/// <summary>
/// Starts a new process based on the given path and arguments
/// </summary>
/// <param name="path">The path</param>
/// <param name="argv">The arguments</param>
/// <param name="flags">Spawn flags</param>
/// <returns>Errorcode or PID</returns>
public static int StartProcess(string path, string[] argv, Task.SpawnFlags flags)
{
if (argv == null)
{
Panic.DoPanic("argv == null");
}
Node node = VFS.GetByAbsolutePath(path);
if (node == null)
{
return(-(int)ErrorCode.ENOENT);
}
// Open and create buffer
VFS.Open(node, (int)FileMode.O_RDONLY);
byte[] buffer = new byte[node.Size];
if (buffer == null)
{
Heap.Free(node);
VFS.Close(node);
return(-(int)ErrorCode.ENOMEM);
}
// Fill buffer contents
VFS.Read(node, 0, node.Size, buffer);
VFS.Close(node);
// Pass execution to ELF loader
int status = ELFLoader.Execute(buffer, node.Size, argv, flags);
Heap.Free(buffer);
Heap.Free(node);
return(status);
}
/// <summary>
/// Cleans up the file descriptors
/// </summary>
public void Cleanup()
{
for (int i = 0; i < Used; i++)
{
Node node = GetNode(i);
if (node == null)
{
continue;
}
VFS.Close(node);
Heap.Free(node);
}
}
/// <summary>
/// Closes a node
/// </summary>
/// <param name="descriptor">The file descriptor</param>
/// <returns>The errorcode</returns>
public int Close(int descriptor)
{
Node node = GetNode(descriptor);
if (node == null)
{
return(-(int)ErrorCode.EBADF);
}
VFS.Close(node);
Nodes[descriptor] = null;
Used--;
return(0);
}
/// <summary>
/// Replaces an old file descriptor with a new one
/// </summary>
/// <param name="oldfd">The old file descriptor</param>
/// <param name="newfd">The new file descriptor</param>
/// <returns>The new file descriptor, or an errorcode</returns>
public int Dup2(int oldfd, int newfd)
{
if (oldfd < 0 || newfd < 0 || oldfd >= Capacity || newfd >= Capacity)
{
return(-(int)ErrorCode.EBADF);
}
// If there is an old file descriptor node, close it
Node old = GetNode(oldfd);
if (old != null)
{
VFS.Close(old);
}
// Clone the new one, replacing the old one
Nodes[oldfd] = Nodes[newfd].Clone();
return(newfd);
}