GLibPollFD

struct GPollFD {
  gint fd;
  gushort events;
  gushort revents;
}

Represents a file descriptor, which events to poll for, and which events occurred.

`fd`	The file descriptor to poll (or a HANDLE on Win32)
`events`	A bitwise combination from `GIOCondition`, specifying which events should be polled for. Typically for reading from a file descriptor you would use `G_IO_IN` \| `G_IO_HUP` \| `G_IO_ERR`, and for writing you would use `G_IO_OUT` \| `G_IO_ERR`.
`revents`	A bitwise combination of flags from `GIOCondition`, returned from the `poll()` function to indicate which events occurred.