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mmap
Dosya Düzenle: mmap_unix.go
// Copyright 2011 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. //go:build unix package mmap import ( "fmt" "io/fs" "os" "syscall" ) func mmapFile(f *os.File) (Data, error) { st, err := f.Stat() if err != nil { return Data{}, err } size := st.Size() pagesize := int64(os.Getpagesize()) if int64(int(size+(pagesize-1))) != size+(pagesize-1) { return Data{}, fmt.Errorf("%s: too large for mmap", f.Name()) } n := int(size) if n == 0 { return Data{f, nil}, nil } mmapLength := int(((size + pagesize - 1) / pagesize) * pagesize) // round up to page size data, err := syscall.Mmap(int(f.Fd()), 0, mmapLength, syscall.PROT_READ, syscall.MAP_SHARED) if err != nil { return Data{}, &fs.PathError{Op: "mmap", Path: f.Name(), Err: err} } return Data{f, data[:n]}, nil }
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