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// 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 tty
import (
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/marshal/primitive"
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/fs"
"gvisor.dev/gvisor/pkg/sentry/fs/fsutil"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/syserror"
"gvisor.dev/gvisor/pkg/usermem"
"gvisor.dev/gvisor/pkg/waiter"
)
// LINT.IfChange
// replicaInodeOperations are the fs.InodeOperations for the replica end of the
// Terminal (pts file).
//
// +stateify savable
type replicaInodeOperations struct {
fsutil.SimpleFileInode
// d is the containing dir.
d *dirInodeOperations
// t is the connected Terminal.
t *Terminal
}
var _ fs.InodeOperations = (*replicaInodeOperations)(nil)
// newReplicaInode creates an fs.Inode for the replica end of a terminal.
//
// newReplicaInode takes ownership of t.
func newReplicaInode(ctx context.Context, d *dirInodeOperations, t *Terminal, owner fs.FileOwner, p fs.FilePermissions) *fs.Inode {
iops := &replicaInodeOperations{
SimpleFileInode: *fsutil.NewSimpleFileInode(ctx, owner, p, linux.DEVPTS_SUPER_MAGIC),
d: d,
t: t,
}
return fs.NewInode(ctx, 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(b/75267214): 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_REPLICA_MAJOR,
DeviceFileMinor: t.n,
})
}
// Release implements fs.InodeOperations.Release.
func (si *replicaInodeOperations) Release(ctx context.Context) {
si.t.DecRef(ctx)
}
// Truncate implements fs.InodeOperations.Truncate.
func (*replicaInodeOperations) Truncate(context.Context, *fs.Inode, int64) error {
return nil
}
// GetFile implements fs.InodeOperations.GetFile.
//
// This may race with destruction of the terminal. If the terminal is gone, it
// returns ENOENT.
func (si *replicaInodeOperations) GetFile(ctx context.Context, d *fs.Dirent, flags fs.FileFlags) (*fs.File, error) {
return fs.NewFile(ctx, d, flags, &replicaFileOperations{si: si}), nil
}
// replicaFileOperations are the fs.FileOperations for the replica end of a
// terminal.
//
// +stateify savable
type replicaFileOperations struct {
fsutil.FilePipeSeek `state:"nosave"`
fsutil.FileNotDirReaddir `state:"nosave"`
fsutil.FileNoFsync `state:"nosave"`
fsutil.FileNoMMap `state:"nosave"`
fsutil.FileNoSplice `state:"nosave"`
fsutil.FileNoopFlush `state:"nosave"`
fsutil.FileUseInodeUnstableAttr `state:"nosave"`
// si is the inode operations.
si *replicaInodeOperations
}
var _ fs.FileOperations = (*replicaFileOperations)(nil)
// Release implements fs.FileOperations.Release.
func (sf *replicaFileOperations) Release(context.Context) {
}
// EventRegister implements waiter.Waitable.EventRegister.
func (sf *replicaFileOperations) EventRegister(e *waiter.Entry, mask waiter.EventMask) {
sf.si.t.ld.replicaWaiter.EventRegister(e, mask)
}
// EventUnregister implements waiter.Waitable.EventUnregister.
func (sf *replicaFileOperations) EventUnregister(e *waiter.Entry) {
sf.si.t.ld.replicaWaiter.EventUnregister(e)
}
// Readiness implements waiter.Waitable.Readiness.
func (sf *replicaFileOperations) Readiness(mask waiter.EventMask) waiter.EventMask {
return sf.si.t.ld.replicaReadiness()
}
// Read implements fs.FileOperations.Read.
func (sf *replicaFileOperations) 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 *replicaFileOperations) 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 *replicaFileOperations) Ioctl(ctx context.Context, file *fs.File, io usermem.IO, args arch.SyscallArguments) (uintptr, error) {
t := kernel.TaskFromContext(ctx)
if t == nil {
// ioctl(2) may only be called from a task goroutine.
return 0, syserror.ENOTTY
}
switch cmd := args[1].Uint(); cmd {
case linux.FIONREAD: // linux.FIONREAD == linux.TIOCINQ
// Get the number of bytes in the input queue read buffer.
return 0, sf.si.t.ld.inputQueueReadSize(t, args)
case linux.TCGETS:
return sf.si.t.ld.getTermios(t, args)
case linux.TCSETS:
return sf.si.t.ld.setTermios(t, args)
case linux.TCSETSW:
// TODO(b/29356795): This should drain the output queue first.
return sf.si.t.ld.setTermios(t, args)
case linux.TIOCGPTN:
nP := primitive.Uint32(sf.si.t.n)
_, err := nP.CopyOut(t, args[2].Pointer())
return 0, err
case linux.TIOCGWINSZ:
return 0, sf.si.t.ld.windowSize(t, args)
case linux.TIOCSWINSZ:
return 0, sf.si.t.ld.setWindowSize(t, args)
case linux.TIOCSCTTY:
// Make the given terminal the controlling terminal of the
// calling process.
return 0, sf.si.t.setControllingTTY(ctx, args, false /* isMaster */, file.Flags().Read)
case linux.TIOCNOTTY:
// Release this process's controlling terminal.
return 0, sf.si.t.releaseControllingTTY(ctx, args, false /* isMaster */)
case linux.TIOCGPGRP:
// Get the foreground process group.
return sf.si.t.foregroundProcessGroup(ctx, args, false /* isMaster */)
case linux.TIOCSPGRP:
// Set the foreground process group.
return sf.si.t.setForegroundProcessGroup(ctx, args, false /* isMaster */)
default:
maybeEmitUnimplementedEvent(ctx, cmd)
return 0, syserror.ENOTTY
}
}
// LINT.ThenChange(../../fsimpl/devpts/replica.go)
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