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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/marshal/primitive"
)
// Linux-specific control commands. Source: include/uapi/linux/msg.h
const (
MSG_STAT = 11
MSG_INFO = 12
MSG_STAT_ANY = 13
)
// msgrcv(2) options. Source: include/uapi/linux/msg.h
const (
MSG_NOERROR = 010000 // No error if message is too big.
MSG_EXCEPT = 020000 // Receive any message except of specified type.
MSG_COPY = 040000 // Copy (not remove) all queue messages.
)
// System-wide limits for message queues. Source: include/uapi/linux/msg.h
const (
MSGMNI = 32000 // Maximum number of message queue identifiers.
MSGMAX = 8192 // Maximum size of message (bytes).
MSGMNB = 16384 // Default max size of a message queue.
)
// System-wide limits. Unused. Source: include/uapi/linux/msg.h
const (
MSGPOOL = (MSGMNI * MSGMNB / 1024)
MSGTQL = MSGMNB
MSGMAP = MSGMNB
MSGSSZ = 16
// MSGSEG is simplified due to the inexistance of a ternary operator.
MSGSEG = 0xffff
)
// MsqidDS is equivelant to struct msqid64_ds. Source:
// include/uapi/asm-generic/shmbuf.h
//
// +marshal
type MsqidDS struct {
MsgPerm IPCPerm // IPC permissions.
MsgStime TimeT // Last msgsnd time.
MsgRtime TimeT // Last msgrcv time.
MsgCtime TimeT // Last change time.
MsgCbytes uint64 // Current number of bytes on the queue.
MsgQnum uint64 // Number of messages in the queue.
MsgQbytes uint64 // Max number of bytes in the queue.
MsgLspid int32 // PID of last msgsnd.
MsgLrpid int32 // PID of last msgrcv.
unused4 uint64
unused5 uint64
}
// MsgBuf is equivelant to struct msgbuf. Source: include/uapi/linux/msg.h
//
// +marshal dynamic
type MsgBuf struct {
Type primitive.Int64
Text primitive.ByteSlice
}
// SizeBytes implements marshal.Marshallable.SizeBytes.
func (b *MsgBuf) SizeBytes() int {
return b.Type.SizeBytes() + b.Text.SizeBytes()
}
// MarshalBytes implements marshal.Marshallable.MarshalBytes.
func (b *MsgBuf) MarshalBytes(dst []byte) {
b.Type.MarshalUnsafe(dst)
b.Text.MarshalBytes(dst[b.Type.SizeBytes():])
}
// UnmarshalBytes implements marshal.Marshallable.UnmarshalBytes.
func (b *MsgBuf) UnmarshalBytes(src []byte) {
b.Type.UnmarshalUnsafe(src)
b.Text.UnmarshalBytes(src[b.Type.SizeBytes():])
}
// MsgInfo is equivelant to struct msginfo. Source: include/uapi/linux/msg.h
//
// +marshal
type MsgInfo struct {
MsgPool int32
MsgMap int32
MsgMax int32
MsgMnb int32
MsgMni int32
MsgSsz int32
MsgTql int32
MsgSeg uint16 `marshal:"unaligned"`
}
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