github.com/SandwichDev/go-internals@v0.0.0-20210605002614-12311ac6b2c5/poll/fd_opendir_darwin.go (about)

     1  // Copyright 2018 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  package poll
     6  
     7  import (
     8  	"syscall"
     9  	_ "unsafe" // for go:linkname
    10  )
    11  
    12  // OpenDir returns a pointer to a DIR structure suitable for
    13  // ReadDir. In case of an error, the name of the failed
    14  // syscall is returned along with a syscall.Errno.
    15  func (fd *FD) OpenDir() (uintptr, string, error) {
    16  	// fdopendir(3) takes control of the file descriptor,
    17  	// so use a dup.
    18  	fd2, call, err := fd.Dup()
    19  	if err != nil {
    20  		return 0, call, err
    21  	}
    22  	var dir uintptr
    23  	for {
    24  		dir, err = fdopendir(fd2)
    25  		if err != syscall.EINTR {
    26  			break
    27  		}
    28  	}
    29  	if err != nil {
    30  		syscall.Close(fd2)
    31  		return 0, "fdopendir", err
    32  	}
    33  	return dir, "", nil
    34  }
    35  
    36  // Implemented in syscall/syscall_darwin.go.
    37  //go:linkname fdopendir syscall.fdopendir
    38  func fdopendir(fd int) (dir uintptr, err error)