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Source file src/syscall/syscall.go

  // Copyright 2009 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  // Package syscall contains an interface to the low-level operating system
  // primitives. The details vary depending on the underlying system, and
  // by default, godoc will display the syscall documentation for the current
  // system. If you want godoc to display syscall documentation for another
  // system, set $GOOS and $GOARCH to the desired system. For example, if
  // you want to view documentation for freebsd/arm on linux/amd64, set $GOOS
  // to freebsd and $GOARCH to arm.
  // The primary use of syscall is inside other packages that provide a more
  // portable interface to the system, such as "os", "time" and "net".  Use
  // those packages rather than this one if you can.
  // For details of the functions and data types in this package consult
  // the manuals for the appropriate operating system.
  // These calls return err == nil to indicate success; otherwise
  // err is an operating system error describing the failure.
  // On most systems, that error has type syscall.Errno.
  //
  // NOTE: This package is locked down. Code outside the standard
  // Go repository should be migrated to use the corresponding
  // package in the golang.org/x/sys repository. That is also where updates
  // required by new systems or versions should be applied.
  // See https://golang.org/s/go1.4-syscall for more information.
  //
  package syscall
  
  import "unsafe"
  
  //go:generate go run mksyscall_windows.go -systemdll -output zsyscall_windows.go syscall_windows.go security_windows.go
  
  // StringByteSlice converts a string to a NUL-terminated []byte,
  // If s contains a NUL byte this function panics instead of
  // returning an error.
  //
  // Deprecated: Use ByteSliceFromString instead.
  func StringByteSlice(s string) []byte {
  	a, err := ByteSliceFromString(s)
  	if err != nil {
  		panic("syscall: string with NUL passed to StringByteSlice")
  	}
  	return a
  }
  
  // ByteSliceFromString returns a NUL-terminated slice of bytes
  // containing the text of s. If s contains a NUL byte at any
  // location, it returns (nil, EINVAL).
  func ByteSliceFromString(s string) ([]byte, error) {
  	for i := 0; i < len(s); i++ {
  		if s[i] == 0 {
  			return nil, EINVAL
  		}
  	}
  	a := make([]byte, len(s)+1)
  	copy(a, s)
  	return a, nil
  }
  
  // StringBytePtr returns a pointer to a NUL-terminated array of bytes.
  // If s contains a NUL byte this function panics instead of returning
  // an error.
  //
  // Deprecated: Use BytePtrFromString instead.
  func StringBytePtr(s string) *byte { return &StringByteSlice(s)[0] }
  
  // BytePtrFromString returns a pointer to a NUL-terminated array of
  // bytes containing the text of s. If s contains a NUL byte at any
  // location, it returns (nil, EINVAL).
  func BytePtrFromString(s string) (*byte, error) {
  	a, err := ByteSliceFromString(s)
  	if err != nil {
  		return nil, err
  	}
  	return &a[0], nil
  }
  
  // Single-word zero for use when we need a valid pointer to 0 bytes.
  // See mksyscall.pl.
  var _zero uintptr
  
  func (ts *Timespec) Unix() (sec int64, nsec int64) {
  	return int64(ts.Sec), int64(ts.Nsec)
  }
  
  func (tv *Timeval) Unix() (sec int64, nsec int64) {
  	return int64(tv.Sec), int64(tv.Usec) * 1000
  }
  
  func (ts *Timespec) Nano() int64 {
  	return int64(ts.Sec)*1e9 + int64(ts.Nsec)
  }
  
  func (tv *Timeval) Nano() int64 {
  	return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000
  }
  
  // Getpagesize is provided by the runtime.
  
  func Getpagesize() int
  
  // use is a no-op, but the compiler cannot see that it is.
  // Calling use(p) ensures that p is kept live until that point.
  // This was needed until Go 1.6 to call syscall.Syscall correctly.
  // As of Go 1.6 the compiler handles that case automatically.
  // The uses and definition of use can be removed early in the Go 1.7 cycle.
  //go:noescape
  func use(p unsafe.Pointer)
  

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