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  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. // +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
  5. // Package unix contains an interface to the low-level operating system
  6. // primitives. OS details vary depending on the underlying system, and
  7. // by default, godoc will display OS-specific documentation for the current
  8. // system. If you want godoc to display OS documentation for another
  9. // system, set $GOOS and $GOARCH to the desired system. For example, if
  10. // you want to view documentation for freebsd/arm on linux/amd64, set $GOOS
  11. // to freebsd and $GOARCH to arm.
  12. //
  13. // The primary use of this package is inside other packages that provide a more
  14. // portable interface to the system, such as "os", "time" and "net". Use
  15. // those packages rather than this one if you can.
  16. //
  17. // For details of the functions and data types in this package consult
  18. // the manuals for the appropriate operating system.
  19. //
  20. // These calls return err == nil to indicate success; otherwise
  21. // err represents an operating system error describing the failure and
  22. // holds a value of type syscall.Errno.
  23. package unix // import "golang.org/x/sys/unix"
  24. import "strings"
  25. // ByteSliceFromString returns a NUL-terminated slice of bytes
  26. // containing the text of s. If s contains a NUL byte at any
  27. // location, it returns (nil, EINVAL).
  28. func ByteSliceFromString(s string) ([]byte, error) {
  29. if strings.IndexByte(s, 0) != -1 {
  30. return nil, EINVAL
  31. }
  32. a := make([]byte, len(s)+1)
  33. copy(a, s)
  34. return a, nil
  35. }
  36. // BytePtrFromString returns a pointer to a NUL-terminated array of
  37. // bytes containing the text of s. If s contains a NUL byte at any
  38. // location, it returns (nil, EINVAL).
  39. func BytePtrFromString(s string) (*byte, error) {
  40. a, err := ByteSliceFromString(s)
  41. if err != nil {
  42. return nil, err
  43. }
  44. return &a[0], nil
  45. }
  46. // Single-word zero for use when we need a valid pointer to 0 bytes.
  47. var _zero uintptr
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