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//
// Mono.Unix/UnixDriveInfo.cs
//
// Authors:
// Jonathan Pryor (jonpryor@vt.edu)
//
// (C) 2004 Jonathan Pryor
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.IO;
using Mono.Unix;
namespace Mono.Unix {
public enum UnixDriveType {
Unknown,
NoRootDirectory,
Removable,
Fixed,
Network,
CDRom,
Ram
}
// All methods & properties can throw IOException
public sealed class UnixDriveInfo
{
private Native.Statvfs stat;
private Native.Fstab fstab;
public UnixDriveInfo (string mountPoint)
{
if (mountPoint == null)
throw new ArgumentNullException ("mountPoint");
fstab = Native.Syscall.getfsfile (mountPoint);
if (fstab == null)
throw new ArgumentException ("mountPoint isn't valid: " + mountPoint);
// throws ArgumentException if driveName isn't valid
// though .NET also has a DriveNotFoundException class, so maybe that's
// more appropriate?
}
public static UnixDriveInfo GetForSpecialFile (string specialFile)
{
if (specialFile == null)
throw new ArgumentNullException ("specialFile");
Native.Fstab f = Native.Syscall.getfsspec (specialFile);
if (f == null)
throw new ArgumentException ("specialFile isn't valid: " + specialFile);
return new UnixDriveInfo (f);
}
private UnixDriveInfo (Native.Fstab fstab)
{
this.fstab = fstab;
}
public long AvailableFreeSpace {
get {Refresh (); return Convert.ToInt64 (stat.f_bavail * stat.f_bsize);}
}
public string DriveFormat {
get {return fstab.fs_vfstype;}
}
public UnixDriveType DriveType {
get {return UnixDriveType.Unknown;}
}
// this throws no exceptions
public bool IsReady {
get {return Refresh (false);}
}
public string Name {
get {return fstab.fs_file;}
}
public UnixDirectoryInfo RootDirectory {
get {return new UnixDirectoryInfo (fstab.fs_file);}
}
public long TotalFreeSpace {
get {Refresh (); return (long) (stat.f_bfree * stat.f_bsize);}
}
public long TotalSize {
get {Refresh (); return (long) (stat.f_frsize * stat.f_blocks);}
}
// also throws SecurityException if caller lacks perms
public string VolumeLabel {
get {return fstab.fs_spec;}
// set {}
}
public long MaximumFilenameLength {
get {Refresh (); return Convert.ToInt64 (stat.f_namemax);}
}
public static UnixDriveInfo[] GetDrives ()
{
// throws IOException, UnauthorizedAccessException (no permission)
ArrayList entries = new ArrayList ();
lock (Native.Syscall.fstab_lock) {
int r = Native.Syscall.setfsent ();
if (r != 1)
throw new IOException ("Error calling setfsent(3)", new UnixIOException ());
try {
Native.Fstab fs;
while ((fs = Native.Syscall.getfsent()) != null) {
// avoid virtual entries, such as "swap"
if (fs.fs_file.StartsWith ("/"))
entries.Add (new UnixDriveInfo (fs));
}
}
finally {
Native.Syscall.endfsent ();
}
}
return (UnixDriveInfo[]) entries.ToArray (typeof(UnixDriveInfo));
}
public override string ToString ()
{
return VolumeLabel;
}
private void Refresh ()
{
Refresh (true);
}
private bool Refresh (bool throwException)
{
int r = Native.Syscall.statvfs (fstab.fs_file, out stat);
if (r == -1 && throwException) {
Native.Errno e = Native.Syscall.GetLastError ();
throw new InvalidOperationException (
UnixMarshal.GetErrorDescription (e),
new UnixIOException (e));
}
else if (r == -1)
return false;
return true;
}
}
}
// vim: noexpandtab
|
