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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 devpts
import (
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/usermem"
)
// Terminal is a pseudoterminal.
//
// +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
// masterKTTY contains the controlling process of the master end of
// this terminal. This field is immutable.
masterKTTY *kernel.TTY
// slaveKTTY contains the controlling process of the slave end of this
// terminal. This field is immutable.
slaveKTTY *kernel.TTY
}
func newTerminal(n uint32) *Terminal {
termios := linux.DefaultSlaveTermios
t := Terminal{
n: n,
ld: newLineDiscipline(termios),
masterKTTY: &kernel.TTY{Index: n},
slaveKTTY: &kernel.TTY{Index: n},
}
return &t
}
// setControllingTTY makes tm the controlling terminal of the calling thread
// group.
func (tm *Terminal) setControllingTTY(ctx context.Context, io usermem.IO, args arch.SyscallArguments, isMaster bool) error {
task := kernel.TaskFromContext(ctx)
if task == nil {
panic("setControllingTTY must be called from a task context")
}
return task.ThreadGroup().SetControllingTTY(tm.tty(isMaster), args[2].Int())
}
// releaseControllingTTY removes tm as the controlling terminal of the calling
// thread group.
func (tm *Terminal) releaseControllingTTY(ctx context.Context, io usermem.IO, args arch.SyscallArguments, isMaster bool) error {
task := kernel.TaskFromContext(ctx)
if task == nil {
panic("releaseControllingTTY must be called from a task context")
}
return task.ThreadGroup().ReleaseControllingTTY(tm.tty(isMaster))
}
// foregroundProcessGroup gets the process group ID of tm's foreground process.
func (tm *Terminal) foregroundProcessGroup(ctx context.Context, io usermem.IO, args arch.SyscallArguments, isMaster bool) (uintptr, error) {
task := kernel.TaskFromContext(ctx)
if task == nil {
panic("foregroundProcessGroup must be called from a task context")
}
ret, err := task.ThreadGroup().ForegroundProcessGroup(tm.tty(isMaster))
if err != nil {
return 0, err
}
// Write it out to *arg.
_, err = usermem.CopyObjectOut(ctx, io, args[2].Pointer(), int32(ret), usermem.IOOpts{
AddressSpaceActive: true,
})
return 0, err
}
// foregroundProcessGroup sets tm's foreground process.
func (tm *Terminal) setForegroundProcessGroup(ctx context.Context, io usermem.IO, args arch.SyscallArguments, isMaster bool) (uintptr, error) {
task := kernel.TaskFromContext(ctx)
if task == nil {
panic("setForegroundProcessGroup must be called from a task context")
}
// Read in the process group ID.
var pgid int32
if _, err := usermem.CopyObjectIn(ctx, io, args[2].Pointer(), &pgid, usermem.IOOpts{
AddressSpaceActive: true,
}); err != nil {
return 0, err
}
ret, err := task.ThreadGroup().SetForegroundProcessGroup(tm.tty(isMaster), kernel.ProcessGroupID(pgid))
return uintptr(ret), err
}
func (tm *Terminal) tty(isMaster bool) *kernel.TTY {
if isMaster {
return tm.masterKTTY
}
return tm.slaveKTTY
}
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