readdirent_getdirentries.go

     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
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