dirent_linux.go

     1  // Copyright 2020 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 os
     6  
     7  import (
     8  	"syscall"
     9  	"unsafe"
    10  )
    11  
    12  func direntIno(buf []byte) (uint64, bool) {
    13  	return readInt(buf, unsafe.Offsetof(syscall.Dirent{}.Ino), unsafe.Sizeof(syscall.Dirent{}.Ino))
    14  }
    15  
    16  func direntReclen(buf []byte) (uint64, bool) {
    17  	return readInt(buf, unsafe.Offsetof(syscall.Dirent{}.Reclen), unsafe.Sizeof(syscall.Dirent{}.Reclen))
    18  }
    19  
    20  func direntNamlen(buf []byte) (uint64, bool) {
    21  	reclen, ok := direntReclen(buf)
    22  	if !ok {
    23  		return 0, false
    24  	}
    25  	return reclen - uint64(unsafe.Offsetof(syscall.Dirent{}.Name)), true
    26  }
    27  
    28  func direntType(buf []byte) FileMode {
    29  	off := unsafe.Offsetof(syscall.Dirent{}.Type)
    30  	if off >= uintptr(len(buf)) {
    31  		return ^FileMode(0) // unknown
    32  	}
    33  	typ := buf[off]
    34  	switch typ {
    35  	case syscall.DT_BLK:
    36  		return ModeDevice
    37  	case syscall.DT_CHR:
    38  		return ModeDevice | ModeCharDevice
    39  	case syscall.DT_DIR:
    40  		return ModeDir
    41  	case syscall.DT_FIFO:
    42  		return ModeNamedPipe
    43  	case syscall.DT_LNK:
    44  		return ModeSymlink
    45  	case syscall.DT_REG:
    46  		return 0
    47  	case syscall.DT_SOCK:
    48  		return ModeSocket
    49  	}
    50  	return ^FileMode(0) // unknown
    51  }
    52
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