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using Ryujinx.HLE.HOS.Services.Sockets.Bsd.Types;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Numerics;
namespace Ryujinx.HLE.HOS.Services.Sockets.Bsd
{
class BsdContext
{
private static readonly ConcurrentDictionary<ulong, BsdContext> _registry = new();
private readonly object _lock = new();
private readonly List<IFileDescriptor> _fds;
private BsdContext()
{
_fds = new List<IFileDescriptor>();
}
public ISocket RetrieveSocket(int socketFd)
{
IFileDescriptor file = RetrieveFileDescriptor(socketFd);
if (file is ISocket socket)
{
return socket;
}
return null;
}
public IFileDescriptor RetrieveFileDescriptor(int fd)
{
lock (_lock)
{
if (fd >= 0 && _fds.Count > fd)
{
return _fds[fd];
}
}
return null;
}
public List<IFileDescriptor> RetrieveFileDescriptorsFromMask(ReadOnlySpan<byte> mask)
{
List<IFileDescriptor> fds = new();
for (int i = 0; i < mask.Length; i++)
{
byte current = mask[i];
while (current != 0)
{
int bit = BitOperations.TrailingZeroCount(current);
current &= (byte)~(1 << bit);
int fd = i * 8 + bit;
fds.Add(RetrieveFileDescriptor(fd));
}
}
return fds;
}
public int RegisterFileDescriptor(IFileDescriptor file)
{
lock (_lock)
{
for (int fd = 0; fd < _fds.Count; fd++)
{
if (_fds[fd] == null)
{
_fds[fd] = file;
return fd;
}
}
_fds.Add(file);
return _fds.Count - 1;
}
}
public void BuildMask(List<IFileDescriptor> fds, Span<byte> mask)
{
foreach (IFileDescriptor descriptor in fds)
{
int fd = _fds.IndexOf(descriptor);
mask[fd >> 3] |= (byte)(1 << (fd & 7));
}
}
public int DuplicateFileDescriptor(int fd)
{
IFileDescriptor oldFile = RetrieveFileDescriptor(fd);
if (oldFile != null)
{
lock (_lock)
{
oldFile.Refcount++;
return RegisterFileDescriptor(oldFile);
}
}
return -1;
}
public bool CloseFileDescriptor(int fd)
{
IFileDescriptor file = RetrieveFileDescriptor(fd);
if (file != null)
{
file.Refcount--;
if (file.Refcount <= 0)
{
file.Dispose();
}
lock (_lock)
{
_fds[fd] = null;
}
return true;
}
return false;
}
public LinuxError ShutdownAllSockets(BsdSocketShutdownFlags how)
{
lock (_lock)
{
foreach (IFileDescriptor file in _fds)
{
if (file is ISocket socket)
{
LinuxError errno = socket.Shutdown(how);
if (errno != LinuxError.SUCCESS)
{
return errno;
}
}
}
}
return LinuxError.SUCCESS;
}
public static BsdContext GetOrRegister(ulong processId)
{
BsdContext context = GetContext(processId);
if (context == null)
{
context = new BsdContext();
_registry.TryAdd(processId, context);
}
return context;
}
public static BsdContext GetContext(ulong processId)
{
if (!_registry.TryGetValue(processId, out BsdContext processContext))
{
return null;
}
return processContext;
}
}
}
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