syscall: add utimensat and use it for UtimesNano on BSD and Solaris

All the BSDs and Solaris support the utimensat syscall, but Darwin
doesn't. Account for that by adding the //sys lines not to
syscall_bsd.go but the individual OS's syscall_*.go files and implement
utimensat on Darwin as just returning ENOSYS, such that UtimesNano will
fall back to use utimes as it currently does unconditionally.

This also adds the previously missing utimensat syscall number for
FreeBSD and Dragonfly.

Fixes #16480

Change-Id: I367454c6168eb1f7150b988fa16cf02abff42f34
Reviewed-on: https://go-review.googlesource.com/55130
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>

43 files changed, 282 insertions, 5 deletions

diff --git a/src/syscall/syscall_bsd.go b/src/syscall/syscall_bsd.go
index 9370dd487e..1d0efe37e1 100644
--- a/src/syscall/syscall_bsd.go
+++ b/src/syscall/syscall_bsd.go
@@ -507,11 +507,13 @@ func Utimes(path string, tv []Timeval) (err error) {
 }
 
 func UtimesNano(path string, ts []Timespec) error {
-	// TODO: The BSDs can do utimensat with SYS_UTIMENSAT but it
-	// isn't supported by darwin so this uses utimes instead
 	if len(ts) != 2 {
 		return EINVAL
 	}
+	err := utimensat(_AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])))
+	if err != ENOSYS {
+		return err
+	}
 	// Not as efficient as it could be because Timespec and
 	// Timeval have different types in the different OSes
 	tv := [2]Timeval{
diff --git a/src/syscall/syscall_darwin.go b/src/syscall/syscall_darwin.go
index a1c360d4f4..4d17b157bd 100644
--- a/src/syscall/syscall_darwin.go
+++ b/src/syscall/syscall_darwin.go
@@ -186,6 +186,11 @@ func Getfsstat(buf []Statfs_t, flags int) (n int, err error) {
 	return
 }
 
+func utimensat(dirfd int, path string, times *[2]Timespec) error {
+	// Darwin doesn't support SYS_UTIMENSAT
+	return ENOSYS
+}
+
 /*
  * Wrapped
  */
diff --git a/src/syscall/syscall_dragonfly.go b/src/syscall/syscall_dragonfly.go
index 7d4fa4dd5c..27f1f585be 100644
--- a/src/syscall/syscall_dragonfly.go
+++ b/src/syscall/syscall_dragonfly.go
@@ -211,6 +211,7 @@ func Getfsstat(buf []Statfs_t, flags int) (n int, err error) {
 //sys	readlen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_READ
 //sys	writelen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_WRITE
 //sys	accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int, err error)
+//sys	utimensat(dirfd int, path string, times *[2]Timespec) (err error)
 
 /*
  * Unimplemented
diff --git a/src/syscall/syscall_freebsd.go b/src/syscall/syscall_freebsd.go
index 64c881ad8e..ee90e87399 100644
--- a/src/syscall/syscall_freebsd.go
+++ b/src/syscall/syscall_freebsd.go
@@ -222,6 +222,7 @@ func Getfsstat(buf []Statfs_t, flags int) (n int, err error) {
 //sys	readlen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_READ
 //sys	writelen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_WRITE
 //sys	accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int, err error)
+//sys	utimensat(dirfd int, path string, times *[2]Timespec) (err error)
 
 /*
  * Unimplemented
diff --git a/src/syscall/syscall_netbsd.go b/src/syscall/syscall_netbsd.go
index f2e169446f..da80f2b9d6 100644
--- a/src/syscall/syscall_netbsd.go
+++ b/src/syscall/syscall_netbsd.go
@@ -202,6 +202,7 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e
 //sys	munmap(addr uintptr, length uintptr) (err error)
 //sys	readlen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_READ
 //sys	writelen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_WRITE
+//sys	utimensat(dirfd int, path string, times *[2]Timespec) (err error)
 
 /*
  * Unimplemented
diff --git a/src/syscall/syscall_openbsd.go b/src/syscall/syscall_openbsd.go
index bd25fbf87a..f904f37017 100644
--- a/src/syscall/syscall_openbsd.go
+++ b/src/syscall/syscall_openbsd.go
@@ -183,6 +183,7 @@ func Getfsstat(buf []Statfs_t, flags int) (n int, err error) {
 //sys	munmap(addr uintptr, length uintptr) (err error)
 //sys	readlen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_READ
 //sys	writelen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_WRITE
+//sys	utimensat(dirfd int, path string, times *[2]Timespec) (err error)
 
 /*
  * Unimplemented
@@ -278,6 +279,5 @@ func Getfsstat(buf []Statfs_t, flags int) (n int, err error) {
 // thrsleep
 // thrwakeup
 // unlinkat
-// utimensat
 // vfork
 // writev
diff --git a/src/syscall/syscall_solaris.go b/src/syscall/syscall_solaris.go
index 636de924cc..9555bf8bc8 100644
--- a/src/syscall/syscall_solaris.go
+++ b/src/syscall/syscall_solaris.go
@@ -510,6 +510,7 @@ func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error)
 //sys	recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error) = libsocket.recvfrom
 //sys	recvmsg(s int, msg *Msghdr, flags int) (n int, err error) = libsocket.__xnet_recvmsg
 //sys	getexecname() (path unsafe.Pointer, err error) = libc.getexecname
+//sys	utimensat(dirfd int, path string, times *[2]Timespec) (err error)
 
 func Getexecname() (path string, err error) {
 	ptr, err := getexecname()
diff --git a/src/syscall/types_darwin.go b/src/syscall/types_darwin.go
index a043071f26..d8218d6aea 100644
--- a/src/syscall/types_darwin.go
+++ b/src/syscall/types_darwin.go
@@ -238,6 +238,12 @@ type BpfInsn C.struct_bpf_insn
 
 type BpfHdr C.struct_bpf_hdr
 
+// Misc
+
+const (
+	_AT_FDCWD = C.AT_FDCWD
+)
+
 // Terminal handling
 
 type Termios C.struct_termios
diff --git a/src/syscall/types_dragonfly.go b/src/syscall/types_dragonfly.go
index fb7fd1bb4f..5728d6762f 100644
--- a/src/syscall/types_dragonfly.go
+++ b/src/syscall/types_dragonfly.go
@@ -237,6 +237,12 @@ type BpfInsn C.struct_bpf_insn
 
 type BpfHdr C.struct_bpf_hdr
 
+// Misc
+
+const (
+	_AT_FDCWD = C.AT_FDCWD
+)
+
 // Terminal handling
 
 type Termios C.struct_termios
diff --git a/src/syscall/types_freebsd.go b/src/syscall/types_freebsd.go
index 68a69312b2..6f8670a429 100644
--- a/src/syscall/types_freebsd.go
+++ b/src/syscall/types_freebsd.go
@@ -337,6 +337,12 @@ type BpfHdr C.struct_bpf_hdr
 
 type BpfZbufHeader C.struct_bpf_zbuf_header
 
+// Misc
+
+const (
+	_AT_FDCWD = C.AT_FDCWD
+)
+
 // Terminal handling
 
 type Termios C.struct_termios
diff --git a/src/syscall/types_netbsd.go b/src/syscall/types_netbsd.go
index 04354a32a9..37c5fa9834 100644
--- a/src/syscall/types_netbsd.go
+++ b/src/syscall/types_netbsd.go
@@ -223,6 +223,12 @@ type BpfHdr C.struct_bpf_hdr
 
 type BpfTimeval C.struct_bpf_timeval
 
+// Misc
+
+const (
+	_AT_FDCWD = C.AT_FDCWD
+)
+
 // Terminal handling
 
 type Termios C.struct_termios
diff --git a/src/syscall/types_openbsd.go b/src/syscall/types_openbsd.go
index e6d1ea7044..29d6feb006 100644
--- a/src/syscall/types_openbsd.go
+++ b/src/syscall/types_openbsd.go
@@ -239,6 +239,12 @@ type BpfHdr C.struct_bpf_hdr
 
 type BpfTimeval C.struct_bpf_timeval
 
+// Misc
+
+const (
+	_AT_FDCWD = C.AT_FDCWD
+)
+
 // Terminal handling
 
 type Termios C.struct_termios
diff --git a/src/syscall/types_solaris.go b/src/syscall/types_solaris.go
index 7246434223..a219a437d5 100644
--- a/src/syscall/types_solaris.go
+++ b/src/syscall/types_solaris.go
@@ -224,6 +224,12 @@ type BpfTimeval C.struct_bpf_timeval
 
 type BpfHdr C.struct_bpf_hdr
 
+// Misc
+
+const (
+	_AT_FDCWD = C.AT_FDCWD
+)
+
 // Terminal handling
 
 type Termios C.struct_termios
diff --git a/src/syscall/zsyscall_dragonfly_amd64.go b/src/syscall/zsyscall_dragonfly_amd64.go
index 7a21510407..28bc679c4c 100644
--- a/src/syscall/zsyscall_dragonfly_amd64.go
+++ b/src/syscall/zsyscall_dragonfly_amd64.go
@@ -1298,3 +1298,18 @@ func accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int
 	}
 	return
 }
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func utimensat(dirfd int, path string, times *[2]Timespec) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_UTIMENSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(times)))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
diff --git a/src/syscall/zsyscall_freebsd_386.go b/src/syscall/zsyscall_freebsd_386.go
index 63061b2794..55fead990a 100644
--- a/src/syscall/zsyscall_freebsd_386.go
+++ b/src/syscall/zsyscall_freebsd_386.go
@@ -1308,3 +1308,18 @@ func accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int
 	}
 	return
 }
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func utimensat(dirfd int, path string, times *[2]Timespec) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_UTIMENSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(times)))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
diff --git a/src/syscall/zsyscall_freebsd_amd64.go b/src/syscall/zsyscall_freebsd_amd64.go
index 8120980332..edc29f32f8 100644
--- a/src/syscall/zsyscall_freebsd_amd64.go
+++ b/src/syscall/zsyscall_freebsd_amd64.go
@@ -1308,3 +1308,18 @@ func accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int
 	}
 	return
 }
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func utimensat(dirfd int, path string, times *[2]Timespec) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_UTIMENSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(times)))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
diff --git a/src/syscall/zsyscall_freebsd_arm.go b/src/syscall/zsyscall_freebsd_arm.go
index f6c44c793d..80f520ef48 100644
--- a/src/syscall/zsyscall_freebsd_arm.go
+++ b/src/syscall/zsyscall_freebsd_arm.go
@@ -1308,3 +1308,18 @@ func accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int
 	}
 	return
 }
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func utimensat(dirfd int, path string, times *[2]Timespec) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_UTIMENSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(times)))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
diff --git a/src/syscall/zsyscall_netbsd_386.go b/src/syscall/zsyscall_netbsd_386.go
index ec32d9c616..272a44c7d0 100644
--- a/src/syscall/zsyscall_netbsd_386.go
+++ b/src/syscall/zsyscall_netbsd_386.go
@@ -1224,3 +1224,18 @@ func writelen(fd int, buf *byte, nbuf int) (n int, err error) {
 	}
 	return
 }
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func utimensat(dirfd int, path string, times *[2]Timespec) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_UTIMENSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(times)))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
diff --git a/src/syscall/zsyscall_netbsd_amd64.go b/src/syscall/zsyscall_netbsd_amd64.go
index 8845202687..4e22cdf769 100644
--- a/src/syscall/zsyscall_netbsd_amd64.go
+++ b/src/syscall/zsyscall_netbsd_amd64.go
@@ -1224,3 +1224,18 @@ func writelen(fd int, buf *byte, nbuf int) (n int, err error) {
 	}
 	return
 }
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func utimensat(dirfd int, path string, times *[2]Timespec) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_UTIMENSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(times)))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
diff --git a/src/syscall/zsyscall_netbsd_arm.go b/src/syscall/zsyscall_netbsd_arm.go
index 70df9b4376..d9d71aa952 100644
--- a/src/syscall/zsyscall_netbsd_arm.go
+++ b/src/syscall/zsyscall_netbsd_arm.go
@@ -1,4 +1,4 @@
-// mksyscall.pl -l32 -arm -tags netbsd,arm syscall_bsd.go syscall_netbsd.go syscall_netbsd_arm.go
+// mksyscall.pl -l32 -netbsd -arm -tags netbsd,arm syscall_bsd.go syscall_netbsd.go syscall_netbsd_arm.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
 // +build netbsd,arm
@@ -1224,3 +1224,18 @@ func writelen(fd int, buf *byte, nbuf int) (n int, err error) {
 	}
 	return
 }
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func utimensat(dirfd int, path string, times *[2]Timespec) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_UTIMENSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(times)))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
diff --git a/src/syscall/zsyscall_openbsd_386.go b/src/syscall/zsyscall_openbsd_386.go
index 2a5542fbc1..a31b81491f 100644
--- a/src/syscall/zsyscall_openbsd_386.go
+++ b/src/syscall/zsyscall_openbsd_386.go
@@ -1262,3 +1262,18 @@ func writelen(fd int, buf *byte, nbuf int) (n int, err error) {
 	}
 	return
 }
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func utimensat(dirfd int, path string, times *[2]Timespec) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_UTIMENSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(times)))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
diff --git a/src/syscall/zsyscall_openbsd_amd64.go b/src/syscall/zsyscall_openbsd_amd64.go
index 9c6a39db52..88e6cca794 100644
--- a/src/syscall/zsyscall_openbsd_amd64.go
+++ b/src/syscall/zsyscall_openbsd_amd64.go
@@ -1262,3 +1262,18 @@ func writelen(fd int, buf *byte, nbuf int) (n int, err error) {
 	}
 	return
 }
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func utimensat(dirfd int, path string, times *[2]Timespec) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_UTIMENSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(times)))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
diff --git a/src/syscall/zsyscall_openbsd_arm.go b/src/syscall/zsyscall_openbsd_arm.go
index 1ddd238368..9e910911c7 100644
--- a/src/syscall/zsyscall_openbsd_arm.go
+++ b/src/syscall/zsyscall_openbsd_arm.go
@@ -1262,3 +1262,18 @@ func writelen(fd int, buf *byte, nbuf int) (n int, err error) {
 	}
 	return
 }
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func utimensat(dirfd int, path string, times *[2]Timespec) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_UTIMENSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(times)))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
diff --git a/src/syscall/zsyscall_solaris_amd64.go b/src/syscall/zsyscall_solaris_amd64.go
index fbc815db30..9dbec9ce35 100644
--- a/src/syscall/zsyscall_solaris_amd64.go
+++ b/src/syscall/zsyscall_solaris_amd64.go
@@ -90,6 +90,7 @@ import "unsafe"
 //go:cgo_import_dynamic libc_recvfrom recvfrom "libsocket.so"
 //go:cgo_import_dynamic libc___xnet_recvmsg __xnet_recvmsg "libsocket.so"
 //go:cgo_import_dynamic libc_getexecname getexecname "libc.so"
+//go:cgo_import_dynamic libc_utimensat utimensat "libc.so"
 
 //go:linkname libc_Getcwd libc_Getcwd
 //go:linkname libc_getgroups libc_getgroups
@@ -174,6 +175,7 @@ import "unsafe"
 //go:linkname libc_recvfrom libc_recvfrom
 //go:linkname libc___xnet_recvmsg libc___xnet_recvmsg
 //go:linkname libc_getexecname libc_getexecname
+//go:linkname libc_utimensat libc_utimensat
 
 type libcFunc uintptr
 
@@ -260,7 +262,8 @@ var (
 	libc_setsockopt,
 	libc_recvfrom,
 	libc___xnet_recvmsg,
-	libc_getexecname libcFunc
+	libc_getexecname,
+	libc_utimensat libcFunc
 )
 
 func Getcwd(buf []byte) (n int, err error) {
@@ -1084,3 +1087,16 @@ func getexecname() (path unsafe.Pointer, err error) {
 	}
 	return
 }
+
+func utimensat(dirfd int, path string, times *[2]Timespec) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := sysvicall6(uintptr(unsafe.Pointer(&libc_utimensat)), 3, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(times)), 0, 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
diff --git a/src/syscall/zsysnum_dragonfly_amd64.go b/src/syscall/zsysnum_dragonfly_amd64.go
index 3c2e342970..bc535f26bf 100644
--- a/src/syscall/zsysnum_dragonfly_amd64.go
+++ b/src/syscall/zsysnum_dragonfly_amd64.go
@@ -301,5 +301,6 @@ const (
 	SYS_LPATHCONF              = 533 // { int lpathconf(char *path, int name); }
 	SYS_VMM_GUEST_CTL          = 534 // { int vmm_guest_ctl(int op, struct vmm_guest_options *options); }
 	SYS_VMM_GUEST_SYNC_ADDR    = 535 // { int vmm_guest_sync_addr(long *dstaddr, long *srcaddr); }
+	SYS_UTIMENSAT              = 539 // { int utimensat(int fd, const char *path, const struct timespec *ts, int flags); }
 	SYS_ACCEPT4                = 541 // { int accept4(int s, caddr_t name, int *anamelen, int flags); }
 )
diff --git a/src/syscall/zsysnum_freebsd_386.go b/src/syscall/zsysnum_freebsd_386.go
index 5e47217957..d0e403acea 100644
--- a/src/syscall/zsysnum_freebsd_386.go
+++ b/src/syscall/zsysnum_freebsd_386.go
@@ -347,4 +347,5 @@ const (
 	SYS_ACCEPT4                  = 541 // { int accept4(int s, \
 	SYS_PIPE2                    = 542 // { int pipe2(int *fildes, int flags); }
 	SYS_PROCCTL                  = 544 // { int procctl(idtype_t idtype, id_t id, \
+	SYS_UTIMENSAT                = 547 // { int utimensat(int fd, \
 )
diff --git a/src/syscall/zsysnum_freebsd_amd64.go b/src/syscall/zsysnum_freebsd_amd64.go
index df8928cc68..2fa4d211d3 100644
--- a/src/syscall/zsysnum_freebsd_amd64.go
+++ b/src/syscall/zsysnum_freebsd_amd64.go
@@ -347,4 +347,5 @@ const (
 	SYS_ACCEPT4                  = 541 // { int accept4(int s, \
 	SYS_PIPE2                    = 542 // { int pipe2(int *fildes, int flags); }
 	SYS_PROCCTL                  = 544 // { int procctl(idtype_t idtype, id_t id, \
+	SYS_UTIMENSAT                = 547 // { int utimensat(int fd, \
 )
diff --git a/src/syscall/zsysnum_freebsd_arm.go b/src/syscall/zsysnum_freebsd_arm.go
index f670a59179..d2caa8f2ad 100644
--- a/src/syscall/zsysnum_freebsd_arm.go
+++ b/src/syscall/zsysnum_freebsd_arm.go
@@ -347,4 +347,5 @@ const (
 	SYS_ACCEPT4                  = 541 // { int accept4(int s, \
 	SYS_PIPE2                    = 542 // { int pipe2(int *fildes, int flags); }
 	SYS_PROCCTL                  = 544 // { int procctl(idtype_t idtype, id_t id, \
+	SYS_UTIMENSAT                = 547 // { int utimensat(int fd, \
 )
diff --git a/src/syscall/ztypes_darwin_386.go b/src/syscall/ztypes_darwin_386.go
index 7298d0243d..e2cf12f17e 100644
--- a/src/syscall/ztypes_darwin_386.go
+++ b/src/syscall/ztypes_darwin_386.go
@@ -437,6 +437,10 @@ type BpfHdr struct {
 	Pad_cgo_0 [2]byte
 }
 
+const (
+	_AT_FDCWD = -0x2
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32
diff --git a/src/syscall/ztypes_darwin_amd64.go b/src/syscall/ztypes_darwin_amd64.go
index ec95d51f91..bbd5bec385 100644
--- a/src/syscall/ztypes_darwin_amd64.go
+++ b/src/syscall/ztypes_darwin_amd64.go
@@ -446,6 +446,10 @@ type BpfHdr struct {
 	Pad_cgo_0 [2]byte
 }
 
+const (
+	_AT_FDCWD = -0x2
+)
+
 type Termios struct {
 	Iflag     uint64
 	Oflag     uint64
diff --git a/src/syscall/ztypes_darwin_arm.go b/src/syscall/ztypes_darwin_arm.go
index 91c4470e7c..ca774793eb 100644
--- a/src/syscall/ztypes_darwin_arm.go
+++ b/src/syscall/ztypes_darwin_arm.go
@@ -438,6 +438,10 @@ type BpfHdr struct {
 	Pad_cgo_0 [2]byte
 }
 
+const (
+	_AT_FDCWD = -0x2
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32
diff --git a/src/syscall/ztypes_darwin_arm64.go b/src/syscall/ztypes_darwin_arm64.go
index 1d65cfde9d..e9c8549fa1 100644
--- a/src/syscall/ztypes_darwin_arm64.go
+++ b/src/syscall/ztypes_darwin_arm64.go
@@ -446,6 +446,10 @@ type BpfHdr struct {
 	Pad_cgo_0 [2]byte
 }
 
+const (
+	_AT_FDCWD = -0x2
+)
+
 type Termios struct {
 	Iflag     uint64
 	Oflag     uint64
diff --git a/src/syscall/ztypes_dragonfly_amd64.go b/src/syscall/ztypes_dragonfly_amd64.go
index 00120d0a27..0be4a53ebe 100644
--- a/src/syscall/ztypes_dragonfly_amd64.go
+++ b/src/syscall/ztypes_dragonfly_amd64.go
@@ -432,6 +432,10 @@ type BpfHdr struct {
 	Pad_cgo_0 [6]byte
 }
 
+const (
+	_AT_FDCWD = -0x64
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32
diff --git a/src/syscall/ztypes_freebsd_386.go b/src/syscall/ztypes_freebsd_386.go
index d972fb6bdf..c23bacfe32 100644
--- a/src/syscall/ztypes_freebsd_386.go
+++ b/src/syscall/ztypes_freebsd_386.go
@@ -483,6 +483,10 @@ type BpfZbufHeader struct {
 	X_bzh_pad  [5]uint32
 }
 
+const (
+	_AT_FDCWD = -0x64
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32
diff --git a/src/syscall/ztypes_freebsd_amd64.go b/src/syscall/ztypes_freebsd_amd64.go
index 0a5a10bf7d..1e5822f66a 100644
--- a/src/syscall/ztypes_freebsd_amd64.go
+++ b/src/syscall/ztypes_freebsd_amd64.go
@@ -486,6 +486,10 @@ type BpfZbufHeader struct {
 	X_bzh_pad  [5]uint32
 }
 
+const (
+	_AT_FDCWD = -0x64
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32
diff --git a/src/syscall/ztypes_freebsd_arm.go b/src/syscall/ztypes_freebsd_arm.go
index 5d7acd547b..f65a92916c 100644
--- a/src/syscall/ztypes_freebsd_arm.go
+++ b/src/syscall/ztypes_freebsd_arm.go
@@ -486,6 +486,10 @@ type BpfZbufHeader struct {
 	X_bzh_pad  [5]uint32
 }
 
+const (
+	_AT_FDCWD = -0x64
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32
diff --git a/src/syscall/ztypes_netbsd_386.go b/src/syscall/ztypes_netbsd_386.go
index 1752c6c229..c8afb98ea1 100644
--- a/src/syscall/ztypes_netbsd_386.go
+++ b/src/syscall/ztypes_netbsd_386.go
@@ -372,6 +372,10 @@ type BpfTimeval struct {
 	Usec int32
 }
 
+const (
+	_AT_FDCWD = -0x64
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32
diff --git a/src/syscall/ztypes_netbsd_amd64.go b/src/syscall/ztypes_netbsd_amd64.go
index b8d4b0b02a..9336fc107a 100644
--- a/src/syscall/ztypes_netbsd_amd64.go
+++ b/src/syscall/ztypes_netbsd_amd64.go
@@ -379,6 +379,10 @@ type BpfTimeval struct {
 	Usec int64
 }
 
+const (
+	_AT_FDCWD = -0x64
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32
diff --git a/src/syscall/ztypes_netbsd_arm.go b/src/syscall/ztypes_netbsd_arm.go
index c21d875a93..0e4fe4a812 100644
--- a/src/syscall/ztypes_netbsd_arm.go
+++ b/src/syscall/ztypes_netbsd_arm.go
@@ -377,6 +377,10 @@ type BpfTimeval struct {
 	Usec int32
 }
 
+const (
+	_AT_FDCWD = -0x64
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32
diff --git a/src/syscall/ztypes_openbsd_386.go b/src/syscall/ztypes_openbsd_386.go
index 0376d3acab..05e79d85a4 100644
--- a/src/syscall/ztypes_openbsd_386.go
+++ b/src/syscall/ztypes_openbsd_386.go
@@ -430,6 +430,10 @@ type BpfTimeval struct {
 	Usec uint32
 }
 
+const (
+	_AT_FDCWD = -0x64
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32
diff --git a/src/syscall/ztypes_openbsd_amd64.go b/src/syscall/ztypes_openbsd_amd64.go
index bf23626ff2..8bd169c510 100644
--- a/src/syscall/ztypes_openbsd_amd64.go
+++ b/src/syscall/ztypes_openbsd_amd64.go
@@ -437,6 +437,10 @@ type BpfTimeval struct {
 	Usec uint32
 }
 
+const (
+	_AT_FDCWD = -0x64
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32
diff --git a/src/syscall/ztypes_openbsd_arm.go b/src/syscall/ztypes_openbsd_arm.go
index e1d8938f0e..0c30259f49 100644
--- a/src/syscall/ztypes_openbsd_arm.go
+++ b/src/syscall/ztypes_openbsd_arm.go
@@ -423,6 +423,10 @@ type BpfTimeval struct {
 	Usec uint32
 }
 
+const (
+	_AT_FDCWD = -0x64
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32
diff --git a/src/syscall/ztypes_solaris_amd64.go b/src/syscall/ztypes_solaris_amd64.go
index 4cf07ed496..12307abfaa 100644
--- a/src/syscall/ztypes_solaris_amd64.go
+++ b/src/syscall/ztypes_solaris_amd64.go
@@ -358,6 +358,10 @@ type BpfHdr struct {
 	Pad_cgo_0 [2]byte
 }
 
+const (
+	_AT_FDCWD = 0xffd19553
+)
+
 type Termios struct {
 	Iflag     uint32
 	Oflag     uint32