Update to last common bleve (#3986)

vendor/github.com/edsrzf/mmap-go/mmap_unix.go

@@ -0,0 +1,67 @@
+// Copyright 2011 Evan Shaw. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin dragonfly freebsd linux openbsd solaris netbsd
+
+package mmap
+
+import (
+	"syscall"
+)
+
+func mmap(len int, inprot, inflags, fd uintptr, off int64) ([]byte, error) {
+	flags := syscall.MAP_SHARED
+	prot := syscall.PROT_READ
+	switch {
+	case inprot&COPY != 0:
+		prot |= syscall.PROT_WRITE
+		flags = syscall.MAP_PRIVATE
+	case inprot&RDWR != 0:
+		prot |= syscall.PROT_WRITE
+	}
+	if inprot&EXEC != 0 {
+		prot |= syscall.PROT_EXEC
+	}
+	if inflags&ANON != 0 {
+		flags |= syscall.MAP_ANON
+	}
+
+	b, err := syscall.Mmap(int(fd), off, len, prot, flags)
+	if err != nil {
+		return nil, err
+	}
+	return b, nil
+}
+
+func flush(addr, len uintptr) error {
+	_, _, errno := syscall.Syscall(_SYS_MSYNC, addr, len, _MS_SYNC)
+	if errno != 0 {
+		return syscall.Errno(errno)
+	}
+	return nil
+}
+
+func lock(addr, len uintptr) error {
+	_, _, errno := syscall.Syscall(syscall.SYS_MLOCK, addr, len, 0)
+	if errno != 0 {
+		return syscall.Errno(errno)
+	}
+	return nil
+}
+
+func unlock(addr, len uintptr) error {
+	_, _, errno := syscall.Syscall(syscall.SYS_MUNLOCK, addr, len, 0)
+	if errno != 0 {
+		return syscall.Errno(errno)
+	}
+	return nil
+}
+
+func unmap(addr, len uintptr) error {
+	_, _, errno := syscall.Syscall(syscall.SYS_MUNMAP, addr, len, 0)
+	if errno != 0 {
+		return syscall.Errno(errno)
+	}
+	return nil
+}