2 // Mono.Unix/UnixSymbolicLinkInfo.cs
5 // Jonathan Pryor (jonpryor@vt.edu)
7 // (C) 2004 Jonathan Pryor
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
36 public sealed class UnixSymbolicLinkInfo : UnixFileSystemInfo
38 public UnixSymbolicLinkInfo (string path)
43 internal UnixSymbolicLinkInfo (string path, Stat stat)
48 public override string Name {
49 get {return UnixPath.GetFileName (FullPath);}
52 // maximum number of bytes read from the symbolic link
53 public static readonly int ContentsLength = 1024;
55 public UnixFileSystemInfo Contents {
57 return UnixFileSystemInfo.Create (ContentsPath);
61 public string ContentsPath {
67 public bool HasContents {
69 return TryReadLink () != null;
73 public void CreateSymbolicLinkTo (string path)
75 int r = Syscall.symlink (path, OriginalPath);
76 UnixMarshal.ThrowExceptionForLastErrorIf (r);
79 public void CreateSymbolicLinkTo (UnixFileSystemInfo path)
81 int r = Syscall.symlink (path.FullName, OriginalPath);
82 UnixMarshal.ThrowExceptionForLastErrorIf (r);
85 public override void Delete ()
87 int r = Syscall.unlink (FullPath);
88 UnixMarshal.ThrowExceptionForLastErrorIf (r);
92 public override void SetOwner (uint owner, uint group)
94 int r = Syscall.lchown (FullPath, owner, group);
95 UnixMarshal.ThrowExceptionForLastErrorIf (r);
98 // TODO: Should ReadLink be in UnixSymbolicLinkInfo?
99 private string ReadLink ()
101 string r = TryReadLink ();
103 UnixMarshal.ThrowExceptionForLastError ();
107 private string TryReadLink ()
109 // Who came up with readlink(2)? There doesn't seem to be a way to
110 // properly handle it.
111 StringBuilder sb = new StringBuilder (ContentsLength+1);
112 int r = Syscall.readlink (FullPath, sb, (ulong) ContentsLength);
115 return sb.ToString().Substring (0, r);