121 lines
3.7 KiB
Go
121 lines
3.7 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package devpts
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import (
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/context"
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"gvisor.dev/gvisor/pkg/sentry/arch"
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"gvisor.dev/gvisor/pkg/sentry/kernel"
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"gvisor.dev/gvisor/pkg/usermem"
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)
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// Terminal is a pseudoterminal.
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//
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// +stateify savable
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type Terminal struct {
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// n is the terminal index. It is immutable.
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n uint32
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// ld is the line discipline of the terminal. It is immutable.
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ld *lineDiscipline
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// masterKTTY contains the controlling process of the master end of
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// this terminal. This field is immutable.
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masterKTTY *kernel.TTY
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// slaveKTTY contains the controlling process of the slave end of this
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// terminal. This field is immutable.
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slaveKTTY *kernel.TTY
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}
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func newTerminal(n uint32) *Terminal {
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termios := linux.DefaultSlaveTermios
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t := Terminal{
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n: n,
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ld: newLineDiscipline(termios),
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masterKTTY: &kernel.TTY{Index: n},
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slaveKTTY: &kernel.TTY{Index: n},
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}
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return &t
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}
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// setControllingTTY makes tm the controlling terminal of the calling thread
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// group.
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func (tm *Terminal) setControllingTTY(ctx context.Context, io usermem.IO, args arch.SyscallArguments, isMaster bool) error {
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task := kernel.TaskFromContext(ctx)
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if task == nil {
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panic("setControllingTTY must be called from a task context")
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}
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return task.ThreadGroup().SetControllingTTY(tm.tty(isMaster), args[2].Int())
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}
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// releaseControllingTTY removes tm as the controlling terminal of the calling
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// thread group.
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func (tm *Terminal) releaseControllingTTY(ctx context.Context, io usermem.IO, args arch.SyscallArguments, isMaster bool) error {
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task := kernel.TaskFromContext(ctx)
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if task == nil {
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panic("releaseControllingTTY must be called from a task context")
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}
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return task.ThreadGroup().ReleaseControllingTTY(tm.tty(isMaster))
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}
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// foregroundProcessGroup gets the process group ID of tm's foreground process.
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func (tm *Terminal) foregroundProcessGroup(ctx context.Context, io usermem.IO, args arch.SyscallArguments, isMaster bool) (uintptr, error) {
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task := kernel.TaskFromContext(ctx)
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if task == nil {
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panic("foregroundProcessGroup must be called from a task context")
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}
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ret, err := task.ThreadGroup().ForegroundProcessGroup(tm.tty(isMaster))
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if err != nil {
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return 0, err
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}
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// Write it out to *arg.
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_, err = usermem.CopyObjectOut(ctx, io, args[2].Pointer(), int32(ret), usermem.IOOpts{
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AddressSpaceActive: true,
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})
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return 0, err
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}
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// foregroundProcessGroup sets tm's foreground process.
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func (tm *Terminal) setForegroundProcessGroup(ctx context.Context, io usermem.IO, args arch.SyscallArguments, isMaster bool) (uintptr, error) {
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task := kernel.TaskFromContext(ctx)
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if task == nil {
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panic("setForegroundProcessGroup must be called from a task context")
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}
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// Read in the process group ID.
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var pgid int32
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if _, err := usermem.CopyObjectIn(ctx, io, args[2].Pointer(), &pgid, usermem.IOOpts{
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AddressSpaceActive: true,
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}); err != nil {
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return 0, err
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}
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ret, err := task.ThreadGroup().SetForegroundProcessGroup(tm.tty(isMaster), kernel.ProcessGroupID(pgid))
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return uintptr(ret), err
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}
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func (tm *Terminal) tty(isMaster bool) *kernel.TTY {
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if isMaster {
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return tm.masterKTTY
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}
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return tm.slaveKTTY
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}
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