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x/sys/unix: add support for O_TMPFILE in Linux

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Since Linux 3.11, O_TMPFILE flag can be used in open syscall to create
an unnamed file in a directory. The file occupies space in the
filesystem, and can be given a name using linkat syscall. If the file is
closed without being given a name, its contents are deleted.

See the manpage open(2) in Linux for details.

Exports O_TMPFILE for Linux in 386 and amd64 (other architectures
already had it). Exports Linkat syscall and AT_SYMLINK_FOLLOW (used for
giving a name to the file) for all Linux in all architectures.

Fixes golang/go#7830.

Change-Id: Ib82e44f405b227e227b9cbf317c2657b32e046f5
Reviewed-on: https://go-review.googlesource.com/21003
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Caio Marcelo de Oliveira Filho
2016-03-22 16:29:55 -03:00
committed by Brad Fitzpatrick
parent 9d4e42a206
commit 23999e87b4
20 changed files with 24 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
unix/syscall_linux.go
View File

@@ -36,10 +36,10 @@ func Creat(path string, mode uint32) (fd int, err error) {
return Open(path, O_CREAT|O_WRONLY|O_TRUNC, mode)
}
//sys linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error)
//sys Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error)
func Link(oldpath string, newpath string) (err error) {
return linkat(AT_FDCWD, oldpath, AT_FDCWD, newpath, 0)
return Linkat(AT_FDCWD, oldpath, AT_FDCWD, newpath, 0)
}
func Mkdir(path string, mode uint32) (err error) {

1
unix/types_linux.go
View File

@@ -400,6 +400,7 @@ type EpollEvent C.struct_my_epoll_event
const (
AT_FDCWD = C.AT_FDCWD
AT_REMOVEDIR = C.AT_REMOVEDIR
AT_SYMLINK_FOLLOW = C.AT_SYMLINK_FOLLOW
AT_SYMLINK_NOFOLLOW = C.AT_SYMLINK_NOFOLLOW
)

1
unix/zerrors_linux_386.go
View File

@@ -826,6 +826,7 @@ const (
O_RDWR = 0x2
O_RSYNC = 0x101000
O_SYNC = 0x101000
O_TMPFILE = 0x410000
O_TRUNC = 0x200
O_WRONLY = 0x1
PACKET_ADD_MEMBERSHIP = 0x1

1
unix/zerrors_linux_amd64.go
View File

@@ -826,6 +826,7 @@ const (
O_RDWR = 0x2
O_RSYNC = 0x101000
O_SYNC = 0x101000
O_TMPFILE = 0x410000
O_TRUNC = 0x200
O_WRONLY = 0x1
PACKET_ADD_MEMBERSHIP = 0x1

2
unix/zsyscall_linux_386.go
View File

@@ -14,7 +14,7 @@ var _ syscall.Errno
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
func Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
var _p0 *byte
_p0, err = BytePtrFromString(oldpath)
if err != nil {

2
unix/zsyscall_linux_amd64.go
View File

@@ -14,7 +14,7 @@ var _ syscall.Errno
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
func Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
var _p0 *byte
_p0, err = BytePtrFromString(oldpath)
if err != nil {

2
unix/zsyscall_linux_arm.go
View File

@@ -14,7 +14,7 @@ var _ syscall.Errno
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
func Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
var _p0 *byte
_p0, err = BytePtrFromString(oldpath)
if err != nil {

2
unix/zsyscall_linux_arm64.go
View File

@@ -14,7 +14,7 @@ var _ syscall.Errno
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
func Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
var _p0 *byte
_p0, err = BytePtrFromString(oldpath)
if err != nil {

2
unix/zsyscall_linux_mips64.go
View File

@@ -14,7 +14,7 @@ var _ syscall.Errno
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
func Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
var _p0 *byte
_p0, err = BytePtrFromString(oldpath)
if err != nil {

2
unix/zsyscall_linux_mips64le.go
View File

@@ -14,7 +14,7 @@ var _ syscall.Errno
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
func Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
var _p0 *byte
_p0, err = BytePtrFromString(oldpath)
if err != nil {

2
unix/zsyscall_linux_ppc64.go
View File

@@ -14,7 +14,7 @@ var _ syscall.Errno
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
func Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
var _p0 *byte
_p0, err = BytePtrFromString(oldpath)
if err != nil {

2
unix/zsyscall_linux_ppc64le.go
View File

@@ -14,7 +14,7 @@ var _ syscall.Errno
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
func Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
var _p0 *byte
_p0, err = BytePtrFromString(oldpath)
if err != nil {

3
unix/ztypes_linux_386.go
View File

@@ -574,8 +574,9 @@ type EpollEvent struct {
const (
AT_FDCWD = -0x64
AT_SYMLINK_NOFOLLOW = 0x100
AT_REMOVEDIR = 0x200
AT_SYMLINK_FOLLOW = 0x400
AT_SYMLINK_NOFOLLOW = 0x100
)
type Termios struct {

3
unix/ztypes_linux_amd64.go
View File

@@ -592,8 +592,9 @@ type EpollEvent struct {
const (
AT_FDCWD = -0x64
AT_SYMLINK_NOFOLLOW = 0x100
AT_REMOVEDIR = 0x200
AT_SYMLINK_FOLLOW = 0x400
AT_SYMLINK_NOFOLLOW = 0x100
)
type Termios struct {

3
unix/ztypes_linux_arm.go
View File

@@ -563,8 +563,9 @@ type EpollEvent struct {
const (
AT_FDCWD = -0x64
AT_SYMLINK_NOFOLLOW = 0x100
AT_REMOVEDIR = 0x200
AT_SYMLINK_FOLLOW = 0x400
AT_SYMLINK_NOFOLLOW = 0x100
)
type Termios struct {

1
unix/ztypes_linux_arm64.go
View File

@@ -580,6 +580,7 @@ type EpollEvent struct {
const (
AT_FDCWD = -0x64
AT_REMOVEDIR = 0x200
AT_SYMLINK_FOLLOW = 0x400
AT_SYMLINK_NOFOLLOW = 0x100
)

1
unix/ztypes_linux_mips64.go
View File

@@ -585,6 +585,7 @@ type EpollEvent struct {
const (
AT_FDCWD = -0x64
AT_REMOVEDIR = 0x200
AT_SYMLINK_FOLLOW = 0x400
AT_SYMLINK_NOFOLLOW = 0x100
)

1
unix/ztypes_linux_mips64le.go
View File

@@ -585,6 +585,7 @@ type EpollEvent struct {
const (
AT_FDCWD = -0x64
AT_REMOVEDIR = 0x200
AT_SYMLINK_FOLLOW = 0x400
AT_SYMLINK_NOFOLLOW = 0x100
)

1
unix/ztypes_linux_ppc64.go
View File

@@ -590,6 +590,7 @@ type EpollEvent struct {
const (
AT_FDCWD = -0x64
AT_REMOVEDIR = 0x200
AT_SYMLINK_FOLLOW = 0x400
AT_SYMLINK_NOFOLLOW = 0x100
)

1
unix/ztypes_linux_ppc64le.go
View File

@@ -590,6 +590,7 @@ type EpollEvent struct {
const (
AT_FDCWD = -0x64
AT_REMOVEDIR = 0x200
AT_SYMLINK_FOLLOW = 0x400
AT_SYMLINK_NOFOLLOW = 0x100
)