unix: add *at functions (POSIX.1-2008) on Darwin

Add the Faccessat, Fchownat, Linkat, Mkdirat, Openat, Readlinkat,
Renameat, Symlinkat and Unlinkat functions (to conform to POSIX.1-2008)
and make Fchmodat available on all architectures, not just amd64. Also
add the missing AT_* constants.

Generated on Mac OS 10.11 (Darwin 15.6.0) for darwin/amd64 and
darwin/386 only.

Fixes golang/go#14458

Change-Id: I6d9258864383ea77f9cad058ee8ba2c728213b40
Reviewed-on: https://go-review.googlesource.com/50450Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

unix/syscall_darwin.go

@@ -210,10 +210,13 @@ func Kill(pid int, signum syscall.Signal) (err error) { return kill(pid, int(sig
 //sys	Dup2(from int, to int) (err error)
 //sys	Exchangedata(path1 string, path2 string, options int) (err error)
 //sys	Exit(code int)
+//sys	Faccessat(dirfd int, path string, mode uint32, flags int) (err error)
 //sys	Fchdir(fd int) (err error)
 //sys	Fchflags(fd int, flags int) (err error)
 //sys	Fchmod(fd int, mode uint32) (err error)
+//sys	Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)
 //sys	Fchown(fd int, uid int, gid int) (err error)
+//sys	Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error)
 //sys	Flock(fd int, how int) (err error)
 //sys	Fpathconf(fd int, name int) (val int, err error)
 //sys	Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64
@@ -238,9 +241,11 @@ func Kill(pid int, signum syscall.Signal) (err error) { return kill(pid, int(sig
 //sys	Kqueue() (fd int, err error)
 //sys	Lchown(path string, uid int, gid int) (err error)
 //sys	Link(path string, link string) (err error)
+//sys	Linkat(pathfd int, path string, linkfd int, link string, flags int) (err error)
 //sys	Listen(s int, backlog int) (err error)
 //sys	Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64
 //sys	Mkdir(path string, mode uint32) (err error)
+//sys	Mkdirat(dirfd int, path string, mode uint32) (err error)
 //sys	Mkfifo(path string, mode uint32) (err error)
 //sys	Mknod(path string, mode uint32, dev int) (err error)
 //sys	Mlock(b []byte) (err error)
@@ -249,12 +254,15 @@ func Kill(pid int, signum syscall.Signal) (err error) { return kill(pid, int(sig
 //sys	Munlock(b []byte) (err error)
 //sys	Munlockall() (err error)
 //sys	Open(path string, mode int, perm uint32) (fd int, err error)
+//sys	Openat(dirfd int, path string, mode int, perm uint32) (fd int, err error)
 //sys	Pathconf(path string, name int) (val int, err error)
 //sys	Pread(fd int, p []byte, offset int64) (n int, err error)
 //sys	Pwrite(fd int, p []byte, offset int64) (n int, err error)
 //sys	read(fd int, p []byte) (n int, err error)
 //sys	Readlink(path string, buf []byte) (n int, err error)
+//sys	Readlinkat(dirfd int, path string, buf []byte) (n int, err error)
 //sys	Rename(from string, to string) (err error)
+//sys	Renameat(fromfd int, from string, tofd int, to string) (err error)
 //sys	Revoke(path string) (err error)
 //sys	Rmdir(path string) (err error)
 //sys	Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_LSEEK
@@ -275,11 +283,13 @@ func Kill(pid int, signum syscall.Signal) (err error) { return kill(pid, int(sig
 //sys	Stat(path string, stat *Stat_t) (err error) = SYS_STAT64
 //sys	Statfs(path string, stat *Statfs_t) (err error) = SYS_STATFS64
 //sys	Symlink(path string, link string) (err error)
+//sys	Symlinkat(oldpath string, newdirfd int, newpath string) (err error)
 //sys	Sync() (err error)
 //sys	Truncate(path string, length int64) (err error)
 //sys	Umask(newmask int) (oldmask int)
 //sys	Undelete(path string) (err error)
 //sys	Unlink(path string) (err error)
+//sys	Unlinkat(dirfd int, path string, flags int) (err error)
 //sys	Unmount(path string, flags int) (err error)
 //sys	write(fd int, p []byte) (n int, err error)
 //sys   mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error)

unix/syscall_darwin_amd64.go

@@ -11,8 +11,6 @@ import (
 	"unsafe"
 )
 
-//sys	Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)
-
 func Getpagesize() int { return 4096 }
 
 func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) }

unix/types_darwin.go

@@ -246,5 +246,7 @@ type Termios C.struct_termios
 
 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
 )

unix/zerrors_darwin_386.go

 // mkerrors.sh -m32
-// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+// Code generated by the command above; see README.md. DO NOT EDIT.
 
 // +build 386,darwin
 
@@ -48,6 +48,7 @@ const (
 	AF_UNIX                           = 0x1
 	AF_UNSPEC                         = 0x0
 	AF_UTUN                           = 0x26
+	ALTWERASE                         = 0x200
 	B0                                = 0x0
 	B110                              = 0x6e
 	B115200                           = 0x1c200
@@ -138,9 +139,26 @@ const (
 	BPF_W                             = 0x0
 	BPF_X                             = 0x8
 	BRKINT                            = 0x2
+	BS0                               = 0x0
+	BS1                               = 0x8000
+	BSDLY                             = 0x8000
 	CFLUSH                            = 0xf
 	CLOCAL                            = 0x8000
+	CLOCK_MONOTONIC                   = 0x6
+	CLOCK_MONOTONIC_RAW               = 0x4
+	CLOCK_MONOTONIC_RAW_APPROX        = 0x5
+	CLOCK_PROCESS_CPUTIME_ID          = 0xc
+	CLOCK_REALTIME                    = 0x0
+	CLOCK_THREAD_CPUTIME_ID           = 0x10
+	CLOCK_UPTIME_RAW                  = 0x8
+	CLOCK_UPTIME_RAW_APPROX           = 0x9
+	CR0                               = 0x0
+	CR1                               = 0x1000
+	CR2                               = 0x2000
+	CR3                               = 0x3000
+	CRDLY                             = 0x3000
 	CREAD                             = 0x800
+	CRTSCTS                           = 0x30000
 	CS5                               = 0x0
 	CS6                               = 0x100
 	CS7                               = 0x200
@@ -332,13 +350,14 @@ const (
 	ECHONL                            = 0x10
 	ECHOPRT                           = 0x20
 	EVFILT_AIO                        = -0x3
+	EVFILT_EXCEPT                     = -0xf
 	EVFILT_FS                         = -0x9
 	EVFILT_MACHPORT                   = -0x8
 	EVFILT_PROC                       = -0x5
 	EVFILT_READ                       = -0x1
 	EVFILT_SIGNAL                     = -0x6
-	EVFILT_SYSCOUNT                   = 0xe
-	EVFILT_THREADMARKER               = 0xe
+	EVFILT_SYSCOUNT                   = 0xf
+	EVFILT_THREADMARKER               = 0xf
 	EVFILT_TIMER                      = -0x7
 	EVFILT_USER                       = -0xa
 	EVFILT_VM                         = -0xc
@@ -349,6 +368,7 @@ const (
 	EV_DELETE                         = 0x2
 	EV_DISABLE                        = 0x8
 	EV_DISPATCH                       = 0x80
+	EV_DISPATCH2                      = 0x180
 	EV_ENABLE                         = 0x4
 	EV_EOF                            = 0x8000
 	EV_ERROR                          = 0x4000
@@ -359,16 +379,25 @@ const (
 	EV_POLL                           = 0x1000
 	EV_RECEIPT                        = 0x40
 	EV_SYSFLAGS                       = 0xf000
+	EV_UDATA_SPECIFIC                 = 0x100
+	EV_VANISHED                       = 0x200
 	EXTA                              = 0x4b00
 	EXTB                              = 0x9600
 	EXTPROC                           = 0x800
 	FD_CLOEXEC                        = 0x1
 	FD_SETSIZE                        = 0x400
+	FF0                               = 0x0
+	FF1                               = 0x4000
+	FFDLY                             = 0x4000
 	FLUSHO                            = 0x800000
 	F_ADDFILESIGS                     = 0x3d
+	F_ADDFILESIGS_FOR_DYLD_SIM        = 0x53
+	F_ADDFILESIGS_RETURN              = 0x61
 	F_ADDSIGS                         = 0x3b
 	F_ALLOCATEALL                     = 0x4
 	F_ALLOCATECONTIG                  = 0x2
+	F_BARRIERFSYNC                    = 0x55
+	F_CHECK_LV                        = 0x62
 	F_CHKCLEAN                        = 0x29
 	F_DUPFD                           = 0x0
 	F_DUPFD_CLOEXEC                   = 0x43
@@ -770,11 +799,13 @@ const (
 	MADV_FREE_REUSABLE                = 0x7
 	MADV_FREE_REUSE                   = 0x8
 	MADV_NORMAL                       = 0x0
+	MADV_PAGEOUT                      = 0xa
 	MADV_RANDOM                       = 0x1
 	MADV_SEQUENTIAL                   = 0x2
 	MADV_WILLNEED                     = 0x3
 	MADV_ZERO_WIRED_PAGES             = 0x6
 	MAP_ANON                          = 0x1000
+	MAP_ANONYMOUS                     = 0x1000
 	MAP_COPY                          = 0x2
 	MAP_FILE                          = 0x0
 	MAP_FIXED                         = 0x10
@@ -786,6 +817,8 @@ const (
 	MAP_PRIVATE                       = 0x2
 	MAP_RENAME                        = 0x20
 	MAP_RESERVED0080                  = 0x80
+	MAP_RESILIENT_CODESIGN            = 0x2000
+	MAP_RESILIENT_MEDIA               = 0x4000
 	MAP_SHARED                        = 0x1
 	MCL_CURRENT                       = 0x1
 	MCL_FUTURE                        = 0x2
@@ -819,7 +852,13 @@ const (
 	NET_RT_MAXID                      = 0xa
 	NET_RT_STAT                       = 0x4
 	NET_RT_TRASH                      = 0x5
+	NL0                               = 0x0
+	NL1                               = 0x100
+	NL2                               = 0x200
+	NL3                               = 0x300
+	NLDLY                             = 0x300
 	NOFLSH                            = 0x80000000
+	NOKERNINFO                        = 0x2000000
 	NOTE_ABSOLUTE                     = 0x8
 	NOTE_ATTRIB                       = 0x8
 	NOTE_BACKGROUND                   = 0x40
@@ -843,11 +882,14 @@ const (
 	NOTE_FFNOP                        = 0x0
 	NOTE_FFOR                         = 0x80000000
 	NOTE_FORK                         = 0x40000000
+	NOTE_FUNLOCK                      = 0x100
 	NOTE_LEEWAY                       = 0x10
 	NOTE_LINK                         = 0x10
 	NOTE_LOWAT                        = 0x1
+	NOTE_MACH_CONTINUOUS_TIME         = 0x80
 	NOTE_NONE                         = 0x80
 	NOTE_NSECONDS                     = 0x4
+	NOTE_OOB                          = 0x2
 	NOTE_PCTRLMASK                    = -0x100000
 	NOTE_PDATAMASK                    = 0xfffff
 	NOTE_REAP                         = 0x10000000
@@ -872,6 +914,7 @@ const (
 	ONOCR                             = 0x20
 	ONOEOT                            = 0x8
 	OPOST                             = 0x1
+	OXTABS                            = 0x4
 	O_ACCMODE                         = 0x3
 	O_ALERT                           = 0x20000000
 	O_APPEND                          = 0x8
@@ -880,6 +923,7 @@ const (
 	O_CREAT                           = 0x200
 	O_DIRECTORY                       = 0x100000
 	O_DP_GETRAWENCRYPTED              = 0x1
+	O_DP_GETRAWUNENCRYPTED            = 0x2
 	O_DSYNC                           = 0x400000
 	O_EVTONLY                         = 0x8000
 	O_EXCL                            = 0x800
@@ -932,7 +976,10 @@ const (
 	RLIMIT_CPU_USAGE_MONITOR          = 0x2
 	RLIMIT_DATA                       = 0x2
 	RLIMIT_FSIZE                      = 0x1
+	RLIMIT_MEMLOCK                    = 0x6
 	RLIMIT_NOFILE                     = 0x8
+	RLIMIT_NPROC                      = 0x7
+	RLIMIT_RSS                        = 0x5
 	RLIMIT_STACK                      = 0x3
 	RLIM_INFINITY                     = 0x7fffffffffffffff
 	RTAX_AUTHOR                       = 0x6
@@ -1102,6 +1149,8 @@ const (
 	SO_LABEL                          = 0x1010
 	SO_LINGER                         = 0x80
 	SO_LINGER_SEC                     = 0x1080
+	SO_NETSVC_MARKING_LEVEL           = 0x1119
+	SO_NET_SERVICE_TYPE               = 0x1116
 	SO_NKE                            = 0x1021
 	SO_NOADDRERR                      = 0x1023
 	SO_NOSIGPIPE                      = 0x1022
@@ -1157,11 +1206,22 @@ const (
 	S_IXGRP                           = 0x8
 	S_IXOTH                           = 0x1
 	S_IXUSR                           = 0x40
+	TAB0                              = 0x0
+	TAB1                              = 0x400
+	TAB2                              = 0x800
+	TAB3                              = 0x4
+	TABDLY                            = 0xc04
 	TCIFLUSH                          = 0x1
+	TCIOFF                            = 0x3
 	TCIOFLUSH                         = 0x3
+	TCION                             = 0x4
 	TCOFLUSH                          = 0x2
+	TCOOFF                            = 0x1
+	TCOON                             = 0x2
 	TCP_CONNECTIONTIMEOUT             = 0x20
+	TCP_CONNECTION_INFO               = 0x106
 	TCP_ENABLE_ECN                    = 0x104
+	TCP_FASTOPEN                      = 0x105
 	TCP_KEEPALIVE                     = 0x10
 	TCP_KEEPCNT                       = 0x102
 	TCP_KEEPINTVL                     = 0x101
@@ -1261,6 +1321,11 @@ const (
 	VKILL                             = 0x5
 	VLNEXT                            = 0xe
 	VMIN                              = 0x10
+	VM_LOADAVG                        = 0x2
+	VM_MACHFACTOR                     = 0x4
+	VM_MAXID                          = 0x6
+	VM_METER                          = 0x1
+	VM_SWAPUSAGE                      = 0x5
 	VQUIT                             = 0x9
 	VREPRINT                          = 0x6
 	VSTART                            = 0xc

unix/zerrors_darwin_amd64.go

 // mkerrors.sh -m64
-// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+// Code generated by the command above; see README.md. DO NOT EDIT.
 
 // +build amd64,darwin
 
@@ -48,6 +48,7 @@ const (
 	AF_UNIX                           = 0x1
 	AF_UNSPEC                         = 0x0
 	AF_UTUN                           = 0x26
+	ALTWERASE                         = 0x200
 	B0                                = 0x0
 	B110                              = 0x6e
 	B115200                           = 0x1c200
@@ -138,9 +139,18 @@ const (
 	BPF_W                             = 0x0
 	BPF_X                             = 0x8
 	BRKINT                            = 0x2
+	BS0                               = 0x0
+	BS1                               = 0x8000
+	BSDLY                             = 0x8000
 	CFLUSH                            = 0xf
 	CLOCAL                            = 0x8000
+	CR0                               = 0x0
+	CR1                               = 0x1000
+	CR2                               = 0x2000
+	CR3                               = 0x3000
+	CRDLY                             = 0x3000
 	CREAD                             = 0x800
+	CRTSCTS                           = 0x30000
 	CS5                               = 0x0
 	CS6                               = 0x100
 	CS7                               = 0x200
@@ -364,6 +374,9 @@ const (
 	EXTPROC                           = 0x800
 	FD_CLOEXEC                        = 0x1
 	FD_SETSIZE                        = 0x400
+	FF0                               = 0x0
+	FF1                               = 0x4000
+	FFDLY                             = 0x4000
 	FLUSHO                            = 0x800000
 	F_ADDFILESIGS                     = 0x3d
 	F_ADDSIGS                         = 0x3b
@@ -819,7 +832,13 @@ const (
 	NET_RT_MAXID                      = 0xa
 	NET_RT_STAT                       = 0x4
 	NET_RT_TRASH                      = 0x5
+	NL0                               = 0x0
+	NL1                               = 0x100
+	NL2                               = 0x200
+	NL3                               = 0x300
+	NLDLY                             = 0x300
 	NOFLSH                            = 0x80000000
+	NOKERNINFO                        = 0x2000000
 	NOTE_ABSOLUTE                     = 0x8
 	NOTE_ATTRIB                       = 0x8
 	NOTE_BACKGROUND                   = 0x40
@@ -872,6 +891,7 @@ const (
 	ONOCR                             = 0x20
 	ONOEOT                            = 0x8
 	OPOST                             = 0x1
+	OXTABS                            = 0x4
 	O_ACCMODE                         = 0x3
 	O_ALERT                           = 0x20000000
 	O_APPEND                          = 0x8
@@ -932,7 +952,10 @@ const (
 	RLIMIT_CPU_USAGE_MONITOR          = 0x2
 	RLIMIT_DATA                       = 0x2
 	RLIMIT_FSIZE                      = 0x1
+	RLIMIT_MEMLOCK                    = 0x6
 	RLIMIT_NOFILE                     = 0x8
+	RLIMIT_NPROC                      = 0x7
+	RLIMIT_RSS                        = 0x5
 	RLIMIT_STACK                      = 0x3
 	RLIM_INFINITY                     = 0x7fffffffffffffff
 	RTAX_AUTHOR                       = 0x6
@@ -1157,9 +1180,18 @@ const (
 	S_IXGRP                           = 0x8
 	S_IXOTH                           = 0x1
 	S_IXUSR                           = 0x40
+	TAB0                              = 0x0
+	TAB1                              = 0x400
+	TAB2                              = 0x800
+	TAB3                              = 0x4
+	TABDLY                            = 0xc04
 	TCIFLUSH                          = 0x1
+	TCIOFF                            = 0x3
 	TCIOFLUSH                         = 0x3
+	TCION                             = 0x4
 	TCOFLUSH                          = 0x2
+	TCOOFF                            = 0x1
+	TCOON                             = 0x2
 	TCP_CONNECTIONTIMEOUT             = 0x20
 	TCP_ENABLE_ECN                    = 0x104
 	TCP_KEEPALIVE                     = 0x10
@@ -1261,6 +1293,11 @@ const (
 	VKILL                             = 0x5
 	VLNEXT                            = 0xe
 	VMIN                              = 0x10
+	VM_LOADAVG                        = 0x2
+	VM_MACHFACTOR                     = 0x4
+	VM_MAXID                          = 0x6
+	VM_METER                          = 0x1
+	VM_SWAPUSAGE                      = 0x5
 	VQUIT                             = 0x9
 	VREPRINT                          = 0x6
 	VSTART                            = 0xc

unix/zsyscall_darwin_386.go

 // mksyscall.pl -l32 -tags darwin,386 syscall_bsd.go syscall_darwin.go syscall_darwin_386.go
-// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+// Code generated by the command above; see README.md. DO NOT EDIT.
 
 // +build darwin,386
 
@@ -456,6 +456,21 @@ func Exit(code int) {
 
 // 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 Fchdir(fd int) (err error) {
 	_, _, e1 := Syscall(SYS_FCHDIR, uintptr(fd), 0, 0)
 	if e1 != 0 {
@@ -486,6 +501,21 @@ func Fchmod(fd int, mode uint32) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_FCHMODAT, 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 Fchown(fd int, uid int, gid int) (err error) {
 	_, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid))
 	if e1 != 0 {
@@ -496,6 +526,21 @@ func Fchown(fd int, uid int, gid int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_FCHOWNAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(uid), uintptr(gid), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Flock(fd int, how int) (err error) {
 	_, _, e1 := Syscall(SYS_FLOCK, uintptr(fd), uintptr(how), 0)
 	if e1 != 0 {
@@ -745,6 +790,26 @@ func Link(path string, link string) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Linkat(pathfd int, path string, linkfd int, link string, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = BytePtrFromString(link)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_LINKAT, uintptr(pathfd), uintptr(unsafe.Pointer(_p0)), uintptr(linkfd), uintptr(unsafe.Pointer(_p1)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Listen(s int, backlog int) (err error) {
 	_, _, e1 := Syscall(SYS_LISTEN, uintptr(s), uintptr(backlog), 0)
 	if e1 != 0 {
@@ -785,6 +850,21 @@ func Mkdir(path string, mode uint32) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Mkdirat(dirfd int, path string, mode uint32) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_MKDIRAT, 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 Mkfifo(path string, mode uint32) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -899,6 +979,22 @@ func Open(path string, mode int, perm uint32) (fd int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Openat(dirfd int, path string, mode int, perm uint32) (fd int, err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	r0, _, e1 := Syscall6(SYS_OPENAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(perm), 0, 0)
+	fd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Pathconf(path string, name int) (val int, err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -988,6 +1084,28 @@ func Readlink(path string, buf []byte) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Readlinkat(dirfd int, path string, buf []byte) (n int, err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(buf) > 0 {
+		_p1 = unsafe.Pointer(&buf[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := Syscall6(SYS_READLINKAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(buf)), 0, 0)
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Rename(from string, to string) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(from)
@@ -1008,6 +1126,26 @@ func Rename(from string, to string) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Renameat(fromfd int, from string, tofd int, to string) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(from)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = BytePtrFromString(to)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_RENAMEAT, uintptr(fromfd), uintptr(unsafe.Pointer(_p0)), uintptr(tofd), uintptr(unsafe.Pointer(_p1)), 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Revoke(path string) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -1245,6 +1383,26 @@ func Symlink(path string, link string) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Symlinkat(oldpath string, newdirfd int, newpath string) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(oldpath)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = BytePtrFromString(newpath)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_SYMLINKAT, uintptr(unsafe.Pointer(_p0)), uintptr(newdirfd), uintptr(unsafe.Pointer(_p1)))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Sync() (err error) {
 	_, _, e1 := Syscall(SYS_SYNC, 0, 0, 0)
 	if e1 != 0 {
@@ -1308,6 +1466,21 @@ func Unlink(path string) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Unlinkat(dirfd int, path string, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_UNLINKAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(flags))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Unmount(path string, flags int) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)

unix/zsyscall_darwin_amd64.go

 // mksyscall.pl -tags darwin,amd64 syscall_bsd.go syscall_darwin.go syscall_darwin_amd64.go
-// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+// Code generated by the command above; see README.md. DO NOT EDIT.
 
 // +build darwin,amd64
 
@@ -456,6 +456,21 @@ func Exit(code int) {
 
 // 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 Fchdir(fd int) (err error) {
 	_, _, e1 := Syscall(SYS_FCHDIR, uintptr(fd), 0, 0)
 	if e1 != 0 {
@@ -486,6 +501,21 @@ func Fchmod(fd int, mode uint32) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_FCHMODAT, 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 Fchown(fd int, uid int, gid int) (err error) {
 	_, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid))
 	if e1 != 0 {
@@ -496,6 +526,21 @@ func Fchown(fd int, uid int, gid int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_FCHOWNAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(uid), uintptr(gid), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Flock(fd int, how int) (err error) {
 	_, _, e1 := Syscall(SYS_FLOCK, uintptr(fd), uintptr(how), 0)
 	if e1 != 0 {
@@ -745,6 +790,26 @@ func Link(path string, link string) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Linkat(pathfd int, path string, linkfd int, link string, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = BytePtrFromString(link)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_LINKAT, uintptr(pathfd), uintptr(unsafe.Pointer(_p0)), uintptr(linkfd), uintptr(unsafe.Pointer(_p1)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Listen(s int, backlog int) (err error) {
 	_, _, e1 := Syscall(SYS_LISTEN, uintptr(s), uintptr(backlog), 0)
 	if e1 != 0 {
@@ -785,6 +850,21 @@ func Mkdir(path string, mode uint32) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Mkdirat(dirfd int, path string, mode uint32) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_MKDIRAT, 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 Mkfifo(path string, mode uint32) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -899,6 +979,22 @@ func Open(path string, mode int, perm uint32) (fd int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Openat(dirfd int, path string, mode int, perm uint32) (fd int, err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	r0, _, e1 := Syscall6(SYS_OPENAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(perm), 0, 0)
+	fd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Pathconf(path string, name int) (val int, err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -988,6 +1084,28 @@ func Readlink(path string, buf []byte) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Readlinkat(dirfd int, path string, buf []byte) (n int, err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(buf) > 0 {
+		_p1 = unsafe.Pointer(&buf[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := Syscall6(SYS_READLINKAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(buf)), 0, 0)
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Rename(from string, to string) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(from)
@@ -1008,6 +1126,26 @@ func Rename(from string, to string) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Renameat(fromfd int, from string, tofd int, to string) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(from)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = BytePtrFromString(to)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_RENAMEAT, uintptr(fromfd), uintptr(unsafe.Pointer(_p0)), uintptr(tofd), uintptr(unsafe.Pointer(_p1)), 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Revoke(path string) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -1245,6 +1383,26 @@ func Symlink(path string, link string) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Symlinkat(oldpath string, newdirfd int, newpath string) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(oldpath)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = BytePtrFromString(newpath)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_SYMLINKAT, uintptr(unsafe.Pointer(_p0)), uintptr(newdirfd), uintptr(unsafe.Pointer(_p1)))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Sync() (err error) {
 	_, _, e1 := Syscall(SYS_SYNC, 0, 0, 0)
 	if e1 != 0 {
@@ -1308,6 +1466,21 @@ func Unlink(path string) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Unlinkat(dirfd int, path string, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall(SYS_UNLINKAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(flags))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Unmount(path string, flags int) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
@@ -1383,21 +1556,6 @@ func writelen(fd int, buf *byte, nbuf int) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall6(SYS_FCHMODAT, 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 gettimeofday(tp *Timeval) (sec int64, usec int32, err error) {
 	r0, r1, e1 := RawSyscall(SYS_GETTIMEOFDAY, uintptr(unsafe.Pointer(tp)), 0, 0)
 	sec = int64(r0)

unix/ztypes_darwin_386.go

+// cgo -godefs types_darwin.go | go run mkpost.go
+// Code generated by the command above; see README.md. DO NOT EDIT.
+
 // +build 386,darwin
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_darwin.go
 
 package unix
 
@@ -445,3 +446,10 @@ type Termios struct {
 	Ispeed uint32
 	Ospeed uint32
 }
+
+const (
+	AT_FDCWD            = -0x2
+	AT_REMOVEDIR        = 0x80
+	AT_SYMLINK_FOLLOW   = 0x40
+	AT_SYMLINK_NOFOLLOW = 0x20
+)

unix/ztypes_darwin_amd64.go

+// cgo -godefs types_darwin.go | go run mkpost.go
+// Code generated by the command above; see README.md. DO NOT EDIT.
+
 // +build amd64,darwin
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_darwin.go
 
 package unix
 
@@ -458,5 +459,7 @@ type Termios struct {
 
 const (
 	AT_FDCWD            = -0x2
+	AT_REMOVEDIR        = 0x80
+	AT_SYMLINK_FOLLOW   = 0x40
 	AT_SYMLINK_NOFOLLOW = 0x20
 )