openbsd_unveil.go
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openbsd_unveil.go
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	// Copyright 2018 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 openbsd

	package unix

	import (
	"syscall"
	"unsafe"
	)

	// Unveil implements the unveil syscall.
	// For more information see unveil(2).
	// Note that the special case of blocking further
	// unveil calls is handled by UnveilBlock.
	func Unveil(path string, flags string) error {
	pathPtr, err := syscall.BytePtrFromString(path)
	if err != nil {
	return err
	}
	flagsPtr, err := syscall.BytePtrFromString(flags)
	if err != nil {
	return err
	}
	_, _, e := syscall.Syscall(SYS_UNVEIL, uintptr(unsafe.Pointer(pathPtr)), uintptr(unsafe.Pointer(flagsPtr)), 0)
	if e != 0 {
	return e
	}
	return nil
	}

	// UnveilBlock blocks future unveil calls.
	// For more information see unveil(2).
	func UnveilBlock() error {
	// Both pointers must be nil.
	var pathUnsafe, flagsUnsafe unsafe.Pointer
	_, _, e := syscall.Syscall(SYS_UNVEIL, uintptr(pathUnsafe), uintptr(flagsUnsafe), 0)
	if e != 0 {
	return e
	}
	return nil
	}