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//
// Mono.Unix/UnixStream.cs
//
// Authors:
// Jonathan Pryor (jonpryor@vt.edu)
//
// (C) 2004-2006 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.IO;
using System.Runtime.InteropServices;
using System.Text;
using Mono.Unix;
namespace Mono.Unix {
public sealed class UnixStream : Stream, IDisposable
{
public const int InvalidFileDescriptor = -1;
public const int StandardInputFileDescriptor = 0;
public const int StandardOutputFileDescriptor = 1;
public const int StandardErrorFileDescriptor = 2;
public UnixStream (int fileDescriptor)
: this (fileDescriptor, true) {}
public UnixStream (int fileDescriptor, bool ownsHandle)
{
if (InvalidFileDescriptor == fileDescriptor)
throw new ArgumentException (Locale.GetText ("Invalid file descriptor"), "fileDescriptor");
this.fileDescriptor = fileDescriptor;
this.owner = ownsHandle;
long offset = Native.Syscall.lseek (fileDescriptor, 0, Native.SeekFlags.SEEK_CUR);
if (offset != -1)
canSeek = true;
long read = Native.Syscall.read (fileDescriptor, IntPtr.Zero, 0);
if (read != -1)
canRead = true;
long write = Native.Syscall.write (fileDescriptor, IntPtr.Zero, 0);
if (write != -1)
canWrite = true;
}
private void AssertNotDisposed ()
{
if (fileDescriptor == InvalidFileDescriptor)
throw new ObjectDisposedException ("Invalid File Descriptor");
}
public int Handle {
get {return fileDescriptor;}
}
public override bool CanRead {
get {return canRead;}
}
public override bool CanSeek {
get {return canSeek;}
}
public override bool CanWrite {
get {return canWrite;}
}
public override long Length {
get {
AssertNotDisposed ();
if (!CanSeek)
throw new NotSupportedException ("File descriptor doesn't support seeking");
RefreshStat ();
return stat.st_size;
}
}
public override long Position {
get {
AssertNotDisposed ();
if (!CanSeek)
throw new NotSupportedException ("The stream does not support seeking");
long pos = Native.Syscall.lseek (fileDescriptor, 0, Native.SeekFlags.SEEK_CUR);
if (pos == -1)
UnixMarshal.ThrowExceptionForLastError ();
return (long) pos;
}
set {
Seek (value, SeekOrigin.Begin);
}
}
[CLSCompliant (false)]
public Native.FilePermissions Protection {
get {
RefreshStat ();
return stat.st_mode;
}
set {
// we can't change file type with fchmod, so clear out that portion
value &= ~Native.FilePermissions.S_IFMT;
int r = Native.Syscall.fchmod (fileDescriptor, value);
UnixMarshal.ThrowExceptionForLastErrorIf (r);
}
}
public FileTypes FileType {
get {
int type = (int) Protection;
return (FileTypes) (type & (int) UnixFileSystemInfo.AllFileTypes);
}
// no set as fchmod(2) won't accept changing the file type.
}
public FileAccessPermissions FileAccessPermissions {
get {
int perms = (int) Protection;
return (FileAccessPermissions) (perms & (int) FileAccessPermissions.AllPermissions);
}
set {
int perms = (int) Protection;
perms &= (int) ~FileAccessPermissions.AllPermissions;
perms |= (int) value;
Protection = (Native.FilePermissions) perms;
}
}
public FileSpecialAttributes FileSpecialAttributes {
get {
int attrs = (int) Protection;
return (FileSpecialAttributes) (attrs & (int) UnixFileSystemInfo.AllSpecialAttributes);
}
set {
int perms = (int) Protection;
perms &= (int) ~UnixFileSystemInfo.AllSpecialAttributes;
perms |= (int) value;
Protection = (Native.FilePermissions) perms;
}
}
public UnixUserInfo OwnerUser {
get {RefreshStat (); return new UnixUserInfo (stat.st_uid);}
}
public long OwnerUserId {
get {RefreshStat (); return stat.st_uid;}
}
public UnixGroupInfo OwnerGroup {
get {RefreshStat (); return new UnixGroupInfo (stat.st_gid);}
}
public long OwnerGroupId {
get {RefreshStat (); return stat.st_gid;}
}
private void RefreshStat ()
{
int r = Native.Syscall.fstat (fileDescriptor, out stat);
UnixMarshal.ThrowExceptionForLastErrorIf (r);
}
public void AdviseFileAccessPattern (FileAccessPattern pattern, long offset, long len)
{
FileHandleOperations.AdviseFileAccessPattern (fileDescriptor, pattern, offset, len);
}
public void AdviseFileAccessPattern (FileAccessPattern pattern)
{
AdviseFileAccessPattern (pattern, 0, 0);
}
public override void Flush ()
{
int r = Native.Syscall.fsync (fileDescriptor);
if (r == -1) {
Native.Errno e = Native.Stdlib.GetLastError ();
// From the man page:
// EROFS, EINVAL:
// fd is bound to a special file which does not support
// synchronization.
// Sockets are such a file, and since Close() calls Flush(), and we
// want to support manually opened sockets, we shouldn't generate an
// exception for these errors.
if (e == Native.Errno.EROFS || e == Native.Errno.EINVAL) {
return;
}
UnixMarshal.ThrowExceptionForError (e);
}
}
public override unsafe int Read ([In, Out] byte[] buffer, int offset, int count)
{
AssertNotDisposed ();
AssertValidBuffer (buffer, offset, count);
if (!CanRead)
throw new NotSupportedException ("Stream does not support reading");
long r = 0;
fixed (byte* buf = &buffer[offset]) {
do {
r = Native.Syscall.read (fileDescriptor, buf, (ulong) count);
} while (UnixMarshal.ShouldRetrySyscall ((int) r));
}
if (r == -1)
UnixMarshal.ThrowExceptionForLastError ();
return (int) r;
}
private void AssertValidBuffer (byte[] buffer, int offset, int count)
{
if (buffer == null)
throw new ArgumentNullException ("buffer");
if (offset < 0)
throw new ArgumentOutOfRangeException ("offset", "< 0");
if (count < 0)
throw new ArgumentOutOfRangeException ("count", "< 0");
if (offset > buffer.Length)
throw new ArgumentException ("destination offset is beyond array size");
if (offset > (buffer.Length - count))
throw new ArgumentException ("would overrun buffer");
}
public unsafe int ReadAtOffset ([In, Out] byte[] buffer,
int offset, int count, long fileOffset)
{
AssertNotDisposed ();
AssertValidBuffer (buffer, offset, count);
if (!CanRead)
throw new NotSupportedException ("Stream does not support reading");
long r = 0;
fixed (byte* buf = &buffer[offset]) {
do {
r = Native.Syscall.pread (fileDescriptor, buf, (ulong) count, fileOffset);
} while (UnixMarshal.ShouldRetrySyscall ((int) r));
}
if (r == -1)
UnixMarshal.ThrowExceptionForLastError ();
return (int) r;
}
public override long Seek (long offset, SeekOrigin origin)
{
AssertNotDisposed ();
if (!CanSeek)
throw new NotSupportedException ("The File Descriptor does not support seeking");
if (offset > int.MaxValue)
throw new ArgumentOutOfRangeException ("offset", "too large");
Native.SeekFlags sf = Native.SeekFlags.SEEK_CUR;
switch (origin) {
case SeekOrigin.Begin: sf = Native.SeekFlags.SEEK_SET; break;
case SeekOrigin.Current: sf = Native.SeekFlags.SEEK_CUR; break;
case SeekOrigin.End: sf = Native.SeekFlags.SEEK_END; break;
}
long pos = Native.Syscall.lseek (fileDescriptor, offset, sf);
if (pos == -1)
UnixMarshal.ThrowExceptionForLastError ();
return (long) pos;
}
public override void SetLength (long value)
{
AssertNotDisposed ();
if (value < 0)
throw new ArgumentOutOfRangeException ("value", "< 0");
if (!CanSeek && !CanWrite)
throw new NotSupportedException ("You can't truncating the current file descriptor");
int r;
do {
r = Native.Syscall.ftruncate (fileDescriptor, value);
} while (UnixMarshal.ShouldRetrySyscall (r));
UnixMarshal.ThrowExceptionForLastErrorIf (r);
}
public override unsafe void Write (byte[] buffer, int offset, int count)
{
AssertNotDisposed ();
AssertValidBuffer (buffer, offset, count);
if (!CanWrite)
throw new NotSupportedException ("File Descriptor does not support writing");
long r = 0;
fixed (byte* buf = &buffer[offset]) {
do {
r = Native.Syscall.write (fileDescriptor, buf, (ulong) count);
} while (UnixMarshal.ShouldRetrySyscall ((int) r));
}
if (r == -1)
UnixMarshal.ThrowExceptionForLastError ();
}
public unsafe void WriteAtOffset (byte[] buffer,
int offset, int count, long fileOffset)
{
AssertNotDisposed ();
AssertValidBuffer (buffer, offset, count);
if (!CanWrite)
throw new NotSupportedException ("File Descriptor does not support writing");
long r = 0;
fixed (byte* buf = &buffer[offset]) {
do {
r = Native.Syscall.pwrite (fileDescriptor, buf, (ulong) count, fileOffset);
} while (UnixMarshal.ShouldRetrySyscall ((int) r));
}
if (r == -1)
UnixMarshal.ThrowExceptionForLastError ();
}
public void SendTo (UnixStream output)
{
SendTo (output, (ulong) output.Length);
}
[CLSCompliant (false)]
public void SendTo (UnixStream output, ulong count)
{
SendTo (output.Handle, count);
}
[CLSCompliant (false)]
public void SendTo (int out_fd, ulong count)
{
if (!CanWrite)
throw new NotSupportedException ("Unable to write to the current file descriptor");
long offset = Position;
long r = Native.Syscall.sendfile (out_fd, fileDescriptor, ref offset, count);
if (r == -1)
UnixMarshal.ThrowExceptionForLastError ();
}
public void SetOwner (long user, long group)
{
AssertNotDisposed ();
int r = Native.Syscall.fchown (fileDescriptor,
Convert.ToUInt32 (user), Convert.ToUInt32 (group));
UnixMarshal.ThrowExceptionForLastErrorIf (r);
}
public void SetOwner (string user, string group)
{
AssertNotDisposed ();
long uid = new UnixUserInfo (user).UserId;
long gid = new UnixGroupInfo (group).GroupId;
SetOwner (uid, gid);
}
public void SetOwner (string user)
{
AssertNotDisposed ();
Native.Passwd pw = Native.Syscall.getpwnam (user);
if (pw == null)
throw new ArgumentException (Locale.GetText ("invalid username"), "user");
long uid = pw.pw_uid;
long gid = pw.pw_gid;
SetOwner (uid, gid);
}
[CLSCompliant (false)]
public long GetConfigurationValue (Native.PathconfName name)
{
AssertNotDisposed ();
long r = Native.Syscall.fpathconf (fileDescriptor, name);
if (r == -1 && Native.Syscall.GetLastError() != (Native.Errno) 0)
UnixMarshal.ThrowExceptionForLastError ();
return r;
}
~UnixStream ()
{
Close ();
}
public override void Close ()
{
if (fileDescriptor == InvalidFileDescriptor)
return;
Flush ();
int r;
do {
r = Native.Syscall.close (fileDescriptor);
} while (UnixMarshal.ShouldRetrySyscall (r));
UnixMarshal.ThrowExceptionForLastErrorIf (r);
fileDescriptor = InvalidFileDescriptor;
GC.SuppressFinalize (this);
}
void IDisposable.Dispose ()
{
AssertNotDisposed ();
if (owner) {
Close ();
}
GC.SuppressFinalize (this);
}
private bool canSeek = false;
private bool canRead = false;
private bool canWrite = false;
private bool owner = true;
private int fileDescriptor = InvalidFileDescriptor;
private Native.Stat stat;
}
}
// vim: noexpandtab
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