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 darwin dragonfly freebsd linux netbsd openbsd solaris 6 7// Package unix 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 OS-specific documentation for the current 10// system. If you want godoc to display OS 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// 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. 18// 19// For details of the functions and data types in this package consult 20// the manuals for the appropriate operating system. 21// 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. 25package unix 26 27import "strings" 28 29// ByteSliceFromString returns a NUL-terminated slice of bytes 30// containing the text of s. If s contains a NUL byte at any 31// location, it returns (nil, EINVAL). 32func ByteSliceFromString(s string) ([]byte, error) { 33 if strings.IndexByte(s, 0) != -1 { 34 return nil, EINVAL 35 } 36 a := make([]byte, len(s)+1) 37 copy(a, s) 38 return a, nil 39} 40 41// BytePtrFromString returns a pointer to a NUL-terminated array of 42// bytes containing the text of s. If s contains a NUL byte at any 43// location, it returns (nil, EINVAL). 44func BytePtrFromString(s string) (*byte, error) { 45 a, err := ByteSliceFromString(s) 46 if err != nil { 47 return nil, err 48 } 49 return &a[0], nil 50} 51 52// Single-word zero for use when we need a valid pointer to 0 bytes. 53// See mkunix.pl. 54var _zero uintptr 55