diff --git a/unix/syscall_darwin.go b/unix/syscall_darwin.go
index 6d6f073..4ee4b31 100644
--- a/unix/syscall_darwin.go
+++ b/unix/syscall_darwin.go
@@ -251,6 +251,7 @@
 //sys	Mlock(b []byte) (err error)
 //sys	Mlockall(flags int) (err error)
 //sys	Mprotect(b []byte, prot int) (err error)
+//sys	Msync(b []byte, flags int) (err error)
 //sys	Munlock(b []byte) (err error)
 //sys	Munlockall() (err error)
 //sys	Open(path string, mode int, perm uint32) (fd int, err error)
@@ -479,7 +480,6 @@
 // Sendmsg_nocancel
 // Recvfrom_nocancel
 // Accept_nocancel
-// Msync_nocancel
 // Fcntl_nocancel
 // Select_nocancel
 // Fsync_nocancel
diff --git a/unix/zerrors_darwin_amd64.go b/unix/zerrors_darwin_amd64.go
index 2efac8d..ce8da84 100644
--- a/unix/zerrors_darwin_amd64.go
+++ b/unix/zerrors_darwin_amd64.go
@@ -144,6 +144,14 @@
 	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
@@ -342,13 +350,14 @@
 	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
@@ -359,6 +368,7 @@
 	EV_DELETE                         = 0x2
 	EV_DISABLE                        = 0x8
 	EV_DISPATCH                       = 0x80
+	EV_DISPATCH2                      = 0x180
 	EV_ENABLE                         = 0x4
 	EV_EOF                            = 0x8000
 	EV_ERROR                          = 0x4000
@@ -369,6 +379,8 @@
 	EV_POLL                           = 0x1000
 	EV_RECEIPT                        = 0x40
 	EV_SYSFLAGS                       = 0xf000
+	EV_UDATA_SPECIFIC                 = 0x100
+	EV_VANISHED                       = 0x200
 	EXTA                              = 0x4b00
 	EXTB                              = 0x9600
 	EXTPROC                           = 0x800
@@ -379,9 +391,13 @@
 	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
@@ -783,11 +799,13 @@
 	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
@@ -799,6 +817,8 @@
 	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
@@ -862,11 +882,14 @@
 	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
@@ -900,6 +923,7 @@
 	O_CREAT                           = 0x200
 	O_DIRECTORY                       = 0x100000
 	O_DP_GETRAWENCRYPTED              = 0x1
+	O_DP_GETRAWUNENCRYPTED            = 0x2
 	O_DSYNC                           = 0x400000
 	O_EVTONLY                         = 0x8000
 	O_EXCL                            = 0x800
@@ -1125,6 +1149,8 @@
 	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
@@ -1193,7 +1219,9 @@
 	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
diff --git a/unix/zsyscall_darwin_386.go b/unix/zsyscall_darwin_386.go
index 43f67b2..2198f0b 100644
--- a/unix/zsyscall_darwin_386.go
+++ b/unix/zsyscall_darwin_386.go
@@ -937,6 +937,22 @@
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Msync(b []byte, flags int) (err error) {
+	var _p0 unsafe.Pointer
+	if len(b) > 0 {
+		_p0 = unsafe.Pointer(&b[0])
+	} else {
+		_p0 = unsafe.Pointer(&_zero)
+	}
+	_, _, e1 := Syscall(SYS_MSYNC, uintptr(_p0), uintptr(len(b)), uintptr(flags))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Munlock(b []byte) (err error) {
 	var _p0 unsafe.Pointer
 	if len(b) > 0 {
diff --git a/unix/zsyscall_darwin_amd64.go b/unix/zsyscall_darwin_amd64.go
index 790d0b1..d5af924 100644
--- a/unix/zsyscall_darwin_amd64.go
+++ b/unix/zsyscall_darwin_amd64.go
@@ -937,6 +937,22 @@
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Msync(b []byte, flags int) (err error) {
+	var _p0 unsafe.Pointer
+	if len(b) > 0 {
+		_p0 = unsafe.Pointer(&b[0])
+	} else {
+		_p0 = unsafe.Pointer(&_zero)
+	}
+	_, _, e1 := Syscall(SYS_MSYNC, uintptr(_p0), uintptr(len(b)), uintptr(flags))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Munlock(b []byte) (err error) {
 	var _p0 unsafe.Pointer
 	if len(b) > 0 {