readdirent_getdirentries.go raw

   1  // Copyright 2019 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  //go:build darwin || zos
   6  
   7  package unix
   8  
   9  import "unsafe"
  10  
  11  // ReadDirent reads directory entries from fd and writes them into buf.
  12  func ReadDirent(fd int, buf []byte) (n int, err error) {
  13  	// Final argument is (basep *uintptr) and the syscall doesn't take nil.
  14  	// 64 bits should be enough. (32 bits isn't even on 386). Since the
  15  	// actual system call is getdirentries64, 64 is a good guess.
  16  	// TODO(rsc): Can we use a single global basep for all calls?
  17  	var base = (*uintptr)(unsafe.Pointer(new(uint64)))
  18  	return Getdirentries(fd, buf, base)
  19  }
  20