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// Copyright 2018 Google LLC
//
// 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 (
"fmt"
"strings"
"gvisor.googlesource.com/gvisor/pkg/abi"
"gvisor.googlesource.com/gvisor/pkg/binary"
)
// Constants for open(2).
const (
O_ACCMODE = 00000003
O_RDONLY = 00000000
O_WRONLY = 00000001
O_RDWR = 00000002
O_CREAT = 00000100
O_EXCL = 00000200
O_NOCTTY = 00000400
O_TRUNC = 00001000
O_APPEND = 00002000
O_NONBLOCK = 00004000
O_ASYNC = 00020000
O_DIRECT = 00040000
O_LARGEFILE = 00100000
O_DIRECTORY = 00200000
O_NOFOLLOW = 00400000
O_CLOEXEC = 02000000
O_SYNC = 04010000
O_PATH = 010000000
)
// Constants for fstatat(2).
const (
AT_SYMLINK_NOFOLLOW = 0x100
)
// Constants for mount(2).
const (
MS_RDONLY = 0x1
MS_NOSUID = 0x2
MS_NODEV = 0x4
MS_NOEXEC = 0x8
MS_SYNCHRONOUS = 0x10
MS_REMOUNT = 0x20
MS_MANDLOCK = 0x40
MS_DIRSYNC = 0x80
MS_NOATIME = 0x400
MS_NODIRATIME = 0x800
MS_BIND = 0x1000
MS_MOVE = 0x2000
MS_REC = 0x4000
MS_POSIXACL = 0x10000
MS_UNBINDABLE = 0x20000
MS_PRIVATE = 0x40000
MS_SLAVE = 0x80000
MS_SHARED = 0x100000
MS_RELATIME = 0x200000
MS_KERNMOUNT = 0x400000
MS_I_VERSION = 0x800000
MS_STRICTATIME = 0x1000000
MS_MGC_VAL = 0xC0ED0000
MS_MGC_MSK = 0xffff0000
)
// Constants for umount2(2).
const (
MNT_FORCE = 0x1
MNT_DETACH = 0x2
MNT_EXPIRE = 0x4
UMOUNT_NOFOLLOW = 0x8
)
// Constants for unlinkat(2).
const (
AT_REMOVEDIR = 0x200
)
// Constants for linkat(2) and fchownat(2).
const (
AT_SYMLINK_FOLLOW = 0x400
AT_EMPTY_PATH = 0x1000
)
// Constants for all file-related ...at(2) syscalls.
const (
AT_FDCWD = -100
)
// Special values for the ns field in utimensat(2).
const (
UTIME_NOW = ((1 << 30) - 1)
UTIME_OMIT = ((1 << 30) - 2)
)
// MaxSymlinkTraversals is the maximum number of links that will be followed by
// the kernel to resolve a symlink.
const MaxSymlinkTraversals = 40
// Constants for flock(2).
const (
LOCK_SH = 1 // shared lock
LOCK_EX = 2 // exclusive lock
LOCK_NB = 4 // or'd with one of the above to prevent blocking
LOCK_UN = 8 // remove lock
)
// Values for mode_t.
const (
FileTypeMask = 0170000
ModeSocket = 0140000
ModeSymlink = 0120000
ModeRegular = 0100000
ModeBlockDevice = 060000
ModeDirectory = 040000
ModeCharacterDevice = 020000
ModeNamedPipe = 010000
ModeSetUID = 04000
ModeSetGID = 02000
ModeSticky = 01000
ModeUserAll = 0700
ModeUserRead = 0400
ModeUserWrite = 0200
ModeUserExec = 0100
ModeGroupAll = 0070
ModeGroupRead = 0040
ModeGroupWrite = 0020
ModeGroupExec = 0010
ModeOtherAll = 0007
ModeOtherRead = 0004
ModeOtherWrite = 0002
ModeOtherExec = 0001
PermissionsMask = 0777
)
// Values for preadv2/pwritev2.
const (
RWF_HIPRI = 0x00000001
RWF_DSYNC = 0x00000002
RWF_SYNC = 0x00000004
RWF_VALID = RWF_HIPRI | RWF_DSYNC | RWF_SYNC
)
// Stat represents struct stat.
type Stat struct {
Dev uint64
Ino uint64
Nlink uint64
Mode uint32
UID uint32
GID uint32
X_pad0 int32
Rdev uint64
Size int64
Blksize int64
Blocks int64
ATime Timespec
MTime Timespec
CTime Timespec
X_unused [3]int64
}
// SizeOfStat is the size of a Stat struct.
var SizeOfStat = binary.Size(Stat{})
// FileMode represents a mode_t.
type FileMode uint
// Permissions returns just the permission bits.
func (m FileMode) Permissions() FileMode {
return m & PermissionsMask
}
// FileType returns just the file type bits.
func (m FileMode) FileType() FileMode {
return m & FileTypeMask
}
// ExtraBits returns everything but the file type and permission bits.
func (m FileMode) ExtraBits() FileMode {
return m &^ (PermissionsMask | FileTypeMask)
}
// String returns a string representation of m.
func (m FileMode) String() string {
var s []string
if ft := m.FileType(); ft != 0 {
s = append(s, fileType.Parse(uint64(ft)))
}
if eb := m.ExtraBits(); eb != 0 {
s = append(s, modeExtraBits.Parse(uint64(eb)))
}
s = append(s, fmt.Sprintf("0o%o", m.Permissions()))
return strings.Join(s, "|")
}
var modeExtraBits = abi.FlagSet{
{
Flag: ModeSetUID,
Name: "S_ISUID",
},
{
Flag: ModeSetGID,
Name: "S_ISGID",
},
{
Flag: ModeSticky,
Name: "S_ISVTX",
},
}
var fileType = abi.ValueSet{
ModeSocket: "S_IFSOCK",
ModeSymlink: "S_IFLINK",
ModeRegular: "S_IFREG",
ModeBlockDevice: "S_IFBLK",
ModeDirectory: "S_IFDIR",
ModeCharacterDevice: "S_IFCHR",
ModeNamedPipe: "S_IFIFO",
}
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