vendor/github.com/fsouza/go-dockerclient/external/golang.org/x/sys/unix/syscall.go

   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 // 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.
  22 package unix // import "github.com/fsouza/go-dockerclient/external/golang.org/x/sys/unix"
  23
  24 import "unsafe"
  25
  26 // ByteSliceFromString returns a NUL-terminated slice of bytes
  27 // containing the text of s. If s contains a NUL byte at any
  28 // location, it returns (nil, EINVAL).
  29 func ByteSliceFromString(s string) ([]byte, error) {
  30         for i := 0; i < len(s); i++ {
  31                 if s[i] == 0 {
  32                         return nil, EINVAL
  33                 }
  34         }
  35         a := make([]byte, len(s)+1)
  36         copy(a, s)
  37         return a, nil
  38 }
  39
  40 // BytePtrFromString returns a pointer to a NUL-terminated array of
  41 // bytes containing the text of s. If s contains a NUL byte at any
  42 // location, it returns (nil, EINVAL).
  43 func BytePtrFromString(s string) (*byte, error) {
  44         a, err := ByteSliceFromString(s)
  45         if err != nil {
  46                 return nil, err
  47         }
  48         return &a[0], nil
  49 }
  50
  51 // Single-word zero for use when we need a valid pointer to 0 bytes.
  52 // See mkunix.pl.
  53 var _zero uintptr
  54
  55 func (ts *Timespec) Unix() (sec int64, nsec int64) {
  56         return int64(ts.Sec), int64(ts.Nsec)
  57 }
  58
  59 func (tv *Timeval) Unix() (sec int64, nsec int64) {
  60         return int64(tv.Sec), int64(tv.Usec) * 1000
  61 }
  62
  63 func (ts *Timespec) Nano() int64 {
  64         return int64(ts.Sec)*1e9 + int64(ts.Nsec)
  65 }
  66
  67 func (tv *Timeval) Nano() int64 {
  68         return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000
  69 }
  70
  71 // use is a no-op, but the compiler cannot see that it is.
  72 // Calling use(p) ensures that p is kept live until that point.
  73 //go:noescape
  74 func use(p unsafe.Pointer)