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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/errors/linuxerr"
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
"gvisor.dev/gvisor/pkg/sentry/kernel/ipc"
)
// Msgget implements msgget(2).
func Msgget(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
key := ipc.Key(args[0].Int())
flag := args[1].Int()
private := key == linux.IPC_PRIVATE
create := flag&linux.IPC_CREAT == linux.IPC_CREAT
exclusive := flag&linux.IPC_EXCL == linux.IPC_EXCL
mode := linux.FileMode(flag & 0777)
r := t.IPCNamespace().MsgqueueRegistry()
queue, err := r.FindOrCreate(t, key, mode, private, create, exclusive)
if err != nil {
return 0, nil, err
}
return uintptr(queue.ID()), nil, nil
}
// Msgctl implements msgctl(2).
func Msgctl(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
id := ipc.ID(args[0].Int())
cmd := args[1].Int()
creds := auth.CredentialsFromContext(t)
switch cmd {
case linux.IPC_RMID:
return 0, nil, t.IPCNamespace().MsgqueueRegistry().Remove(id, creds)
default:
return 0, nil, linuxerr.EINVAL
}
}
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