os: add support for long path names on aix RemoveAll

Follow CL 146020 and enable RemoveAll based on Unlinkat and Openat on
aix.

Updates #27029

Change-Id: I78b34ed671166ee6fa651d5f2025b88548ee6c68
Reviewed-on: https://go-review.googlesource.com/c/146937
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Clément Chigot <clement.chigot@atos.net>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/internal/syscall/unix/asm_solaris.s

@@ -6,5 +6,5 @@
 
 // System calls for Solaris are implemented in runtime/syscall_solaris.go
 
-TEXT ·sysvicall6(SB),NOSPLIT,$0-88
+TEXT ·syscall6(SB),NOSPLIT,$0-88
 	JMP	syscall·sysvicall6(SB)

src/internal/syscall/unix/at_aix.go

+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package unix
+
+//go:cgo_import_dynamic libc_fstatat fstatat "libc.a/shr_64.o"
+//go:cgo_import_dynamic libc_openat openat "libc.a/shr_64.o"
+//go:cgo_import_dynamic libc_unlinkat unlinkat "libc.a/shr_64.o"
+
+const (
+	AT_REMOVEDIR        = 0x1
+	AT_SYMLINK_NOFOLLOW = 0x1
+)

src/internal/syscall/unix/at_libc.go

+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build aix solaris
+
+package unix
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+//go:linkname procFstatat libc_fstatat
+//go:linkname procOpenat libc_openat
+//go:linkname procUnlinkat libc_unlinkat
+
+var (
+	procFstatat,
+	procOpenat,
+	procUnlinkat uintptr
+)
+
+func Unlinkat(dirfd int, path string, flags int) error {
+	p, err := syscall.BytePtrFromString(path)
+	if err != nil {
+		return err
+	}
+
+	_, _, errno := syscall6(uintptr(unsafe.Pointer(&procUnlinkat)), 3, uintptr(dirfd), uintptr(unsafe.Pointer(p)), uintptr(flags), 0, 0, 0)
+	if errno != 0 {
+		return errno
+	}
+
+	return nil
+}
+
+func Openat(dirfd int, path string, flags int, perm uint32) (int, error) {
+	p, err := syscall.BytePtrFromString(path)
+	if err != nil {
+		return 0, err
+	}
+
+	fd, _, errno := syscall6(uintptr(unsafe.Pointer(&procOpenat)), 4, uintptr(dirfd), uintptr(unsafe.Pointer(p)), uintptr(flags), uintptr(perm), 0, 0)
+	if errno != 0 {
+		return 0, errno
+	}
+
+	return int(fd), nil
+}
+
+func Fstatat(dirfd int, path string, stat *syscall.Stat_t, flags int) error {
+	p, err := syscall.BytePtrFromString(path)
+	if err != nil {
+		return err
+	}
+
+	_, _, errno := syscall6(uintptr(unsafe.Pointer(&procFstatat)), 4, uintptr(dirfd), uintptr(unsafe.Pointer(p)), uintptr(unsafe.Pointer(stat)), uintptr(flags), 0, 0)
+	if errno != 0 {
+		return errno
+	}
+
+	return nil
+}

src/internal/syscall/unix/at_solaris.go

@@ -4,72 +4,16 @@
 
 package unix
 
-import (
-	"syscall"
-	"unsafe"
-)
+import "syscall"
 
-// Implemented in runtime/syscall_solaris.go.
-func sysvicall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err syscall.Errno)
+// Implemented as sysvicall6 in runtime/syscall_solaris.go.
+func syscall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err syscall.Errno)
 
 //go:cgo_import_dynamic libc_fstatat fstatat "libc.so"
 //go:cgo_import_dynamic libc_openat openat "libc.so"
 //go:cgo_import_dynamic libc_unlinkat unlinkat "libc.so"
 
-//go:linkname procFstatat libc_fstatat
-//go:linkname procOpenat libc_openat
-//go:linkname procUnlinkat libc_unlinkat
-
-var (
-	procFstatat,
-	procOpenat,
-	procUnlinkat uintptr
+const (
+	AT_REMOVEDIR        = 0x1
+	AT_SYMLINK_NOFOLLOW = 0x1000
 )
-
-const AT_REMOVEDIR = 0x1
-const AT_SYMLINK_NOFOLLOW = 0x1000
-
-func Unlinkat(dirfd int, path string, flags int) error {
-	var p *byte
-	p, err := syscall.BytePtrFromString(path)
-	if err != nil {
-		return err
-	}
-
-	_, _, errno := sysvicall6(uintptr(unsafe.Pointer(&procUnlinkat)), 3, uintptr(dirfd), uintptr(unsafe.Pointer(p)), uintptr(flags), 0, 0, 0)
-	if errno != 0 {
-		return errno
-	}
-
-	return nil
-}
-
-func Openat(dirfd int, path string, flags int, perm uint32) (int, error) {
-	var p *byte
-	p, err := syscall.BytePtrFromString(path)
-	if err != nil {
-		return 0, err
-	}
-
-	fd, _, errno := sysvicall6(uintptr(unsafe.Pointer(&procOpenat)), 4, uintptr(dirfd), uintptr(unsafe.Pointer(p)), uintptr(flags), uintptr(perm), 0, 0)
-	if errno != 0 {
-		return 0, errno
-	}
-
-	return int(fd), nil
-}
-
-func Fstatat(dirfd int, path string, stat *syscall.Stat_t, flags int) error {
-	var p *byte
-	p, err := syscall.BytePtrFromString(path)
-	if err != nil {
-		return err
-	}
-
-	_, _, errno := sysvicall6(uintptr(unsafe.Pointer(&procFstatat)), 4, uintptr(dirfd), uintptr(unsafe.Pointer(p)), uintptr(unsafe.Pointer(stat)), uintptr(flags), 0, 0)
-	if errno != 0 {
-		return errno
-	}
-
-	return nil
-}

src/os/removeall_at.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package os
 

src/os/removeall_noat.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !linux,!darwin,!freebsd,!openbsd,!netbsd,!dragonfly,!solaris
+// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris
 
 package os
 

src/os/removeall_test.go

@@ -162,7 +162,7 @@ func TestRemoveAllLarge(t *testing.T) {
 
 func TestRemoveAllLongPath(t *testing.T) {
 	switch runtime.GOOS {
-	case "linux", "darwin", "freebsd", "openbsd", "netbsd", "dragonfly", "solaris":
+	case "aix", "darwin", "dragonfly", "freebsd", "linux", "netbsd", "openbsd", "solaris":
 		break
 	default:
 		t.Skip("skipping for not implemented platforms")
@@ -212,7 +212,7 @@ func TestRemoveAllLongPath(t *testing.T) {
 
 func TestRemoveAllDot(t *testing.T) {
 	switch runtime.GOOS {
-	case "linux", "darwin", "freebsd", "openbsd", "netbsd", "dragonfly", "solaris":
+	case "aix", "darwin", "dragonfly", "freebsd", "linux", "netbsd", "openbsd", "solaris":
 		break
 	default:
 		t.Skip("skipping for not implemented platforms")