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// Copyright 2019 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.
// +build darwin dragonfly freebsd linux openbsd
package ld
import (
"syscall"
"unsafe"
)
func (out *OutBuf) Mmap(filesize uint64) error {
err := out.f.Truncate(int64(filesize))
if err != nil {
Exitf("resize output file failed: %v", err)
}
out.buf, err = syscall.Mmap(int(out.f.Fd()), 0, int(filesize), syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED|syscall.MAP_FILE)
return err
}
func (out *OutBuf) Munmap() {
err := out.Msync()
if err != nil {
Exitf("msync output file failed: %v", err)
}
syscall.Munmap(out.buf)
out.buf = nil
_, err = out.f.Seek(out.off, 0)
if err != nil {
Exitf("seek output file failed: %v", err)
}
}
func (out *OutBuf) Msync() error {
// TODO: netbsd supports mmap and msync, but the syscall package doesn't define MSYNC.
// It is excluded from the build tag for now.
_, _, errno := syscall.Syscall(syscall.SYS_MSYNC, uintptr(unsafe.Pointer(&out.buf[0])), uintptr(len(out.buf)), syscall.MS_SYNC)
if errno != 0 {
return errno
}
return nil
}
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