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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 tty
import (
"gvisor.googlesource.com/gvisor/pkg/abi/linux"
"gvisor.googlesource.com/gvisor/pkg/sentry/arch"
"gvisor.googlesource.com/gvisor/pkg/sentry/context"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs/fsutil"
"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
"gvisor.googlesource.com/gvisor/pkg/syserror"
"gvisor.googlesource.com/gvisor/pkg/waiter"
)
// slaveInodeOperations are the fs.InodeOperations for the slave end of the
// Terminal (pts file).
type slaveInodeOperations struct {
inodeOperations
// d is the containing dir.
d *dirInodeOperations
// t is the connected Terminal.
t *Terminal
}
var _ fs.InodeOperations = (*slaveInodeOperations)(nil)
// newSlaveInode creates an fs.Inode for the slave end of a terminal.
//
// newSlaveInode takes ownership of t.
func newSlaveInode(ctx context.Context, d *dirInodeOperations, t *Terminal, owner fs.FileOwner, p fs.FilePermissions) *fs.Inode {
iops := &slaveInodeOperations{
inodeOperations: inodeOperations{
uattr: fs.WithCurrentTime(ctx, fs.UnstableAttr{
Owner: owner,
Perms: p,
Links: 1,
// Size and Blocks are always 0.
}),
},
d: d,
t: t,
}
return fs.NewInode(iops, d.msrc, fs.StableAttr{
DeviceID: ptsDevice.DeviceID(),
// N.B. Linux always uses inode id = tty index + 3. See
// fs/devpts/inode.c:devpts_pty_new.
//
// TODO: Since ptsDevice must be shared between
// different mounts, we must not assign fixed numbers.
InodeID: ptsDevice.NextIno(),
Type: fs.CharacterDevice,
// See fs/devpts/inode.c:devpts_fill_super.
BlockSize: 1024,
DeviceFileMajor: linux.UNIX98_PTY_SLAVE_MAJOR,
DeviceFileMinor: t.n,
})
}
// Release implements fs.InodeOperations.Release.
func (si *slaveInodeOperations) Release(ctx context.Context) {
si.t.DecRef()
}
// GetFile implements fs.InodeOperations.GetFile.
//
// This may race with destruction of the terminal. If the terminal is gone, it
// returns ENOENT.
func (si *slaveInodeOperations) GetFile(ctx context.Context, d *fs.Dirent, flags fs.FileFlags) (*fs.File, error) {
return fs.NewFile(ctx, d, flags, &slaveFileOperations{si: si}), nil
}
// slaveFileOperations are the fs.FileOperations for the slave end of a terminal.
type slaveFileOperations struct {
fsutil.PipeSeek `state:"nosave"`
fsutil.NotDirReaddir `state:"nosave"`
fsutil.NoFsync `state:"nosave"`
fsutil.NoopFlush `state:"nosave"`
fsutil.NoMMap `state:"nosave"`
// si is the inode operations.
si *slaveInodeOperations
}
var _ fs.FileOperations = (*slaveFileOperations)(nil)
// Release implements fs.FileOperations.Release.
func (sf *slaveFileOperations) Release() {
}
// EventRegister implements waiter.Waitable.EventRegister.
func (sf *slaveFileOperations) EventRegister(e *waiter.Entry, mask waiter.EventMask) {
sf.si.t.ld.outQueue.EventRegister(e, mask)
sf.si.t.ld.inQueue.EventRegister(e, mask)
}
// EventUnregister implements waiter.Waitable.EventUnregister.
func (sf *slaveFileOperations) EventUnregister(e *waiter.Entry) {
sf.si.t.ld.outQueue.EventUnregister(e)
sf.si.t.ld.inQueue.EventUnregister(e)
}
// Readiness implements waiter.Waitable.Readiness.
func (sf *slaveFileOperations) Readiness(mask waiter.EventMask) waiter.EventMask {
return sf.si.t.ld.slaveReadiness()
}
// Read implements fs.FileOperations.Read.
func (sf *slaveFileOperations) Read(ctx context.Context, _ *fs.File, dst usermem.IOSequence, _ int64) (int64, error) {
return sf.si.t.ld.inputQueueRead(ctx, dst)
}
// Write implements fs.FileOperations.Write.
func (sf *slaveFileOperations) Write(ctx context.Context, _ *fs.File, src usermem.IOSequence, _ int64) (int64, error) {
return sf.si.t.ld.outputQueueWrite(ctx, src)
}
// Ioctl implements fs.FileOperations.Ioctl.
func (sf *slaveFileOperations) Ioctl(ctx context.Context, io usermem.IO, args arch.SyscallArguments) (uintptr, error) {
switch args[1].Uint() {
case linux.TCGETS:
return sf.si.t.ld.getTermios(ctx, io, args)
case linux.TCSETS:
return sf.si.t.ld.setTermios(ctx, io, args)
case linux.TCSETSW:
// TODO: This should drain the output queue first.
return sf.si.t.ld.setTermios(ctx, io, args)
case linux.TIOCGPTN:
_, err := usermem.CopyObjectOut(ctx, io, args[2].Pointer(), uint32(sf.si.t.n), usermem.IOOpts{
AddressSpaceActive: true,
})
return 0, err
default:
return 0, syserror.ENOTTY
}
}
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