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Etienne PerotandgVisor bot
056a85f39d
This change marks all ABI-related structs with `structs.HostLayout`, which was introduced in Go 1.23: https://pkg.go.dev/[email protected]#HostLayout This is intended to force the Go compiler to preserve the layout of the struct, removing it from the liberty of reordering fields as it sees fit. Adds a check automatically generated by our `go_library` rule wrapper which verifies this recursively for all exported structs in a package. Fixes issue #10693. PiperOrigin-RevId: 860238103
114 lines
3.1 KiB
Go
114 lines
3.1 KiB
Go
// Copyright 2021 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package linux
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import (
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"structs"
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"gvisor.dev/gvisor/pkg/marshal/primitive"
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)
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// Linux-specific control commands. Source: include/uapi/linux/msg.h
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const (
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MSG_STAT = 11
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MSG_INFO = 12
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MSG_STAT_ANY = 13
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)
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// msgrcv(2) options. Source: include/uapi/linux/msg.h
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const (
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MSG_NOERROR = 010000 // No error if message is too big.
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MSG_EXCEPT = 020000 // Receive any message except of specified type.
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MSG_COPY = 040000 // Copy (not remove) all queue messages.
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)
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// System-wide limits for message queues. Source: include/uapi/linux/msg.h
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const (
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MSGMNI = 32000 // Maximum number of message queue identifiers.
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MSGMAX = 8192 // Maximum size of message (bytes).
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MSGMNB = 16384 // Default max size of a message queue.
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)
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// System-wide limits. Unused. Source: include/uapi/linux/msg.h
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const (
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MSGPOOL = (MSGMNI * MSGMNB / 1024)
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MSGTQL = MSGMNB
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MSGMAP = MSGMNB
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MSGSSZ = 16
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// MSGSEG is simplified due to the inexistance of a ternary operator.
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MSGSEG = 0xffff
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)
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// MsqidDS is equivalent to struct msqid64_ds. Source:
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// include/uapi/asm-generic/shmbuf.h
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//
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// +marshal
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type MsqidDS struct {
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_ structs.HostLayout
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MsgPerm IPCPerm // IPC permissions.
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MsgStime TimeT // Last msgsnd time.
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MsgRtime TimeT // Last msgrcv time.
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MsgCtime TimeT // Last change time.
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MsgCbytes uint64 // Current number of bytes on the queue.
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MsgQnum uint64 // Number of messages in the queue.
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MsgQbytes uint64 // Max number of bytes in the queue.
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MsgLspid int32 // PID of last msgsnd.
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MsgLrpid int32 // PID of last msgrcv.
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unused4 uint64
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unused5 uint64
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}
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// MsgBuf is equivalent to struct msgbuf. Source: include/uapi/linux/msg.h
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//
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// +marshal dynamic
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type MsgBuf struct {
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_ structs.HostLayout
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Type primitive.Int64
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Text primitive.ByteSlice `hostlayout:"ignore"`
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}
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// SizeBytes implements marshal.Marshallable.SizeBytes.
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func (b *MsgBuf) SizeBytes() int {
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return b.Type.SizeBytes() + b.Text.SizeBytes()
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}
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// MarshalBytes implements marshal.Marshallable.MarshalBytes.
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func (b *MsgBuf) MarshalBytes(dst []byte) []byte {
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dst = b.Type.MarshalUnsafe(dst)
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return b.Text.MarshalBytes(dst)
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}
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// UnmarshalBytes implements marshal.Marshallable.UnmarshalBytes.
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func (b *MsgBuf) UnmarshalBytes(src []byte) []byte {
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src = b.Type.UnmarshalUnsafe(src)
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return b.Text.UnmarshalBytes(src)
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}
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// MsgInfo is equivalent to struct msginfo. Source: include/uapi/linux/msg.h
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//
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// +marshal
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type MsgInfo struct {
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_ structs.HostLayout
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MsgPool int32
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MsgMap int32
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MsgMax int32
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MsgMnb int32
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MsgMni int32
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MsgSsz int32
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MsgTql int32
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MsgSeg uint16 `marshal:"unaligned"`
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}
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