148 lines
3.9 KiB
Go
148 lines
3.9 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/kernel"
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"gvisor.dev/gvisor/pkg/sentry/kernel/epoll"
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"gvisor.dev/gvisor/pkg/sentry/syscalls"
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"gvisor.dev/gvisor/pkg/syserror"
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"gvisor.dev/gvisor/pkg/waiter"
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)
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// LINT.IfChange
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// EpollCreate1 implements the epoll_create1(2) linux syscall.
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func EpollCreate1(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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flags := args[0].Int()
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if flags & ^linux.EPOLL_CLOEXEC != 0 {
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return 0, nil, syserror.EINVAL
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}
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closeOnExec := flags&linux.EPOLL_CLOEXEC != 0
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fd, err := syscalls.CreateEpoll(t, closeOnExec)
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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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// EpollCreate implements the epoll_create(2) linux syscall.
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func EpollCreate(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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size := args[0].Int()
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if size <= 0 {
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return 0, nil, syserror.EINVAL
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}
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fd, err := syscalls.CreateEpoll(t, false)
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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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// EpollCtl implements the epoll_ctl(2) linux syscall.
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func EpollCtl(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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epfd := args[0].Int()
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op := args[1].Int()
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fd := args[2].Int()
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eventAddr := args[3].Pointer()
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// Capture the event state if needed.
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flags := epoll.EntryFlags(0)
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mask := waiter.EventMask(0)
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var data [2]int32
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if op != linux.EPOLL_CTL_DEL {
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var e linux.EpollEvent
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if _, err := e.CopyIn(t, eventAddr); err != nil {
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return 0, nil, err
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}
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if e.Events&linux.EPOLLONESHOT != 0 {
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flags |= epoll.OneShot
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}
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if e.Events&linux.EPOLLET != 0 {
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flags |= epoll.EdgeTriggered
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}
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mask = waiter.EventMaskFromLinux(e.Events)
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data = e.Data
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}
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// Perform the requested operations.
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switch op {
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case linux.EPOLL_CTL_ADD:
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// See fs/eventpoll.c.
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mask |= waiter.EventHUp | waiter.EventErr
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return 0, nil, syscalls.AddEpoll(t, epfd, fd, flags, mask, data)
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case linux.EPOLL_CTL_DEL:
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return 0, nil, syscalls.RemoveEpoll(t, epfd, fd)
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case linux.EPOLL_CTL_MOD:
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// Same as EPOLL_CTL_ADD.
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mask |= waiter.EventHUp | waiter.EventErr
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return 0, nil, syscalls.UpdateEpoll(t, epfd, fd, flags, mask, data)
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default:
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return 0, nil, syserror.EINVAL
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}
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}
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// EpollWait implements the epoll_wait(2) linux syscall.
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func EpollWait(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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epfd := args[0].Int()
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eventsAddr := args[1].Pointer()
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maxEvents := int(args[2].Int())
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timeout := int(args[3].Int())
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r, err := syscalls.WaitEpoll(t, epfd, maxEvents, timeout)
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if err != nil {
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return 0, nil, syserror.ConvertIntr(err, syserror.EINTR)
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}
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if len(r) != 0 {
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if _, err := linux.CopyEpollEventSliceOut(t, eventsAddr, r); err != nil {
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return 0, nil, err
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}
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}
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return uintptr(len(r)), nil, nil
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}
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// EpollPwait implements the epoll_pwait(2) linux syscall.
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func EpollPwait(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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maskAddr := args[4].Pointer()
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maskSize := uint(args[5].Uint())
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if maskAddr != 0 {
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mask, err := CopyInSigSet(t, maskAddr, maskSize)
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if err != nil {
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return 0, nil, err
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}
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oldmask := t.SignalMask()
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t.SetSignalMask(mask)
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t.SetSavedSignalMask(oldmask)
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}
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return EpollWait(t, args)
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}
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// LINT.ThenChange(vfs2/epoll.go)
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