// wherein large mappings can cause fork to fail.
		flags |= _sunosMAP_NORESERVE
	}
	p, err := mmap(v, n, _PROT_NONE, flags, -1, 0)
	if err != 0 {
		return nil
	}
	return p
}

const _sunosEAGAIN = 11
const _ENOMEM = 12

func sysMapOS(v unsafe.Pointer, n uintptr) {
	p, err := mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_FIXED|_MAP_PRIVATE, -1, 0)

//go:build !unix && !windows

package ld

// Mmap allocates an in-heap output buffer with the given size. It copies
// any old data (if any) to the new buffer.
func (out *OutBuf) Mmap(filesize uint64) error {
	// We need space to put all the symbols before we apply relocations.
	oldheap := out.heap
	if filesize < uint64(len(oldheap)) {
		panic("mmap size too small")
	}
	out.heap = make([]byte, filesize)

//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 {

// prevents us from allocating more stack.
//
//go:nosplit
func sysAllocOS(n uintptr) unsafe.Pointer {
	p, err := mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0)
	if err != 0 {
		if err == _EACCES {
			print("runtime: mmap: access denied\n")
			exit(2)
		}
		if err == _EAGAIN {
			print("runtime: mmap: too much locked memory (check 'ulimit -l').\n")
			exit(2)
		}
		return nil
	}
	return p
}

	// doesn't fault. See issue 60825.

	// Mmap two pages of memory, and make the second page inaccessible,
	// so we have an address at the end of a page.
	pagesize := syscall.Getpagesize()
	b, err := syscall.Mmap(0, 0, 2*pagesize, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
	if err != nil {
		t.Fatalf("mmap failed %s", err)
	}
	defer syscall.Munmap(b)

		Exitf("resize output file failed: %v", err)
	}

	low, high := uint32(filesize), uint32(filesize>>32)
	fmap, err := syscall.CreateFileMapping(syscall.Handle(out.f.Fd()), nil, syscall.PAGE_READWRITE, high, low, nil)
	if err != nil {
		return err
	}
	defer syscall.CloseHandle(fmap)

	ptr, err := syscall.MapViewOfFile(fmap, syscall.FILE_MAP_READ|syscall.FILE_MAP_WRITE, 0, 0, uintptr(filesize))
	if err != nil {
		return err
	}

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build unix

// Export guts for testing.

package runtime

var Mmap = mmap
var Munmap = munmap

const ENOMEM = _ENOMEM
const MAP_ANON = _MAP_ANON
const MAP_PRIVATE = _MAP_PRIVATE
const MAP_FIXED = _MAP_FIXED

func GetPhysPageSize() uintptr {
	return physPageSize

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build (js && wasm) || wasip1 || plan9 || (solaris && !go1.20)

package mmap

import (
	"io"
	"os"
)

// mmapFile on other systems doesn't mmap the file. It just reads everything.
func mmapFile(f *os.File, _ *Data) (Data, error) {
	b, err := io.ReadAll(f)
	if err != nil {
		return Data{}, err
	}

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build (js && wasm) || wasip1 || plan9

package mmap

import (
	"io"
	"os"
)

// mmapFile on other systems doesn't mmap the file. It just reads everything.
func mmapFile(f *os.File) (Data, error) {
	b, err := io.ReadAll(f)
	if err != nil {
		return Data{}, err
	}
	return Data{f, b}, nil

//go:build unix

package syscall

import _ "unsafe" // for linkname

// mmap should be an internal detail,
// but widely used packages access it using linkname.
// Notable members of the hall of shame include:
//   - modernc.org/memory
//   - github.com/ncruces/go-sqlite3
//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//