.TTY. This is analogous to how sentry-internal tty's already work. Updates #10925 PiperOrigin-RevId: 681957240
79 lines
2.4 KiB
Go
79 lines
2.4 KiB
Go
// Copyright 2018 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 devpts
|
|
|
|
import (
|
|
"gvisor.dev/gvisor/pkg/abi/linux"
|
|
"gvisor.dev/gvisor/pkg/context"
|
|
"gvisor.dev/gvisor/pkg/errors/linuxerr"
|
|
"gvisor.dev/gvisor/pkg/sentry/kernel"
|
|
"gvisor.dev/gvisor/pkg/sentry/vfs"
|
|
)
|
|
|
|
// Terminal is a pseudoterminal.
|
|
//
|
|
// Terminal implements kernel.TTYOperations.
|
|
//
|
|
// +stateify savable
|
|
type Terminal struct {
|
|
// n is the terminal index. It is immutable.
|
|
n uint32
|
|
|
|
// ld is the line discipline of the terminal. It is immutable.
|
|
ld *lineDiscipline
|
|
|
|
// root is the rootInode for this devpts mount. It is immutable.
|
|
root *rootInode
|
|
|
|
// masterKTTY contains the controlling process of the master end of
|
|
// this terminal. This field is immutable.
|
|
masterKTTY *kernel.TTY
|
|
|
|
// replicaKTTY contains the controlling process of the replica end of this
|
|
// terminal. This field is immutable.
|
|
replicaKTTY *kernel.TTY
|
|
}
|
|
|
|
var _ kernel.TTYOperations = (*Terminal)(nil)
|
|
|
|
// Open implements kernel.TTYOperations.Open.
|
|
func (t *Terminal) Open(ctx context.Context, mnt *vfs.Mount, vfsd *vfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
|
|
tsk := kernel.TaskFromContext(ctx)
|
|
if tsk == nil {
|
|
return nil, linuxerr.EIO
|
|
}
|
|
t.root.mu.Lock()
|
|
ri, ok := t.root.replicas[t.replicaKTTY.Index()]
|
|
t.root.mu.Unlock()
|
|
if !ok {
|
|
return nil, linuxerr.EIO
|
|
}
|
|
fd := &replicaFileDescription{
|
|
inode: ri,
|
|
}
|
|
fd.LockFD.Init(&ri.locks)
|
|
if err := fd.vfsfd.Init(fd, opts.Flags, mnt, vfsd, &vfs.FileDescriptionOptions{}); err != nil {
|
|
return nil, err
|
|
}
|
|
if opts.Flags&linux.O_NOCTTY == 0 {
|
|
// Opening a replica sets the process' controlling TTY when
|
|
// possible. An error indicates it cannot be set, and is
|
|
// ignored silently. See Linux tty_open().
|
|
_ = tsk.ThreadGroup().SetControllingTTY(ctx, t.replicaKTTY, false /* steal */, fd.vfsfd.IsReadable())
|
|
}
|
|
ri.t.ld.replicaOpen()
|
|
return &fd.vfsfd, nil
|
|
}
|