79 lines
2.3 KiB
Go
79 lines
2.3 KiB
Go
// Copyright 2018 Google Inc.
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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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"syscall"
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"gvisor.googlesource.com/gvisor/pkg/sentry/arch"
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"gvisor.googlesource.com/gvisor/pkg/sentry/kernel"
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"gvisor.googlesource.com/gvisor/pkg/sentry/kernel/kdefs"
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"gvisor.googlesource.com/gvisor/pkg/sentry/kernel/pipe"
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"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
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)
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// pipe2 implements the actual system call with flags.
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func pipe2(t *kernel.Task, addr usermem.Addr, flags uint) (uintptr, error) {
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if flags&^(syscall.O_NONBLOCK|syscall.O_CLOEXEC) != 0 {
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return 0, syscall.EINVAL
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}
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r, w := pipe.NewConnectedPipe(t, pipe.DefaultPipeSize, usermem.PageSize)
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r.SetFlags(linuxToFlags(flags).Settable())
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defer r.DecRef()
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w.SetFlags(linuxToFlags(flags).Settable())
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defer w.DecRef()
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rfd, err := t.FDMap().NewFDFrom(0, r, kernel.FDFlags{
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CloseOnExec: flags&syscall.O_CLOEXEC != 0},
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t.ThreadGroup().Limits())
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if err != nil {
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return 0, err
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}
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wfd, err := t.FDMap().NewFDFrom(0, w, kernel.FDFlags{
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CloseOnExec: flags&syscall.O_CLOEXEC != 0},
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t.ThreadGroup().Limits())
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if err != nil {
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t.FDMap().Remove(rfd)
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return 0, err
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}
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if _, err := t.CopyOut(addr, []kdefs.FD{rfd, wfd}); err != nil {
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t.FDMap().Remove(rfd)
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t.FDMap().Remove(wfd)
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return 0, syscall.EFAULT
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}
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return 0, nil
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}
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// Pipe implements linux syscall pipe(2).
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func Pipe(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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addr := args[0].Pointer()
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n, err := pipe2(t, addr, 0)
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return n, nil, err
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}
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// Pipe2 implements linux syscall pipe2(2).
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func Pipe2(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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addr := args[0].Pointer()
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flags := uint(args[1].Uint())
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n, err := pipe2(t, addr, flags)
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return n, nil, err
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}
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