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// Copyright 2021 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/kernel"
"gvisor.dev/gvisor/pkg/sentry/kernel/mq"
)
// MqOpen implements mq_open(2).
func MqOpen(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
nameAddr := args[0].Pointer()
flag := args[1].Int()
mode := args[2].ModeT()
attrAddr := args[3].Pointer()
name, err := t.CopyInString(nameAddr, mq.MaxName)
if err != nil {
return 0, nil, err
}
rOnly := flag&linux.O_RDONLY == linux.O_RDONLY
wOnly := flag&linux.O_WRONLY == linux.O_WRONLY
readWrite := flag&linux.O_RDWR == linux.O_RDWR
create := flag&linux.O_CREAT == linux.O_CREAT
exclusive := flag&linux.O_EXCL == linux.O_EXCL
block := flag&linux.O_NONBLOCK != linux.O_NONBLOCK
var attr linux.MqAttr
var attrPtr *linux.MqAttr
if attrAddr != 0 {
if _, err := attr.CopyIn(t, attrAddr); err != nil {
return 0, nil, err
}
attrPtr = &attr
}
opts := openOpts(name, rOnly, wOnly, readWrite, create, exclusive, block)
r := t.IPCNamespace().PosixQueues()
queue, err := r.FindOrCreate(t, opts, linux.FileMode(mode), attrPtr)
if err != nil {
return 0, nil, err
}
defer queue.DecRef(t)
fd, err := t.NewFDFrom(0, queue, kernel.FDFlags{
CloseOnExec: flag&linux.O_CLOEXEC != 0,
})
if err != nil {
return 0, nil, err
}
return uintptr(fd), nil, nil
}
// MqUnlink implements mq_unlink(2).
func MqUnlink(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
nameAddr := args[0].Pointer()
name, err := t.CopyInString(nameAddr, mq.MaxName)
if err != nil {
return 0, nil, err
}
return 0, nil, t.IPCNamespace().PosixQueues().Remove(t, name)
}
func openOpts(name string, rOnly, wOnly, readWrite, create, exclusive, block bool) mq.OpenOpts {
var access mq.AccessType
switch {
case readWrite:
access = mq.ReadWrite
case wOnly:
access = mq.WriteOnly
case rOnly:
access = mq.ReadOnly
}
return mq.OpenOpts{
Name: name,
Access: access,
Create: create,
Exclusive: exclusive,
Block: block,
}
}
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