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