Structs§
- Descriptor
Handle  - A handle for a file descriptor.
 - Descriptor
Handle Error  - The handle is not valid.
 - Descriptor
Table  - Map of file handles to file descriptors. Typically owned by a
Thread. 
Constants§
- FD_MAX
 - POSIX requires fds to be assigned as 
libc::c_int, so we can’t allow any fds larger than this.