unix: add Msync function on Linux

Add the Msync function on Linux. See
http://man7.org/linux/man-pages/man2/msync.2.html

Updates golang/go#8245

Change-Id: I964259bafc8d4fbca09961443f21c4278bf56706
Reviewed-on: https://go-review.googlesource.com/50891Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

unix/syscall_linux.go

@@ -1315,6 +1315,7 @@ func Munmap(b []byte) (err error) {
 //sys	Mlock(b []byte) (err error)
 //sys	Munlock(b []byte) (err error)
 //sys	Mlockall(flags int) (err error)
+//sys	Msync(b []byte, flags int) (err error)
 //sys	Munlockall() (err error)
 
 // Vmsplice splices user pages from a slice of Iovecs into a pipe specified by fd,
@@ -1394,7 +1395,6 @@ func Vmsplice(fd int, iovs []Iovec, flags int) (int, error) {
 // Msgget
 // Msgrcv
 // Msgsnd
-// Msync
 // Newfstatat
 // Nfsservctl
 // Personality

unix/zsyscall_linux_386.go

@@ -1462,6 +1462,22 @@ func Mlockall(flags int) (err error) {
 
 // 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 Munlockall() (err error) {
 	_, _, e1 := Syscall(SYS_MUNLOCKALL, 0, 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_amd64.go

@@ -1462,6 +1462,22 @@ func Mlockall(flags int) (err error) {
 
 // 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 Munlockall() (err error) {
 	_, _, e1 := Syscall(SYS_MUNLOCKALL, 0, 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_arm.go

@@ -1462,6 +1462,22 @@ func Mlockall(flags int) (err error) {
 
 // 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 Munlockall() (err error) {
 	_, _, e1 := Syscall(SYS_MUNLOCKALL, 0, 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_arm64.go

@@ -1462,6 +1462,22 @@ func Mlockall(flags int) (err error) {
 
 // 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 Munlockall() (err error) {
 	_, _, e1 := Syscall(SYS_MUNLOCKALL, 0, 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_mips.go

@@ -1462,6 +1462,22 @@ func Mlockall(flags int) (err error) {
 
 // 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 Munlockall() (err error) {
 	_, _, e1 := Syscall(SYS_MUNLOCKALL, 0, 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_mips64.go

@@ -1462,6 +1462,22 @@ func Mlockall(flags int) (err error) {
 
 // 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 Munlockall() (err error) {
 	_, _, e1 := Syscall(SYS_MUNLOCKALL, 0, 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_mips64le.go

@@ -1462,6 +1462,22 @@ func Mlockall(flags int) (err error) {
 
 // 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 Munlockall() (err error) {
 	_, _, e1 := Syscall(SYS_MUNLOCKALL, 0, 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_mipsle.go

@@ -1462,6 +1462,22 @@ func Mlockall(flags int) (err error) {
 
 // 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 Munlockall() (err error) {
 	_, _, e1 := Syscall(SYS_MUNLOCKALL, 0, 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_ppc64.go

@@ -1462,6 +1462,22 @@ func Mlockall(flags int) (err error) {
 
 // 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 Munlockall() (err error) {
 	_, _, e1 := Syscall(SYS_MUNLOCKALL, 0, 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_ppc64le.go

@@ -1462,6 +1462,22 @@ func Mlockall(flags int) (err error) {
 
 // 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 Munlockall() (err error) {
 	_, _, e1 := Syscall(SYS_MUNLOCKALL, 0, 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_s390x.go

@@ -1462,6 +1462,22 @@ func Mlockall(flags int) (err error) {
 
 // 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 Munlockall() (err error) {
 	_, _, e1 := Syscall(SYS_MUNLOCKALL, 0, 0, 0)
 	if e1 != 0 {