1// Copyright 2009 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// +build windows
6
7// Package windows contains an interface to the low-level operating system
8// primitives. OS details vary depending on the underlying system, and
9// by default, godoc will display the OS-specific documentation for the current
10// system. If you want godoc to display syscall documentation for another
11// system, set $GOOS and $GOARCH to the desired system. For example, if
12// you want to view documentation for freebsd/arm on linux/amd64, set $GOOS
13// to freebsd and $GOARCH to arm.
14// The primary use of this package is inside other packages that provide a more
15// portable interface to the system, such as "os", "time" and "net".  Use
16// those packages rather than this one if you can.
17// For details of the functions and data types in this package consult
18// the manuals for the appropriate operating system.
19// These calls return err == nil to indicate success; otherwise
20// err represents an operating system error describing the failure and
21// holds a value of type syscall.Errno.
22package windows // import "golang.org/x/sys/windows"
23
24import (
25	"syscall"
26)
27
28// ByteSliceFromString returns a NUL-terminated slice of bytes
29// containing the text of s. If s contains a NUL byte at any
30// location, it returns (nil, syscall.EINVAL).
31func ByteSliceFromString(s string) ([]byte, error) {
32	for i := 0; i < len(s); i++ {
33		if s[i] == 0 {
34			return nil, syscall.EINVAL
35		}
36	}
37	a := make([]byte, len(s)+1)
38	copy(a, s)
39	return a, nil
40}
41
42// BytePtrFromString returns a pointer to a NUL-terminated array of
43// bytes containing the text of s. If s contains a NUL byte at any
44// location, it returns (nil, syscall.EINVAL).
45func BytePtrFromString(s string) (*byte, error) {
46	a, err := ByteSliceFromString(s)
47	if err != nil {
48		return nil, err
49	}
50	return &a[0], nil
51}
52
53// Single-word zero for use when we need a valid pointer to 0 bytes.
54// See mksyscall.pl.
55var _zero uintptr
56
57func (ts *Timespec) Unix() (sec int64, nsec int64) {
58	return int64(ts.Sec), int64(ts.Nsec)
59}
60
61func (tv *Timeval) Unix() (sec int64, nsec int64) {
62	return int64(tv.Sec), int64(tv.Usec) * 1000
63}
64
65func (ts *Timespec) Nano() int64 {
66	return int64(ts.Sec)*1e9 + int64(ts.Nsec)
67}
68
69func (tv *Timeval) Nano() int64 {
70	return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000
71}
72