syscall: check faccessat flags parameter on Linux

Port CL 119495 from golang.org/x/sys/unix to the syscall package.

Currently Linux faccessat(2) syscall implementation doesn't support the
flags parameter. As per the discussion in #25845, permit the same flags
as glibc [1].

[1] https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/faccessat.c;h=ea42b2303ff4b2d2d6548ea04376fb265f773436;hb=HEAD

Updates #25845

Change-Id: I132b33275a9cc72b3a97acea5482806c7f47d7f7
Reviewed-on: https://go-review.googlesource.com/120015
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

25 files changed, 219 insertions, 166 deletions

diff --git a/src/syscall/syscall_linux.go b/src/syscall/syscall_linux.go
index 8d0532e216..1a304c4966 100644
--- a/src/syscall/syscall_linux.go
+++ b/src/syscall/syscall_linux.go
@@ -35,6 +35,17 @@ func Creat(path string, mode uint32) (fd int, err error) {
 	return Open(path, O_CREAT|O_WRONLY|O_TRUNC, mode)
 }
 
+//sys	faccessat(dirfd int, path string, mode uint32) (err error)
+
+func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
+	if flags & ^(_AT_SYMLINK_NOFOLLOW|_AT_EACCESS) != 0 {
+		return EINVAL
+	} else if flags&(_AT_SYMLINK_NOFOLLOW|_AT_EACCESS) != 0 {
+		return EOPNOTSUPP
+	}
+	return faccessat(dirfd, path, mode)
+}
+
 //sys	fchmodat(dirfd int, path string, mode uint32) (err error)
 
 func Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) {
@@ -840,7 +851,6 @@ func Mount(source string, target string, fstype string, flags uintptr, data stri
 //sysnb	EpollCreate(size int) (fd int, err error)
 //sysnb	EpollCreate1(flag int) (fd int, err error)
 //sysnb	EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error)
-//sys	Faccessat(dirfd int, path string, mode uint32, flags int) (err error)
 //sys	Fallocate(fd int, mode uint32, off int64, len int64) (err error)
 //sys	Fchdir(fd int) (err error)
 //sys	Fchmod(fd int, mode uint32) (err error)
diff --git a/src/syscall/syscall_linux_test.go b/src/syscall/syscall_linux_test.go
index 4490fc24ca..24158bb8b8 100644
--- a/src/syscall/syscall_linux_test.go
+++ b/src/syscall/syscall_linux_test.go
@@ -56,8 +56,39 @@ func touch(t *testing.T, name string) {
 const (
 	_AT_SYMLINK_NOFOLLOW = 0x100
 	_AT_FDCWD            = -0x64
+	_AT_EACCESS          = 0x200
 )
 
+func TestFaccessat(t *testing.T) {
+	defer chtmpdir(t)()
+	touch(t, "file1")
+
+	err := syscall.Faccessat(_AT_FDCWD, "file1", syscall.O_RDONLY, 0)
+	if err != nil {
+		t.Errorf("Faccessat: unexpected error: %v", err)
+	}
+
+	err = syscall.Faccessat(_AT_FDCWD, "file1", syscall.O_RDONLY, 2)
+	if err != syscall.EINVAL {
+		t.Errorf("Faccessat: unexpected error: %v, want EINVAL", err)
+	}
+
+	err = syscall.Faccessat(_AT_FDCWD, "file1", syscall.O_RDONLY, _AT_EACCESS)
+	if err != syscall.EOPNOTSUPP {
+		t.Errorf("Faccessat: unexpected error: %v, want EOPNOTSUPP", err)
+	}
+
+	err = os.Symlink("file1", "symlink1")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = syscall.Faccessat(_AT_FDCWD, "symlink1", syscall.O_RDONLY, _AT_SYMLINK_NOFOLLOW)
+	if err != syscall.EOPNOTSUPP {
+		t.Errorf("Faccessat: unexpected error: %v, want EOPNOTSUPP", err)
+	}
+}
+
 func TestFchmodat(t *testing.T) {
 	defer chtmpdir(t)()
 
diff --git a/src/syscall/types_linux.go b/src/syscall/types_linux.go
index 125f69d60e..3c4c2f2cfd 100644
--- a/src/syscall/types_linux.go
+++ b/src/syscall/types_linux.go
@@ -405,6 +405,7 @@ const (
 	_AT_FDCWD            = C.AT_FDCWD
 	_AT_REMOVEDIR        = C.AT_REMOVEDIR
 	_AT_SYMLINK_NOFOLLOW = C.AT_SYMLINK_NOFOLLOW
+	_AT_EACCESS          = C.AT_EACCESS
 )
 
 // Terminal handling
diff --git a/src/syscall/zsyscall_linux_386.go b/src/syscall/zsyscall_linux_386.go
index 2877be60e7..ef79b3e3e2 100644
--- a/src/syscall/zsyscall_linux_386.go
+++ b/src/syscall/zsyscall_linux_386.go
@@ -9,6 +9,21 @@ import "unsafe"
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func faccessat(dirfd int, path string, mode uint32) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func fchmodat(dirfd int, path string, mode uint32) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -354,21 +369,6 @@ func EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall6(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(flags), 0, 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Fallocate(fd int, mode uint32, off int64, len int64) (err error) {
 	_, _, e1 := Syscall6(SYS_FALLOCATE, uintptr(fd), uintptr(mode), uintptr(off), uintptr(off>>32), uintptr(len), uintptr(len>>32))
 	if e1 != 0 {
diff --git a/src/syscall/zsyscall_linux_amd64.go b/src/syscall/zsyscall_linux_amd64.go
index 59d376a45c..b6638269be 100644
--- a/src/syscall/zsyscall_linux_amd64.go
+++ b/src/syscall/zsyscall_linux_amd64.go
@@ -9,6 +9,21 @@ import "unsafe"
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func faccessat(dirfd int, path string, mode uint32) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func fchmodat(dirfd int, path string, mode uint32) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -354,21 +369,6 @@ func EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall6(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(flags), 0, 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Fallocate(fd int, mode uint32, off int64, len int64) (err error) {
 	_, _, e1 := Syscall6(SYS_FALLOCATE, uintptr(fd), uintptr(mode), uintptr(off), uintptr(len), 0, 0)
 	if e1 != 0 {
diff --git a/src/syscall/zsyscall_linux_arm.go b/src/syscall/zsyscall_linux_arm.go
index 4baf713e61..216924ff20 100644
--- a/src/syscall/zsyscall_linux_arm.go
+++ b/src/syscall/zsyscall_linux_arm.go
@@ -9,6 +9,21 @@ import "unsafe"
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func faccessat(dirfd int, path string, mode uint32) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func fchmodat(dirfd int, path string, mode uint32) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -354,21 +369,6 @@ func EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall6(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(flags), 0, 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Fallocate(fd int, mode uint32, off int64, len int64) (err error) {
 	_, _, e1 := Syscall6(SYS_FALLOCATE, uintptr(fd), uintptr(mode), uintptr(off), uintptr(off>>32), uintptr(len), uintptr(len>>32))
 	if e1 != 0 {
diff --git a/src/syscall/zsyscall_linux_arm64.go b/src/syscall/zsyscall_linux_arm64.go
index 4c79cffa9f..f2dffa4bac 100644
--- a/src/syscall/zsyscall_linux_arm64.go
+++ b/src/syscall/zsyscall_linux_arm64.go
@@ -9,6 +9,21 @@ import "unsafe"
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func faccessat(dirfd int, path string, mode uint32) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func fchmodat(dirfd int, path string, mode uint32) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -354,21 +369,6 @@ func EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall6(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(flags), 0, 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Fallocate(fd int, mode uint32, off int64, len int64) (err error) {
 	_, _, e1 := Syscall6(SYS_FALLOCATE, uintptr(fd), uintptr(mode), uintptr(off), uintptr(len), 0, 0)
 	if e1 != 0 {
diff --git a/src/syscall/zsyscall_linux_mips.go b/src/syscall/zsyscall_linux_mips.go
index 787b5d7b7e..72eabac8ec 100644
--- a/src/syscall/zsyscall_linux_mips.go
+++ b/src/syscall/zsyscall_linux_mips.go
@@ -9,6 +9,21 @@ import "unsafe"
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func faccessat(dirfd int, path string, mode uint32) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func fchmodat(dirfd int, path string, mode uint32) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -354,21 +369,6 @@ func EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall6(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(flags), 0, 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Fallocate(fd int, mode uint32, off int64, len int64) (err error) {
 	_, _, e1 := Syscall6(SYS_FALLOCATE, uintptr(fd), uintptr(mode), uintptr(off>>32), uintptr(off), uintptr(len>>32), uintptr(len))
 	if e1 != 0 {
diff --git a/src/syscall/zsyscall_linux_mips64.go b/src/syscall/zsyscall_linux_mips64.go
index 63cae60d47..4180ed1908 100644
--- a/src/syscall/zsyscall_linux_mips64.go
+++ b/src/syscall/zsyscall_linux_mips64.go
@@ -9,6 +9,21 @@ import "unsafe"
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func faccessat(dirfd int, path string, mode uint32) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func fchmodat(dirfd int, path string, mode uint32) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -354,21 +369,6 @@ func EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall6(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(flags), 0, 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Fallocate(fd int, mode uint32, off int64, len int64) (err error) {
 	_, _, e1 := Syscall6(SYS_FALLOCATE, uintptr(fd), uintptr(mode), uintptr(off), uintptr(len), 0, 0)
 	if e1 != 0 {
diff --git a/src/syscall/zsyscall_linux_mips64le.go b/src/syscall/zsyscall_linux_mips64le.go
index e2cf9b8910..3b4b5da539 100644
--- a/src/syscall/zsyscall_linux_mips64le.go
+++ b/src/syscall/zsyscall_linux_mips64le.go
@@ -9,6 +9,21 @@ import "unsafe"
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func faccessat(dirfd int, path string, mode uint32) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func fchmodat(dirfd int, path string, mode uint32) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -354,21 +369,6 @@ func EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall6(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(flags), 0, 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Fallocate(fd int, mode uint32, off int64, len int64) (err error) {
 	_, _, e1 := Syscall6(SYS_FALLOCATE, uintptr(fd), uintptr(mode), uintptr(off), uintptr(len), 0, 0)
 	if e1 != 0 {
diff --git a/src/syscall/zsyscall_linux_mipsle.go b/src/syscall/zsyscall_linux_mipsle.go
index be5294cd1c..7114093a11 100644
--- a/src/syscall/zsyscall_linux_mipsle.go
+++ b/src/syscall/zsyscall_linux_mipsle.go
@@ -9,6 +9,21 @@ import "unsafe"
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func faccessat(dirfd int, path string, mode uint32) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func fchmodat(dirfd int, path string, mode uint32) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -354,21 +369,6 @@ func EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall6(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(flags), 0, 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Fallocate(fd int, mode uint32, off int64, len int64) (err error) {
 	_, _, e1 := Syscall6(SYS_FALLOCATE, uintptr(fd), uintptr(mode), uintptr(off), uintptr(off>>32), uintptr(len), uintptr(len>>32))
 	if e1 != 0 {
diff --git a/src/syscall/zsyscall_linux_ppc64.go b/src/syscall/zsyscall_linux_ppc64.go
index 2f6db68c47..b76944e96c 100644
--- a/src/syscall/zsyscall_linux_ppc64.go
+++ b/src/syscall/zsyscall_linux_ppc64.go
@@ -9,6 +9,21 @@ import "unsafe"
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func faccessat(dirfd int, path string, mode uint32) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func fchmodat(dirfd int, path string, mode uint32) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -354,21 +369,6 @@ func EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall6(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(flags), 0, 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Fallocate(fd int, mode uint32, off int64, len int64) (err error) {
 	_, _, e1 := Syscall6(SYS_FALLOCATE, uintptr(fd), uintptr(mode), uintptr(off), uintptr(len), 0, 0)
 	if e1 != 0 {
diff --git a/src/syscall/zsyscall_linux_ppc64le.go b/src/syscall/zsyscall_linux_ppc64le.go
index 44d5c5c87a..613793b0bf 100644
--- a/src/syscall/zsyscall_linux_ppc64le.go
+++ b/src/syscall/zsyscall_linux_ppc64le.go
@@ -9,6 +9,21 @@ import "unsafe"
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func faccessat(dirfd int, path string, mode uint32) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func fchmodat(dirfd int, path string, mode uint32) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -354,21 +369,6 @@ func EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall6(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(flags), 0, 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Fallocate(fd int, mode uint32, off int64, len int64) (err error) {
 	_, _, e1 := Syscall6(SYS_FALLOCATE, uintptr(fd), uintptr(mode), uintptr(off), uintptr(len), 0, 0)
 	if e1 != 0 {
diff --git a/src/syscall/zsyscall_linux_s390x.go b/src/syscall/zsyscall_linux_s390x.go
index ebad9f3080..7c63c3db58 100644
--- a/src/syscall/zsyscall_linux_s390x.go
+++ b/src/syscall/zsyscall_linux_s390x.go
@@ -9,6 +9,21 @@ import "unsafe"
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func faccessat(dirfd int, path string, mode uint32) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func fchmodat(dirfd int, path string, mode uint32) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -354,21 +369,6 @@ func EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall6(SYS_FACCESSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(flags), 0, 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Fallocate(fd int, mode uint32, off int64, len int64) (err error) {
 	_, _, e1 := Syscall6(SYS_FALLOCATE, uintptr(fd), uintptr(mode), uintptr(off), uintptr(len), 0, 0)
 	if e1 != 0 {
diff --git a/src/syscall/ztypes_linux_386.go b/src/syscall/ztypes_linux_386.go
index a73c91770f..c92dfad114 100644
--- a/src/syscall/ztypes_linux_386.go
+++ b/src/syscall/ztypes_linux_386.go
@@ -576,6 +576,7 @@ const (
 	_AT_FDCWD            = -0x64
 	_AT_REMOVEDIR        = 0x200
 	_AT_SYMLINK_NOFOLLOW = 0x100
+	_AT_EACCESS          = 0x200
 )
 
 type Termios struct {
diff --git a/src/syscall/ztypes_linux_amd64.go b/src/syscall/ztypes_linux_amd64.go
index 4cbd5d899d..623585a639 100644
--- a/src/syscall/ztypes_linux_amd64.go
+++ b/src/syscall/ztypes_linux_amd64.go
@@ -594,6 +594,7 @@ const (
 	_AT_FDCWD            = -0x64
 	_AT_REMOVEDIR        = 0x200
 	_AT_SYMLINK_NOFOLLOW = 0x100
+	_AT_EACCESS          = 0x200
 )
 
 type Termios struct {
diff --git a/src/syscall/ztypes_linux_arm.go b/src/syscall/ztypes_linux_arm.go
index 16aa014ada..0c0a94a52f 100644
--- a/src/syscall/ztypes_linux_arm.go
+++ b/src/syscall/ztypes_linux_arm.go
@@ -565,6 +565,7 @@ const (
 	_AT_FDCWD            = -0x64
 	_AT_REMOVEDIR        = 0x200
 	_AT_SYMLINK_NOFOLLOW = 0x100
+	_AT_EACCESS          = 0x200
 )
 
 type Termios struct {
diff --git a/src/syscall/ztypes_linux_arm64.go b/src/syscall/ztypes_linux_arm64.go
index e5d669cdba..ea682c4efa 100644
--- a/src/syscall/ztypes_linux_arm64.go
+++ b/src/syscall/ztypes_linux_arm64.go
@@ -572,6 +572,7 @@ const (
 	_AT_FDCWD            = -0x64
 	_AT_REMOVEDIR        = 0x200
 	_AT_SYMLINK_NOFOLLOW = 0x100
+	_AT_EACCESS          = 0x200
 )
 
 type Termios struct {
diff --git a/src/syscall/ztypes_linux_mips.go b/src/syscall/ztypes_linux_mips.go
index 7a8d34dfc2..6d42e48d60 100644
--- a/src/syscall/ztypes_linux_mips.go
+++ b/src/syscall/ztypes_linux_mips.go
@@ -571,6 +571,7 @@ const (
 	_AT_FDCWD            = -0x64
 	_AT_REMOVEDIR        = 0x200
 	_AT_SYMLINK_NOFOLLOW = 0x100
+	_AT_EACCESS          = 0x200
 )
 
 type Termios struct {
diff --git a/src/syscall/ztypes_linux_mips64.go b/src/syscall/ztypes_linux_mips64.go
index 8c5a0d1d76..397ded1f4d 100644
--- a/src/syscall/ztypes_linux_mips64.go
+++ b/src/syscall/ztypes_linux_mips64.go
@@ -577,6 +577,7 @@ const (
 	_AT_FDCWD            = -0x64
 	_AT_REMOVEDIR        = 0x200
 	_AT_SYMLINK_NOFOLLOW = 0x100
+	_AT_EACCESS          = 0x200
 )
 
 type Termios struct {
diff --git a/src/syscall/ztypes_linux_mips64le.go b/src/syscall/ztypes_linux_mips64le.go
index 8c5a0d1d76..397ded1f4d 100644
--- a/src/syscall/ztypes_linux_mips64le.go
+++ b/src/syscall/ztypes_linux_mips64le.go
@@ -577,6 +577,7 @@ const (
 	_AT_FDCWD            = -0x64
 	_AT_REMOVEDIR        = 0x200
 	_AT_SYMLINK_NOFOLLOW = 0x100
+	_AT_EACCESS          = 0x200
 )
 
 type Termios struct {
diff --git a/src/syscall/ztypes_linux_mipsle.go b/src/syscall/ztypes_linux_mipsle.go
index 7a8d34dfc2..6d42e48d60 100644
--- a/src/syscall/ztypes_linux_mipsle.go
+++ b/src/syscall/ztypes_linux_mipsle.go
@@ -571,6 +571,7 @@ const (
 	_AT_FDCWD            = -0x64
 	_AT_REMOVEDIR        = 0x200
 	_AT_SYMLINK_NOFOLLOW = 0x100
+	_AT_EACCESS          = 0x200
 )
 
 type Termios struct {
diff --git a/src/syscall/ztypes_linux_ppc64.go b/src/syscall/ztypes_linux_ppc64.go
index 087a70d443..3d295390f6 100644
--- a/src/syscall/ztypes_linux_ppc64.go
+++ b/src/syscall/ztypes_linux_ppc64.go
@@ -583,6 +583,7 @@ const (
 	_AT_FDCWD            = -0x64
 	_AT_REMOVEDIR        = 0x200
 	_AT_SYMLINK_NOFOLLOW = 0x100
+	_AT_EACCESS          = 0x200
 )
 
 type Termios struct {
diff --git a/src/syscall/ztypes_linux_ppc64le.go b/src/syscall/ztypes_linux_ppc64le.go
index 8412bddbfa..220083d9c5 100644
--- a/src/syscall/ztypes_linux_ppc64le.go
+++ b/src/syscall/ztypes_linux_ppc64le.go
@@ -583,6 +583,7 @@ const (
 	_AT_FDCWD            = -0x64
 	_AT_REMOVEDIR        = 0x200
 	_AT_SYMLINK_NOFOLLOW = 0x100
+	_AT_EACCESS          = 0x200
 )
 
 type Termios struct {
diff --git a/src/syscall/ztypes_linux_s390x.go b/src/syscall/ztypes_linux_s390x.go
index 63c4a83b19..2805966774 100644
--- a/src/syscall/ztypes_linux_s390x.go
+++ b/src/syscall/ztypes_linux_s390x.go
@@ -597,6 +597,7 @@ const (
 	_AT_FDCWD            = -0x64
 	_AT_REMOVEDIR        = 0x200
 	_AT_SYMLINK_NOFOLLOW = 0x100
+	_AT_EACCESS          = 0x200
 )
 
 type Termios struct {