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vsphere-influxdb-go/vendor/github.com/influxdata/influxdb/pkg/mmap/mmap_unix.go

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2017-10-25 22:52:40 +02:00
// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package mmap provides a way to memory-map a file.
package mmap
import (
"os"
"syscall"
)
// Map memory-maps a file.
func Map(path string) ([]byte, error) {
f, err := os.Open(path)
if err != nil {
return nil, err
}
defer f.Close()
fi, err := f.Stat()
if err != nil {
return nil, err
} else if fi.Size() == 0 {
return nil, nil
}
data, err := syscall.Mmap(int(f.Fd()), 0, int(fi.Size()), syscall.PROT_READ, syscall.MAP_SHARED)
if err != nil {
return nil, err
}
return data, nil
}
// Unmap closes the memory-map.
func Unmap(data []byte) error {
if data == nil {
return nil
}
return syscall.Munmap(data)
}