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// Copyright 2020 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 vfs2
import (
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/fsimpl/pipefs"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/sentry/vfs"
"gvisor.dev/gvisor/pkg/syserror"
"gvisor.dev/gvisor/pkg/usermem"
)
// Pipe implements Linux syscall pipe(2).
func Pipe(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
addr := args[0].Pointer()
return 0, nil, pipe2(t, addr, 0)
}
// Pipe2 implements Linux syscall pipe2(2).
func Pipe2(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
addr := args[0].Pointer()
flags := args[1].Int()
return 0, nil, pipe2(t, addr, flags)
}
func pipe2(t *kernel.Task, addr usermem.Addr, flags int32) error {
if flags&^(linux.O_NONBLOCK|linux.O_CLOEXEC) != 0 {
return syserror.EINVAL
}
r, w := pipefs.NewConnectedPipeFDs(t, t.Kernel().PipeMount(), uint32(flags&linux.O_NONBLOCK))
defer r.DecRef(t)
defer w.DecRef(t)
fds, err := t.NewFDsVFS2(0, []*vfs.FileDescription{r, w}, kernel.FDFlags{
CloseOnExec: flags&linux.O_CLOEXEC != 0,
})
if err != nil {
return err
}
if _, err := t.CopyOut(addr, fds); err != nil {
for _, fd := range fds {
if _, file := t.FDTable().Remove(t, fd); file != nil {
file.DecRef(t)
}
}
return err
}
return nil
}
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