bsd/man/man2/undelete.2

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   2 .\"     Jan-Simon Pendry
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  33 .\"     @(#)undelete.2  8.4 (Berkeley) 10/18/94
  34 .\" $FreeBSD: src/lib/libc/sys/undelete.2,v 1.17 2006/01/22 19:49:37 truckman Exp $
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  36 .Dd January 22, 2006
  37 .Dt UNDELETE 2
  38 .Os
  39 .Sh NAME
  40 .Nm undelete
  41 .Nd attempt to recover a deleted file
  42 .Sh LIBRARY
  43 .Lb libc
  44 .Sh SYNOPSIS
  45 .In unistd.h
  46 .Ft int
  47 .Fn undelete "const char *path"
  48 .Sh DESCRIPTION
  49 The
  50 .Fn undelete
  51 system call attempts to recover the deleted file named by
  52 .Fa path .
  53 Currently, this works only when the named object
  54 is a whiteout in a union file system.
  55 The system call removes the whiteout causing
  56 any objects in a lower layer of the
  57 union stack to become visible once more.
  58 .Pp
  59 Eventually, the
  60 .Fn undelete
  61 functionality may be expanded to other file systems able to recover
  62 deleted files such as the log-structured file system.
  63 .Sh RETURN VALUES
  64 .Rv -std undelete
  65 .Sh ERRORS
  66 The
  67 .Fn undelete
  68 succeeds unless:
  69 .Bl -tag -width Er
  70 .It Bq Er ENOTDIR
  71 A component of the path prefix is not a directory.
  72 .It Bq Er ENAMETOOLONG
  73 A component of a pathname exceeded 255 characters,
  74 or an entire path name exceeded 1023 characters.
  75 .It Bq Er EEXIST
  76 The path does not reference a whiteout.
  77 .It Bq Er ENOENT
  78 The named whiteout does not exist.
  79 .It Bq Er EACCES
  80 Search permission is denied for a component of the path prefix.
  81 .It Bq Er EACCES
  82 Write permission is denied on the directory containing the name
  83 to be undeleted.
  84 .It Bq Er ELOOP
  85 Too many symbolic links were encountered in translating the pathname.
  86 .It Bq Er EPERM
  87 The directory containing the name is marked sticky,
  88 and the containing directory is not owned by the effective user ID.
  89 .It Bq Er EINVAL
  90 The last component of the path is
  91 .Ql .. .
  92 .It Bq Er EIO
  93 An I/O error occurred while updating the directory entry.
  94 .It Bq Er EROFS
  95 The name resides on a read-only file system.
  96 .It Bq Er EFAULT
  97 The
  98 .Fa path
  99 argument
 100 points outside the process's allocated address space.
 101 .El
 102 .Sh SEE ALSO
 103 .Xr unlink 2
 104 .Sh HISTORY
 105 The
 106 .Fn undelete
 107 system call first appeared in
 108 .Bx 4.4 Lite .