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 aix 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. 25 package unix // import "golang.org/x/sys/unix" 26 27 import "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). 32 func 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). 44 func 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 var _zero uintptr 54