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// Copyright 2018 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 linux
import (
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/fs"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/sentry/kernel/pipe"
"gvisor.dev/gvisor/pkg/sentry/usermem"
"gvisor.dev/gvisor/pkg/syserror"
)
// pipe2 implements the actual system call with flags.
func pipe2(t *kernel.Task, addr usermem.Addr, flags uint) (uintptr, error) {
if flags&^(linux.O_NONBLOCK|linux.O_CLOEXEC) != 0 {
return 0, syserror.EINVAL
}
r, w := pipe.NewConnectedPipe(t, pipe.DefaultPipeSize, usermem.PageSize)
r.SetFlags(linuxToFlags(flags).Settable())
defer r.DecRef()
w.SetFlags(linuxToFlags(flags).Settable())
defer w.DecRef()
fds, err := t.NewFDs(0, []*fs.File{r, w}, kernel.FDFlags{
CloseOnExec: flags&linux.O_CLOEXEC != 0,
})
if err != nil {
return 0, err
}
if _, err := t.CopyOut(addr, fds); err != nil {
// The files are not closed in this case, the exact semantics
// of this error case are not well defined, but they could have
// already been observed by user space.
return 0, syserror.EFAULT
}
return 0, nil
}
// Pipe implements linux syscall pipe(2).
func Pipe(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
addr := args[0].Pointer()
n, err := pipe2(t, addr, 0)
return n, nil, err
}
// Pipe2 implements linux syscall pipe2(2).
func Pipe2(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
addr := args[0].Pointer()
flags := uint(args[1].Uint())
n, err := pipe2(t, addr, flags)
return n, nil, err
}
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