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.
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.
15 // The primary use of this package is inside other packages that provide a more
16 // portable interface to the system, such as "os", "time" and "net". Use
17 // those packages rather than this one if you can.
19 // For details of the functions and data types in this package consult
20 // the manuals for the appropriate operating system.
22 // These calls return err == nil to indicate success; otherwise
23 // err represents an operating system error describing the failure and
24 // holds a value of type syscall.Errno.
25 package windows // import "golang.org/x/sys/windows"
33 "golang.org/x/sys/internal/unsafeheader"
36 // ByteSliceFromString returns a NUL-terminated slice of bytes
37 // containing the text of s. If s contains a NUL byte at any
38 // location, it returns (nil, syscall.EINVAL).
39 func ByteSliceFromString(s string) ([]byte, error) {
40 if strings.IndexByte(s, 0) != -1 {
41 return nil, syscall.EINVAL
43 a := make([]byte, len(s)+1)
48 // BytePtrFromString returns a pointer to a NUL-terminated array of
49 // bytes containing the text of s. If s contains a NUL byte at any
50 // location, it returns (nil, syscall.EINVAL).
51 func BytePtrFromString(s string) (*byte, error) {
52 a, err := ByteSliceFromString(s)
59 // ByteSliceToString returns a string form of the text represented by the slice s, with a terminating NUL and any
60 // bytes after the NUL removed.
61 func ByteSliceToString(s []byte) string {
62 if i := bytes.IndexByte(s, 0); i != -1 {
68 // BytePtrToString takes a pointer to a sequence of text and returns the corresponding string.
69 // If the pointer is nil, it returns the empty string. It assumes that the text sequence is terminated
70 // at a zero byte; if the zero byte is not present, the program may crash.
71 func BytePtrToString(p *byte) string {
79 // Find NUL terminator.
81 for ptr := unsafe.Pointer(p); *(*byte)(ptr) != 0; n++ {
82 ptr = unsafe.Pointer(uintptr(ptr) + 1)
86 h := (*unsafeheader.Slice)(unsafe.Pointer(&s))
87 h.Data = unsafe.Pointer(p)
94 // Single-word zero for use when we need a valid pointer to 0 bytes.
98 func (ts *Timespec) Unix() (sec int64, nsec int64) {
99 return int64(ts.Sec), int64(ts.Nsec)
102 func (tv *Timeval) Unix() (sec int64, nsec int64) {
103 return int64(tv.Sec), int64(tv.Usec) * 1000
106 func (ts *Timespec) Nano() int64 {
107 return int64(ts.Sec)*1e9 + int64(ts.Nsec)
110 func (tv *Timeval) Nano() int64 {
111 return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000