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// Copyright 2018 Google LLC
//
// 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 linux
import (
"gvisor.googlesource.com/gvisor/pkg/abi/linux"
"gvisor.googlesource.com/gvisor/pkg/sentry/arch"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs/timerfd"
"gvisor.googlesource.com/gvisor/pkg/sentry/kernel"
"gvisor.googlesource.com/gvisor/pkg/sentry/kernel/kdefs"
ktime "gvisor.googlesource.com/gvisor/pkg/sentry/kernel/time"
"gvisor.googlesource.com/gvisor/pkg/syserror"
)
// TimerfdCreate implements Linux syscall timerfd_create(2).
func TimerfdCreate(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
clockID := args[0].Int()
flags := args[1].Int()
if flags&^(linux.TFD_CLOEXEC|linux.TFD_NONBLOCK) != 0 {
return 0, nil, syserror.EINVAL
}
var c ktime.Clock
switch clockID {
case linux.CLOCK_REALTIME:
c = t.Kernel().RealtimeClock()
case linux.CLOCK_MONOTONIC:
c = t.Kernel().MonotonicClock()
default:
return 0, nil, syserror.EINVAL
}
f := timerfd.NewFile(t, c)
defer f.DecRef()
f.SetFlags(fs.SettableFileFlags{
NonBlocking: flags&linux.TFD_NONBLOCK != 0,
})
fd, err := t.FDMap().NewFDFrom(0, f, kernel.FDFlags{
CloseOnExec: flags&linux.TFD_CLOEXEC != 0,
}, t.ThreadGroup().Limits())
if err != nil {
return 0, nil, err
}
return uintptr(fd), nil, nil
}
// TimerfdSettime implements Linux syscall timerfd_settime(2).
func TimerfdSettime(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
fd := kdefs.FD(args[0].Int())
flags := args[1].Int()
newValAddr := args[2].Pointer()
oldValAddr := args[3].Pointer()
if flags&^(linux.TFD_TIMER_ABSTIME) != 0 {
return 0, nil, syserror.EINVAL
}
f := t.FDMap().GetFile(fd)
if f == nil {
return 0, nil, syserror.EBADF
}
defer f.DecRef()
tf, ok := f.FileOperations.(*timerfd.TimerOperations)
if !ok {
return 0, nil, syserror.EINVAL
}
var newVal linux.Itimerspec
if _, err := t.CopyIn(newValAddr, &newVal); err != nil {
return 0, nil, err
}
newS, err := ktime.SettingFromItimerspec(newVal, flags&linux.TFD_TIMER_ABSTIME != 0, tf.Clock())
if err != nil {
return 0, nil, err
}
tm, oldS := tf.SetTime(newS)
if oldValAddr != 0 {
oldVal := ktime.ItimerspecFromSetting(tm, oldS)
if _, err := t.CopyOut(oldValAddr, &oldVal); err != nil {
return 0, nil, err
}
}
return 0, nil, nil
}
// TimerfdGettime implements Linux syscall timerfd_gettime(2).
func TimerfdGettime(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
fd := kdefs.FD(args[0].Int())
curValAddr := args[1].Pointer()
f := t.FDMap().GetFile(fd)
if f == nil {
return 0, nil, syserror.EBADF
}
defer f.DecRef()
tf, ok := f.FileOperations.(*timerfd.TimerOperations)
if !ok {
return 0, nil, syserror.EINVAL
}
tm, s := tf.GetTime()
curVal := ktime.ItimerspecFromSetting(tm, s)
_, err := t.CopyOut(curValAddr, &curVal)
return 0, nil, err
}
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