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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 "math"
// shmat(2) flags. Source: include/uapi/linux/shm.h
const (
SHM_RDONLY = 010000 // Read-only access.
SHM_RND = 020000 // Round attach address to SHMLBA boundary.
SHM_REMAP = 040000 // Take-over region on attach.
SHM_EXEC = 0100000 // Execution access.
)
// IPCPerm.Mode upper byte flags. Source: include/linux/shm.h
const (
SHM_DEST = 01000 // Segment will be destroyed on last detach.
SHM_LOCKED = 02000 // Segment will not be swapped.
SHM_HUGETLB = 04000 // Segment will use huge TLB pages.
SHM_NORESERVE = 010000 // Don't check for reservations.
)
// Additional Linux-only flags for shmctl(2). Source: include/uapi/linux/shm.h
const (
SHM_LOCK = 11
SHM_UNLOCK = 12
SHM_STAT = 13
SHM_INFO = 14
)
// SHM defaults as specified by linux. Source: include/uapi/linux/shm.h
const (
SHMMIN = 1
SHMMNI = 4096
SHMMAX = math.MaxUint64 - 1<<24
SHMALL = math.MaxUint64 - 1<<24
SHMSEG = 4096
)
// ShmidDS is equivalent to struct shmid64_ds. Source:
// include/uapi/asm-generic/shmbuf.h
//
// +marshal
type ShmidDS struct {
ShmPerm IPCPerm
ShmSegsz uint64
ShmAtime TimeT
ShmDtime TimeT
ShmCtime TimeT
ShmCpid int32
ShmLpid int32
ShmNattach uint64
Unused4 uint64
Unused5 uint64
}
// ShmParams is equivalent to struct shminfo. Source: include/uapi/linux/shm.h
//
// +marshal
type ShmParams struct {
ShmMax uint64
ShmMin uint64
ShmMni uint64
ShmSeg uint64
ShmAll uint64
}
// ShmInfo is equivalent to struct shm_info. Source: include/uapi/linux/shm.h
//
// +marshal
type ShmInfo struct {
UsedIDs int32 // Number of currently existing segments.
_ [4]byte
ShmTot uint64 // Total number of shared memory pages.
ShmRss uint64 // Number of resident shared memory pages.
ShmSwp uint64 // Number of swapped shared memory pages.
SwapAttempts uint64 // Unused since Linux 2.4.
SwapSuccesses uint64 // Unused since Linux 2.4.
}
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