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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 "encoding/binary"
// AIORingSize is sizeof(struct aio_ring).
const AIORingSize = 32
// I/O commands.
const (
IOCB_CMD_PREAD = 0
IOCB_CMD_PWRITE = 1
IOCB_CMD_FSYNC = 2
IOCB_CMD_FDSYNC = 3
// 4 was the experimental IOCB_CMD_PREADX.
IOCB_CMD_POLL = 5
IOCB_CMD_NOOP = 6
IOCB_CMD_PREADV = 7
IOCB_CMD_PWRITEV = 8
)
// I/O flags.
const (
IOCB_FLAG_RESFD = 1
IOCB_FLAG_IOPRIO = 2
)
// IOCallback describes an I/O request.
//
// The priority field is currently ignored in the implementation below. Also
// note that the IOCB_FLAG_RESFD feature is not supported.
type IOCallback struct {
Data uint64
Key uint32
_ uint32
OpCode uint16
ReqPrio int16
FD int32
Buf uint64
Bytes uint64
Offset int64
Reserved2 uint64
Flags uint32
// eventfd to signal if IOCB_FLAG_RESFD is set in flags.
ResFD int32
}
// IOEvent describes an I/O result.
//
// +stateify savable
type IOEvent struct {
Data uint64
Obj uint64
Result int64
Result2 int64
}
// IOEventSize is the size of an ioEvent encoded.
var IOEventSize = binary.Size(IOEvent{})
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